Method for isolation and purification of S-(1,2-dicarboxyethyl)

Details Method for isolation and purification of S-(1,2-dicarboxyethyl) Method for isolation and purification of S-(1,2-dicarboxyethyl)

1997-09-03

1998-06-30

Shippen, Michael L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562557, 530332, 530344, C07C22700

Patent

active

057736529

ABSTRACT:
An improved method for isolating and purifying a glutathione derivative is disclosed. More particularly, the invention provides a method for isolating and purifying S-(1, 2-dicarboxyethyl)glutathione or its pharmacologically acceptable salt from a reaction mixture available upon reacting glutathione or its salt with either fumaric acid or its salt or maleic acid or its salt, which comprises a first step of converting the S-(1, 2-dicarboxyethyl)glutathione or salt thereof in the reaction mixture to the corresponding copper salt, dissolving the copper salt in an aqueous solution of acetic acid, formic acid or propionic acid, and removing the contaminant glutathione, oxidized glutathione and fumaric acid copper salts with the aid of activated carbon and a second step of dissolving or suspending the isolated S-(1,2-dicarboxyethyl)glutathione copper salt in water and blowing hydrogen sulfide gas through the resulting aqueous solution or suspension to remove copper.

REFERENCES:
patent: 4582801 (1986-04-01), Hamada
patent: 5081149 (1992-01-01), Ohmori
patent: 5135952 (1992-08-01), Ohmori
patent: 5212159 (1993-05-01), Ohmori
patent: 5541162 (1996-07-01), Ohmori

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