乳酸链球菌素
乳酸乳球菌
细菌纤维素
乳酸
发酵
食品科学
化学
结晶度
肠杆菌
纤维素
乳球菌
单作
细菌
微生物学
生物化学
生物
有机化学
抗菌剂
大肠杆菌
农学
遗传学
基因
结晶学
作者
Wanjin Qiao,Yu Qiao,Zitong Liao,Ge Gao,Zhenzhou Wu,Per E. J. Saris,Haijin Xu,Mingqiang Qiao
标识
DOI:10.1016/j.ijbiomac.2022.01.038
摘要
In this study, a co-culturing Enterobacter sp. and Lactococcus lactis strategy was developed to alter bacterial cellulose (BC) properties and increase nisin yields. We generated high nisin yields (6260 IU/mL) by altering inoculum ratios and inoculation times in a novel co-culture system. Critically, these were 85% higher than L. lactis monocultures. By monitoring fermentation broth pH and lactic acid yields, the pH was higher and lactic acid yields lower during co-culture conditions when compared with L. lactis monocultures, suggesting that co-culturing was more suitable for L. lactis nisin production. We also determined BC film yields and properties (BC, BC-N, and BC-N after nisin release). BC yields produced by co-culturing were not very different from Enterobacter sp. monocultures, but crystallinity was significantly altered. Collectively, our co-culture system adequately and economically modified BC fibers by interfering with self-assembly and crystallization processes during BC synthesis, with significantly improved nisin yields.
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