U.S. patent application number 12/256615 was filed with the patent office on 2009-09-10 for phosphate-binding polymers for oral administration.
Invention is credited to Stephen Randall Holmes-Farley, W. Harry Mandeville, III, George M. Whitesides.
Application Number | 20090226392 12/256615 |
Document ID | / |
Family ID | 23872837 |
Filed Date | 2009-09-10 |
United States Patent
Application |
20090226392 |
Kind Code |
A1 |
Holmes-Farley; Stephen Randall ;
et al. |
September 10, 2009 |
Phosphate-Binding Polymers for Oral Administration
Abstract
Phosphate-binding polymers are provided for removing phosphate
from the gastrointestinal tract. The polymers are orally
administered, and are useful for the treatment of
hyperphosphatemia.
Inventors: |
Holmes-Farley; Stephen Randall;
(Arlington, MA) ; Mandeville, III; W. Harry;
(Lynnfield, MA) ; Whitesides; George M.; (Newton,
MA) |
Correspondence
Address: |
JONES DAY
222 EAST 41ST ST
NEW YORK
NY
10017
US
|
Family ID: |
23872837 |
Appl. No.: |
12/256615 |
Filed: |
October 23, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11295159 |
Dec 6, 2005 |
7459151 |
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12256615 |
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10766638 |
Jan 28, 2004 |
7014846 |
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11295159 |
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10322904 |
Dec 17, 2002 |
6858203 |
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10766638 |
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09542329 |
Apr 4, 2000 |
6509013 |
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10322904 |
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08929784 |
Sep 15, 1997 |
6083495 |
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09542329 |
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08471747 |
Jun 6, 1995 |
5667775 |
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08929784 |
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08238458 |
May 5, 1994 |
5496545 |
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08471747 |
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08105591 |
Aug 11, 1993 |
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08238458 |
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Current U.S.
Class: |
424/78.08 |
Current CPC
Class: |
A61K 31/662 20130101;
A61K 31/795 20130101; A61P 3/00 20180101; A61P 39/04 20180101; A61K
31/785 20130101 |
Class at
Publication: |
424/78.08 |
International
Class: |
A61K 31/785 20060101
A61K031/785; A61P 39/04 20060101 A61P039/04 |
Claims
1. A pharmaceutical composition comprising a carrier and a
crosslinked, water insoluble polyallylamine homopolymer, wherein
said polyallylamine homopolymer comprises repeat units represented
by the structural formula: ##STR00028## wherein n is an integer,
and wherein the homopolymer is fully protonated, partially
protonated or unprotonated.
2. The pharmaceutical composition of claim 1, wherein said
polyallylamine homopolymer is crosslinked with an epichlorohydrin
crosslinking agent.
3. The pharmaceutical composition of claim 2, wherein the amount of
said crosslinking agent is about 2% to about 20% by weight of the
polymer.
4. The pharmaceutical composition of claim 1, wherein said
polyallylamine homopolymer is fully or partially protonated.
5. The pharmaceutical composition of claim 4, wherein said
polyallylamine homopolymer is protonated with HCl.
6. The pharmaceutical composition of claim 5, wherein said
polyallylamine homopolymer is partially protonated.
7. The pharmaceutical composition of claim 1, wherein said
pharmaceutical composition consists essentially of one or more
carriers and said polyallylamine homopolymer.
8. The pharmaceutical composition of claim 1, wherein said
pharmaceutical composition consists of one or more carriers and
said polyallylamine homopolymer.
9. The pharmaceutical composition of claim 1, wherein said
pharmaceutical composition is in the form of a tablet or a
capsule.
10. A method for removing phosphate from a patient, comprising
orally administering to said patient a therapeutically effective
amount of a composition comprising a crosslinked, water insoluble
polyallylamine homopolymer, wherein said polyallylamine homopolymer
comprises repeat units represented by the structural formula:
##STR00029## wherein n is an integer, and wherein the homopolymer
is fully protonated, partially protonated or unprotonated.
11. The method of claim 10, wherein said polyallylamine homopolymer
is crosslinked with an epichlorohydrin crosslinking agent.
12. The method of claim 11, wherein the amount of said crosslinking
agent is about 2% to about 20% by weight of the polymer.
13. The method of claim 10, wherein said polyallylamine homopolymer
is fully or partially protonated.
14. The method of claim 13, wherein said polyallylamine homopolymer
is protonated with HCl.
15. The method of claim 14, wherein said polyallylamine homopolymer
is partially protonated.
Description
RELATED APPLICATIONS
[0001] This application is a continuation of Ser. No. 11/295,159
filed Dec. 6, 2005, now allowed, which is a continuation of Ser.
No. 10/766,638 filed Jan. 28, 2004, now U.S. Pat. No. 7,014,846,
which is a continuation of Ser. No. 10/322,904 filed Dec. 17, 2002,
now U.S. Pat. No. 6,858,203, which is a continuation of U.S. Ser.
No. 09/542,329, filed Apr. 4, 2000, now U.S. Pat. No. 6,509,013,
which is a continuation of U.S. Ser. No. 08/929,784, filed Dec. 15,
1997, now U.S. Pat. No. 6,083,495, which is a divisional of U.S.
Ser. No. 08/471,747 filed Jun. 6, 1995, now U.S. Pat. No. 5,667,775
which is a continuation-in-part of U.S. Ser. No. 08/238,458, filed
May 5, 1994, now U.S. Pat. No. 5,496,545, which is a
continuation-in-part of U.S. Ser. No. 08/105,591, filed Aug. 11,
1993, now abandoned, the entire teachings of which are incorporated
herein by reference.
BACKGROUND OF THE INVENTION
[0002] Hyperphosphatemia frequently accompanies diseases associated
with inadequate renal function, hypoparathyroidism, and certain
other medical conditions. Hyperphosphatemia is typically defined as
possessing a serum phosphate level of over about 6 mg/dL. The
condition, especially if present over extended periods of time,
leads to severe abnormalities in calcium and phosphorus metabolism
and can be manifested by aberrant calcification in joints, lungs,
and eyes.
[0003] Therapeutic efforts to reduce serum phosphate include
dialysis, reduction in dietary phosphate, and oral administration
of insoluble phosphate binders to reduce gastrointestinal
absorption. Dialysis and reduced dietary phosphate are generally
unsuccessful in adequately reversing hyperphosphatemia. Further
difficulties in these therapeutic regimens include the invasive
nature of dialysis and the difficulties in modifying dietary habits
in the latter therapy.
[0004] The oral administration of certain phosphate binders has
also been suggested. Phosphate binders include calcium or aluminum
salts. Calcium salts have been widely used to bind intestinal
phosphate and prevent absorption. The ingested calcium combines
with phosphate to form insoluble calcium phosphate salts such as
Ca.sub.3(PO.sub.4).sub.2, CaHPO.sub.4, or
Ca(H.sub.2PO.sub.4).sub.2. Different types of calcium salts,
including calcium carbonate, acetate (such as PhosLo.RTM. calcium
acetate tablets), citrate, alginate, and ketoacid salts have been
utilized for phosphate binding. This class of therapeutics
generally results in hypercalcemia due from absorption of high
amounts of ingested calcium. Hypercalcemia has been indicated in
many serious side effects, such as cardiac arrhythmias, renal
failure, and skin and visceral calcification. Frequent monitoring
of serum calcium levels is required during therapy with
calcium-based phosphate binders.
