Effect of Medium Composition on the Bacterial Cellulose Production by Gluconacetobacter hansenii PJK

배지조성이 Gluconacetobacter hansenii PJK의 Bacterial Cellulose 생산에 미치는 영향

  • 정재용 (경북대학교 화학공학과) ;
  • 박연희 (경북대학교 화학공학과) ;
  • 박중곤 (경북대학교 화학공학과)
  • Published : 2003.04.01

Abstract

The effect of medium composition on the production of bacterial cellulose (BC) by Gluconacetobacter hansenii PJK was investigated. The addition of yeast extract and peptone in the medium increased the production yield (Y/sub p/s/) of BC. The amount of BC produced by G. hansenii PJK was constant if the initial pH of the medium was in the range 4.5 to 6.0. Strains from the supernatant of the culture medium produced more BC than those from inside the BC. BC production was dependent on glucose metabolism, and the addition of fructose or lactate as a carbon source converted cells to Cel/sup -/ mutants. Cel/sup -/ mutants produced by the addition of fructose or lactate to the medium caused 73% or 30% decreases in BC production, respectively. The addition of succinate, which is one of the constituents of the TCA cycle, did not affect the production of BC.

Gluconacetobacter hansenii PJK의 경우 배지 조성 중 탄소원보다는 질소원 및 acetic acid가 BC 생산에 더 많은 영향을 미쳤다. 또한 BC 생산능은 pH 4.1-6.0 범위에서 배지의 초기 pH 영향을 거의 받지 않았으며 BC에 둘러싸인 균주보다 배양 상등액에 존재하는 균주의 BC 생산능이 더 우수하였다. G. hansenii PJK의 BC 생산은 fructose metabolism이 아닌 glucose metabolism으로 이루어지며 배지 성분 중 fructose와 lactate는 Cel$^{-}$ mutant의 발생 및 성장을 촉진시켰으며 TCA cycle에 위치하는 succinate의 첨가는 BC 생산에 거의 영향을 미치지 않았다.

Keywords

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