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    • 4. 发明授权
    • Multiarmed, monofunctional, polymer for coupling to molecules and
surfaces
    • 用于偶联到分子和表面的多臂单功能聚合物
    • US5932462A
    • 1999-08-03
    • US443383
    • 1995-05-17
    • J. Milton HarrisFrancesco Maria VeronesePaolo CalicetiOddone Schiavon
    • J. Milton HarrisFrancesco Maria VeronesePaolo CalicetiOddone Schiavon
    • A61K47/48C08G65/329C12N9/96A01N63/00C07K17/00C12N11/06
    • C08G65/48A61K47/48215C08G65/329C12N9/96Y10S530/815Y10S530/816
    • Multi-armed, monofunctional, and hydrolytically stable polymers are described having the structure ##STR1## wherein Z is a moiety that can be activated for attachment to biologically active molecules such as proteins and wherein P and Q represent linkage fragments that join polymer arms poly.sub.a and poly.sub.b, respectively, to central carbon atom, C, by hydrolytically stable linkages in the absence of aromatic rings and ester groups in the linkage fragments. R typically is hydrogen or methyl, but can be a linkage fragment that includes another polymer arm. A specific example is an mPEG disubstituted lysine having the structure ##STR2## where mPEG.sub.a and mPEG.sub.b have the structure CH.sub.3 O--(CH.sub.2 CH.sub.2 O).sub.n CH.sub.2 CH.sub.2 -- wherein n may be the same or different for mPEG.sub.a and mPEG.sub.b and can be from 1 to about 1,150 to provide molecular weights of from about 100 to 100,000. The mPEG disubstituted lysine can be purified from a reaction mixture by chromatography in water, including gel filtration chromatography and ion exchange chromatography because the carboxyl group is ionizable. Impurities are removed, including unreacted mPEG and mPEG monosubstituted lysine, to provide the polymer in pure form. Ion exchange chromatography permits fractionation of a greater amount of polymer per run.
    • 描述了具有以下结构的多臂,单功能和水解稳定的聚合物,其中Z是可被激活以附着于生物活性分子如蛋白质的部分,并且其中P和Q分别表示分别连接聚合物臂polya和polyb的连接片段 ,通过在不存在芳环和通过连接片段中的酯基的水解稳定键连接到中心碳原子。 R通常是氢或甲基,但可以是包含另一聚合物臂的连接片段。 具体实例是具有mPEGa和mPEGb具有CH 3 O-(CH 2 CH 2 O)n CH 2 CH 2结构的结构的mPEG二取代的赖氨酸,其中n可以相同或不同于mPEGa和mPEGb,并且可以为1至约1,150,以提供 从约100到100,000。 可以通过色谱法在水中从反应混合物中纯化mPEG二取代的赖氨酸,包括凝胶过滤色谱和离子交换色谱法,因为羧基是可离子化的。 除去杂质,包括未反应的mPEG和mPEG单取代的赖氨酸,以提供纯的形式的聚合物。 离子交换色谱法允许每次运行更大量的聚合物分级。