食品与机械2012，Vol.28Issue(1)：32-34,3.DOI:10.3969/j.issn.1003-5788.2012.01.007
一株西藏灵菇嗜热链球菌产胞外多糖的流变学特性
Rheological properties of the exopolysaccharide produced by streptococcus thermophilus from tibetan kefir grain
摘要
Abstract
The rheological properties were studied of the exopolysac-charides(EPS) produced by a Streptococcus thermophilus strain from Tibetan kefir grain. The results showed that the aqueous EPS solution was a typical non-Newtonian pseudoplastic fluid, and its flow behavior was affected by its concentration, shearing rate, heat treatment, pH and Ca2+. The EPS had good abilities of thickening, its viscosity was 85. 63 mPa·s when concentration was 8. 6 mg/mL. The aqueous EPS solution had pseudoplastic characteristics, its viscosity decreased by 69. 9% when shearing rate increased from 20 to 60 r/min. The EPS is unstable during heat treatment, its viscosity decreased by 74. 4% when temperature rose from 20 to 100 °C , when heated at 60 °C and 80 °C for 150 min individually, its viscosity was influenced to some degrees. The EPS solution at pH 2-6 was relatively stable, while its viscosity at pH 8 and pH 10 greatly increased. The viscosity of EPS decreased markedly with Ca2+ concentration increasing.关键词
嗜热链球菌/胞外多糖/流变学特性Key words
streptococcus thermophilus/ exopolysaccharide/ rheological properties引用本文复制引用
毛志勇,姜淑娟,钱方,牟光庆..一株西藏灵菇嗜热链球菌产胞外多糖的流变学特性[J].食品与机械,2012,28(1):32-34,3.基金项目
辽宁省教育厅创新团队项目(编号:2009T013) （编号:2009T013）
