U.S. patent application number 10/559794 was filed with the patent office on 2006-06-22 for nail restructuring compositions for topical application.
Invention is credited to Federico Mailland.
Application Number | 20060134039 10/559794 |
Document ID | / |
Family ID | 33395922 |
Filed Date | 2006-06-22 |
United States Patent
Application |
20060134039 |
Kind Code |
A1 |
Mailland; Federico |
June 22, 2006 |
Nail restructuring compositions for topical application
Abstract
The present invention is directed to compositions containing a
combination of a herb from the genus Equisetum together with one
film forming agent and its use as a nail topical formulation, like
nail varnish, cream, gel, lotion or foam. The present invention is
further directed to the use of a water soluble film forming agent
as an additive in a nail topical formulation. These compositions
can be used to treat specific alterations of the ungula structure,
like reduced strength, onychoschizia and ungula brittleness.
Inventors: |
Mailland; Federico; (Milano,
IT) |
Correspondence
Address: |
NIXON & VANDERHYE, PC
901 NORTH GLEBE ROAD, 11TH FLOOR
ARLINGTON
VA
22203
US
|
Family ID: |
33395922 |
Appl. No.: |
10/559794 |
Filed: |
June 15, 2004 |
PCT Filed: |
June 15, 2004 |
PCT NO: |
PCT/EP04/06549 |
371 Date: |
December 8, 2005 |
Current U.S.
Class: |
424/70.1 |
Current CPC
Class: |
A61P 17/00 20180101;
A61K 9/7015 20130101; A61Q 3/02 20130101; A61K 9/0014 20130101;
A61K 8/9741 20170801; A61K 47/10 20130101; A61K 47/36 20130101;
A61K 9/12 20130101; A61K 31/722 20130101; A61P 31/10 20180101; A61P
43/00 20180101; A61K 47/26 20130101; A61K 47/06 20130101; A61K
36/11 20130101; A61K 8/736 20130101; A61K 47/12 20130101; A61K
47/38 20130101; A61Q 3/00 20130101; A61K 31/722 20130101; A61K
2300/00 20130101; A61K 36/11 20130101; A61K 2300/00 20130101 |
Class at
Publication: |
424/070.1 |
International
Class: |
A61K 8/00 20060101
A61K008/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 23, 2003 |
EP |
03076934.3 |
Claims
1-24. (canceled)
25. Method for the treatment of Onychoschizia which comprises the
administration of a topical composition comprising: a) at least one
herb extract from the genus Equisetum, b) at least one film forming
agent to a patient in needs of such a treatment.
26. Method according to claim 25, wherein said composition
comprises c) at least one physiologically acceptable carrier.
27. Method according to claim 25, wherein said composition
comprises d) at least one sulfur donor.
28. Method according to claim 25, wherein the component a) is
selected from: Equisetum arvense in form of plant or part of plant,
juice, dry extract, alcoholic extract, hydro alcoholic extract or
glycolic extract, or Equisetum hiemale in form of plant or part of
plant, juice, dry extract, alcoholic extract, hydro alcoholic
extract or glycolic extract.
29. Method according to claim 25, wherein the component a) is a
glycolic extract of Equisetum arvense.
30. Method according to claim 25, wherein component b) is a
water-soluble film forming agent.
31. Method according to claim 30, wherein said water-soluble film
forming agent is a derivative of chitosan.
32. Method according to claim 31 wherein said derivative of
chitosan is selected from hydroxyalkyl chitosans and/or
carboxyalkyl chitosans.
33. Method according to claim 32 wherein said hydroxyalkyl
chitosans are selected from chitosans which are derivatized with
C.sub.1-6 alkyl groups possessing 1 to 3 hydroxy groups, preferably
hydroxypropyl chitosan.
34. Method according to claim 32 wherein said carboxyalkyl
chitosans are selected from chitosans which are derivatized with
C.sub.1-6 alkyl groups possessing 1 to 3 carboxy groups, preferably
carboxymethyl chitosan.
35. Method according to claim 25, wherein the component c) is water
or a mixture of water with at least one co-solvent.
36. Method according to claim 35, wherein said co-solvent is an
alcohol.
37. Method according to claim 36, wherein said alcohol is a
branched or linear alcohol having 1 to 3 hydroxy groups and 2 to 6
carbon atoms, preferably ethanol, 1-propanol and/or
isopropanol.
38. Method according to claim 25, wherein the component d) is
selected from sulphated amino acids and derivatives thereof,
1-methionine, 1-cysteine, 1-cystine, taurine,
4-thiazolidinecarboxylic acid and/or methylsulphonylmethane.
39. Method according to claim 25, wherein said composition
comprises penetration enhancers, sedimentation retarders, chelating
agents, antioxidants, silicates, aroma substances, wetting agents,
lanolin derivates, light stabilizers and/or antibacterial
substances.
