PROCESS FOR OBTAINING POLYHYDROXYALKANOATES WITHOUT A DYESTUFF

• Main Authors: RAPTHEL INNO, LEHMANN OLAF, RAUCHSTEIN KLAUS-DIETER, MAYER TORSTEN, SCHAFFER JURGEN, RUNKEL DIETMAR
• Format: Patent
• Language: English
• Published: 15.03.1995
• Edition: 5
• Subjects: BEER; BIOCHEMISTRY; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS THEREOF; CULTURE MEDIA; ENZYMOLOGY; FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIREDCHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERSFROM A RACEMIC MIXTURE; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MICROBIOLOGY; MICROORGANISMS OR ENZYMES; MUTATION OR GENETIC ENGINEERING; ORGANIC MACROMOLECULAR COMPOUNDS; PROPAGATING, PRESERVING OR MAINTAINING MICROORGANISMS; SPIRITS; THEIR PREPARATION OR CHEMICAL WORKING-UP; VINEGAR; WINE

A process is disclosed for preparing dye-free polyhydroxyalkanoates formed in the cells as storage substances during the culture of bacterial biomasses. The dried bacterial biomass is at first exposed for 10 to 120 minutes to a temperature between 80 DEG C and the lower limit of the polyhydroxyalkanoate melting range, and is then extracted with acetic acid; 1 to 10 parts per volume, expressed as a percentage, of an aliphatic carboxylic acid derivate, are added to the extracting agent.