[0005] Aluminum-based phosphate binders, such as Amphojel.RTM.
aluminum hydroxide gel, have also been used for treating
hyperphosphatemia. These compounds complex with intestinal
phosphate to form highly insoluble aluminum phosphate; the bound
phosphate is unavailable for absorption by the patient. Prolonged
use of aluminum gels leads to accumulations of aluminum, and often
to aluminum toxicity, accompanied by such symptoms as
encephalopathy, osteomalacia, and myopathy.
[0006] Selected ion exchange resins have also been suggested for
use in binding phosphate. Those tested include Dowex.RTM.
anion-exchange resins in the chloride form, such as XF 43311, XY
40013, XF 43254, XY 40011, and XY 40012. These resins have several
drawbacks for treatment of hyperphosphatemia, including poor
binding efficiency, necessitating use of high dosages for
significant reduction of absorbed phosphate.
[0007] Thus a need exists for improved phosphate binders which can
be administered orally in acceptable dosage levels without
resulting in many of the serious side effects discussed above.
SUMMARY OF THE INVENTION
[0008] The invention relates to the discovery that a class of anion
exchange polymers have improved phosphate binding properties. In
general, the invention features a method of removing phosphate from
a patient by ion exchange, which involves oral administration of a
therapeutically effective amount of a composition containing at
least one phosphate-binding polymer. The polymers of the invention
may be crosslinked with a crosslinking agent.
[0009] The invention provides an effective treatment for decreasing
the serum level of phosphate by binding phosphate in the
gastrointestinal tract, without comcomittantly increasing the
absorption of any clinically undesirable materials, particularly
calcium or aluminum.
[0010] Other features and advantages will be apparent from the
following description of the preferred embodiments and from the
claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is an illustration of the bound phosphate relevant to
solution phosphate concentration after a phosphate solution is
treated with poly(dimethylaminopropyl-acrylamide).
[0012] FIG. 2 is a graphic illustration of the phosphate
concentration in fecal samples taken from rats fed with a dietary
supplement of a crosslinked polyallylamine and micro-crystalline
cellulose (placebo).
[0013] FIG. 3 is a graphic illustration of the urinary phosphate
concentration in rats similarly given a dietary supplement of a
crosslinked polyallylamine and micro-crystalline cellulose
(placebo).
DETAILED DESCRIPTION OF THE INVENTION
[0014] A description of preferred embodiments of the invention
follows.
[0015] The polymers of the invention generally include hydrophilic
anion exchange resins, particularly aliphatic amine polymers. The
"amine" group can be present in the form of a primary, secondary or
tertiary amine, quaternary ammonium salt, amidine, guanadine,
hydrazine, or combinations thereof. The amine can be within the
linear structure of the polymer (such as in polyethylenimine or a
condensation polymer of a polyaminoalkane, e.g. diethylenetriamine,
and a crosslinking agent, such as epichlorohydrin) or as a
functional group pendant from the polymer backbone (such as in
polyallylamine, polyvinylamine or poly(aminoethyl)acrylate).
[0016] In one aspect, the polymer is characterized by a repeating
unit having the formula
##STR00001##
or a copolymer thereof, wherein n is an integer and each R,
independently, is H or a substituted or unsubstituted alkyl, such
as a lower alkyl (e.g., having between 1 and 5 carbon atoms,
inclusive), alkylamino (e.g., having between 1 and 5 carbons atoms,
inclusive, such as ethylamino) or aryl (e.g., phenyl) group.
[0017] In a second aspect, the polymer is characterized by a
repeating unit having the formula
##STR00002##
or a copolymer thereof, wherein n is an integer, each R,
independently, is H or a substituted or unsubstituted alkyl (e.g.,
having between 1 and 5 carbon atoms, inclusive), alkylamino (e.g.,
having between 1 and 5 carbons atoms, inclusive, such as
ethylamino) or aryl (e.g., phenyl) group, and each X.sup.- is an
exchangeable negatively charged counterion.
[0018] One example of a copolymer according to the second aspect of
the invention is characterized by a first repeating unit having the
formula
##STR00003##
wherein n is an integer, each R, independently, is H or a
substituted or unsubstituted alkyl (e.g., having between 1 and 5
carbon atoms, inclusive), alkylamino (e.g., having between 1 and 5
carbons atoms, inclusive, such as ethylamino) or aryl group (e.g.,
phenyl), and each X.sup.- is an exchangeable negatively charged
counterion; and further characterized by a second repeating unit
having the formula
##STR00004##
wherein each n, independently, is an integer and each R,
independently, is H or a substituted or unsubstituted alkyl (e.g.,
having between 1 and 5 carbon atoms, inclusive), alkylamino (e.g.,
having between 1 and 5 carbons atoms, inclusive, such as
ethylamino) or aryl group (e.g., phenyl).
[0019] In a fourth aspect, the polymer is characterized by a
repeating unit having the formula
##STR00005##
or a copolymer thereof, wherein n is an integer, and R is H or a
substituted or unsubstituted alkyl (e.g., having between 1 and 5
carbon atoms, inclusive), alkylamino (e.g., having between 1 and 5
carbons atoms, inclusive, such as ethylamino) or aryl group (e.g.,
phenyl).
[0020] One example of a copolymer according to the second aspect of
the invention is characterized by a first repeating unit having the
formula
##STR00006##
wherein n is an integer, and R is H or a substituted or
unsubstituted alkyl (e.g., having between 1 and 5 carbon atoms,
inclusive), alkylamino (e.g., having between 1 and 5 carbons atoms,
inclusive, such as ethylamino) or aryl group (e.g., phenyl); and
further characterized by a second repeating unit having the
formula
##STR00007##
wherein each n, independently, is an integer and R is H or a
substituted or unsubstituted alkyl (e.g., having between 1 and 5
carbon atoms, inclusive), alkylamino (e.g., having between 1 and 5
carbon atoms, inclusive, such as ethylamino) or aryl group (e.g.,
phenyl).
[0021] In a fifth aspect, the polymer is characterized by a
repeating group having the formula
##STR00008##
or a copolymer thereof, wherein n is an integer, and each R.sub.1
and R.sub.2, independently, is H or a substituted or unsubstituted
alkyl (e.g., having between 1 and 5 carbon atoms, inclusive), and
alkylamino (e.g., having between 1 and 5 carbons atoms, inclusive,
such as ethylamino) or aryl group (e.g., phenyl), and each X.sup.-
is an exchangeable negatively charged counterion.
[0022] In one preferred polymer according to the fifth aspect of
the invention, at least one of the R groups is a hydrogen atom.