40. Method according to claim 25, wherein said composition
comprises an additional active agent selected from antimycotic
agents, antibiotic agents, anti-inflammatory agents, antiseptic
agents and/or local anaesthetic agents.
41. Method according to claim 25, wherein the component a) is
present in an amount of 0.1 to 15 wt. %, preferably 0.3 to 15 wt.
%, more preferably 0.5 to 10 wt. % by weight of the total
composition.
42. Method according to claim 25, wherein the component b) is
present in an amount of 0.1 to 10 wt. %, preferably by 0.3 to 8 wt.
%, more preferably 0.5 to 5 wt. % by weight of the total
composition.
43. Method according to claim 25, wherein the component c) is
present in an amount of 40 to 99.8 wt. %, preferably 60 to 99 wt.
%, more preferably 80 to 95 wt. %, by weight of the total
composition.
44. Method according to claim 43, wherein the water content in
component c) is 15 to 70 wt. % , preferably 30 to 65 wt. % by
weight of component c).
45. Method according to claim 25, wherein the component d) is
present in an amount from 0.1 to 20 wt. %, preferably from 0.2 to
10 wt. % by weight of the total composition.
46. Method according to claim 25, wherein said composition
essentially consists of: b) at least one herb extract from the gene
Equisetum, c) at least one film forming agent, d) at least one
physiologically acceptable carrier, e) at least one sulfur
donor.
47. Method according to claim 25, as a nail topical formulation.
Description
[0001] The present invention relates to a composition comprising at
least a herb from the genus Equisetum and one film forming agent
and its use as a nail topical formulation. The present invention is
further directed to the use of a water soluble film forming agent
as an additive in a nail topical formulation. These compositions
can be used to treat specific alterations of the ungual structure,
like reduced strength, onychoschizia and ungual brittleness.
[0002] The strength and physical character of the nail plate is
attributable to both its constituents and design. The features of
design worthy of note are the double curvature, in transverse and
longitudinal axes, and the flexibility of the ventral plate
compared to the dorsal aspect. The first one provides rigidity,
whereas the latter allows moderate flexion deformity and slightly
less extension. The most proximal component of the matrix provides
the corneocytes of the dorsal nail surface. These usually provide a
shiny surface. When the matrix is altered by disease or the nail
surface Is subject to trauma, this shine is lost.
[0003] It is well known that nail tensile, flexural and tearing
strength change with age, sex and the digit from which the nail
derived. The nail is 1000 times more permeable to water than the
skin, and consequently the nail structure reacts to prolonged or
repeated contact with water. Immersion of the nail in water for an
hour increases its weight by over 20%, moreover it renders the nail
more flexible. After 2 hours, the flexibility is still increasing,
while the water content does no more increase. The analysis of in
vivo nail by Raman spectroscopy suggests that after soaking in
water for 10 minutes, the .alpha.-helical protein conformation of
the distal nail is made more loose, with greater spacing between
proteins as water occupies the interstices. Proximal nail, on the
contrary, is still manifesting a high degree of hydration before
immersion.
[0004] Onychoschizia and ungual brittleness is a widespread
condition that affects mainly housewives, workmen and workwomen,
dressmakers, nurses, but also employees.
[0005] Longitudinal grooves represent long-lasting conditions that
can occur physiologically as shallow and delicate furrows, usually
parallel and separated by low, projecting ridges. They become more
prominent with age and in certain pathological conditions.
[0006] Longitudinal ridges are small rectilinear projections that
extend from the proximal nail fold until the free edge of the nail,
or may stop shorter. Oblique lines (chevron lines) are more common
in children than in adults and their significance is still
debatable.
[0007] Transverse lines in form of sulci, limited proximally by
slightly elevated ridges and affecting the surface of all nails at
the corresponding level, have been described as retrospective
indicators of a number of pathological status. They reflect a
temporary reduction in nail matrix activity.
[0008] Lamellar splitting (onychoschizia) is a condition found in
27-35% of normal adult women. The distal portion of the nail splits
horizontally in this condition. The nail is formed in layers
analogous to the formation of scales in the skin: the thin lamellae
then break off. Exogenous factors contribute to the defect it is
common in people who carry out a great deal of housework, whose
nails are repeatedly soaked in water and then dried.
[0009] Changes in the fingernails of old people are mostly related
to diminished tissue repair and inflammatory or degenerative
changes of the distal interphalangeal joint. These influences are
associated with reduced rate of longitudinal nail growth, thinning
of the nail plate and accentuation of longitudinal ridges.
[0010] Variations in thickness and consistency of the toenails
occur in elderly and are mostly attributable to changes in
peripheral circulation.
