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Mannanase Production by a Soybean Isolate, Bacillus subtilis WL-7.  

권민아 (우송대학교 식품생명과학부, 생물소재 응용연구센터)
김현숙 (우송대학교 식품생명과학부)
이미성 (씨티씨바이오 중앙연구소)
최준호 (씨티씨바이오 중앙연구소)
윤기홍 (우송대학교 식품생명과학부, 생물소재 응용연구센터)
Publication Information
Microbiology and Biotechnology Letters / v.31, no.3, 2003 , pp. 277-283 More about this Journal
Abstract
A bacterium producing the extracellular mannanase was isolated from Korean soybean paste. The isolate WL-7 has been identified as Bacillus subtiis on the basis on its 16S rRNA sequence, fatty acid composition, morphology and biochemical properties. The mannanase of culture supernatant was the most active around $55^{\circ}C$ and pH $6.0^{\circ}C$, and retained 90% of its maximum activity at range of pH 5.0∼7.5 and $50∼60^{\circ}C$. The additional carbohydrates including lactose, $\alpha$-cellulose, avicel, locust bean gum (LBG), wheat bran and konjak increased dramatically the mannanase productivity of strain WL-7. Especially, the maximum mannanase productivity was reached to 224 U/ml in LB medium supplemented with both 0.5% LBG and 0.5% konjak, which was approximately 200-folds more than that in LB medium. It was suggested that the increase of mannanase production was owing to induction of mannanase biosynthesis by both LBG and konjak hydrolysates transported following initial hydrolysis by extracellular mannanase during the cell growth.
Keywords
Bacillus subtilis; identification; locust bean gum; konjak; mannanase production;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By SCOPUS : 8
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