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US 5,324,844 AGranted
Active carbonates of polyalkylene oxides for modification of polypeptides
AssigneeEnzon, Inc.
InventorShmuel Zalipsky
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Abstract
Poly(ethylene glycol)-N-succinimide carbonate and its preparation are disclosed. Polyethylene glycol (PEG) is converted into its N-succinimide carbonate derivative. This form of the polymer reacts readily with amino groups of proteins in aqueous buffers. The modified proteins have PEG-chains grafted onto the polypeptide backbone by means of stable, hydrolysis-resistant urethane (carbamate) linkages.
Claims7
A polyalkylene oxide having a molecular weight of less than about 20,000, where at least one end group of said polyalkylene oxide is an oxycarbonyl-oxy-N-dicarboximide group.
Dependencies are inferred from the claim text.