Polysaccharide-polyamine copolymer and use thereof in reducing uric acid concentration in plasma
First Claim
1. A pharmaceutical composition for treatments of hyperuricemia, the pharmaceutical composition comprises an amino-polysaccharide copolymer and a pharmaceutically acceptable salt thereof as an active ingredient, the amino-polysaccharide copolymer is a copolymerization product of the following two parts:
- a selectively oxidized polysaccharide having a 2,3-dialdehyde moiety, and an amino polymer which provides an amino functionality;
the amino polymer cross linking the selectively oxidized polysaccharide having a 2,3-dialdehyde moiety to form a net-like structure and finally to provide a hydrogel having an amino functionality or a particulate amino-polysaccharide copolymer, amino functionalities of the hydrogel having an amino functionality or the particulate amino-polysaccharide copolymer can be protonated to form a cationic copolymer having three dimensional network structure and protonation sites, a nitrogen content of the cationic copolymer or the amino-polysaccharide copolymer is at least 12.3% weight percent, or at least 15% weight percent, or at least 22% weight percent, or at least 40% weight percent, the cationic copolymer and the amino-polysaccharide copolymer are both insoluble in water,wherein in the selectively oxidized polysaccharide having a 2,3-dialdehyde moiety, a ratio of an amount of oxidized glucose units to the total amount of glucose units is at least 50%, at least 70%, or at least 80%.
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Abstract
Disclosed is a pharmaceutical composition for treating hyperuricemia (HUA). The pharmaceutical composition includes a polysaccharide-polyamine copolymer and a pharmaceutically acceptable salt thereof as active ingredients. The polysaccharide-polyamine copolymer is formed by copolymerization of the following two parts: a selectively oxidized polysaccharide with 2,3-dialdehydo, and a polyamine with an amino functional group; the polyamine with an amino functional group and the selectively oxidized polysaccharide with 2,3-dialdehydo can form a net structure by means of covalent crosslinking, resulting in a hydrogel with an amino functional group or a granular polysaccharide-polyamine copolymer, wherein the amino functional group in the hydrogel with an amino functional group or the granular polysaccharide-polyamine copolymer can be protonated so as to form a cationic copolymer of a three-dimensional network structure having a protonated site, and the nitrogen content of the cationic copolymer and the nitrogen content of the polysaccharide-polyamine copolymer are above 12.3 wt %, and both the cationic copolymer and the polysaccharide-polyamine copolymer are water-insoluble.
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Citations
20 Claims
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1. A pharmaceutical composition for treatments of hyperuricemia, the pharmaceutical composition comprises an amino-polysaccharide copolymer and a pharmaceutically acceptable salt thereof as an active ingredient, the amino-polysaccharide copolymer is a copolymerization product of the following two parts:
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a selectively oxidized polysaccharide having a 2,3-dialdehyde moiety, and an amino polymer which provides an amino functionality; the amino polymer cross linking the selectively oxidized polysaccharide having a 2,3-dialdehyde moiety to form a net-like structure and finally to provide a hydrogel having an amino functionality or a particulate amino-polysaccharide copolymer, amino functionalities of the hydrogel having an amino functionality or the particulate amino-polysaccharide copolymer can be protonated to form a cationic copolymer having three dimensional network structure and protonation sites, a nitrogen content of the cationic copolymer or the amino-polysaccharide copolymer is at least 12.3% weight percent, or at least 15% weight percent, or at least 22% weight percent, or at least 40% weight percent, the cationic copolymer and the amino-polysaccharide copolymer are both insoluble in water, wherein in the selectively oxidized polysaccharide having a 2,3-dialdehyde moiety, a ratio of an amount of oxidized glucose units to the total amount of glucose units is at least 50%, at least 70%, or at least 80%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for reducing serum uric acid comprising administering a pharmaceutical composition comprising an amino-polysaccharide copolymer and a pharmaceutically acceptable salt thereof as an active ingredient, wherein, the amino-polysaccharide copolymer is a copolymerization product of the following two parts:
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a selectively oxidized polysaccharide having a 2,3-dialdehyde moiety, and an amino polymer which provides an amino functionality; the amino polymer cross linking the selectively oxidized polysaccharide having a 2,3-dialdehyde moiety to form a net-like structure and finally to provide a hydrogel having an amino functionality or a particulate amino-polysaccharide copolymer, amino functionalities of the hydrogel having an amino functionality or the particulate amino-polysaccharide copolymer can be protonated to form a cationic copolymer having three dimensional network structure and protonation sites, a nitrogen content of the cationic copolymer or the amino-polysaccharide copolymer is at least 12.3% weight percent, or at least 15% weight percent, or at least 22% weight percent, or at least 40% weight percent, the cationic copolymer and the amino-polysaccharide copolymer are both insoluble in water; wherein in the selectively oxidized polysaccharide having a 2,3-dialdehyde moiety, a ratio of an amount of oxidized glucose units to the total amount of glucose units is at least 50%, at least 70%, or at least 80%. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification