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
出处
《工业微生物》
CAS
CSCD
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
关键词
产碱杆菌
威兰胶
流变学
粘弹性
分子量
发酵
Sphingomonas sp
welan
rheology
viscoelastic
molecular weight
fermentation