[0023] In a sixth aspect, the polymer is characterized by a repeat
unit having the formula
##STR00009##
or a copolymer thereof, where n is an integer, each R.sub.1 and
R.sub.2, independently, is H, a substituted or unsubstituted alkyl
group containing 1 to 20 carbon atoms, an alkylamino group (e.g.,
having between 1 and 5 carbons atoms, inclusive, such as
ethylamino), or an aryl group containing 6 to 12 atoms (e.g.,
phenyl).
[0024] In a seventh aspect, the polymer is characterized by a
repeat unit having the formula
##STR00010##
or a copolymer thereof, wherein n is an integer, each R.sub.1,
R.sub.2 and R.sub.3, independently, is H, a substituted or
unsubstituted alkyl group containing 1 to 20 carbon atoms, an
alkylamino group (e.g., having between 1 and 5 carbons atoms,
inclusive, such as ethylamino), or an aryl group containing 6 to 12
atoms (e.g., phenyl), and each X.sup.- is an exchangeable
negatively charged counterion.
[0025] In each case, the R groups can carry one or more
substituents. Suitable substituents include therapeutic anionic
groups, e.g., quaternary ammonium groups, or amine groups, e.g.,
primary and secondary alkyl or aryl amines. Examples of other
suitable substituents include hydroxy, alkoxy, carboxamide,
sulfonamide, halogen, alkyl, aryl, hydrazine, guanadine, urea, and
carboxylic acid esters, for example.
[0026] The polymers are preferably crosslinked, in some cases by
adding a crosslinking agent to the reaction mixture during or after
polymerization. Examples of suitable crosslinking agents are
diacrylates and dimethacrylates (e.g., ethylene glycol diacrylate,
propylene glycol diacrylate, butylene glycol diacrylate, ethylene
glycol dimethacrylate, propylene glycol dimethacrylate, butylene
glycol dimethacrylate, polyethyleneglycol dimethacrylate,
polyethyleneglycol diacrylate), methylene bisacrylamide, methylene
bismethacrylamide, ethylene bisacrylamide, epichlorohydrin,
epibromohydrin, toluene diisocyanate, ethylenebismethacrylamide,
ethylidene bisacrylamide, divinyl benzene, bisphenol A
dimethacrylate, bisphenol A diacrylate, 1,4 butanedioldiglycidyl
ether, 1,2 ethanedioldiglycidyl ether, 1,3-dichloropropane,
1,2-dichloroethane, 1,3-dibromopropane, 1,2-dibromoethane, succinyl
dichloride, dimethylsuccinate, acryloyl chloride, or pyromellitic
dianhydride.
[0027] The amount of crosslinking agent is typically between about
0.5 and about 75 weight %, and preferably between about 1 and about
25% by weight, based upon the combined weight of crosslinking and
monomer. In another embodiment, the crosslinking agent is present
between about 2 and about 20% by weight of polymer.
[0028] In some cases the polymers are crosslinked after
polymerization. One method of obtaining such crosslinking involves
reaction of the polymer with difunctional crosslinkers, such as
epichlorohydrin, succinyl dichloride, the diglycidyl ether of
bisphenol A, pyromellitic dianhydride, toluene diisocyanate, and
ethylenediamine. A typical example is the reaction of
poly(ethyleneimine) with epichlorohydrin. In this example the
epichlorohydrin (1 to 100 parts) is added to a solution containing
polyethyleneimine (100 parts) and heated to promote reaction. Other
methods of inducing crosslinking on already polymerized materials
include, but are not limited to, exposure to ionizing radiation,
ultraviolet radiation, electron beams, radicals, and pyrolysis.
[0029] Examples of preferred crosslinking agents include
epichlorohydrin, 1,4 butanedioldiglycidyl ether, 1,2
ethanedioldiglycidyl ether, 1,3-dichloropropane,
1,2-dichloroethane, 1,3-dibromopropane, 1,2-dibromoethane, succinyl
dichloride, dimethylsuccinate, toluene diisocyanate, acryloyl
chloride, and pyromellitic dianhydride.
[0030] The negatively charged counterions, X.sup.-, can be organic
ions, inorganic ions, or a combination thereof. The inorganic ions
suitable for use in this invention include halide (especially
chloride), carbonate, bicarbonate, sulfate, bisulfate, hydroxide,
nitrate, persulfate and sulfite. Suitable organic ions include
acetate, ascorbate, benzoate, citrate, dihydrogen citrate, hydrogen
citrate, oxalate, succinate, tartrate, taurocholate, glycocholate,
and cholate.
[0031] In a preferred embodiment, the counterion does not have a
detrimental side effect to the patient but rather is selected to
have a therapeutic or nutritional benefit to the patient.
EXAMPLES
[0032] Candidate polymers were tested by stirring them in a
phosphate containing solution at pH 7 for 3 hours. The solution was
designed to mimic the conditions present in the small
intestine.
TABLE-US-00001 Solution Contents 10-20 mM Phosphate 80 mM Sodium
Chloride 30 mM Sodium Carbonate
[0033] The pH was adjusted to pH 7, once at the start of the test
and again at the end of the test, using either aqueous NaOH or HCl.
After 3 hours the polymer was filtered off and the residual
phosphate concentration in the test solution was determined
spectrophotometrically. The difference between the initial
phosphate concentration and the final concentration was used to
determine the amount of phosphate bound to the polymer. This result
is expressed in milliequivalents per gram of starting polymer
(meq/g).
[0034] Table 1 below shows the results obtained for several
polymers. Higher numbers indicate a more effective polymer.
TABLE-US-00002 TABLE 1 Phosphate Bound Polymer (meq/g)*
Poly(allylamine/epichlorohydrin) 3.1 Poly(allylamine/butanediol
diglycidyl ether) 2.7 Poly(allylamine/ethanediol diglycidyl ether)
2.3 Poly(allyltrimethylammonium chloride) 0.3
Poly(ethyleneimine)/acryloyl chloride 1.2 Polyethyleneimine "C" 2.7
Polyethyleneimine "A" 2.2 Poly(DET/EPI) 1.5 Polyethyleneimine "B"
1.2 Poly(dimethylaminopropylacrylamide) 0.8 Poly(PEH/EPI) 0.7
Poly(trimethylammoniomethyl styrene chloride) 0.7
Poly(pentaethylenehexaminemethacrylamide) 0.7
Poly(tetraethylenepentaminemethacrylamide) 0.7
Poly(diethylenetriaminemethacrylamide) 0.5
Poly(triethylenetetraminemethacrylamide) 0.5
Poly(aminoethylmethacrylamide) 0.4 Poly(vinylamine) 0.4
Poly(MAPTAC) 0.24 Poly(methylmethacrylate/PEI) 0.2
Poly(dimethylethyleneimine chloride) 0.2
Poly(diethylaminopropylmethacrylamide) 0.1
Poly(guanidinoacrylamide) 0.1 Poly(guanidinobutylacrylamide) 0.1
Poly(guanidinobutylmethacrylamide) 0.1 *The values apply when the
residual solution phosphate levels are ~5 mM.
[0035] Table 2 shows results obtained using various other materials
to bind phosphate.
