Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Optimization of Culture Condition of Gluconacetobacter hansenii TF-2 for Cellulose Gel Production

Gluconacetobacter hansenii TF-2를 이용한 감귤과즙으로부터의 셀루로스 겔 생산의 최적화

  • 최경호 (대구가톨릭대학교 식품영양학과) ;
  • 정지숙 (대구가톨릭대학교 식품영양학과) ;
  • 문철호 (경북과학대학 전통식품연구소) ;
  • 김미림 (경북과학대학 전통식품연구소)
  • Published : 2004.01.01
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Abstract

Gluconacetobacter hansenii TF-2, an isolate from black tea fungus, was statically cultivated to ferment cellulose gel from citrus juice. The juice prepared by press filtering of peeled citrus fruit contained 135.5 mg of total sugar/mL, 1.23% of total acid, and average pH of the juice was 3.98. The bacterium produced cellulose gel optimally on the surface of culture broth containing 17% of citrus juice and 10$^{\circ}$Brix of total sugar. The optimum temperature was 3$0^{\circ}C$ for producing acetic acid and gel formation. The bacterium could not produce acetic acid on gel formation at 4$0^{\circ}C$. The optimum pH was 3.0∼4.0 but was not significantly different between pH 3.0∼4.0. The cultivation for 18 days under optimal conditions produced gel as 14.2$\pm$0.6 mm of thickness and acids equivalent to 1.90$\pm$0.22% of acetic acid. The pH of culture broth was stabilized at 2.6∼2.8 during the cultivation. Remaining sugar content was 27.1$\pm$4.2 mg/mL of total sugar and 6.9 mg/mL of reducing sugar. The gel productivity was 137.8$\pm$9.7 g/L.

셀루로스성 겔을 생산할 목적으로 tea fungus로부터 분리한 Gluconacetobacter hanseii TF-2와 제주산 감귤과즙을 이용하여 겔 생산을 위한 최적 배양조건을 검토하였다. 발효균은 가당한 홍차의 표면에 생성된 tea fungus로부터 분리하였으며, 과즙은 제주산 감귤을 박피하고 압착하여 착즙한 후 여과하였다. 과즙은 135.5 mg/mL의 총당과 1.23%의 산을 함유하였으며 평균 pH 3.98을 나타내었다. G. hansenii는 과즙 17% 희석액에 정백당을 첨가하여 초기당도를 $10^{\circ}$Brix로 조정한 것을 가장 잘 발효하였다. 최적 발효온도는 3$0^{\circ}C$였으며 4$0^{\circ}C$ 이상에서는 겔이 생성되지 아니하였다. 최적 pH는 3.0으로 판정되었으나, pH 3.0∼4.0 사이에 유의적인 차이는 없었다. 검토한 조건들을 조합하여 18일간 정치배양함으로서 두께 14.2$\pm$0.6 mm의 백색 겔이 형성되었다 이 과정에서 배양액에 1.90$\pm$0.22%의 산이 생성되었으며 pH는 2.75$\pm$0.09로 저하되었다. 발효 종료 후 배양액 중에는 총당 27.1$\pm$4.2 mg/mL, 환원당 6.9$\pm$1.2 mg/mL이 잔존하였다. 겔 수율은 137.8$\pm$9.7 g/L로 분석되었다.

Keywords

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