[0011] Healthy looking nails should be smooth, curved, void of any
spotting, and should not have any hollows or ridges. Nails in bad
conditions can be very harmful for the personal image, if neglected
can cause chronic infections, associated to long-lasting
embarassment and pain. Noteworthy, they may be considered a social
problem and/or a professional illness.
[0012] Repetitive and prolonged wetting and drying of the
fingernails is the single most common cause of splitting and ridges
of the nails. Splitting of the nails is rarely caused by internal
disease or vitamin deficiency, nail polish remover causes
onychoschizia (lamellar splitting), finally trauma to the fingers
contributes to onychoschizia.
[0013] Among the cosmetic damages of the nails, the following can
be included: breaking, splitting, fracturing, brittleness, white
spots or ridges, poor nail growth, color or shape changes.
[0014] Mineral oil has no effect on flexibility, although it can
act to maintain some of the flexibility imbued by water. This
principle is applied in the treatment of onychoschizia, where
repeated hydration and drying of the nail plate results in
splitting at the free edge. Splitting can be partially overcome by
applications of emollients after soaking the nails in water. The
use of a nail varnish, normally a water insoluble polyvinyl resin
film, can also decrease water loss: the disadvantage of that
procedure is that the removal of the nail varnish by an organic
solvent can further damage the nail structure by increasing
brittleness and splitting.
[0015] It is therefore the object of the present invention to
provide a nail topical formulation which overcomes the above noted
disadvantages, which can be easily formulated, prepared and stored
and provides good nail restructuring, hardening and strengthening
effect.
DESCRIPTION OF THE INVENTION
[0016] The object of the present invention is to provide a novel
nail topical formulation comprising [0017] a) at least one herb
extract from the genus Equisetum, [0018] b) at least one film
forming agent.
[0019] Moreover, the present invention is directed to the use of
said composition as a nail topical formulation, such as varnish,
cream, gel, lotion or foam.
[0020] The composition in accordance to the present invention
comprises as a component a) at least one herb extract from the
genus Equisetum. The herb extract may be selected from any known
species belonging to the genus Equisetum, moreover it may be a dry
extract, or an alcoholic extract, or an hydro alcoholic extract, or
a glycolic extract. Examples include: [0021] Equisetum arvense in
form of plant or part of plant, juice, dry extract, hydro alcoholic
extract or glycolic extract [0022] Equisetum hiemale in form of
plant or part of plant, juice, dry extract, hydro alcoholic extract
or glycolic extract
[0023] The herb extract is preferably selected from Equisetum
arvense.
[0024] The herb extract may be used alone or may be a mixture of
different extracts. The preferred amount of component a) in the
composition is in the range of 0.1 to 15 wt. %, more preferably 0.3
to 15 wt. %, most preferably 0.5 to 10 wt. % by weight of the total
composition.
[0025] The composition of the present invention also comprises as a
component b) at least one film forming agent, preferably a water
soluble film forming agent. The water soluble film forming agent
may be selected from any water soluble film forming agent known in
the art. Film forming agents are by definition (see e.g. DIN 55945
(19/1988)) components of a binder which are essential for forming a
film, i.e. a thin layer or cover.
[0026] The term "water soluble" means in this context that the film
forming agent is fully compatible with water so that at 20.degree.
C. one part of the film forming agent is soluble in 100 parts or
less, preferably 50 parts or less, more preferably 30 parts or
less, most preferably 10 parts or less of water.
[0027] Due to the presence of a water soluble film forming agent
the use of a wide variety of agents is possible, ensuring, thus, an
easy application of the drug and simplifying also the storage of
the formulation. Since the film forming agent may be used with a
wide variety of solvents, the formulation can be chosen in a way
that the nail topical formulation composition in accordance with
the present invention does not burn nor cause irritation and is
easily removable without the use of organic solvents. Furthermore,
the water soluble film forming agent used in the composition
according to the present invention provides a non-glossy,
non-sticky and very plastic film which possesses a matte and
natural look favored by both women and men.
[0028] As the film forming agent used in accordance to the present
invention typically macromolecular compounds of synthetic or
natural origin can be used, which are water soluble or have been
derivatized by functional groups in order to impart water
solubility. Preferably, water soluble derivatives of naturally
occurring polymers or derivatives of naturally occurring polymers
are employed. It is particularly preferred to use water soluble
derivatives of chitosan, the latter being the deacylation product
of chitin and being itself water insoluble. Chitin is a natural
substance constituting, for example, the carapace of crustaceans
and many insects.
[0029] Particularly suitable are hydroxyalkyl chitosans and
carboxyalkyl chitosans. Hydroxyalkyl chitosans include chitosans
which are derivatized with C.sub.1-6 alkyl groups possessing 1 to 3
hydroxy groups. As an example, hydroxypropyl chitosan can be
mentioned. Carboxyalkyl chitosans include chitosans which are
derivatized with C.sub.1-6 alkyl groups possessing 1 to 3 hydroxy
groups. As an example, carboxymethyl chitosan can be mentioned.
