title: [Production of polyhydroxyalkanoates by a mixed culture].
abstract: The feasibility of using a mixed culture of A. chroococcum G-3 and B. megaterium G-6 in the production of polyhydroxyalkanoates has been studied. The optimal conditions for the mixed culture were established. After the G-3 strain was incubated alone for 24 - 28 hours, the broth was inoculated with 15% (v/v) of the G-6 culture. 0.5% peptone and 0.5% NH4NO3 were added to the mixture. The mixed culture was proceed to 42 - 46 h. Final dry cell weight was up to 32 g/L and the content of PHA was up to 80%. Combined with the nutrient supplement, the dry cell weight increased to 53 g/L and the content of PHA increased to 42g/L. The conversion of sucrose to PHA is 0.32. The mixed culture solved the problems caused by the increase in viscosity, poor mass transfer, low supplemental sucrose amounts.
authors.affiliation: Life Science College of Northwest University, Biotechnology Key Laboratory of Shanxi Province, Xi' an 710069, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xuenan
authors.initials: X
authors.lastname: Sun
authors.forename: Bang
authors.initials: B
authors.lastname: Chen
authors.forename: Zhaolin
authors.initials: Z
authors.lastname: Dong
mesh_terms: D001395:Azotobacter / Q000378:metabolism*; D001410:Bacillus megaterium / Q000378:metabolism*; D018533:Biomass; D003470:Culture Media / Q000378:metabolism; D046508:Culture Techniques / Q000379:methods*; D005285:Fermentation; D007218:Industrial Microbiology; D054813:Polyhydroxyalkanoates / Q000378:metabolism*
chemical_list: D003470:Culture Media; D054813:Polyhydroxyalkanoates