Production of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) from Butyric Acid and Valeric Acid by Azotobacter sp.

Azotobacter sp.에 의한 Butyric Acid와 Valeric Acid로부터 Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)의 생산

  • Song, Hee-Ju (Department of Agricultural Chemistry, Korea Unversity) ;
  • Lee, Il-Seok (Department of Agricultural Chemistry, Korea Unversity) ;
  • Bang, Won-Gi (Department of Agricultural Chemistry, Korea Unversity)
  • 송희주 (고려대학교 자원자원대학 농화학과) ;
  • 이일석 (고려대학교 자원자원대학 농화학과) ;
  • 방원기 (고려대학교 자원자원대학 농화학과)
  • Published : 1996.02.01

Abstract

For the production of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(P(3HB-co-3HV)) from butyric acid and valeric acid, 10 strains of bacteria capable of producing P(3HB-co-3HV) were isolated from soil. Among them, the strain HJ-067 showed the best ability of producing P(3HB-co-3HV), and was indentified as a Azotobacter sp. For the production of P(3HB-co-3HV), the optimum concentrations of butyric and valeric acid were 3.0g/l, respectively. The most effective nitrogen source was $(NH_4)_{2}SO_4$ at an optimum concentration of 0.75g/l, which was equivalent to 21.36 in C/N ratio. Deficiency of the cationic metal ions ($Zn^{2+},\;Co^{2+},\;Mn^{2+}$) in the proguction medium had stimulating effect on P(3HB-co-3HV) accumulation, especially in the manganese. deficient medium. The optimum temperature for P(3HB-co-3HV) production was 27$^{\circ}C$ and the optimum initial pH was 7.0. Under the optimum conditions, 1.82g/l of P(3HB-co-3HV) and 3.00g/l of dry biomass were produced after 36 hour cultivation, and the P(3HB-co-3HV) yield and HV% were 60.60% (w/w), 15.92%, respectively.

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