[0030] The water soluble film forming agent (component b)) can be
used in an amount as long as the formation of a film of the claimed
composition can be provided. Typically, the amount of the component
b) is in the range of 0.1 to 10 wt. %, more preferably 0.3 to 8 wt.
%, most preferably 0.5 to 5 wt. % by weight of the total
composition.
[0031] The composition in accordance with the present invention
further comprises usually as a component c) at least one
physiologically acceptable carrier, preferably a solvent.
[0032] The solvents typically a water based solvent in order to
avoid a frequent and repeated exposure of the nails and the
adjacent skin to aggressive organic solvents. Thus, the
physiologically acceptable solvent includes water and mixtures of
water with co-solvents.
[0033] The co-solvent which can be used in combination with water
in the composition in accordance with the present invention is not
particularly critical but is selected from the usual
physiologically safe organic solvents known in the art. Typically,
the co-solvent is a hydrophilic solvent and it is preferably
selected from alcohols.
[0034] Suitable alcohols are branched or linear alcohols having 1
to 3 hydroxy groups and 2 to 6 carbon atoms whereby the hydroxy
groups may be partially converted to ethers. Particularly suitable
alcohols are ethanol, 1-propanol, 2-propanol (isopropanol).
Particularly suitable are ethanol or isopropanol. Preferably, the
total amount of co-solvent used in combination with water present
in the composition in accordance with the present invention is
sufficient volatile to provide acceptable drying times of the nail
topical formulation. Usual drying times, i.e. the time taken to be
dry by touch, are less than about five minutes, preferably less
than about two minutes.
[0035] When water is used in combination with one or more
co-solvents, it is important that the individual solvents are
compatible with each other and form a clear solution which is
stable against phase separation over time. Moreover, the solvent
systems used in accordance with the present invention should not
only provide uniform evaporation rates and good stability but also
enable good flow viscosity characteristics in order to ease the
application of the nail topical formulation.
[0036] The at least one physiologically acceptable solvent
(component c)) is usually employed in an amount suitable in order
to impart the above noted properties. It is preferred that the
component c) is present in the composition in accordance with the
present invention in an amount of 40 to 99.8 wt. %, more preferably
60 to 99 wt. %, most preferably 80 to 95 wt. % by weight of the
total composition. The water content in component c) is typically
15 to 70 wt. %, preferably 30 to 65 wt. % by weight of component c)
in order to impart the desired properties. Consequently, the
co-solvent used in combination with water is typically present in
an amount of 30 to 85 wt. %, preferably 35 to 70 wt. % by weight of
component c) in order to impart the above noted properties.
[0037] The composition according to the present invention may
further contain other active agents besides the Equisetum herb
extract, e.g. sulfur donors, antimycotic agents, antibiotic agents,
anti-inflammatory agents, antiseptic agents and/or local
anaesthetic agents.
[0038] Sulfur donors may interact with the formation and/or the
reconstruction process of the nail keratin.
[0039] Examples of sulfur donors that may be included in the
composition according to the present invention include sulphated
amino acids and derivatives, 1-methionine, 1-cysteine, 1-cystine,
taurine, 4-thiazolidinecarboxylic acid, methylsulphonylmethane.
[0040] These agents may be used in the respective amounts customary
in the art. They are usually employed in an amount from 0.1 to 20
wt. %, preferably from 0.2 to 10 wt. %.
[0041] Examples of antimycotic agents that may be included in the
composition according to the present invention are imidazole
derivatives and their salts; triazole derivatives and their salts;
pyridone derivatives like ciclopirox, octopirox and their salts;
polyene derivatives and their salts; allylamine derivatives like
terbinafine and their salts; morpholine derivatives like amorolfine
and their salts; bromsalan derivatives and their salts; nystatin
and related compounds; griseofulvin and related compounds;
chlorphenesin and related compounds; clodantoin and related
compounds; undecylenic acid and its salts and the antimycotic
agents disclosed in WO 02/07863A1.
[0042] These agents may be used in the respective amounts customary
in the art. They are usually employed in an amount from 0.1 to 15
wt. %.
[0043] Examples of antibiotic agents which may be listed in the
composition in accordance with the present invention include
aminoglycosides and their salts; antimycobacterials and their
salts; cephalosporins and related beta lactams and their salts;
chloramphenicol and related compounds; glycopeptides and their
salts; fusidane derivatives and their salts; lincosamides and their
salts; macrolides and their salts; mupirocin and related compounds;
nitrofuran derivatives and their salts; oxazolidinone derivatives
and their salts; penicillins and their salts; phosphonic acid
derivatives and their salts; polimixins and their salts;
polypeptide antibacterials and related compounds; quinolones and
their salts; sulfonamides and diaminopyrimidines and their salts;
tetracyclines and their salts.
