聚谷氨酸/聚乙烯醇水凝胶的制备及其性能表征
毕业论文关键词： γ-聚谷氨酸；水凝胶；固体发酵；溶胀动力学；机械性能
Preparation and characterization of poly glutamic acid/ polyvinyl alcohol hydrogel
Abstract：Use the Bacillus natto preserved in the laboratory, using soybean as raw material, made of solid fermentation of γ-poly glutamic acid, through methods such as point precipitation method and organic solvent precipitation and purification with poly glutamic acid, and then get the pure γ-poly glutamic acid crystallization by freeze drying can. In the premise of not adding any chemical reagent, the γ-poly glutamic acid and polyvinyl alcohol to react, repeated freezing and thawing 3 times after freeze drying, preparation of pH sensitive hydrogel. Swelling, swelling kinetics of the hydrogels in different pH buffer solution in, water retention, and the mechanical properties of hydrogel.The results show that, under the condition of pH=7.4 hydrogel swelling was the biggest, along with the pH rise and fall, swelling rate will become smaller, showing the response ability of pH sensitive hydrogel. Hydrogel composition has little effect on the swelling rate and change trend of time to reach the equilibrium swelling state required, each water gel samples are the first to experience a rapid swelling process, then the swelling rate decreased gradually and reached equilibrium swelling after 30min. And with the increase in γ-PGA amount, the equilibrium swelling ratio of hydrogel decreased, but increased water retention. At the same time with different proportion of hydrogels were studied mechanical properties.
KeyWords： γ-PGA；Hydrogels；Solid state fermentation；Swelling kinetics；Mechanical properties
目录
1 绪论 - 1 -
1.1 γ-聚谷氨酸的性质 - 1 -
1.1.1 吸水特性 - 1 -
1.1.2 生物降解性 - 1 -
1.1.3 γ-PGA的水解特性 - 1 -
1.2 γ-聚谷氨酸研究国内外研究现状概述 - 1 -
1.2.1 γ-聚谷氨酸的简介 - 1 -
1.2.2 γ-聚谷氨酸的研究现状 - 2 -
1.3 聚谷氨酸水凝胶的简介 - 3 -
1.3.1 聚谷氨酸水凝胶的结构与性质 - 3 -
1.3.2 聚谷氨酸水凝胶的应用 - 3 -
1.4 水凝胶的研究进展 - 4 -
1.5 国内外水凝胶发展概况 - 5 -
1.5.1 国内水凝胶研究概况 - 5 -
1.5.2 国外水凝胶研究概况 - 5 -
2 实验方法 - 5 -
2.1 实验材料 - 5 -
2.2 实验菌种 - 5 -
2.3 实验仪器 - 5 -
2.4 γ-聚谷氨酸制备方法 - 5 -
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