U.S. patent application number 15/068914 was filed with the patent office on 2016-09-01 for oral care compositions with a reduced bitter taste perception.
The applicant listed for this patent is The Procter & Gamble Company. Invention is credited to John Christian Haught, Yakang Lin, Koti Sreekrishna.
Application Number | 20160250122 15/068914 |
Document ID | / |
Family ID | 52669677 |
Filed Date | 2016-09-01 |
United States Patent
Application |
20160250122 |
Kind Code |
A1 |
Lin; Yakang ; et
al. |
September 1, 2016 |
Oral Care Compositions With A Reduced Bitter Taste Perception
Abstract
An oral care composition with reduced bitterness containing
polyquaternium-2, polyquaternium-17, and/or polyquaternium-18.
Inventors: |
Lin; Yakang; (Liberty
Township, OH) ; Sreekrishna; Koti; (Mason, OH)
; Haught; John Christian; (West Chester, OH) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
The Procter & Gamble Company |
Cincinnati |
OH |
US |
|
|
Family ID: |
52669677 |
Appl. No.: |
15/068914 |
Filed: |
March 14, 2016 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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14633163 |
Feb 27, 2015 |
9314419 |
|
|
15068914 |
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Current U.S.
Class: |
424/52 |
Current CPC
Class: |
A61Q 11/00 20130101;
A61K 8/27 20130101; A61K 8/21 20130101; A61K 2800/592 20130101;
A61K 2800/5426 20130101; A61K 8/463 20130101; A61K 8/416 20130101;
A61K 8/362 20130101; A61K 8/4926 20130101; A61K 8/29 20130101; A61K
8/84 20130101 |
International
Class: |
A61K 8/41 20060101
A61K008/41; A61Q 11/00 20060101 A61Q011/00 |
Claims
1. An oral care composition with reduced bitterness comprising: a.
a polyquaternium selected from the group consisting of
polyquaternium-2, polyquaternium-17, polyquaternium-18, and
combinations thereof; b. a bitter agent wherein the bitter agent is
selected from the group consisting of a metal salt, an
antimicrobial agent, a solvent, and combinations thereof.
2. The oral care composition of claim 1 wherein the bitter agent is
the antimicrobial agent selected from the group consisting of cetyl
pyridinium chloride, hops, zinc salt, peroxide, and combinations
thereof.
3. The oral care composition of claim 2, wherein the antimicrobial
agent is the zinc salt selected from the group consisting zinc
chloride, zinc citrate, zinc oxide, zinc oxalate, zinc gluconate,
zinc lactate, and combinations thereof.
4. The oral care composition of claim 1 wherein the bitter agent is
the solvent selected from the group consisting of propylene glycol,
sorbitol, glycerin, xylitol, and combinations thereof.
5. The oral care composition of claim 1 wherein the oral care
composition is selected from the group consisting of dentifrice,
mouthwash, whitening gel, denture cream, and combinations
thereof.
6. The oral care composition of claim 1 further comprising a
surfactant wherein the surfactant is selected from the group
consisting of sodium lauryl sulfate, cocoamidylpropyl betaine,
alkyl phosphates, and combinations thereof.
7. The oral care composition of claim 1 wherein an overall
bitterness is reduced by at least about 25% as compared to an
identical composition without the polyquaternium as determined by
the in vitro Assay for Taste Receptors.
8. The oral care composition of claim 1 wherein an overall
bitterness is less than about 6000 fluorescence units as determined
by the in vitro Assay for Taste Receptors.
9. The oral care composition of claim 1 comprising from about 0.01%
to about 1% polyquaternium.
10. The oral care composition of claim 1 comprising from about
0.05% to about 11% metal salt.
11. The oral care composition of claim 1 comprising from about
0.045% to about 1.0% antimicrobial agent.
12. An oral care composition with reduced bitterness comprising: a
polyquaternium selected from the group consisting of
polyquaternium-2, polyquaternium-17, polyquaternium-18, and
combinations thereof; wherein the oral care composition is a
dentifrice.
13. The oral care composition of claim 12 wherein an overall
bitterness is reduced by at least about 30% as compared to an
identical composition without the polyquaternium as determined by
the in vitro Assay for Taste Receptors.
14. The oral care composition of claim 12 wherein an overall
bitterness is less than about 7000 fluorescence units as determined
by the in vitro Assay for Taste Receptors.
15. The oral care composition of claim 12 comprising from about
0.01% to about 1% polyquaternium.
16. The oral care composition of claim 12 wherein the
polyquaternium is polyquaternium-2.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to an oral care composition
comprising a low molecular weight polyquaternium to modulate
bitterness, more particularly a low level of polyquaternium-2,
polyquaternium-17, and/or polyquaternium-18 to modulate
bitterness.
BACKGROUND OF THE INVENTION
[0002] There are five recognized taste sensations, sweet, salty,
sour, bitter, and umami. Many people dislike things that are overly
bitter and perceive it is as unpleasant, sharp, or otherwise
disagreeable. Bitterness is the most sensitive of the tastes and it
is thought to be a defense mechanism to protect the body against
ingestion of toxic substances, as a large number of natural bitter
compounds are known to be toxic.
[0003] However some components that are found in oral care
compositions can often have a bitter and astringent taste
associated with them. Specifically, metal salts have a high degree
of astringency and bitterness when delivered from oral care
compositions such as a dentifrice or mouthwash. Furthermore, hops,
which can be used as an antimicrobial in oral care compositions can
also have a bitter taste. Oral care compositions often contain
flavors and sweeteners to mute the bitterness associated with the
actives and excipients. Despite these efforts, many oral care
compositions still possess an unpleasant taste and/or after taste.
This causes some consumers to avoid and/or dislike using oral care
compositions.
[0004] Thus, there is a need for an oral care composition with
reduced bitterness.
SUMMARY OF THE INVENTION
[0005] An oral care composition with reduced bitterness comprising
a polyquaternium selected from the group consisting of
polyquaternium-2, polyquaternium-17, polyquaternium-18, and
combinations thereof.
[0006] An oral care composition with reduced bitterness comprising:
(a) a polyquaternium selected from the group consisting of
polyquaternium-2, polyquaternium-17, polyquaternium-18, and
combinations thereof; (b) a fluoride compound; (c) a metal salt;
wherein the oral care composition is a dentifrice.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] While the specification concludes with claims particularly
pointing out and distinctly claiming the subject matter of the
present invention, it is believed that the invention can be more
readily understood from the following description taken in
connection with the accompanying drawings, in which:
[0008] FIG. 1A shows the molecular structure for
polyquaternium-2;
[0009] FIG. 1B shows the molecular structure for
polyquaternium-17;
[0010] FIG. 1C shows the molecular structure for
polyquaternium-18;
[0011] FIG. 2A compares the modulation of bitterness of solutions
with different water soluble polymers in an Assay for Taste
Receptors;
[0012] FIG. 2B compares the modulation of bitterness of solutions
with different water soluble polymers in an Assay for Taste
Receptors;
[0013] FIG. 2C compares the modulation of bitterness of solutions
with different water soluble polymers and actives in an Assay for
Taste Receptors;
[0014] FIG. 3A compares the modulation of bitterness of different
strains of hops with polyquaternium-2 in an Assay for Taste
Receptors;
[0015] FIG. 3B compares the modulation of bitterness of different
compositions with polyquaternium-2 in an Assay for Taste
Receptors;
[0016] FIG. 4A compares the modulation of bitterness of solutions
containing an active and a concentration of polyquaternium-2 in an
Assay for Taste Receptors;
[0017] FIG. 4B compares the modulation of bitterness of solutions
containing an active and a concentration of polyquaternium-2 in an
Assay for Taste Receptors; and
[0018] FIG. 4C compares the modulation of bitterness of solutions
containing an active and a concentration of polyquaternium-2 in an
Assay for Taste Receptors.