TABLE-US-00003 TABLE 2 Phosphate Bound Polymer (meq/g)* Calcium
Chloride 4.0 Calcium Lactate 2.4 Ox-Absorb .RTM. 0.5 Maalox Plus
.RTM. 0.3 Sephadex DEAE A-25, 40-125 m 0.2 Aluminum Hydroxide,
Dried Gel 0.2 *The values apply when the residual solution
phosphate levels are ~5 mM.
[0036] Table 3 shows results obtained for a variety of salts made
from polyethyleneimine and organic and inorganic acids.
TABLE-US-00004 TABLE 3 Phosphate Bound Polymer (meq/g)*
Poly(ethyleneimine sulfate A) 0.9 Poly(ethyleneimine sulfate B) 1.2
Poly(ethyleneimine sulfate C) 1.1 Poly(ethyleneimine sulfate D) 1.7
Poly(ethyleneimine tartrate A) 0.7 Poly(ethyleneimine tartrate B)
0.9 Poly(ethyleneimine tartrate C) 1.1 Poly(ethyleneimine ascorbate
A) 0.55 Poly(ethyleneimine ascorbate B) 0.65 Poly(ethyleneimine
ascorbate C) 0.9 Poly(ethyleneimine citrate A) 0.7
Poly(ethyleneimine citrate B) 1.0 Poly(ethyleneimine citrate C) 0.9
Poly(ethyleneimine succinate A) 1.1 Poly(ethyleneimine succinate B)
1.3 Poly(ethyleneimine chloride) 1.1 *The values apply when the
residual solution phosphate levels are ~5 mM.
[0037] Oxabsorb.RTM. is an organic polymer that encapsulates
calcium such that the calcium is available to bind to such ions as
phosphate, but may not be released by the polymer and thus is not
supposed to be absorbed by the patient.
[0038] The amount of phosphate bound by all of these materials,
both polymers and inorganic gels, is expected to vary as the
phosphate concentration varies. The graph FIG. 1 below shows the
relationship between the solution phosphate concentration and the
amount of phosphate bound to poly(dimethylaminopropylacrylamide).
Other polymers of the class are expected to show a similar
relationship.
[0039] In an alternate type of test, the polymer was exposed to an
acidic environment prior to exposure to phosphate as might happen
in a patient's stomach. The solid (0.1 g) was suspended in 40 mL of
0.1 M NaCl. This mixture was stirred for 10 minutes, and the pH was
adjusted to 3.0 with 1 M HCl, and the mixture was stirred for 30
minutes. The mixture was centrifuged, the supernatant decanted, and
the solid resuspended in 40 mL of 0.1 m NaCl. This mixture was
stirred for 10 minutes, the pH was adjusted to 3.0 with 1 M HCl,
and the mixture was stirred for 30 minutes. The mixture was
centrifuged, the supernatant decanted, and the solid residue used
in the usual phosphate assay. Results are shown in Table 4 for a
variety of polymers and for aluminum hydroxide dried gel. In most
cases the values for the amount of phosphate bound are higher in
this test than in the usual assay.
TABLE-US-00005 TABLE 4 Phosphate Bound Polymer (meq/g)*
Poly(ethyleneimine sulfate B) 1.2 Poly(ethyleneimine sulfate C) 1.3
Poly(ethyleneimine tartrate B) 1.3 Poly(ethyleneimine tartrate C)
1.4 Poly(ethyleneimine ascorbate B) 1.0 Poly(ethyleneimine
ascorbate C) 1.0 Poly(ethyleneimine citrate B) 1.0
Poly(ethyleneimine citrate C) 1.3 Poly(ethyleneimine succinate A)
1.1 Poly(ethyleneimine succinate B) 1.3 Poly(ethyleneimine
chloride) 1.4 Aluminum Hydroxide 0.7 *The values apply when the
residual solution phosphate levels are ~5 mM.
Rat Dietary Phosphorus Excretion Model
[0040] Six 6-8 week old Sprague-Dawley rats were placed in
metabolic cages and fed semi-purified rodent chow powder containing
0.28% inorganic phosphorus. The diets were supplemented with 1.7%
poly(allylamine/epichlorohydrin) or micro-crystalline cellulose;
the animals served as their own controls by receiving cellulose or
poly(allylamine/epichlorohydrin) in randomized order. The rats were
fed ad libitum for three days to acclimate to the diet. Feces
excreted during the next 48 hours were collected, lyophilized, and
ground into powder. The inorganic phosphate content was determined
according to the method of Taussky and Shorr: Microdetermination of
Inorganic Phosphate. One gram of powdered feces was burned to
remove carbon, then ashed in a 600.degree. C. oven. Concentrated
HCl was then added to dissolve the phosphorus. The phosphorus was
determined with ferrous sulfate-ammonium molybdate reagent.
Intensity of the blue color was determined at 700 nm on a
Perkin-Elmer spectrophotometer through a 1 cm cell.
[0041] The results are shown in FIG. 2. Fecal phosphate
concentration increased in all animals.
Urinary Phosphate Excretion in Partially Nephrectomized Rats
[0042] Sprague-Dawley rats, approximately 8 weeks old, were 75%
nephrectomized. One kidney was surgically removed; approximately
50% of the renal artery flow to the contralateral kidney was
ligated. The animals were fed a semi-purified rodent chow
containing 0.385% inorganic phosphorus and either 10%
poly(allylamine/epichlorohydrin) or cellulose. Urine was collected
and analyzed for phosphate content on specific days. Absorbed
dietary phosphate is excreted into the urine to maintain serum
phosphate.
[0043] The results are shown in FIG. 3. None of the animals became
hyperphosphatemic or uremic, indicating that the residual kidney
function was adequate to filter the absorbed phosphate load. The
animals receiving the poly(allylamine/epichlorohydrin) demonstrated
a trend towards reduced phosphate excretion, indicative of reduced
phosphate absorption.
syntheses Poly(allylamine hydrochloride)--To a 5 L, water jacketed
reaction kettle equipped with 1) a condenser topped with a nitrogen
gas inlet and 2) a thermometer and 3) a mechanical stirrer was
added concentrated hydrochloric acid (2590 mL). The acid was cooled
to 5.degree. C. using circulating water in the jacket of the
reaction kettle at 0.degree. C. Allylamine (2362 mL; 1798 g) was
added dropwise with stirring, maintaining a temperature of
5-10.degree. C. After the addition was complete, 1338 mL of liquid
was removed by vacuum distillation at 60-70.degree. C.
Azobis(amidinopropane) dihydrochloride (36 g) suspended in 81 mL
water was added. The kettle was heated to 50.degree. C. under a
nitrogen atmosphere with stirring for 24 hours.