[0044] These antibiotic agents may be used in the respective
amounts customary in the art. The antibiotic agents are usually
employed in an amount from 0.1 to 10 wt. %.
[0045] The anti-inflammatory agent which may be used in the
composition in accordance with the present invention include
steroidal and nonsteroidal anti-inflammatory agents.
[0046] Examples of steroidal anti-inflammatory agents include
21-acetoxypregnenolone, alclometasone or its dipropionate salt,
algestone, amcinonide, beclomethasone or its dipropionate salt,
betamethasone and salts thereof, including, for example,
betamethasone benzoate, betamethasone dipropionate, betamethasone
sodium phosphate, betamethasone sodium phosphate and acetate, and
betamethasone valerate; clobetasol or its propionate salt,
clocortolone pivalate, hydrocortisone and salts thereof, including,
for example, hydrocortisone acetate, hydrocortisone butyrate,
hydrocortisone cypionate, hydrocortisone phosphate, hydrocortisone
sodium phosphate, hydrocortisone sodium succinate, hydrocortisone
tebutate and hydrocortisone valerate; cortisone acetate,
budesonide, desonide, desoximetasone, dexamethasone and salts
thereof, for example, acetate and sodium phosphate; diflorasone
diacetate, fludrocortisone acetate, flunisoiide, fluocinolone
acetonide, fluocinonide, fluorometholone, flurandrenolide,
halcincnide, medrysone, methylprednisclone and salts thereof, e.g.
acetate, sodium succinate; mometasone furoate, paramethasone
acetate, prednisolone and salts thereof, e.g., acetate,
diethylaminoacetate, sodium phosphate, sodium succinate, tebutate,
trimethylacetate; prednisone, triamcinolone and derivates thereof,
e.g. acetonide, benetonide, diacetate, hexacetonide.
[0047] Examples of nonsteroidal antiinflammatory agents include
acetylsalicylic acid, buthylpyrazolidines and their salts; acetic
acid derivatives and their salts; oxicam derivatives and their
salts; propionic acid derivatives and their salts; phenamates and
their salts; coxibs and their salts; nimesulide and related
compounds.
[0048] These antiinflammatory agents may be used in the respective
amounts customary in the art. The anti-inflammatory agents are
usually employed in an amount from 0.1 to 5 wt. %.
[0049] Examples of antiseptic agents which may be used in the
composition in accordance with the present invention include
benzalkoniumchlorid, benzethoniumchlorid, cetrimoniumbromid,
chlorhexidin, dequaliniumchlorid, triclocarban, triclosan,
salicvlic acid, benzoic acid sorbic acid and their salts,
p-hydroxybenzoic acid and its esters.
[0050] These antiseptic agents may be used in the respective
amounts customary in the art. The antiseptic agents are usually
employed in an amount from 0.01 to 5 wt. %. examples of local
anaesthetic agents which may be used in the composition in
accordance with the present invention include benzocaine, butamben
and its picrate, piperocaine hydrochloride, oxybuprocaine
hydrochloride, tetracaine hydrochloride, lidocaine hydrochloride,
cinchocaine hydrochloride, oxetacaine, propiocaine hydrochloride,
bupivacaine hydrochloride, mepivacaine hydrochloride, dyclonine
hydrochloride, fomocaine hydrochloride, quinisocaine hydrochloride,
polydocanol and benzyl alcohol.
[0051] These local anaesthetic agents may be used in the respective
amounts customary in the art. The local anaesthetic agents are
usually employed in an amount from 0.3 to 10 wt. %.
[0052] In addition, the composition in accordance with the present
invention may contain other conventional additives customarily
present in cosmetic or medicinal nail lacquers, in particular
penetration enhancers. Penetration enhancers include any compound
known in the art which can enhance the penetration of the
pharmacologically active compound through the skin or through the
nail. In other words, the penetration enhancer improves the deep
diffusion of the drug. Suitable penetration enhancers include
salycilic acid, urea, monothioglycerol, N-acethylcysteine, ethyl
acetate, d-methyl sulphoxide (DMSO), dimethylacetamide and the
penetration enhancers disclosed in WO 99/39680. The penetration
enhancers may be used in an amount of 0 to 10 wt. %, preferably 0.1
to 8 wt. %, most preferably 1 to 5 wt. % by weight of the total
composition.
[0053] Other conventional additives customarily present in cosmetic
or medicinal nail formulatlons may include sedimentation retarders,
chelating agents, antioxidants, silicates, aroma substances,
wetting agents, lanolin derivates, light stabilizers and
antibacterial substances.