DETAILED DESCRIPTION OF THE INVENTION
[0019] Oral care compositions, particularly mouthwashes, floss,
tooth strips, dentures, and dentifrices, have a bitter and
astringent taste associated with them due to the components, such
as metal salts, binders, thickeners, and antimicrobial agents like,
but not limited to hops, thymol, cetyl pyridinium chloride (CPC),
triclosan, and stannous fluoride It has been surprisingly found
that polyquaternium-2 can significantly modulate the bitterness in
some oral care compositions.
[0020] Several polymers, including other polyquats, were tested in
vitro taste bud cell assays to determine whether they may serve as
a bitter blocker. Polyquaternium-2 modulated the bitterness of
guaifenesin (GG) in the cell assays better than any other polymer,
including the polyquats which have a similar chemical structure.
Polyquaternium-17 and/or polyquaternium-18 are structurally
analogous to polyquaternium-2 and can be used instead of or in
combination with polyquaternium-2. GG, a drug used in
over-the-counter medication, was selected as a compound for
screening bitter blockers because it is known for being
exceptionally bitter and difficult to taste mask with sweeteners
and flavors.
[0021] After polyquaternium-2 was selected as a potential bitter
modifier, different strains of hops were tested in vitro using
taste bud cell assays. Surprisingly, it was found that
polyquaternium-2 reduced the bitterness of hops. Polyquaternium-17
and/or polyquaternium-18 may also reduce the bitterness of
hops.
[0022] All percentages and ratios used hereinafter are by weight of
total composition, unless otherwise indicated. All percentages,
ratios, and levels of ingredients referred to herein are based on
the actual amount of the ingredient, and do not include solvents,
fillers, or other materials with which the ingredient may be
combined as a commercially available product, unless otherwise
indicated.
[0023] All measurements referred to herein are made at 25.degree.
C. (i.e. room temperature) unless otherwise specified.
[0024] The composition can contain, consist of, or consist
essentially of, the essential elements and limitations of the
invention described herein, as well as any additional or optional
ingredients, components, or limitations described herein or
otherwise useful in oral care compositions.
[0025] As used herein, the word "include," and its variants, are
intended to be non-limiting, such that recitation of items in a
list is not to the exclusion of other like items that may also be
useful in the materials, compositions, devices, and methods of this
invention.
[0026] As used herein, the word "or" when used as a connector of
two or more elements is meant to include the elements individually
and in combination; for example X or Y, means X or Y or both.
[0027] By "oral care composition", as used herein, is meant a
product, which in the ordinary course of usage, is not
intentionally swallowed for purposes of systemic administration of
particular therapeutic agents, but is rather retained in the oral
cavity for a time sufficient to contact dental surfaces or oral
tissues. Examples of oral care compositions include dentifrice,
mouth rinse, mousse, foam, mouth spray, lozenge, chewable tablet,
chewing gum, tooth whitening strips, floss and floss coatings,
breath freshening dissolvable strips, or denture care or adhesive
product. The oral care composition may also be incorporated onto
strips or films for direct application or attachment to oral
surfaces.
[0028] The term "dentifrice", as used herein, includes tooth or
subgingival-paste, gel, or liquid formulations unless otherwise
specified. The dentifrice composition may be a single phase
composition or may be a combination of two or more separate
dentifrice compositions. The dentifrice composition may be in any
desired form, such as deep striped, surface striped, multilayered,
having a gel surrounding a paste, or any combination thereof. Each
dentifrice composition in a dentifrice comprising two or more
separate dentifrice compositions may be contained in a physically
separated compartment of a dispenser and dispensed
side-by-side.
[0029] As used herein, the articles "a" and "an" are understood to
mean one or more of the material that is claimed or described, for
example, "an active" or "a solvent".
[0030] The compositions of the present invention can contain,
consist of, or consist essentially of, the essential elements and
limitations of the invention described herein, as well as any
additional or optional ingredients, components, or limitations
described herein or otherwise useful in dosage forms intended for
use or consumption by humans.
[0031] It has been found that polyquaternium-2 can be added to
compositions, particularly oral care compositions to reduce
bitterness. Polyquaternium-2 has the CAS Registry Number 68555-36-2
and the chemical name is Poly[bis(2-chloroethyl)
ether-alt-1,3-bis[3-(dimethylamino)propyl]urea] and is commercially
available as Mirapol.RTM. A 15 (available from Rhodia, Cranbury,
N.J.). The molecular structure for polyquaternium-2 is shown in
FIG. 1A. Polyquaternium-17 (CAS Registry Number 148506-50-7) and
polyquaternium-18 (CAS Registry Number 113784-58-0) are
structurally analogous to polyquaternium-2 and can be used in
addition to or instead of polyquaternium-2 to modulate bitter. The
molecular structure for polyquaternium-17 is shown in FIG. 1B and
the molecular structure for polyquaternium-18 is shown in FIG.
1C.
[0032] FIG. 2A compares the modulation of bitterness of a control
solution comprising 2 mM guaifenesin (GG) with solutions comprising
2 mM GG and one of seven water soluble polymers at concentrations
ranging from 0.33% to 0.01%. The results for FIG. 2 are from an in
vitro Assay for Taste Receptors, as described hereafter. The cell
cultures and assays provide an in vitro method to screen for
bitterness that can mimic an in vivo response.
[0033] The water soluble polymers that were tested were as follows
at concentrations ranging from 0.01% to 0.33%: [0034]
Polyquaternium-6 commercially available as Mirapol.RTM. 100
[CAS#26062-79-3] (available from Rhodia, Cranbery, N.J.) [0035]
Polyquaternium-2 commercially available as Mirapol.RTM. A 15
[CAS#68555-36-2] (available from Rhodia, Cranbury, N.J.) [0036]
Polyquaternium-7 commercially available as Mirapol.RTM. 550
[26590-05-6] (available from Rhodia, Cranbury, N.J.) [0037]
Polyquaternium-7 commercially available as Merquat.TM. 2200
[CAS#26590-05-6] (available from Lubrizol, Deer Park, Tex.) [0038]
Polyquaternium-16 commercially available as Luviquat.RTM. FC550
[CAS#95144-24-4] (available from BASF, Florham Park, N.J.) [0039]
Polyquaternium D16 commercially available as Luviquat.RTM. FC 905
[CAS#95144-24-4] (available from Crescent Company, Islandia, N.Y.)
[0040] Polyquaternium-44 commercially available as Luviquat.RTM.
care polymer [CAS#150599-70-5] (available from BOC Sciences,
Shirley, N.Y.)
[0041] The taste receptors were activated as described in the Assay
for Taste Receptors herein. The observed activation is presented as
a % of the control value. The control value is activation by a 2 mM
GG solution with no added polymers. The results from this assay
showed that only Polyquaternium-2 completely blocked the activation
of taste cell receptors by GG. This is especially surprising, since
GG is one of the most bitter actives used in liquid medications.
Other polymers, including polyquaternium-6 and polyquaternium D16
(Luviquat.RTM. 905) also showed some reduction, however the
modulation was not dose dependent.
[0042] FIG. 2B compares the modulation of bitterness of a solution
comprising 2 mM GG with one of four water soluble polymers at
concentrations ranging from 0.01% to 0.00003%. The four water
soluble polymers were polyquaternium-6 (Mirapol.RTM. 100),
polyquaternium-2 (Mirapol.RTM. A15), polyquaternium D16
(Luviquat.RTM. FC 550), and polyquaternium D16 (Luviquat.RTM. FC
905). The same Assay for Taste Receptor Method described herein and
for FIG. 2 was used to generate the results for FIG. 3A. The lower
concentrations of polymer were selected to help further
differentiate the potential ability for the polymers to provide
bitter blocking in vivo.
[0043] Again, polyquaternium-2 provided the greatest reduction in
bitterness of the 2 mM GG solution. At 0.01%, the bitterness was
reduced to less than 20% of the bitterness of the control.
Furthermore, polyquaternium-2 was the only composition that showed
dose dependent blocking.