Azobis(amidinopropane) dihydrochloride (36 g) suspended in 81 mL
water was again added and the heating and stirring continued for an
additional 44 hours. Distilled water (720 mL) was added and the
solution allowed to cool with stirring. The liquid was added
dropwise to a stirring solution of methanol (30 L). The solid was
then removed by filtration, resuspended in methanol (30 L), stirred
1 hour, and collected by filtration. This methanol rinse was
repeated once more and the solid was dried in a vacuum oven to
yield 2691 g of a granular white solid (poly(allylamine
hydrochloride). Poly(allylamine/epichlorohydrin)--To a 5 gallon
bucket was added poly(allylamine hydrochloride) (2.5 kg) and water
10 L). The mixture was stirred to dissolve and the pH was adjusted
to 10 with a solid NaOH. The solution was allowed to cool to room
temperature in the bucket and epichlorohydrin (250 mL) was added
all at once with stirring. The mixture was stirred gently until it
gelled after about 15 minutes. The gel was allowed to continue
curing for 18 hours at room temperature. The gel was then removed
and put into a blender with isopropanol (about 7.5 L). The gel was
mixed in the blender with about 500 mL isopropanol for .about.3
minutes to form coarse particles and the solid was then collected
by filtration. The solid was rinsed three times by suspending it in
9 gallons of water, stirring the mixture for 1 hour, and collecting
the solid by filtration. The solid was rinsed once by suspending it
in isopropanol (60 L), stirring the mixture for 1 hour, and
collecting the solid by filtration. The solid was dried in a vacuum
oven for 18 hours to yield 1.55 Kg of a granular, brittle, white
solid. Poly(allylamine/butanedioldiglycidyl ether)--To a 5 gallon
plastic bucket was added poly(allylamine hydrochloride) (500 g) and
water (2 L). The mixture was stirred to dissolve and the pH was
adjusted to 10 with solid NaOH (142.3 g). The solution was allowed
to cool to room temperature in the bucket and
1,4-butanedioldiglycidyl ether (130 mL) was added all at once with
stirring. The mixture was stirred gently until it gelled after 4
minutes. The gel was allowed to continue curing for 18 hours at
room temperature. The gel was then removed and dried in a vacuum
oven at 75.degree. C. for 24 hours. The dry solid was ground and
sieved for -30 mesh and then suspended in 6 gallons on water. After
stirring for 1 hour the solid was filtered off and rinse process
repeated twice more. The solid was rinsed twice in isopropanol (3
gallons), and dried in a vacuum oven at 50.degree. C. for 24 hours
to yield 580 g of a white solid.
Poly(allylamine/ethanedioldiglycidyl ether)--To a 100 mL beaker was
added poly(allylamine hydrochloride) (10 g) and water (40 mL). The
mixture was stirred to dissolve and the pH was adjusted to 10 with
solid NaOH. The solution was allowed to cool to room temperature in
the beaker and 1,2 ethanedioldiglycidyl ether (2.0 mL) was added
all at once with stirring. The mixture was allowed to continue
curing for 18 hours at room temperature. The gel was then removed
and blended in 500 mL of methanol. The solid was filtered off and
suspended in water (500 mL). After stirring for 1 hour the solid
was filtered off and the rising process repeated. The solid was
rinsed twice in isopropanol (400 mL), and dried in a vacuum oven at
50.degree. C. for 24 hours to yield 8.7 g of a white solid.
Poly(allylamine/dimethylsuccinate)--To a 500 mL round bottom flask
was added poly(allylamine hydrochloride) (10 g), methanol (100 mL),
and triethylamine (10 mL). The mixture was stirred and
dimethylsuccinate (1 mL) was added. The solution was heated to
reflux and stirring turned off after 30 minutes. After 18 hours the
solution was cooled to room temperature and solid was filtered off
and suspended in water (1 L). After stirring for 1 hour the solid
was filtered off and the rinse process repeated twice more. The
solid was rinsed once in isopropanol (800 mL), and dried in a
vacuum oven at 50.degree. C. for 24 hours to yield 5.9 g of a white
solid. Poly(allyltrimethylammonium chloride)--To a 500 mL three
necked flask equipped with a magnetic stirrer, a thermometer, and a
condenser topped with a nitrogen inlet, was added poly(allylamine)
crosslinked with epichlorohydrin (5.0 g), methanol (300 mL), methyl
iodide (20 mL), and sodium carbonate (50 g). The mixture was then
cooled and water was added to total volume of 2 L. Concentrated
hydrochloric acid was added until no further bubbling resulted and
the remaining solid was filtered off. The solid was rinsed twice in
10% aqueous NaCl (1 L) by stirring for 1 hour followed by
filtration to recover the solid. The solid was then rinsed three
times by suspending it in water (2 L), stirring for 1 hour, and
filtering to recover the solid. Finally, the solid was rinsed as
above in methanol and dried in a vacuum over at 50.degree. C. for
18 hours to yield 7.7 g of white granular solid.
Poly(ethyleneimine)/acryloyl chloride--Into a 5 L three neck flask
equipped with a mechanical stirrer, a thermometer, and an
additional funnel was added polyethyleneimine (510 g of a 50%
aqueous solution (equivalent to 255 g of dry polymer) and
isopropanol (2.5 L). Acryloyl chloride (50 g) was added dropwise
through the addition funnel over a 35 minute period, keeping the
temperature below 29.degree. C. The solution was then heated to
60.degree. C. with stirring for 18 hours. The solution was cooled
and solid immediately filtered off. The solid was rinsed three
times by suspending it in water (2 gallons), stirring for 1 hour,
and filtering to recover the solid. The solid was rinsed once by
suspending it in methanol (2 gallons), stirring for 30 minutes, and
filtering to recover the solid. Finally, the solid was rinsed as
above in isopropanol and dried in a vacuum over at 50.degree. C.
for 18 hours to yield 206 g of light orange granular solid.
##STR00011##
Poly(dimethylaminopropylacrylamide)--Dimethylamino-propylacrylamide
(10 g) and methylene-bisacrylamide (1.1 g) were dissolved in 50 mL
of water in a 100 mL three neck flask. The solution was stirred
under nitrogen for 10 minutes. Potassium persulfate (0.3 g) and
sodium metabisulfite (0.3 g) were each dissolved in 2-3 mL of water
and then mixed. After a few seconds this solution was added to the
monomer solution, still under nitrogen. A gel formed immediately
and was allowed to sit overnight. The gel was removed and blended
with 500 mL of isopropanol. The solid was filtered off and rinsed
three times with acetone. The solid white powder was filtered off
and dried in a vacuum oven to yield 6.1 g.
##STR00012##
Poly(Methacrylamidopropyltrimethylammoniumchloride)=[Poly
(MAPTAC)]--[3-(Methacryloylamino)propyl]trimethylammonium chloride
(38 mL of 50% aqueous solution) and methylenebis-methacrylamide
(2.2 g) were stirred in a beaker at room temperature. Methanol (10
mL was added and the solution was warmed to 40.degree. C. to fully
dissolve the bisacrylamide. Potassium persulfate (0.4 g) was added
and the solution stirred for 2 minutes. Potassium metabisulfite
(0.4 g) was added and stirring was continued. After 5 minutes the
solution was put under a nitrogen atmosphere. After 20 minutes the
solution contained significant precipitate and the solution was
allowed to sit overnight. The solid was washed three times with
isopropanol and collected by filtration. The solid was then
suspended in water 500 (mL) and stirred for several hours before
being collected by centrifugation. The solid was again washed with
water and collected by filtration. The solid was then dried in a
vacuum oven to yield 21.96 g.
