丝胶的触变性研究

Study on the Thixotropy of Sericin

摘要: 丝胶是一种水溶性球状蛋白，是蚕丝的主要成分之一。一直以来，丝胶的药用价值、食用价值被人们所熟知，而丝胶凝胶的触变性却很少有学者研究。将丝胶溶液置于常温条件下时，丝胶溶液形成凝胶。此时，对丝胶溶液施加一定剪切力，丝胶凝胶出现可逆溶胶现象，表现出触变性。本文从丝胶凝胶临界浓度、触变性表征、结构变化及截面形态研究了高温高压制备的丝胶的触变性。结果表明，高温高压条件下制备的丝胶溶液常温条件下凝胶临界浓度为0.3%；丝胶凝胶触变作用前后不发生聚集态结构变化；丝胶的再凝胶过程仍与丝胶含固量和温度有关。

Abstract: Sericin has been proved to be a nature water soluble globular protein and is one of the main com- ponents of silk. As is known for its culinary and medical properties all the time, thixotropy property of the sericin has never been studied. When placed at room temperature for several hours, sericin solution forms gel. Then, applied a sequential set of shearing forces into the sericin gel, it exhibits reversible gel-sol changes and turns out to be thixotropy. The paper describes the critical gel concentration of sericin solutions, thixotropy characterization and structure. The result indicated that sericin prepared from silk cocoon under high pressure and high temperature can form gel even diluted at concentration 0.3 wt%. The structure of sericin didn’t change after shear action. The regelation process is dependent on concentration and temperature.