[0044] FIG. 2C compares the modulation of bitterness of a solutions
containing different substances that are known to be bitter with
0.17% polyquaternium-2 (Mirapol.RTM. A 15), polyquaternium-7
(Merquat.TM. 2200), and polyquaternium-44 (Luviquat.RTM. Care
Polymer). The Assay for Taste Receptor Method described herein and
was used to generate the results for FIG. 2C. The substances that
were tested were 1 mM clofedanol, 1 mM diphenhydramine, 1 mM GG, 1
mM naproxen, 1 mM ibuprofen, 1 mM quinine, 0.1 mM thymol, 100 .mu.M
AITC (Allyl Isothiocyanate), 100 .mu.M APB (2-Aminoethoxydiphenyl
borate), 100 .mu.M carvacrol, and 10 .mu.M ionomycin was used as
the control.
[0045] Surprisingly, the polyquaternium-2 blocked all but three of
the known bitter molecules, whereas the higher molecular weight
polyquats, polyquaternium-7, and polyquaternium-44, did not show
bitter blocking. Instead the polyquaternium-7, and
polyquaternium-44 caused an increase in the bitter response
relative to each bitter molecule, as shown by the higher
fluorescence units (FUs).
[0046] Since polyquaternium-2 was effective in blocking the
bitterness in the Assay for Taste Receptors, it was desirable to
understand if polyquaternium-2 was effective against other bitter
agents. As shown in FIGS. 3A and 3B, it was found that
polyquaternium-2 was also effective at blocking bitterness from
hops, propylene glycol, and saccharin in the Assay for Taste
Receptors.
[0047] FIG. 3A compares the modulation of bitterness of solutions
containing a strain of hops at different concentrations ranging
from 0.000047% to 0.000374%. Each strain of hops was tested with
the addition of 0.01% polyquaternium-2. The following strains of
hops were tested: B-BL168003, CB-RS5698A-L, CB-RS5722B, and
CB-RS5698A-s. All strains of hops used in this example are
commercially available from available from Hopsteiner.RTM., Yakima,
Wash. 2 mM GG was used as a control to make sure that the bitter
cells were registering bitterness. The results for FIG. 3A are from
an in vitro Assay for Taste Receptors as described hereafter.
[0048] Surprisingly, as seen in FIG. 3A, 0.01% polyquaternium-2
significantly reduces the bitterness of all four strains of hops.
At many concentrations and strains, the bitterness was not
detectable by the bitter cells, which could mimic an in vivo
response.
[0049] FIG. 3B compares the modulation of bitterness, if any, of
solutions containing a composition and 0.01% polyquaternium-2 in
the in vitro Assay for Taste Receptors as described hereafter. The
compositions tested were 0.5 mM saccharin, 3% propylene glycol, and
2 mM GG was used as the control. Surprisingly, polyquaternium-2
completely blocked the bitterness from saccharin and substantially
reduced the bitterness of both propylene glycol.
[0050] In one example, the oral care composition can contain from
about 0.0001% to about 5% hops, in another example from about
0.001% to about 2.5%, in another example from about 0.01% to about
1%, in another example from about 0.05% to about 0.5%, and in
another example from about 0.1% to about 0.2%. The composition can
contain alpha hops and/or beta hops.
[0051] In one example polyquaternium-2, polyquaternium-17, and/or
polyquaternium-18 reduces the overall bitterness of a composition
by at least about 5% as compared to an identical composition
without the polyquaternium-2, polyquaternium-17, and/or
polyquaternium-18 as determined by the in vitro Assay for Taste
Receptors as described hereafter, in another example by at least
about 10%, in another example by at least about 20%, in another
example by at least about 30%, in another example by at least about
40%, in another example by at least about 50%, in another example
by at least about 60%, in another example by at least about 65%, in
another example by at least about 70%, in another example by at
least about 75%, in another example by at least about 80%, in
another example by at least about 85%, in another example by at
least about 90%, in another example at least about 93%, in another
example at least about 95%, in another example by at least about
97%, in another example by at least about 98%, in another example
by at least about 99% and in another example by at least about
100%.
[0052] In another example, polyquaternium-2, polyquaternium-17,
and/or polyquaternium-18 can reduce the overall bitterness of a
composition as compared to an identical composition without the
polyquaternium-2, polyquaternium-17, and/or polyquaternium-18 as
determined by the in vitro Assay for Taste Receptors as described
hereafter.
[0053] In another example, the composition can have an overall
bitterness of less than about 8000 fluorescence units (FUs) as
determined by the in vitro Assay for Taste Receptors as described
hereafter, in another example less than about 7500 FUs, in another
example less than about 70000 FUs, in another example less than
about 6500 FUs, in another example less than about 6000 FUs, in
another example less than about 5500 FUs, in another example less
than about 5000 FUs, in another example less than about 4500 FUs,
in another example less than about 4000 FUs, in another example
less than about 3500 FUs, in another example less than about 3000
FUs, in another example less than about 2500 FUs, in another
example less than about 2000 FUs, in another example less than
about 1500 FUs, in another example less than about 1000 FUs, in
another example less than about 750 FUs, in another example less
than about 500 FUs, in another example less than about 350 FUs, in
another example less than about 300 FUs, in another example less
than about 250 FUs, in another example less than about 200 FUs, in
another example less than about 150 FUs, in another example less
than about 100 FUs, and in another example less than about 50
FUs.
[0054] However, it has been surprisingly discovered that
polyquaternium-2 does not modulate the bitterness for all compounds
that are known to be bitter. For instance, FIGS. 4A, 4B, and 4C
compare the modulation of bitterness, if any, of solutions
containing an active and a concentration of polyquaternium-2. The
concentration of polyquaternium-2 ranges from 0.00041% to 0.1%. GG
at a concentration of 2 mM without polyquaternium-2 is used as a
control. The actives were selected because they are frequently used
in medications and are known to be bitter. The results for FIGS.
4A, 4B, and 4C are from an in vitro Assay for Taste Receptors as
described hereafter.
[0055] FIG. 5A compares the modulation of bitterness, if any, of
solutions comprising 250 .mu.M active and a concentration of
polyquaternium-2. The actives in FIG. 4A are dicyclomine,
hydroxyzine, promethazine, doxepin, and 2 mM GG. FIG. 5A shows that
polyquaternium-2 has at best a very weak bitter blocking activity
on dicyclomine, hydroxyzine, promethazine, and doxepin. However,
FIG. 4A does not show a dose dependent effect and thus
polyquaternium-2 is probably not a specific blocker of these
compositions.
[0056] The actives in FIG. 5B are 1 mM diltiazem, 2 mM phenytoin,
and 1 mM diphenhydramine Polyquaternium-2 blocked some of the
bitterness of diltiazem, but it doesn't show a dose dependent
effect and thus polyquaternium-2 is probably not a specific blocker
for diltiazem. Polyquaternium-2 strongly blocked the bitterness
from phenytoin and omeprazole and polyquaternium-2 had little or no
effect on diphenydramine.
[0057] The actives tested in FIG. 4C included 1 mM cetirizine, 1 mM
enalapril, 0.25% jambu (Acmella oleracea) extract (commercially
available as Jambu SE WS from Naturex.TM., South Hackensack, N.J.),
and 10 mM acetaminophen (APAP). Polyquaternium-2 blocked some of
the bitterness of cetirizine. Polyquaternium-2 did not show a dose
dependent bitter blocking of enalapril. However, polyquaternium-2
shows a strong dose dependent effect on blocking jambu and
APAP.
[0058] Polyquaternium-2, polyquaternium-17, and/or
polyquaternium-18 can be added to compositions, in particular oral
care compositions. In one example, the composition contains from
about 0.01% to about 1% polyquaternium-2, polyquaternium-17, and/or
polyquaternium-18, in another example from about 0.03% to about
0.3%, in another example from about 0.05% to about 0.2%, in another
example from about 0.07% to about 0.15%, in another example from
about 0.08% to about 0.13%, and in another example from about 0.09%
to about 0.11. In one example, the composition can contain about
0.1% polyquaternium-2, polyquaternium-17, and/or polyquaternium-18.
In another example, the composition can contain less than about 1%
polyquaternium-2, polyquaternium-17, and/or polyquaternium-18, in
another example less than about 0.5%, in another example less than
about 0.3%, in another example less than about 0.2%, in another
example less than about 0.15%, and in another example less than
about 0.12%.