##STR00013##
Poly(ethyleneimine) "A"--Polyethyleneimine (50 g of a 50% aqueous
solution; Scientific Polymer Products) was dissolved in water (100
mL). Epichlorohydrin (4.6 mL) was added dropwise. The solution was
heated to 55.degree. C. for 4 hours, after which it had gelled. The
gel was removed, blended with water (1 L) and the solid was
filtered off. It was resuspended in water (2 L) and stirred for 10
minutes. The solid was filtered off, the rinse repeated once with
water and twice with isopropanol, and the resulting gel was dried
in a vacuum oven to yield 26.3 g of a rubbery solid.
Poly(ethyleneimine) "B" and Poly(ethyleneimine) "C" were made in a
similar manner, except using 9.2 and 2.3 mL of epichlorohydrin,
respectively.
Poly(methylmethacrylate-co-divinylbenzene)--Methylmeth-acrylate (50
g) and divinylbenzene (5 g) and azobisiso-butyronitrile (1.0 g)
were dissolved in isopropanol (500 mL) and heated to reflux for 18
hours under a nitrogen 14 atmosphere. The solid white precipitate
was filtered off, rinsed once in acetone (collected by
centrifugation), once in water (collected by filtration and dried
in a vacuum oven to yield 19.4 g.
##STR00014##
Poly(diethylenetriaminemethacrylamide)--Poly(methyl-methacrylate-co-divin-
ylbenzene) (20 g) was suspended in diethylenetriamine (200 mL) and
heated to reflux under a nitrogen atmosphere for 18 hours. The
solid was collected by filtration, resuspended in water (500 mL),
stirred 30 minutes, filtered off, resuspended in water (500 mL),
stirred 30 minutes, filtered off, rinsed briefly in isopropanol,
and dried in a vacuum oven to yield 18.0 g.
##STR00015##
Poly(pentaethylenehexaminemethacrylamide),
Poly(tetraethylenepentaminemethacrylamide), and
Poly(triethylenetetraaminemethacrylamide) were made in a manner
similar to poly(diethylenetriaminemethacrylamide) from
pentaethylenehexamine, tetraethylenepentamine, and
triethylenetetraamine, respectively.
Poly(methylmethacrylate/PEI)--Poly(methylmethacrylate-co-divinylbenzene)--
(1.0 g) was added to a mixture containing hexanol (9150 mL) and
polyethyleneimine (15 g in 15 g water). The mixture was heated to
reflux under nitrogen for 4 days. The reaction was cooled and the
solid was filtered off, suspended in methanol (300 mL), stirred 1
hour, and filtered off. The rinse was repeated once with
isopropanol and the solid was dried in a vacuum oven to yield 0.71
g.
##STR00016##
Poly(aminoethylmethacrylamide)--Poly(methylmethacrylate-co-divinylbenzene-
) (20 g) was suspended in ethylenediamine 9200 mL) and heated to
reflux under a nitrogen atmosphere for 3 days. The solid was
collected by centrifugation, washed by resuspending it in water
(500 mL), stirring for 30 minutes, and filtering off the solid. The
solid was washed twice more in water, once in isopropanol, and
dried in a vacuum oven to yield 17.3 g.
##STR00017##
Poly(diethylaminopropylmethacrylamide)--Poly(methyl-methacrylate-co-divin-
ylbenzene) (20 g) was suspended in diethylaminopropylamine (200 mL)
and heated to reflux under a nitrogen atmosphere for 18 hours. The
solid was collected by filtration, resuspended in water (500 mL),
filtered off, resuspended in water (500 mL), collected by
filtration, rinsed briefly in isopropanol, and dried in a vacuum
oven to yield 8.2 g.
##STR00018##
NHS-acrylate--N-Hydroxysuccinimide (NHS, 157.5 g) was dissolved in
chloroform (2300 mL) in a 5 L flask. The solution was cooled to
0.degree. C. and acryloyl chloride (132 g) was added dropwise,
keeping the temperature 2.degree. C. After addition was complete,
the solution was stirred for 1.5 hours, rinsed with water (1100 mL)
in a separatory funnel and dried over anhydrous sodium sulfate. The
solvent was removed under vacuum and a small amount of ethyl
acetate was added to the residue. This mixture was poured into
hexane (200 mL) with stirring. The solution was heated to reflux,
adding more ethyl acetate (400 mL). The insoluble NHS was filtered
off, hexane (1 L) was added, the solution was heated to reflux,
ethyl acetate (400 mL) was added, and the solution allowed to cool
to <10.degree. C. The solid was then filtered off and dried in a
vacuum oven to yield 125.9 g. A second crop of 80 g was
subsequently collected by further cooling.
##STR00019##
Poly(NHS-acrylate)--NHS-acrylate (28.5 g), methylenebis-acrylamide
(1.5 g) and tetrahydrofuran (500 mL) were mixed in a 1 L flask and
heated to 50.degree. C. under a nitrogen atmosphere.
Azobisisobutyronitrile (0.2 g) was added, the solution was stirred
for 1 hour, filtered to remove excess N-hydroxysuccinimide, and
heated to 50.degree. C. for 4.5 hours under a nitrogen atmosphere.
The solution was then cooled and the solid was filtered off, rinsed
in tetrahydrofuran, aid dried in a vacuum oven to yield 16.1 g.
##STR00020##
Poly(guanidinobutylacrylamide)--Poly(NHS-acrylate) (1.5 g) was
suspended in water (25 mL) containing agmatine (1.5 g) which had
been adjusted to pH 9 with solid NaOH. The solution was stirred for
4 days, after which time the pH had dropped to 6.3. Water was added
to a total of 500 mL, the solution was stirred for 30 minutes and
the solid was filtered off. The solid was rinsed twice in water,
twice in isopropanol, and dried in a vacuum oven to yield 0.45
g.
##STR00021##
Poly(methacryloyl chloride)--Methacryloyl chloride (20 mL), divinyl
benzene (4 mL of 80% purity), AIBN (0.4 g), and THF (150 mL) were
stirred at 60.degree. C. under a nitrogen atmosphere for 18 hours.
The solution was cooled and the solid was filtered off, rinsed in
THF, then acetone, and dried in a vacuum oven to yield 8.1 g.
##STR00022##
Poly(guanidinobutylmethacrylamide)--Poly(methacryloyl chloride)
(0.5 g), agmatine sulfate (1.0 g), triethylamine (2.5 mL), and
acetone (50 mL) were stirred together for 4 days. Water (100 mL)
was added and the mixture stirred for 6 hours. The solid was
filtered off and washed by resuspending in water (500 mL), stirring
for 30 minutes, and filtering off the solid. The wash was repeated
twice in water, once in methanol, and the solid was dried in a
vacuum oven to yield 0.41 g.
##STR00023##
Poly(guanidinoacrylamide)--The procedure for
poly-(guanidinobutylacrylamide) was followed substituting
aminoguanidine bicarbonate (5.0 g) for the agmatine, yielding 0.75
g. Poly(PEH/EPI)--Epichlorohydrin (1.5 g) was added dropwise to a
solution containing pentaethylenehexamine (20 g) and water (100
mL), keeping the temperature between 65.degree. C. The solution was
stirred until it gelled and heating was continued for 4 hours (at
65.degree. C.). After sitting overnight at room temperature the gel
was removed and blended with water (1 L). The solid was filtered
off, water was added (1 L), and the blending and filtration were
repeated. The gel was suspended in isopropanol and the resulting
solid was collected by filtration and dried in a vacuum oven to
yield 28.2 g.
