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Optimization for Lacticin SA72 Production by Lactococcus lactis SA72 Isolated from Jeot-gal.  

백현동 (경남대학교 생명과학부)
구경모 (경남대학교 생명과학부)
김진곤 (경남대학교 생명과학부)
이나경 (경남대학교 생명과학부)
Publication Information
Microbiology and Biotechnology Letters / v.31, no.1, 2003 , pp. 46-50 More about this Journal
Abstract
Lactococcus lactis SA72 from Jeot-gal (Korean traditional fermented fish foods) produces lacticin SA72. The influence of several parameters on the fermentative production of lacticin SA72 by Lactococcus lactis SA72 was studied. MRS medium among several media was selected for enhanced bacteriocin production. The mean growth rate and bacteriocin productivity of L. lactis SA72 increased as the initial pH of the media increases. The highest lacticin SA72 activity was detected 3,200 AU/ml at pH 6.0, $32^{\circ}C$, and 1% (inoculum size, v/v) in the jar fermenter. Enhanced production of lacticin SA72 was investigated by a fed-batch cultivation with the intermittent feeding of the concentrated glucose solution. Under the optimized conditions, lacticin SA72 activity finally reached to 6,400 AU/ml.
Keywords
Lactococcus lactis SA72; bacteriocin; lacticin SA72; fed-batch culture; optimization;
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