[0059] In one example, polyquaternium-2, polyquaternium-17, and/or
polyquaternium-18 can be added to the oral care composition. For
instance, the dentifrice or mouthwash can contain polyquaternium-2,
polyquaternium-17, and/or polyquaternium-18. In another example,
polyquaternium-2, polyquaternium-17, and/or polyquaternium-18 can
be simultaneously with the oral care composition. In another
example, polyquaternium-2, polyquaternium-17, and/or
polyquaternium-18 can be administered before the oral care
composition. In one example the polyquaternium-2,
polyquaternium-17, and/or polyquaternium-18 can be administered
immediately before the oral care composition and in one example the
polyquaternium-2, polyquaternium-17, and/or polyquaternium-18 can
be administered and then a period of time can pass before using the
oral care composition.
[0060] In one example, polyquaternium-2, polyquaternium-17, and/or
polyquaternium-18 can be added to an oral care composition intended
for use by children. Children can be especially sensitive to bitter
tastes and adding polyquaternium-2, polyquaternium-17, and/or
polyquaternium-18 can make bitter compositions, more palatable,
especially to children.
[0061] Actives and other ingredients may be categorized or
described herein by their cosmetic benefit, therapeutic benefit, or
their postulated mode of action or function. However, it is to be
understood that the active and other ingredients useful herein can,
in some instances, provide more than one cosmetic benefit,
therapeutic benefit, function, or can operate via more than one
mode of action. Therefore, classifications herein are made for the
sake of convenience and are not intended to limit an ingredient to
the particularly stated function(s) or activities listed.
[0062] A metal salt includes zinc salts, stannous salts, potassium
salts, copper salts, alkali metal bicarbonate slats, and
combinations thereof. Metal salts have a wide range of functions
from antimicrobial agents to sensitivity agents or buffers. The
oral care compositions of the present invention may contain metal
salt in an amount from about 0.05% to about 11%, from about 0.5% to
about 7%, or from about 1% to about 5%, by total weight of the oral
care composition.
[0063] It is common to have a fluoride compound present in
dentifrices and other oral care compositions in an amount
sufficient to give a fluoride ion concentration in the composition
of from about 0.0025% to about 5.0% or from about 0.005% to about
2.0%, by weight of the oral care composition to provide anticaries
effectiveness. A wide variety of fluoride ion-yielding materials
can be employed as sources of soluble fluoride in the present
invention. Representative fluoride ion sources include: stannous
fluoride, sodium fluoride, potassium fluoride, amine fluoride,
sodium monofluorophosphate, indium fluoride, amine fluorides such
as Olaflur, and many others. Examples of suitable fluoride
ion-yielding materials are found in U.S. Pat. No. 3,535,421 to
Briner et al. and U.S. Pat. No. 3,678,154 to Widder et al.
[0064] Stannous salts include stannous fluoride, stannous chloride,
stannous iodide, stannous chlorofluoride, stannous actetate,
stannous hexafluorozirconate, stannous sulfate, stannous lactate,
stannous tartrate, stannous gluconate, stannous citrate, stannous
malate, stannous glycinate, stannous pyrophosphate, stannous
metaphosphate, stannous oxalate, stannous phosphate, stannous
carbonate, and combinations thereof. Dentifrices containing
stannous salts, particularly stannous fluoride and stannous
chloride, are described in U.S. Pat. No. 5,004,597 to Majeti et al.
Other descriptions of stannous salts are found in U.S. Pat. No.
5,578,293 issued to Prencipe et al. and in U.S. Pat. No. 5,281,410
issued to Lukacovic et al. In addition to the stannous ion source,
other ingredients used to stabilize the stannous may be included,
such as the ingredients described in Majeti et al. and Prencipe et
al.
[0065] Zinc salts include zinc fluoride, zinc chloride, zinc
iodide, zinc chlorofluoride, zinc actetate, zinc
hexafluorozirconate, zinc sulfate, zinc lactate, zinc tartrate,
zinc gluconate, zinc citrate, zinc malate, zinc glycinate, zinc
pyrophosphate, zinc metaphosphate, zinc oxalate, zinc phosphate,
zinc carbonate, and combinations thereof.
[0066] Potassium salts include potassium nitrate, potassium
citrate, potassium oxalate, potassium bicarbonate, potassium
acetate, potassium chloride, and combinations thereof.
[0067] In one example, the copper salt can be selected from copper
fluoride, copper chloride, copper iodide, copper chlorofluoride,
copper actetate, copper hexafluorozirconate, copper sulfate, copper
lactate, copper tartrate, copper gluconate, copper citrate, copper
malate, copper glycinate, copper pyrophosphate, copper
metaphosphate, copper oxalate, copper phosphate, copper carbonate,
and combinations thereof. In a further example, the copper salt can
be selected from copper gluconate, copper acetate, copper
glycinate, and combinations thereof.
[0068] Alkali metal bicarbonate salts are soluble in water and
unless stabilized, tend to release carbon dioxide in an aqueous
system. Sodium bicarbonate, also known as baking soda, can be the
preferred alkali metal bicarbonate salt. The alkali metal
bicarbonate salt also functions as a buffering agent. Because of
the pH at which alkali metal bicarbonate salts buffer, the
bicarbonate salt may be in a phase separate from the stannous ion
source. In certain examples, the oral care composition of the
present invention may contain from about 0.5% to about 50%, from
about 0.5% to about 30%, from about 2% to about 20%, or from about
5% to about 18% of an alkali metal bicarbonate salt, by weight of
the oral care composition.
[0069] Some metal salts which may be used in the present invention,
such as zinc chloride, zinc citrate, copper gluconate, and zinc
gluconate, are also associated with an off taste described as
dirty, dry, earthy, metallic, sour, bitter, and astringent.
[0070] Sweeteners include saccharin, chloro-sucrose (sucralose),
steviolglycosides, rebaudioside A, rebaudioside B, rebaudioside C,
rebaudioside D, rebaudioside E, rebaudioside F, dulcoside A,
dulcoside B, rubusoside, stevia, stevioside, acesulfame K, xylitol,
neohesperidine DC, alitame, aspartame, neotame, alitame, thaumatin,
cyclamate, glycyrrhizin, mogroside IV, mogroside V, Luo Han Guo
sweetener, siamenoside, monatin and its salts (monatin SS, RR, RS,
SR), curculin, monellin, mabinlin, brazzein, hemandulcin,
phyllodulcin, glycyphyllin, phloridzin, trilobatin, baiyanoside,
osladin, polypodoside A, pterocaryoside A, pterocaryoside B,
mukurozioside, phlomisoside I, periandrin I, abrusoside A,
cyclocarioside
I,N-[N-[3-(3-hydroxy-4-methoxyphenyl)propyl]-L-.alpha.-aspartyl]-L-phenyl-
alanine 1-methyl ester,
N-[N-[3-(3-hydroxy-4-methoxyphenyl)-3-methylbutyl]-L-.alpha.-aspartyl]-L--
phenylalanine 1-methyl ester,
N-[N-[3-(3-methoxy-4-hydroxyphenyl)propyl]-L-.alpha.-aspartyl]-L-phenylal-
anine 1-methyl ester, salts thereof, and combinations thereof.
[0071] Rebiana can be a steviolglycoside from Cargill Corp.,
Minneapolis, Minn., which is an extract from the leaves of the
Stevia rebaudiana plant (hereinafter referred to as "Rebiana").
This is a crystalline diterpene glycoside, about 300.times. sweeter
than sucrose. Examples of suitable stevioglycosides which may be
combined include rebaudioside A, rebaudioside B, rebaudioside C,
rebaudioside D, rebaudioside E, rebaudioside F, dulcoside A,
dulcoside B, rubusoside, stevioside, or steviolbioside. According
to particularly desirable examples of the present invention, the
combination of high-potency sweeteners comprises rebaudioside A in
combination with rebaudioside B, rebaudioside C, rebaudioside F,
rebaudioside F, stevioside, steviolbioside, dulcoside A. Sweeteners
are generally included in an oral care composition at a level of
about 0.0005% to about 2%, by total weight of the oral care
composition.
