食品科学 ›› 2017, Vol. 38 ›› Issue (19): 7-11.doi: 10.7506/spkx1002-6630-201719002

• 基础研究 • 上一篇    下一篇

两种海藻酸钠基凝胶的溶胀和质构性能

覃小丽,杨 溶,刘 雄,肖沁林,张 月,郭康乐,钟金锋*   

  1. 西南大学食品科学学院,重庆 400715
  • 出版日期:2017-10-15 发布日期:2017-09-29
  • 基金资助:
    国家自然科学基金青年科学基金项目(31501446;31601430); 中央高校基本科研业务费专项资金项目(XDJK2016B034;XDJK2017B040); 重庆市基础科学与前沿技术研究专项(cstc2015jcyjA80013;cstc2017jcyjAX0036); 重庆市现代特色效益农业调味品产业技术体系资金项目(2017[7])

Swelling Characteristics and Textural Properties of Two Kinds of Sodium Alginate-Based Hydrogels

QIN Xiaoli, YANG Rong, LIU Xiong, XIAO Qinlin, ZHANG Yue, GUO Kangle, ZHONG Jinfeng*   

  1. College of Food Science, Southwest University, Chongqing 400715, China
  • Online:2017-10-15 Published:2017-09-29

摘要: 壳聚糖、果胶和海藻酸钠是天然多糖,具有良好的生物相容性和生物可降解性等优点。以CaCl2为交联剂 制备壳聚糖-海藻酸钠水凝胶和果胶-海藻酸钠水凝胶,研究CaCl2浓度、多糖质量比(壳聚糖与海藻酸钠、果胶与 海藻酸钠)和交联温度对水凝胶在模拟人体胃肠道环境(pH 1.2胃、pH 6.8小肠、pH 7.4结肠缓冲溶液)中溶胀性 能的影响。当壳聚糖或果胶和海藻酸钠质量比为1.25∶1、CaCl2浓度为0.09 mol/L、温度为60 ℃时,制备的水凝胶在 pH 1.2溶液中溶胀率最小,在pH 6.8和pH 7.4溶液中溶胀率较大;结果表明所制备水凝胶具有pH值敏感性。此外, 在优化条件下水凝胶具有较好的质构性能。

关键词: 海藻酸钠, 水凝胶, 溶胀率, pH值敏感性

Abstract: Chitosan, pectin and sodium alginate are all natural polysaccharides that are biocompatible and biodegradable. Chitosan-alginate hydrogel and pectin-alginate hydrogel were prepared by using CaCl2 as the cross-linking agent. The effect of CaCl2 concentration, the mass ratios of chitosan to sodium alginate and pectin to sodium alginate and cross-linking temperature on swelling properties of hydrogels in simulated gastrointestinal environments (gastric, small intestinal and colonic buffer solutions at pH 1.2, 6.8 and 7.4, respectively) were investigated. The results showed that swelling ratio of hydrogels prepared by cross-linking of chitosan or pectin and sodium alginate at a mass ratio of 1.25:1 with 0.09 mol/L CaCl2 added at 60 ℃ was low at pH 1.2 and high at pH 6.8 and 7.4, suggesting that the hydrogels had significant pH-sensitivity. In addition, the hydrogels had good textural properties.

Key words: sodium alginate, hydrogel, swelling ratio, pH-sensitivity

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