[0054] The composition in accordance to the present invention may
be prepared according to typical procedures normally employed in
the formulation field for liquid preparations, like solutions, nail
varnish, lotion or foam, or for semi-solid preparations, like cream
or gel. For liquid preparations, the at least one herb extract from
the genus Equisetum and the at least one water soluble film forming
agent may be brought into contact with a solvent or a mixture of
solvents and other liquid components either simultaneously or
separately by normal mixing techniques. No particular order of
addition of the respective ingredients is required. It is preferred
to provide stirring in order to ensure complete dissolution of the
ingredients. If any of the ingredients is in the solid form, it is
particularly preferred to add such an ingredient gradually to the
liquid components in order to prevent clumping.
[0055] For semi-solid preparations, the at least one herb extract
from the genus Equisetum and the at least one water soluble film
forming agent may be mixed with suitable excipients, like solvents,
emulsifyiers, surfactants and/or stiffening agents, either
simultaneously or separately by normal mixing techniques. It is
preferred to provide stirring under heating and surcharge the
solvent in order to avoid losses of evaporation.
[0056] The composition in accordance with the present invention is
applied as a film or as a thin layer on the nail surface in order
to prevent and/or treat specific alterations of the ungual
structure, like reduced strength, onychoschizia and ungual
brittleness. Usually, the composition will be applied repeatedly
over a period of several weeks or months, depending on the ungual
status. Generally the applied composition will contain sufficient
active principle to be diffused into the nail so that the
application should be repeated only once or twice per day in order
to ensure its effectiveness.
[0057] The preferred film forming agents of the present invention
show a surprising potentiation effect when employed with Equisetum
herb extracts. This effect is particularly pronounced with
hydroxyalkyl chitosans and carboxyalkyl chitosans.
[0058] While the film forming agents themselves do not show any
hardening or reconstructing effect of the nails when tested in
appropriate systems, the effect of the Equisetum itself is enhanced
when employed in combination with the film forming agents in the
present invention.
[0059] The composition of the present invention and its use as a
nail restructuring and hardening formulation is illustrated, but
not limited to, the following examples. All amounts in % are wt.
%
EXAMPLE 1
[0060] A nail lacquer formulation having the following composition
by weight is prepared: TABLE-US-00001 1. purified water 52.5% 2.
ethanol 40.0% 3. Equisetum glycolic extract 5.0% 4. hydroxypropyl
chitosan (HPCH) 1.0% 5. L-methionine 1.0% 6. diethyleneglycol
monomethylether 0.5%
[0061] The formulation was prepared by using a suitable closed
vessel provided with a stirrer. To this vessel were added ethanol,
deionized water and diethyleneglycol-monomethylether to form a
mixture. Thereafter, after dissolution thereof, Equisetum arvense
glycolic extract and L-methionine were added. Finally,
hydroxypropyl chitosan was added and the resulting mixture was
stirred for 24 hours or until dissolution.
[0062] The obtained nail lacquer composition had a clear and
homogeneous appearance and a yellowish color even after prolonged
storage. Moreover, the lacquer was able to form a matte, non-sticky
and plastic film which could strongly adhere to the nails. When
applied, the moisture and air permeable lacquer did not burn or
cause irritation on the adjacent skin or the periungual bed.
EXAMPLE 2
[0063] A nail lacquer formulation having the following composition
by weight is prepared: TABLE-US-00002 1. purified water 50.5% 2.
ethanol 40.0% 3. Equisetum glycolic extract 4.0% 4. aroma cherry
3.0% 5. hydroxypropyl chitosan (HPCH) 1.0% 6.
4-thiazolidinecarboxilic acid 1.0% 7. cetostearyl alcohol 0.5%
[0064] The formulation was prepared as shown in the Example 1 and
the resulting nail lacquer exhibited the same properties as
mentioned in Example 1.
EXAMPLE 3
[0065] A nail lacquer formulation having the following composition
by weight is prepared: TABLE-US-00003 1. purified water 51.0% 2.
ethanol 40.0% 3. Equisetum glycolic extract 5.0% 4. aroma Tropical
3.0% 5. hydroxypropyl chitosan (HPCH) 0.5% 6. ethyl acetate
0.5%
[0066] The formulation was prepared as shown in the Example 1 and
the resulting nail lacquer exhibited the same properties as
mentioned in Example 1.
EXAMPLE 4
[0067] A nail lacquer formulation having the following composition
by weight is prepared: TABLE-US-00004 1. purified water 52.5% 2.
ethanol 40.0% 3. Equisetum glycolic extract 5.0% 4. hydroxypropyl
chitosan (HPCH) 1.0% 5. methylsulphonylmethane 1.0% 6.
diethyleneglycol monomethylether 0.5%
[0068] The formulation was prepared as shown in the Example 1 and
the resulting nail lacquer exhibited the same properties as
mentioned in Example 1.
