Method of purifying 3-hydroxyalkanoic acid copolymer

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

C - Chemistry, Metallurgy

12

P

C12P 7/62 (2006.01) C08G 63/90 (2006.01) C08G 63/06 (2006.01)

Patent

CA 2499608

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.

L'invention concerne un procédé permettant de purifier PHA, séparé de cellules microbiennes contenant PHA, à une pureté élevée sans diminuer considérablement son poids moléculaire. L'invention concerne essentiellement une méthode permettant de purifier un copolymère d'acide 3-hydroxyalcanoïque produit au moyen d'un micro-organisme. On effectue un traitement à l'aide de peroxyde d'hydrogène tout en ajoutant, de manière continue ou intermittente, un alcali à une suspension aqueuse contenant le copolymère d'acide 3-hydroxyalcanoïque séparé du micro-organisme afin de réguler la valeur du pH de la suspension aqueuse.

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