[0072] Carrier materials include water, glycerin, sorbitol,
polyethylene glycols having a molecular weight of less than about
50,000, propylene glycol and other edible polyhydric alcohols,
ethanol, or combinations thereof. The oral care compositions of the
present invention include from about 5% to about 80%, by weight of
the composition, of a carrier material. In certain examples, the
compositions contain carrier materials in an amount of from about
10% to about 40%, by total weight of the oral care composition.
[0073] Antimicrobial agents include quaternary ammonium compounds.
Those useful in the present invention include, for example, those
in which one or two of the substitutes on the quaternary nitrogen
has a carbon chain length (typically alkyl group) from about 8 to
about 20, typically from about 10 to about 18 carbon atoms while
the remaining substitutes (typically alkyl or benzyl group) have a
lower number of carbon atoms, such as from about 1 to about 7
carbon atoms, typically methyl or ethyl groups. Dodecyl trimethyl
ammonium bromide, tetradecylpyridinium chloride, domiphen bromide,
N-tetradecyl-4-ethyl pyridinium chloride, dodecyl dimethyl
(2-phenoxyethyl) ammonium bromide, benzyl dimethoylstearyl ammonium
chloride, quaternized 5-amino-1,3-bis(2-ethyl-hexyl)-5-methyl
hexahydropyrimidine, benzalkonium chloride, benzethonium chloride
and methyl benzethonium chloride are exemplary of typical
quaternary ammonium antibacterial agents.
[0074] Other quaternary ammonium compounds include the pyridinium
compounds. Examples of pyridinium quaternary ammonium compounds
include bis[4-(R-amino)-1-pyridinium] alkanes as disclosed in U.S.
Pat. No. 4,206,215, Jun. 3, 1980, to Bailey and cetylpyridinium and
tetradecylpyridinium halide salts (i.e., chloride, bromide,
fluoride and iodide).
[0075] The oral care compositions of the present invention may also
include other antimicrobial agents including non-cationic
antimicrobial agents such as halogenated diphenyl ethers, phenolic
compounds including phenol and its homologs, mono and poly-alkyl
and aromatic halophenols, resorcinol and its derivatives, xylitol,
bisphenolic compounds and halogenated salicylanilides, benzoic
esters, and halogenated carbanilides. Also useful antimicrobials
are enzymes, including endoglycosidase, papain, dextranase,
mutanase, and combinations thereof. Such agents are disclosed in
U.S. Pat. No. 2,946,725, Jul. 26, 1960, to Norris et al. and in
U.S. Pat. No. 4,051,234 to Gieske et al. Examples of other
antimicrobial agents include chlorhexidine, and flavor oils such as
thymol. In another example, the antimicrobial agent can include
triclosan.
[0076] The compositions of the present invention may contain
antimicrobial agents in an amount of from about 0.035% or more,
from about 0.1% to about 1.5%, from about 0.045% to about 1.0%, or
from about 0.05% to about 0.10%, by total weight of the oral care
composition.
[0077] Bleaching agents can include peroxides, perborates,
percarbonates, peroxyacids, persulfates, and combinations thereof.
Suitable peroxide compounds include hydrogen peroxide, urea
peroxide, calcium peroxide, sodium peroxide, zinc peroxide, or
combinations thereof. One example of a percarbonate is sodium
percarbonate. An example of a persulfate includes oxones. Some
bleaching agents provide a burn sensation within an oral care
composition, for example peroxides and percarbonates.
[0078] The compositions of the present invention may contain
bleaching agents in an amount of from about 0.01% to about 30%,
from about 0.1% to about 10%, or from about 0.5% to about 5%, by
total weight of the oral care composition.
[0079] Surfactants may include anionic surfactants such as
organophosphate, which include alkyl phosphates. These surface
active organophosphate agents have a strong affinity for enamel
surface and have sufficient surface binding propensity to desorb
pellicle proteins and remain affixed to enamel surfaces. Suitable
examples of organophosphate compounds include mono-, di- or
triesters represented by the general structure below wherein Z1,
Z2, or Z3 may be identical or different, at least one being an
organic moiety, in one example selected from linear or branched,
alkyl or alkenyl group of from 1 to 22 carbon atoms, optionally
substituted by one or more phosphate groups; alkoxylated alkyl or
alkenyl, (poly)saccharide, polyol or polyether group.
##STR00001##
[0080] Some other organophosphate agents include alkyl or alkenyl
phosphate esters represented by the following structure:
##STR00002##
wherein R1 represents a linear or branched, alkyl or alkenyl group
of from 6 to 22 carbon atoms, optionally substituted by one or more
phosphate groups; n and m, are individually and separately, 2 to 4,
and a and b, individually and separately, are 0 to 20; Z2 and Z3
may be identical or different, each represents hydrogen, alkali
metal, ammonium, protonated alkyl amine or protonated functional
alkyl amine such as an alkanolamine, or a
R1-(OCnH2n)a(OCmH2m)b-group. Examples of suitable agents include
alkyl and alkyl (poly)alkoxy phosphates such as lauryl phosphate;
PPGS ceteareth-10 phosphate; Laureth-1 phosphate; Laureth-3
phosphate; Laureth-9 phosphate; Trilaureth-4 phosphate; C12-18 PEG
9 phosphate; Sodium dilaureth-10 phosphate. In one example, the
alkyl phosphate is polymeric. Examples of polymeric alkyl
phosphates include those containing repeating alkoxy groups as the
polymeric portion, in particular 3 or more ethoxy, propoxy
isopropoxy or butoxy groups.
[0081] Zwitterionic or amphoteric surfactants useful in the present
invention can include derivatives of aliphatic quaternary ammonium,
phosphonium, and sulfonium compounds, in which the aliphatic
radicals can be straight chain or branched, and wherein one of the
aliphatic substituents contains from about 8 to 18 carbon atoms and
one contains an anionic water-solubilizing group, such as carboxy,
sulfonate, sulfate, phosphate or phosphonate. Suitable amphoteric
surfactants include betaine surfactants such as disclosed in U.S.
Pat. No. 5,180,577 to Polefka et al. Typical alkyl dimethyl
betaines include decyl betaine or 2-(N-decyl-N,N-dimethylammonio)
acetate, coco betaine or 2-(N-coco-N, N-dimethyl ammonio) acetate,
myristyl betaine, palmityl betaine, lauryl betaine, cetyl betaine,
stearyl betaine, etc. Amphoteric surfactants useful herein further
include amine oxide surfactants. The amidobetaines are exemplified
by cocoamidoethyl betaine, cocamidopropyl betaine (CAPB), and
lauramidopropyl betaine. The unwanted tastes often associated with
these surfactants are soapy, bitter, chemical, or artificial.
[0082] Additional suitable polymeric organophosphate agents can
include dextran phosphate, polyglucoside phosphate, alkyl
polyglucoside phosphate, polyglyceryl phosphate, alkyl polyglyceryl
phosphate, polyether phosphates and alkoxylated polyol phosphates.
Some specific examples are PEG phosphate, PPG phosphate, alkyl PPG
phosphate, PEG/PPG phosphate, alkyl PEG/PPG phosphate, PEG/PPG/PEG
phosphate, dipropylene glycol phosphate, PEG glyceryl phosphate,
PBG (polybutylene glycol) phosphate, PEG cyclodextrin phosphate,
PEG sorbitan phosphate, PEG alkyl sorbitan phosphate, and PEG
methyl glucoside phosphate. Suitable non-polymeric phosphates
include alkyl mono glyceride phosphate, alkyl sorbitan phosphate,
alkyl methyl glucoside phosphate, alkyl sucrose phosphates. The
impurities in these phosphates may induce a burning sensation
Impurities may include dodecanol, dodecanal, benzaldehyde, and
other TRPA1 or TRPV1 agonists.
[0083] Cationic surfactants useful in the present invention can
include derivatives of quaternary ammonium compounds having one
long alkyl chain containing from about 8 to 18 carbon atoms such as
lauryl trimethylammonium chloride, cetyl trimethylammonium bromide,
coconut alkyltrimethylammonium nitrite, cetyl pyridinium fluoride,
etc. Quaternary ammonium halides having detergent properties can be
used, such as those described in U.S. Pat. No. 3,535,421 to Briner
et al. Certain cationic surfactants can also act as germicides in
the oral care compositions disclosed herein.
