不同氮源对威兰胶分批发酵及其流变学性质的影响  

Influences of different nitrogen sources on welan batch fermentation and its rheological properties

作　　者：姬彬[1] 詹晓北[1] 吴剑荣[1] 蒋芸[1] 徐敏[1] 

机构地区：[1]江南大学生物工程学院,糖化学与生物技术教育部重点实验室,无锡214122

出　　处：《工业微生物》2013年第1期46-51,共6页Industrial Microbiology

基　　金：国家"863"计划项目("食品添加剂制造关键技术研究";2011BAD23B04)资助

摘　　要：研究了玉米浆干粉和复合氮源(NaN03和大豆蛋白胨)对Sphingomonans sp.ZW-3产威兰胶及其流变学性质的影响。结果表明:以玉米浆干粉为氮源时威兰胶产量达到17.6 g/L,威兰胶产品(0.5%溶液)表现出较强的液性行为和角频率依赖性,其平均分子量较低且分布宽。复合氮源有利于菌体生长,但威兰胶产量仅15.1 g/L,所得威兰胶产品(0.5%溶液)表现出较强的固性行为和角频率不依赖性,其平均分子量较高且分布窄。Effects of nitrogen Sphingomonas sp. ZW-3 was inv sources （dried corn syrup, NaNO3 and soybean peptone ） on welan production by estigated and the rheological properties of produced welan were evaluated. When dried corn syrup was used as nitrogen source, the welan yield reached 17.6 g/L, as compared to welan yield of 15.1 g/L with combined nitrogen （the mixture of NaNO3 and soybean peptone） as nitrogen source. Steady flow and dynamic viscoelastic measurements showed that the welan sample （0.5%, w/v） derived from combined nitrogen exhibited stronger solid-like behavior and independence of angular frequency. However, the welan sample produced with dried corn syrup as nitrogen source exhibited stronger liquid-like behavi nitrogen showed larger average molecular wei dried corn syrup. and dependence of angular frequency. Also, the welan from combined t and narrower molecular weight distribution, as compared to the welan from

关 键 词：产碱杆菌 威兰胶 流变学 粘弹性 分子量 发酵 

分 类 号：TQ920.1[轻工技术与工程—发酵工程]