EXAMPLE 5
[0069] A nail lacquer formulation having the following composition
by weight is prepared: TABLE-US-00005 1. purified water 49.0% 2.
ethanol 40.0% 3. Equisetum glycolic extract 5.0% 4. aroma cherry
3.0% 5. carboxymethyl chitosan (HPCH) 1.0% 6.
methylsulphonylmethane 1.0% 7. cetostearyl alcohol 0.5% 8.
ethylacetate 0.5%
[0070] The formulation was prepared as shown in the Example 1 and
the resulting nail lacquer exhibited the same properties as
mentioned in Example 1.
EXAMPLE 6
[0071] A nail lacquer formulation having the following composition
by weight is prepared: TABLE-US-00006 1. purified water 49.0% 2.
ethanol 40.0% 3. Equisetum glycolic extract 5.0% 4. aroma cherry
3.0% 5. hydroxypropyl chitosan (HPCH) 1.0% 6. L-methionine 1.0% 7.
diethyleneglycol monomethylether 0.5%
[0072] The formulation was prepared as shown in the Example 1 and
the resulting nail lacquer exhibited the same properties as
mentioned in Example 1.
EXAMPLE 7
[0073] A cream formulation having the following composition by
weight is prepared: TABLE-US-00007 1. purified water 61.5% 2. cetyl
alcohol 5.5% 3. stearyl alcohol 5.5% 4. 2-octyldodecanol 5.5% 5.
Equisetum glycolic extract 5.0% 6. coconut fatty acid
diethanolamide 4.0% 7. vaseline album 3.5% 8. polysorbate 60 3.5%
9. light liquid paraffin 2.5% 10. sorbitanmonostearate 1.5% 11.
hydroxypropyl chitosan (HPCH) 1.0% 12. benzyl alcohol 1.0%
[0074] The formulation was prepared by using a suitable stainless
steel tank, provided with a thermosetting system and stirrer. To
this tank were added cetyl alcohol, stearyl alcohol,
2-octyldodecanol, coconut fatty acid diethanolamide, vaseline
album, polysorbate 60, light liquid paraffin, sorbitanionostearate
and benzyl alcohol. The mixture has been heated and maintained at
70-75.degree. C. under stirring conditions. Thereafter, Equisetum
arvense glycolic extract and hydroxypropyl chitosan were added
under stirring. Finally, water was added at 75-80.degree. C. and
stirred for 5 minutes. The water was surcharged by 10% to avoid
losses of evaporation. Then the mixture was cooled at 28-30.degree.
C. and unloaded in a stainless tank.
[0075] The obtained cream composition had a clear and homogeneous
appearance and a yellowish color even after prolonged storage. When
applied on the nails, the cream was able to form a plastic layer
which could strongly adhere to the nails, did not burn or cause
irritation on the adjacent skin or the periungual bed.
EXAMPLE 8
[0076] A foam formulation having the following composition by
weight is prepared: TABLE-US-00008 1. propylene glycol 60.3% 2.
purified water 30.0% 3. Equisetum glycolic extract 5.0% 4. coconut
fatty acid diethanolamide 3.5% 5. hydroxypropyl chitosan (HPCH)
1.0% 6. trimethylcetylammonium P-toluene sulfonate 0.2%
[0077] The formulation was prepared by using a suitable stainless
steel tank, provided with a stirrer. Equisetum extract was
dissolved in propylene glycol, then an aqueous solution containing
hydroxypropyl chitosan, trimethylacetyl ammonium p-toluenesulfonate
and coconut fatty acids diethanolamide were added. The mixture has
been maintained at 25-30.degree. C. under stirring conditions.
[0078] The above liquid, once put into the vessel equipped with the
appropriate device, supplied a soft and persisting foam, which
could be spread on the nails providing a matte film that strongly
adhered to the nail surface. The same result was achieved by using
the above composition with a gaseous propellant at ordinary
pressure or a liquid one at high pressure, such as isobutane in a
normal pressurized bottle.
EXAMPLE 9
[0079] A lotion formulation having the following composition by
weight is prepared: TABLE-US-00009 1. polyethylene glycol 400
93.89% 2. Equisetum glycolic extract 5.00% 3. hydroxypropyl
chitosan (HPCH) 1.00% 4. lactic acid 0.10% 5. buthylhydroxyanisole
0.01%
[0080] The formulation was prepared by using a suitable stainless
steel dissolution tank, provided with a stirrer and a
heating-cooling jacket. The polyethylene glycol has been heated up
to 32-35.degree. C. by forcing vapor through the heating jacket of
the dissolution tank. Then, while stirring, the ingredients have
been added and dissolved. Upon dissolution, the mixture has been
stirred for 3 hours to homogenize.
[0081] The above lotion, once put on the nails, provided a matte
film that strongly adhered to the nail surface.
