METHOD OF PURIFYING 3-HYDROXYALKANOIC ACID COPOLYMER

摘要

It is intended to provide a method of purifying PHA, which is separated from PHA-containing microbial cells, at a high purity without causing a considerable decrease in its molecular weight. Namely, a method of purifying a 3-hydroxyalkanoic acid copolymer produced by a microorganism wherein a treatment with hydrogen peroxide is carried out while continuously or intermittently adding an alkali to an aqueous suspension containing the 3- hydroxyalkanoic acid copolymer separated from the microorganism to thereby control the pH value of the aqueous suspension.