[0084] Examples of some flavors and flavor components that may be
used in oral care compositions are mint oils, wintergreen, clove
bud oil, cassia, sage, parsley oil, marjoram, lemon, orange,
propenyl guaethol, heliotropine, 4-cis-heptenal, diacetyl,
methyl-.rho.-tert-butyl phenyl acetate, methyl salicylate, ethyl
salicylate, 1-menthyl acetate, oxanone, .alpha.-irisone, methyl
cinnamate, ethyl cinnamate, butyl cinnamate, ethyl butyrate, ethyl
acetate, methyl anthranilate, iso-amyl acetate, iso-amyl butyrate,
allyl caproate, eugenol, eucalyptol, thymol, cinnamic alcohol,
octanol, octanal, decanol, decanal, phenylethyl alcohol, benzyl
alcohol, .alpha.-terpineol, linalool, limonene, citral, neral,
geranial, geraniol nerol, maltol, ethyl maltol, anethole,
dihydroanethole, carvone, menthone, .beta.-damascenone, ionone,
.gamma.-decalactone, .gamma.-nonalactone, .gamma.-undecalactone, or
combinations thereof. Generally suitable flavoring ingredients are
chemicals with structural features and functional groups that are
less prone to redox reactions. These include derivatives of flavor
chemicals that are saturated or contain stable aromatic rings or
ester groups.
[0085] Flavors are generally present in an amount of from about
0.4% to about 5% or from about 1% to about 3%, by total weight of
the oral care composition.
[0086] Anti-tartar agents include pyrophosphate salts as a source
of pyrophosphate ion. The pyrophosphate salts useful in the present
compositions include, for example, the mono-, di- and tetraalkali
metal pyrophosphate salts and combinations thereof. Disodium
dihydrogen pyrophosphate (Na2H2P2O7), sodium acid pyrophosphate,
tetrasodium pyrophosphate (Na4P2O7), and tetrapotassium
pyrophosphate (K4P2O7) in their unhydrated as well as hydrated
forms are further species. In compositions of the present
invention, the pyrophosphate salt may be present in one of three
ways: predominately dissolved, predominately undissolved, or a
combination of dissolved and undissolved pyrophosphate. The amount
of pyrophosphate salt useful in making these compositions is any
tartar control effective amount. In varying examples, the amount of
pyrophosphate salt may be from about 1.5% to about 15%, from about
2% to about 10%, or about 3% to about 8%, by total weight of the
oral care composition.
[0087] Examples of some colorants that may be used in oral care
compositions include D&C Yellow No. 10, FD&C Blue No. 1,
FD&C Red No. 40, D&C Red No. 33 and combinations thereof.
In certain examples, the composition comprises colorant in an
amount of from about 0.0001% to about 0.1% or from about 0.001% to
about 0.01%, by weight of the oral care composition. Some colorants
provide an unwanted taste, for example, D&C Red No. 33. The
unwanted tastes often associated with this colorant are metallic,
sharp, or chemical. Colorants are generally present in an amount of
from about 0.001% to about 0.5%, by weight of the oral care
composition.
[0088] Sensates may also be part of an oral care composition.
Sensate molecules such as cooling, warming, and tingling agents are
useful to deliver signals to the user. Sensates are generally
present in an amount of from about 0.001% to about 0.8%, by weight
of the oral care composition. The most well-known cooling sensate
compound can be menthol, particularly L-menthol, which is found
naturally in peppermint oil notably of Mentha arvensis L and Mentha
viridis L. Other isomers of menthol (neomenthol, isomenthol and
neoisomenthol) have somewhat similar, but not identical odor and
taste, for instance having disagreeable odor and taste described as
earthy, camphor, musty, etc. The biggest difference among the
isomers is in their cooling potency. L-menthol provides the most
potent cooling, by having the lowest cooling threshold of about 800
ppb, which is the concentration level where the cooling effect can
be clearly recognized. At this level, there can be no cooling
effect for the other isomers. For example, d-neomenthol is reported
to have a cooling threshold of about 25,000 ppb and 1-neomenthol
about 3,000 ppb.
[0089] Of the menthol isomers the 1-isomer occurs most widely in
nature and is typically what is referred by the name menthol having
coolant properties. L-menthol has the characteristic peppermint
odor, has a clean fresh taste and exerts a cooling sensation when
applied to the skin and mucosal surfaces.
[0090] Among synthetic coolants, many are derivatives of or are
structurally related to menthol, for example containing the
cyclohexane moiety, and derivatized with functional groups
including carboxamide, ketal, ester, ether and alcohol. Examples
include the .rho.-menthanecarboxamide compounds such as
N-ethyl-.rho.-menthan-3-carboxamide, known commercially as "WS-3",
and others in the series such as WS-5
(N-ethoxycarbonylmethyl-.rho.-menthan-3-carboxamide), WS-12
(1R*,2S*)-N-(4-Methoxyphenyl)-5-methyl-2-(1-methylethyl)cyclohexanecarbox-
amide] and WS-14 (N-tert-butyl-.rho.-menthan-3-carboxamide).
Examples of menthane carboxy esters include WS-4 and WS-30. An
example of a synthetic carboxamide coolant that is structurally
unrelated to menthol is N,2,3-trimethyl-2-isopropylbutanamide,
known as "WS-23". Additional examples of synthetic coolants include
alcohol derivatives such as 3-(1-menthoxy)-propane-1,2-diol known
as TK-10, isopulegol (under the tradename Coolact P) and
.rho.-menthane-3,8-diol (under the tradename Coolact 38D) all
available from Takasago Corp., Tokyo, Japan; menthone glycerol
acetal known as MGA; menthyl esters such as menthyl acetate,
menthyl acetoacetate, menthyl lactate known as Frescolat.RTM.
supplied by Symrise AG, Holzminden, Germany, and monomenthyl
succinate under the tradename Physcool from V. Mane FILS, Notre
Dame, France. TK-10 is described in U.S. Pat. No. 4,459,425 to
Amano et al. Other alcohol and ether derivatives of menthol are
described in GB 1,315,626 and in U.S. Pat. Nos. 4,029,759;
5,608,119; and 6,956,139. WS-3 and other carboxamide cooling agents
are described in U.S. Pat. Nos. 4,136,163; 4,150,052; 4,153,679;
4,157,384; 4,178,459 and 4,230,688.
[0091] Additional N-substituted .rho.-menthane carboxamides are
described in WO 2005/049553A1 including
N-(4-cyanomethylphenyl)-.rho.-menthanecarboxamide,
N-(4-sulfamoylphenyl)-.rho.-menthanecarboxamide,
N-(4-cyanophenyl)p-menthanecarboxamide,
N-(4-acetylphenyl)-.rho.-menthanecarboxamide,
N-(4-hydroxymethylphenyl)-.rho.-menthanecarboxamide and
N-(3-hydroxy-4-methoxyphenyl)-.rho.-menthanecarboxamide. Other
N-substituted .rho.-menthane carboxamides include amino acid
derivatives such as those disclosed in WO 2006/103401 and in U.S.
Pat. Nos. 4,136,163; 4,178,459 and 7,189,760 such as
N-((5-methyl-2-(1-methylethyl)cyclohexyl)carbonyl)glycine ethyl
ester and N-((5-methyl-2-(1-methylethyl)cyclohexyl)carbonyl)alanine
ethyl ester. Menthyl esters including those of amino acids such as
glycine and alanine are disclosed e.g., in EP 310,299 and in U.S.
