US Patent 7435566 Method of purifying 3-hyroxyalkanoic acid copolymer

Patent 7435566 was granted and assigned to Kaneka Corporation on October, 2008 by the United States Patent and Trademark Office.

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Patent Inventor Names

Fumio Osakada0

Keiji Matsumoto0

Kenji Miyamoto0

Noriko Ogawa0

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Patent 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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