Zoogloea ramigera l15SLR의 다당류 생산에 영향을 미치는 인자

Factors Affecting on the Production of Exopolysaccharides from Zoogloea ramigera l15SLR.

  • 소한섭 (계명대학교 식품가공학과) ;
  • 김찬식 (제주대학교 원예생명과학부) ;
  • 이삼빈 (계명대학교 식품가공학과)
  • 발행 : 2002.09.01

초록

Zoogloea ramigera l15SLR로부터 zooglan다당류의 생산을 위한 최적조건에 관한 연구를 수행하였다 탄소원으로 2.5%의 glucose와 lactose를 이용하였을 때 각각 10.7, 10.5 g/L의 다당류를 생산하였으며 , galactose, white sugar, brown sugar의 경우는 각각 6.4, 6.7, 8.7 g/L의 다당류 생산 을 보였다. 2.5% glucose가 첨가된 제한배지에서 종균 배양액(TSB 배지)을 7ml 이상 접종함으로서 종균 1 ml를 접종 하석 생산된 다당류(2.37 gt) 보다 약 4배의 높은 다당류 생산(10.28 g/L)을 보였다. 종균 배양액을 5 ml이상 접종시에 배양 36시간 이후부터 다당류를 생산하였으며 48시간 배양시에 10g/L이상의 다당류 생산이 가능하였다. 탄소원으로서 또한, 종균 배양액의 흡광도가 1.0~l.7일 경우에 10g/L 이상의 다당류를 생산하였으며, 이 범위를 벗어나는 경우에는 다당류 생산이 저해되었다. 배양액에 rifampicin첨가는 12 g/L이상의 다당류 생산을 보였으며, 다당류 분자량은 1.367$\times$106(g/mol)로서 rifampicin을 가하지 경우 1.711$\times$106(g/mol)와 약간의 차이를 보였다.

The production of exopolysaccharide from Zoogloea ramigera 115SLR in batch culture was affected by carbon sources, rifampicin concentration, inoculum size and cell density of starter culture. The increase of organic nitrogen concentration and cell density in defined medium by adding starter culture resulted in higher production of exopolysaccharide (EPS) within 2 days. Glucose and lactose as carbon sources showed EPS production of 10.7 gk and 10.5 ga, respectively. Higher EPS production was obtained with 2.5% (w/v) glucose. White sugar, brown sugar and galactose produced less than 10 gt of EPS. The optical density of starter culture affected on EPS yield, producing over 10 gt of EPS in the range of 1.0-1.7. In the presence of rifsmpicin, Z. ramigera 115SLR produced EPS of 12.9 gt. Molecular weight of EPS produced with/without rifampicin was determined with 1.367$\times$106 and 1.711$\times$106 g/mol using HPSEC-MALLS-RI, respectively.

키워드

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