Method of purifying 3-hyroxyalkanoic acid copolymer

Details Method of purifying 3-hyroxyalkanoic acid copolymer Method of purifying 3-hyroxyalkanoic acid copolymer

2003-09-30

2008-10-14

Lilling, Herbert J. (Department: 1657)

Chemistry: molecular biology and microbiology

Micro-organism, tissue cell culture or enzyme using process...

Preparing oxygen-containing organic compound

Reexamination Certificate

active

07435566

ABSTRACT:
The object of this invention is to provide a method for purifying PHA separated from PHA-containing microbial cells in high purity without incurring any serious decrease in molecular weight. The present invention provides a method for purifying a 3-hydroxyalkanoic acid copolymer produced by a microorganism, which comprises treating an aqueous suspension containing the 3-hydroxyalkanoic acid copolymer separated from a microorganism with a hydrogen peroxide while controlling the pH of said aqueous suspension by adding an alkali either continuously or intermittently.

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