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http://dx.doi.org/10.5352/JLS.2008.18.12.1625

Production of Poly-3-hydroxybutyrate from Xylose by Bacillus megaterium J-65  

Jun, Hong-Ki (Department of Microbiology, College of Natural Science, Pusan National University)
Jin, Young-Hi (Department of Microbiology, College of Natural Science, Pusan National University)
Kim, Hae-Nam (Department of Beauty Care, Masan College)
Kim, Yun-Tae (Seoul Medical Science Institute and Seoul Clinical Laboratories)
Kim, Sam-Woong (Department of Microbiology, College of Natural Science, Pusan National University)
Baik, Hyung-Suk (Department of Microbiology, College of Natural Science, Pusan National University)
Publication Information
Journal of Life Science / v.18, no.12, 2008 , pp. 1625-1630 More about this Journal
Abstract
A microorganism capable of producing high level of poly-3-hydoxybutyrate (PHB) from xylose was isolated from soil. The isolated strain J-65 was identified as Bacillus megaterium based on the morphological, biochemical and molecular biological characteristics. The optimum temperature and pH for the growth of B. megaterium J-65 were $37^{\circ}C$ and 8.0, respectively. The optimum medium composition for the cell growth was 2% xylose, 0.25% $(NH_4)_2SO_4$, 0.3% $Na_2HPO_4{\cdot}12H_2O$, and 0.1% $KH_2PO_4$. The optimum condition for PHB accumulation was same to the optimum condition for cell growth. Copolymer of ${\beta}$-hydroxybutyric and ${\beta}$-hydroxyvaleric acid was produced when propionic acid was added to shake flasks containing 20 g/l of xylose. Fermenter culture was carried out to produce the high concentration of PHB. In batch culture, cell mass was 9.82 g/l and PHB content was 35% of dry cell weight. PHB produced by B. megaterium J-65 was identified as homopolymer of 3-hydoxybutyric acid by GC and NMR.
Keywords
Poly-3-hydoxybutyrate; xylose; Bacillus megaterium J-65;
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