##STR00024##
Ethylidenebisacetamide--Acetamide (118 g), acetaldehyde (44.06 g),
copper acetate (0.2 g), and water (300 mL) were placed in a 1 L
three neck flask fitted with condenser, thermometer, and mechanical
stirred. Concentrated HCl (34 mL) was added and the mixture was
heated to 45-50.degree. C. with stirring for 24 hours. The water
was then removed in vacuo to leave a thick sludge which formed
crystals on cooling to 5.degree. C. Acetone (200 mL) was added and
stirred for a few minutes after which the solid was filtered off
and discarded. The acetone was cooled to 0.degree. C. and solid was
filtered off. This solid was rinsed in 500 mL acetone and air dried
18 hours to yield 31.5 g.
##STR00025##
Vinylacetamide--Ethylidenebisacetamide (31.05), calcium carbonate
(2 g) and celite 541 (2 g) were placed in a 500 mL three neck flask
fitted with a thermometer, a mechanical stirrer, and a distilling
head atop a vigroux column. The mixture was vacuum distilled at 35
mm Hg by heating the pot to 180-225.degree. C. Only a single
fraction was collected (10.8 g) which contained a large portion of
acetamide in addition to the product (determined by NMR). This
solid product was dissolved in isopropanol (30 mL) to form the
crude solution used for polymerization.
##STR00026##
Poly(vinylacetamide)--Crude vinylacetamide solution (15 mL),
divinylbenzene (1 g, technical grade, 55% pure, mixed isomers), and
AIBN (0.3 g) were mixed and heated to reflux under a nitrogen
atmosphere for 90 minutes, forming a solid precipitate. The
solution was cooled, isopropanol (50 mL) was added, and the solid
was collected by centrifugation. The solid was rinsed twice in
isopropanol, once in water, and dried in a vacuum oven to yield 0.8
g.
##STR00027##
Poly(vinylamine)--Poly(vinylacetamide) (0.79 g) was placed in a 100
mL one neck flask containing water 25 mL and concentrated HCl 25
mL. The mixture was refluxed for 5 days, the solid was filtered
off, rinsed once in water, twice in isopropanol, and dried in a
vacuum oven to yield 0.77 g. The product of this reaction
(.about.0.84 g) was suspended in NaOH (46 g) and water (46 g) and
heated to boiling (.about.140.degree. C.). Due to foaming the
temperature was reduced and maintained at .about.100.degree. C. for
2 hours. Water (100 mL) was added and the solid collected by
filtration. After rinsing once in water the solid was suspended in
water (500 mL) and adjusted to pH 5 with acetic acid. The solid was
again filtered off, rinsed with water, then the isopropanol, and
dried in a vacuum oven to yield 0.51 g.
Poly(trimethylammoniomethylstyrene chloride) is the copolymer of
trimethylammoniomethylstyrene chloride and divinyl benzene.
Poly(DET/EPI) is the polymer formed by reaction of
diethylenetriamine and epichlorohydrin.
[0044] Poly(ethyleneimine) Salts--Polyethyleneimine (25 g dissolved
in 25 g water) was dissolved in water (100 mL) and mixed with
toluene (1 L). Epichlorohydrin (2.3 mL) was added and the mixture
heated to 60.degree. C. with vigorous mechanical stirring for 18
hours. The mixture was cooled and the solid filtered off,
resuspended in methanol (2 L), stirred 1 hour, and collected by
centrifugation. The solid was suspended in water (2 L), stirred 1
hour, filtered off, suspended in water (4 L), stirred 1 hour, and
again filtered off. The solid was suspended in acetone (4 L) and
stirred 15 minutes, the liquid was poured off, acetone (2 L) was
added, the mixture was stirred 15 minutes, the acetone was again
poured off, and the solid was dried in a vacuum oven to form
intermediate "D".
Poly(ethyleneimine sulfate A)--Intermediate "D" (1.0 g) was
suspended in water (150 mL), stirred 30 minutes, and partially
neutralized with sulfuric acid (1.1 g). The mixture was stirred an
additional 30 minutes, the solid was filtered off, resuspended in
methanol (200 mL), stirred 5 minutes, filtered off, and dried in a
vacuum oven. Poly(ethyleneimine sulfate B)--Intermediate "D" (1.0
g) was suspended in water (150 mL), stirred 30 minutes, and
partially neutralized with sulfuric acid (0.57 g). The mixture was
stirred an additional 30 minutes, the solid was filtered off,
resuspended in methanol (200 mL), stirred 5 minutes, filtered off,
and dried in a vacuum oven. Poly(ethyleneimine sulfate
C)--Intermediate "D" (1.0 g) was suspended in water (150 mL),
stirred 30 minutes, and partially neutralized with sulfuric acid
(0.28 g). The mixture was stirred an additional 30 minutes, the
solid was filtered off, resuspended in methanol (200 mL), stirred 5
minutes, filtered off, and dried in a vacuum oven.
Poly(ethyleneimine sulfate D)--Intermediate "D" (1.0 g) was
suspended in water (150 mL), stirred 30 minutes, and partially
neutralized with sulfuric acid (0.11 g). The mixture was stirred an
additional 30 minutes, the solid was filtered off, resuspended in
methanol (200 mL), stirred 5 minutes, filtered off, and dried in a
vacuum oven. Poly(ethyleneimine tartrate A)--Intermediate "D" (1.0
g) was suspended in water (150 mL), stirred 30 minutes, and
partially neutralized with tartaric acid (1.72 g). The mixture was
stirred an additional 30 minutes, the solid was filtered off,
resuspended in methanol (200 mL), stirred 5 minutes, filtered off,
and dried in a vacuum oven. Poly(ethyleneimine tartrate
B)--Intermediate "D" (1.0 g) was suspended in water (150 mL),
stirred 30 minutes, and partially neutralized with tartaric acid
(0.86 g). The mixture was stirred an additional 30 minutes, the
solid was filtered off, resuspended in methanol (200 mL), stirred 5
minutes, filtered off, and dried in a vacuum oven.
Poly(ethyleneimine tartrate C)--Intermediate "D" (1.0 g) was
suspended in water (150 mL), stirred 30 minutes, and partially
neutralized with tartaric acid (0.43 g). The mixture was stirred an
additional 30 minutes, the solid was filtered off, resuspended in
methanol (200 mL), stirred 5 minutes, filtered off, and dried in a
vacuum oven. Poly(ethyleneimine ascorbate A)--Intermediate "D" (1.0
g) was suspended in water (150 mL), stirred 30 minutes, and
partially neutralized with ascorbic acid (4.05 g). The mixture was
stirred an additional 30 minutes, the solid was filtered off,
resuspended in methanol (200 mL), stirred 5 minutes, filtered off,
and dried in a vacuum oven. Poly(ethyleneimine ascorbate
B)--Intermediate "D" (1.0 g) was suspended in water (150 mL),
stirred 30 minutes, and partially neutralized with ascorbic acid
(2.02 g). The mixture was stirred an additional 30 minutes, the
solid was filtered off, resuspended in methanol (200 mL), stirred 5
minutes, filtered off, and dried in a vacuum oven.