EXAMPLE 10
[0082] A clinical study was carried out on 36 women with ungual
alterations like dystrophy, onycholysis, onychoschizia and ungual
brittleness as a result of previous ungual diseases (onychomycosis,
psoriasis, bacterial infections) or exogenous causes (chemical
agents, trauma, moisture) who volunteered to apply for 28 days a
composition obtained by the same method as that indicated in
Example 1. The study was randomized, controlled versus no treatment
within subjects. The product has been applied monolaterally once
daily, preferably on the night, on all the nails of one hand, on
the entire nail surface, for 28 consecutive days. The hand to be
treated was randomly assigned, the other hand served as the
untreated control.
[0083] The efficacy parameters according to the protocol have been
recorded at baseline and after 14 and 28 days. It included a
clinical assessment of the treated and untreated nails and the
casts of the thumb nails of both hands, made by silicon resin. The
casts have been analyzed by computerized optical prophylometry
according to a validated method. The longitudinal ridges have been
measured as average roughness score on the nail casts (Ra). The Ra
score was 10.96.+-.SD 2.58 at baseline, 9.46.+-.2.08 after 14 days
and 8.99.+-.1.72 after 28 days on the nails treated with the
composition according to Example 1. In mean, there was a decrease
by 14% at the intermediate evaluation time and a decrease by 18% at
the end of application. On the contrary, there was no change of
roughness on the untreated nails, whose Ra score were 9.78.+-.3.37
at baseline, 9.82.+-.3.31 after 14 days and 10.32.+-.3.4 at the end
of the observation period. The differences of the Ra scores at the
end compared to baseline between treated and untreated nails were
highly significant (p<0.001). The data are summarized in the
FIG. 1.
[0084] Among the clinical parameters, dystrophy, onycholysis,
onychoschizia and ungual brittleness have been measured by a
4-point semi quantitative scale. While there was no change in
dystrophy or onycholysis in either group, a definite improvement of
both onychoschizia and ungual brittleness was recorded in treated
nails, significantly better (p<0.001) for both parameters than
the results recorded in untreated nails.
[0085] The data are summarized in the table 1: TABLE-US-00010 TABLE
1 Clinical parameter assessment of day 21 compared to baseline on
treated nails and untreated controls Clinical untreated control
parameter treated nails nails onychoschizia 15% (no change) 91% (no
change) 70% (1 grade 9% (worsened) improvement) 15% (2 grade
improvement) ungual 30% (no change) 94% (no change) brittleness 67%
(1 grade 3% (1 grade improvement) improvement) 3% (2 grade 3%
(worsened) improvement) dystrophy 100% (no change) 100% (no change)
onycholysis 100% (no change) 100% (no change)
EXAMPLE 11
[0086] A clinical study was carried out on 60 women with
onychoschizia and ungual brittleness who volunteered to apply for 4
weeks a composition obtained by the same method as that indicated
in Example 1. The study was randomized, controlled, double blind,
parallel groups versus: [0087] a composition like that indicated in
Example 1, without Equisetum herb extract [0088] a composition like
that indicated in Example i, without hydroxypropyl chitosan
[0089] Every subject received one treatment, randomly assigned. The
product has been applied on the entire nail surfaces of both hands
once daily, preferably on the night, for 4 consecutive weeks.
[0090] The efficacy parameters according to the protocol have been
recorded at baseline and every week. They included a clinical
assessment of the nails, measuring onychoschizia and ungual
brittleness by means of a 5-point semi quantitative scale from
0=none to 4=very severe. At the end, the subject global impression
was also recorded, by means of the following scale: worsened; no
change; improvement; recovery. The results have been summarized in
the FIG. 2. Definite improvement of both onychoschizia and ungual
brittleness was recorded in nails of group 1, treated with the
composition obtained by the same method as that indicated in
Example 1. The improvement was significantly better of both those
recorded in the group 2, who applied a composition like that
indicated in Example 1, but different in that hydroxypropyl
chitosan was absent and in the group 3, who applied a composition
like that indicated in Example 1, but different in that Equisetum
herb extract was absent.
[0091] The subject global impression recorded at the end of the
study gave the results reported in table 2:
[0092] Table 2--Subject global impression after 4 weeks of
treatment with the composition according to the Example 1 (group
1), a composition like that indicated in Example 1, without
hydroxypropyl chitosan (group 2), and a composition like that
indicated in Example 1, without Equisetum herb extract (group 3):
p<0.001 between group 1 and group 2; p<0.001 between group 1
and group 3. TABLE-US-00011 worsened no change improvement revovery
Group n.degree. subjects n.degree. subjects n.degree. subjects
n.degree. subjects 1 0 0 12 8 2 1 8 11 0 3 0 14 6 0
* * * * *