Pat. Nos. 3,917,613; 3,991,178; 5,703,123; 5,725,865; 5,843,466;
6,365,215; and 6,884,903. Ketal derivatives are described, e.g., in
U.S. Pat. Nos. 5,266,592; 5,977,166; and 5,451,404. Additional
agents that are structurally unrelated to menthol but have been
reported to have a similar physiological cooling effect include
alpha-keto enamine derivatives described in U.S. Pat. No. 6,592,884
including 3-methyl-2-(1-pyrrolidinyl)-2-cyclopenten-1-one (3-MPC),
5-methyl-2-(1-pyrrolidinyl)-2-cyclopenten-1-one (5-MPC), and
2,5-dimethyl-4-(1-pyrrolidinyl)-3(2H)-furanone (DMPF); icilin (also
known as AG-3-5, chemical name
1-[2-hydroxyphenyl]-4-[2-nitrophenyl]-1,2,3,6-tetrahydropyrimidine-2-one)
described in Wei et al., J. Pharm. Pharmacol. (1983), 35:110-112.
Reviews on the coolant activity of menthol and synthetic coolants
include H. R. Watson, et al. J. Soc. Cosmet. Chem. (1978), 29,
185-200 and R. Eccles, J. Pharm. Pharmacol., (1994), 46,
618-630.
[0092] Additional agents that are structurally unrelated to menthol
but have been reported to have a similar physiological cooling
effect include alpha-keto enamine derivatives described in U.S.
Pat. No. 6,592,884 including
3-methyl-2-(1-pyrrolidinyl)-2-cyclopenten-1-one (3-MPC),
5-methyl-2-(1-pyrrolidinyl)-2-cyclopenten-1-one (5-MPC), and
2,5-dimethyl-4-(1-pyrrolidinyl)-3(2H)-furanone (DMPF); icilin (also
known as AG-3-5, chemical name
1-[2-hydroxyphenyl]-4-[2-nitrophenyl]-1,2,3,6-tetrahydropyrimidine-2-one)
described in Wei et al., J. Pharm. Pharmacol. (1983), 35:110-112
and phosphine oxides as reported in U.S. Pat. No. 4,070,496.
[0093] Some examples of warming sensates include ethanol; capsicum;
nicotinate esters, such as benzyl nicotinate; polyhydric alcohols;
capsicum powder; a capsicum tincture; capsicum extract; capsaicin;
homocapsaicin; homodihydrocapsaicin; nonanoyl vanillyl amide;
nonanoic acid vanillyl ether; vanillyl alcohol alkyl ether
derivatives such as vanillyl ethyl ether, vanillyl butyl ether,
vanillyl pentyl ether, and vanillyl hexyl ether; isovanillyl
alcohol alkyl ethers; ethylvanillyl alcohol alkyl ethers; veratryl
alcohol derivatives; substituted benzyl alcohol derivatives;
substituted benzyl alcohol alkyl ethers; vanillin propylene glycol
acetal; ethylvanillin propylene glycol acetal; ginger extract;
ginger oil; gingerol; zingerone; or combinations thereof. Warming
sensates are generally included in an oral care composition at a
level of about 0.05% to about 2%, by weight of the oral care
composition.
[0094] Abrasive polishing material can be any material that does
not excessively abrade dentin. The oral care compositions of the
present invention may comprise abrasive polishing material in an
amount of from about 6% to about 70% or from about 10% to about
50%, by weight of the oral care composition. Typical abrasive
polishing materials include silicas including gels and
precipitates; aluminas; phosphates including orthophosphates,
polymetaphosphates, and pyrophosphates; and mixtures thereof.
Specific examples include dicalcium orthophosphate dihydrate,
calcium pyrophosphate, tricalcium phosphate, calcium
polymetaphosphate, insoluble sodium polymetaphosphate, rice hull
silica, hydrated alumina, beta calcium pyrophosphate, calcium
carbonate, and resinous abrasive materials such as particulate
condensation products of urea and formaldehyde, and others such as
disclosed by Cooley et al in U.S. Pat. No. 3,070,510. In certain
examples, if the oral composition or particular phase comprises a
polyphosphate having an average chain length of about 4 or more,
calcium containing abrasives and alumina are not preferred
abrasives.
[0095] Silica dental abrasives of various types are often used in
oral care compositions due to their exceptional dental cleaning and
polishing performance without unduly abrading tooth enamel or
dentine. Silica abrasive polishing materials that may be used in
the present invention, as well as other abrasives, generally have
an average particle size ranging between about 0.1 to about 30
.mu.m or from about 5 to about 15 .mu.m. The abrasive can be
precipitated silica or silica gels such as the silica xerogels
described in Pader et al., U.S. Pat. No. 3,538,230 and DiGiulio,
U.S. Pat. No. 3,862,307. Silica xerogels marketed under the trade
name "Syloid" by the W.R. Grace & Company, Davison Chemical
Division, Augusta, Ga. may be used. Also precipitated silica
materials such as those marketed by the J. M. Huber Corporation,
Edison, N.J. under the trade name, "Zeodent", particularly the
silica carrying the designation "Zeodent 119", may be used. The
types of silica dental abrasives useful in the oral care
compositions of the present invention are described in more detail
in Wason, U.S. Pat. No. 4,340,583; and Rice U.S. Pat. Nos.
5,589,160; 5,603,920; 5,651,958; 5,658,553; and 5,716,601.
[0096] Thickening material or binders may be used to provide a
desirable consistency to the oral care compositions of the present
invention. For example when the oral care compositions are in the
form of dentifrices, topical oral gels, mouthrinse, denture
product, mouthsprays, lozenges, oral tablets or chewing gums, the
amount and type of the thickening material will depend upon the
form of the product. Thickening materials include carboxyvinyl
polymers, carrageenan, hydroxyethyl cellulose, and water soluble
salts of cellulose ethers such as sodium carboxymethylcellulose and
sodium hydroxyethyl cellulose. Natural gums such as gum karaya,
xanthan gum, gum arabic, and gum tragacanth can also be used.
Colloidal magnesium aluminum silicate or finely divided silica can
be used as part of the thickening material to further improve
texture. Thickening materials can be used in an amount from about
0.1% to about 15%, by weight of the oral care composition.
[0097] Humectants keep oral care compositions from hardening upon
exposure to air and certain humectants can also impart desirable
sweetness of flavor to dentifrice compositions. Suitable humectants
for use in the present invention include glycerin, sorbitol,
polyethylene glycol, propylene glycol, xylitol, and other edible
polyhydric alcohols. The oral care compositions of the present
invention may comprise humectants in an amount of from about 0% to
about 70% or from about 15% to about 55%, by weight of the oral
care composition.
EXAMPLE 1
[0098] Examples 1A-1D are dentifrice compositions that may be
prepared by conventional methods chosen by the formulator and
illustrate dentifrice compositions containing polyquaternium-2. The
compositions can exhibit reduced bitterness.
TABLE-US-00001 Ingredient Ex. 1A 1B 1C 1D FD&C Blue #1 Color
0.045% 0.045% 0.045% 0.045% Solution Sodium Fluoride 0.243% 0.243%
0.243% 0.243% CARBOMER 956 0.300% 0.300% 0.300% 0.300% Sodium
Saccharin 0.300% 0.300% 0.300% 0.300% Sodium Phosphate, 0.419%
0.419% 0.419% 0.419% Monobasic, Monohydrate Titanium Dioxide 0.525%
0.525% 0.525% 0.525% Carboxymethycellulose 0.800% 0.800% 0.800%
0.800% Sodium Peppermint Flavor 1.000% 1.000% 0% 0% Spearmint
Flavor 0% 0% 1.000% 1.000% Mirapol .RTM. A 15.sup.1 0% 0.1% 0% 0.1%
Tribasic Sodium Phosphate 1.100% 1.100% 1.100% 1.100% Dodecahydrate
Sodium Lauryl Sulfate 28% 4.000% 4.000% 4.000% 4.000% Solution
Silica, Dental Type, NF 15.000% 15.000% 15.000% 15.000% (Zeodent
119) SORBITOL SOLUTION 54.673% 54.673% 54.673% 54.673% LRS USP
Water Purified, USP, QS. Q.S. Q.S. Q.S. PhEur, JP, JSCI
.sup.1Available from Rhodia, Cranbury, New Jersey
EXAMPLE 2
[0099] Examples 2A-2C are dentifrice compositions that may be
prepared by conventional methods chosen by the formulator and
illustrate dentifrice compositions containing polyquaternium-2. The
compositions can exhibit reduced bitterness, especially bitterness
from metals.