Poly(ethyleneimine ascorbate C)--Intermediate "D" (1.0 g) was
suspended in water (150 mL), stirred 30 minutes, and partially
neutralized with ascorbic acid (1.01 g). The mixture was stirred an
additional 30 minutes, the solid was filtered off, resuspended in
methanol (200 mL), stirred 5 minutes, filtered off, and dried in a
vacuum oven. Poly(ethyleneimine citrate A)--Intermediate "D" (1.0
g) was suspended in water (150 mL), stirred 30 minutes, and
partially neutralized with citric acid (1.47 g). The mixture was
stirred an additional 30 minutes, the solid was filtered off,
resuspended in methanol (200 mL), stirred 5 minutes, filtered off,
and dried in a vacuum oven. Poly(ethyleneimine citrate
B)--Intermediate "D" (1.0 g) was suspended in water (150 mL),
stirred 30 minutes, and partially neutralized with citric acid
(0.74 g). The mixture was stirred an additional 30 minutes, the
solid was filtered off, resuspended in methanol (200 mL), stirred 5
minutes, filtered off, and dried in a vacuum oven.
Poly(ethyleneimine citrate C)--Intermediate "D" (1.0 g) was
suspended in water (150 mL), stirred 30 minutes, and partially
neutralized with citric acid (0.37 g). The mixture was stirred an
additional 30 minutes, the solid was filtered off, resuspended in
methanol (200 mL), stirred 5 minutes, filtered off, and dried in a
vacuum oven. Poly(ethyleneimine succinate A)--Intermediate "D" (1.0
g) was suspended in water (150 mL), stirred 30 minutes, and
partially neutralized with succinic acid (1.36 g). The mixture was
stirred an additional 30 minutes, the solid was filtered off,
resuspended in methanol (200 mL), stirred 5 minutes, filtered off,
and dried in a vacuum oven. Poly(ethyleneimine succinate
B)--Intermediate "D" (1.0 g) was suspended in water (150 mL),
stirred 30 minutes, and partially neutralized with succinic acid
(0.68 g). The mixture was stirred an additional 30 minutes, the
solid was filtered off, resuspended in methanol (200 mL), stirred 5
minutes, filtered off, and dried in a vacuum oven.
Poly(ethyleneimine chloride)--Polyethyleneimine (100 g in 100 g
water) was dissolved in water (640 mL additional) and the pH was
adjusted to 10 with concentrated HCl. Isopropanol (1.6 L) was
added, followed by epichlorohydrin (19.2 mL). The mixture was
stirred under nitrogen for 18 hours at 60.degree. C. The solids
were filtered off and rinsed with methanol (300 mL) on the funnel.
The solid was rinsed by resuspending it in methanol (4 L), stirring
30 minutes, and filtering off the solid. The rinse was repeated
twice with methanol, followed by resuspension in water (1 gallon).
The pH was adjusted to 1.0 with concentrated HCl, the solid was
filtered off, resuspended in water (1 gallon), the pH again
adjusted to 1.0 with concentrated HCl, the mixture stirred 30
minutes, and the solid filtered off. The methanol rinse was again
repeated and the solid dried in a vacuum oven to yield 112.4 g.
Poly(dimethylethyleneimine chloride)--Poly(ethyleneimine chloride)
(5.0 g) was suspended in methanol (300 mL) and sodium carbonate (50
g) was added. Methyl iodide (20 mL) was added and the mixture
heated to reflux for 3 days. Water was added to reach a total
volume of 500 mL, the mixture stirred for 15 minutes, and the solid
filtered off. The solid was suspended in water (500 mL), stirred 30
minutes, and filtered. The solid was suspended in water (1 L), the
pH adjusted to 7.0 with concentrated HCl, and the mixture stirred
for 10 minutes. The solid was filtered off, resuspended in
isopropanol (1 L), stirred 30 minutes, filtered off, and dried in a
vacuum oven to yield 6.33 g.
Use
[0045] The methods of the invention involve treatment of patients
with hyperphosphatemia. Elevated serum phosphate is commonly
present in patients with renal insufficiency, hypoparathyroidism,
pseudohypoparathyroidism, acute untreated acromegaly,
overmedication with phosphate salts, and acute tissue destruction
as occurs during rhabdomyolysis and treatment of malignancies.
[0046] The term "patient" used herein is taken to mean any
mammalian patient to which phosphate binders may be administered.
Patients specifically intended for treatment with the methods of
the invention include humans, as well as nonhuman primates, sheep,
horses, cattle, goats, pigs, dogs, cats, rabbits, guinea pigs,
hamsters, gerbils, rats and mice.
[0047] The compositions utilized in the methods of the inventions
are orally administered in therapeutically effective amounts.
Further, the polymer are preferably non-toxic and stable upon
administration. A therapeutically effective amount of compound is
that amount which produces a result or exerts an influence on the
particular condition being treated. As used herein, a
therapeutically effective amount of a phosphate binder means an
amount which is effective in decreasing the serum phosphate levels
of the patient to which it is administered.
[0048] By "non-toxic" it is meant that when ingested in
therapeutically effective amounts neither the polymers nor any ions
released into the body upon ion exchange are harmful or are
substantially harmful.
[0049] By "stable" it is meant that when ingested in
therapeutically effective amounts the polymers do not dissolve or
otherwise decompose to form potentially harmful by-products, and
remain substantially intact so that they can transport bound
phosphate out of the body.
[0050] The present pharmaceutical compositions are generally
prepared by known procedures using well known and readily available
ingredients. In making the compositions of the present invention,
the polymeric phosphate binder may be present alone, may be admixed
with a carrier, diluted by a carrier, or enclosed within a carrier
which may be in the form of a capsule, sachet, paper or other
container. When the carrier serves as a diluent, it may be a solid,
semi-solid or liquid material which acts as a vehicle, excipient or
medium for the polymer. Thus, the compositions can be in the form
of tablets, pills, powders, lozenges, sachets, cachets, elixirs,
suspensions, syrups, aerosols, (as a solid or in a liquid medium),
soft or hard gelatin capsules, sterile packaged powders, and the
like. Examples of suitable carrier, excipients, and diluents
include foods, drinks, lactose, dextrose, sucrose, sorbitol,
mannitol, starches, gum acacia, alginates, tragacanth, gelatin,
calcium silicate, microcrystalline cellulose, polyvinylpyrrolidone,
cellulose, methyl cellulose, methylhydroxybenzoates,
propylhydroxybenzoates, propylhydroxybenzoates, and talc.
[0051] It should be understood, however, that the foregoing
description of the invention is intended merely to be illustrative
by way of example only and than other modifications, embodiments,
and equivalents may be apparent to those skilled in the art without
departing from its spirit.
* * * * *