摘要
以假酸浆子胶质为研究对象,用BrookfieldRVDV-Ⅲ型数字流变仪考察了胶溶液的流变学基本特性,以及质量浓度(g/L,下同)、金属离子、糖种类、放置时间、体系pH值、温度、冻融处理等因素对其流变性能的影响。结果表明,胶质溶液是典型的剪切稀化型非牛顿流体,胶质量浓度越高(超过2g/L)时,剪切稀化现象越严重。同时溶液流变行为受温度、剪切速率、pH值等因素的影响。溶液黏度随体系温度的升高而降低,与温度的依赖关系服从Arrhenius公式。5g/L的胶质溶液黏度在pH值为3时最高可达0.152Pa.s。但在强酸、强碱下黏度下降。金属二价离子对胶溶液有显著的增稠效应,其增稠效果与离子浓度呈正相关。在相同浓度下,蔗糖的增稠效果优于葡萄糖。
The fundamental rheological properties of gum from seed of Nicandra physaloides （ L. ） Gaertn and the effects of factors, such as concentration（g/L, the same below）, metal ions, sugar, standing time, pH value, temperature, freezing-thawing treatment on rheological properties were researched with Brook field RVDV-Ⅲ rheometer. Results indicated that gum solution had typical shear-thinning property, and the theological properties were influenced by temperature, shearing rate, pH value, freezing- thawing treatment, etc. It was found that the gum solution investigated behaved as non-Newtonian shear-thinning fluid. With the increase of gum concentration（above 2 g/L） , the consistency coefficient increased while the viscosity index decreased. The thixotropic response became stronger when gum concentration was increased. The increasing of temperature could reduce the viscosity of gum and the temperature dependence of η could be expressed by a relation of the Arrhenius equation. At pH value 3, the highest viscosity of aqueous solution （5 g/L） was 0. 152 Pa ·s, while strong acid and strong base resulted in a decrease in viscosity. Bivalent metal ions obviously improved the viscosity of gum solution, and the thickening effect was positively correlated to the concentration of metal ions. At the same concentration, the thickening effect of sucrose excelled glucose.
出处
《林产化学与工业》
EI
CAS
CSCD
2008年第2期38-42,共5页
Chemistry and Industry of Forest Products
基金
江南大学青年基金(104000-52210690)
关键词
假酸浆子胶
流变学性能
金属离子
糖
Nicandra physaloides （ L. ） Gaertn seed gum
theological property
metal ion
sugar