TABLE-US-00002 Ingredient 2A 2B 2C Mica, Titanium Dioxide coated
0.4% 0.4% 0.4% Sodium Fluoride 0.243% 0.243% 0.243% Polyethylene
Specks, Blue 0.35% 0.35% 0.35% Carrageenan 0.7% 0.7% 0.7% Sodium
Saccharin 0.300% 0.300% 0.300% Titanium Dioxide 0.525% 0.525%
0.525% Carboxymethycellulose Sodium 1.3% 1.3% 1.3%
Hydroxyethylcellulose 0.3% 0.3% 0.3% Peppermint Flavor 1.000%
1.000% 1.000% Added Menthol 0% 0.25% 0.25% Sodium Lauryl Sulfate
28% 1.0% 1.0% 1.0% Solution Silica, Dental Type, NF (Zeodent 17%
17% 17% 119) Sorbitol Solution LRS USP 40.5% 40.5% 40.5% Zinc
Citrate Dihydrate 0.788% 0.788% 0.788% Stannous Chloride Dihydrate
0.209% 0.209% 0.209% Mirapol .RTM. A 15.sup.2 0% 0.5% 0.1% G180
Coolant.sup.3 0.025% 0.010% 0.010% Vanillyl Butyl Ether 0% 0% 0%
Zingerone 0% 0% 0% Frescolat MGA coolant 0.0225% 0.010% 0.010% WS-5
coolant 0.007% 0.010% 0% Sucralose 0.2% 0.2% 0.2% Water Purified,
USP Q.S. Q.S. Q.S. .sup.2Available from Rhodia, Cranbury, New
Jersey .sup.3Available from Givaudan of Cincinnati, OH
EXAMPLE 3
[0100] Examples 3A-3B are mouthwash compositions that may be
prepared by conventional methods chosen by the formulator and
illustrate mouthwash compositions containing polyquaternium-2. The
compositions can exhibit reduced bitterness.
TABLE-US-00003 Ingredient 3A 3B Ethanol, USP 190 proof 15.0 15.0
Glycerin 7.5 7.5 Polysorbate 80, NF 0.12 0.12 Flavor 0.16 0.16
Saccharin Sodium 0.067 0.067 Color Solution 0.04 0.04 G-180 Coolant
(7.5% solution).sup.4 0.03 0.03 Calcium Chloride 0.025 0.025
Cetylpyridinium Chloride 0.045 0.045 Benzoic Acid 0.005 0.005
Sodium Benzoate 0.054 0.054 Mirapol .RTM. A 15.sup.5 0.05 0.1 Water
QS QS .sup.4Available from Givaudan of Cincinnati, OH
.sup.5Available from Rhodia, Cranbury, New Jersey
Assay for Taste Receptors
[0101] Human fungiform taste bud cells were isolated from tongues
of humans as described in Ozdener, Mehmet, and Nancy Rawson.
"Primary Culture of Mammalian Taste Epithelium." Methods in
Molecular Biology; 2013; 945: 95-107.
[0102] Then the cells were further cultured according to the
following procedure. The cells were grown in a Corning.RTM. cell
culture flask, with a surface area of 75 cm.sup.2, a canted neck,
and a 0.2 .mu.m Vent cap (Catalog#430641, available from VWR
International, Bridgeport, N.J., USA) at 37.degree. C. using a
growth medium containing 500 mL of Iscove's Modified Dulbecco's
Media (IMDM), 100 mL of Ham's F12 Nutrient Mixture, 60 mL Fetal
Bovine Serum (FBS), and 150 .mu.g/mL Penicillin-Streptomycin
cocktail (all growth media components available from Life
Technologies, Grand Island, N.Y., USA).
[0103] After the cells reach 80-90% confluence, which generally
takes about seven days of cultivation, the cells were released by
adding 3 mL of Gibco.RTM. Trypsin-EDTA (0.05%) solution (available
from Life Technologies) at 37.degree. C. in couple of minutes,
followed by adding 12 mL of cell growth medium to deactivate
trypsin. Then the cells were diluted in the growth medium at
approximately 250,000 cells/mL. Next, 100 .mu.l volume of cell
suspension containing 20,000 to 30,000 cells were seeded into each
well of a Falcon.RTM. 96 Well Black with Clear Flat Bottom
TC-Treated Imaging Plate (REF #353219, available from VWR
International, Bridgeport, N.J., USA) and the cells are grown
overnight.
[0104] After the overnight cultivation, the cell culture media was
removed by aspiration. Then, 100 .mu.L of Calcium-6QF solution was
added to each well. The Calcium-6QF solution was made by dissolving
the contents of one vial of Calcium-6QF (available from Molecular
Devices, Sunnyvale, Calif., USA) in 20 mL of assay buffer, which
contains Hank's Balanced Salt Solution (HBSS) with 20 mM HEPES
(4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) (both
components are available from Life Technologies). The plate was
then incubated at 37.degree. C. for 105 min and at room temperature
for 15 min. Then the 96-well plate is placed in a FLIPR.RTM. Tetra
High Throughput Cellular Screening System (available from Molecular
Devices) and 20 .mu.L of working solution, as described below, are
added to each well. The fluorescence signal was read continuously
for 5 min, where the excitation and emission wave lengths used were
488 nM and 510 nM respectively. The peak value and/or area under
the curve after five minutes was calculated and recorded.
[0105] In order to form the working solution, the test material was
diluted with the assay buffer. Examples of test materials can
include, but are not limited to GG solutions, PG solutions, 1,3-PPD
solutions, full formulations such as those in Example 4 and 5, and
combinations thereof. The amount of assay buffer varies depending
on the desired final concentration, which occurs when the test
material is in the wells. For example, if the test material is GG,
it can be desirable to have a final concentration of 2 mM. Thus, a
12 mM working solution is made and when it is added to the wells,
the concentration is further reduced to a final concentration of 2
mM. In another example, in order to make a working solution for
Examples 4 and 5, and other full formulations, 1 mL of the example
is added to 27 mL of assay buffer to form the working solution and
then it is added to the wells for an overall reduction of 162
fold.
[0106] While the specification concludes with the claims
particularly pointing and distinctly claiming the invention, it is
believed that embodiments of the present invention will be better
understood from this description. In all embodiments of the present
invention, all weight percentages are by weight of the total
composition, unless specifically stated otherwise. All ratios are
weight ratios, unless specifically stated otherwise. All ranges are
inclusive and combinable. The number of significant digits conveys
neither limitation on the indicated amounts nor on the accuracy of
the measurements. All measurements are understood to be made at
25.degree. C. and at ambient conditions, where "ambient conditions"
means conditions under about one atmosphere of pressure and at
about 50% relative humidity. All such weights as they pertain to
listed ingredients are based on the active level and do not include
carriers or by-products that may be included in commercially
available materials, unless otherwise specified.
[0107] The dimensions and values disclosed herein are not to be
understood as being strictly limited to the exact numerical values
recited. Instead, unless otherwise specified, each such dimension
is intended to mean both the recited value and a functionally
equivalent range surrounding that value. For example, a dimension
disclosed as "40 mm" is intended to mean "about 40 mm."
[0108] Every document cited herein, including any cross referenced
or related patent or application and any patent application or
patent to which this application claims priority or benefit
thereof, is hereby incorporated herein by reference in its entirety
unless expressly excluded or otherwise limited. The citation of any
document is not an admission that it is prior art with respect to
any invention disclosed or claimed herein or that it alone, or in
any combination with any other reference or references, teaches,
suggests or discloses any such invention. Further, to the extent
that any meaning or definition of a term in this document conflicts
with any meaning or definition of the same term in a document
incorporated by reference, the meaning or definition assigned to
that term in this document shall govern.
[0109] While particular embodiments of the present invention have
been illustrated and described, it would be obvious to those
skilled in the art that various other changes and modifications can
be made without departing from the spirit and scope of the
invention. It is therefore intended to cover in the appended claims
all such changes and modifications that are within the scope of
this invention.
* * * * *