Characterization of chitosan-ferulic acid conjugates and their application in the design of β-carotene bilayer emulsions with propylene glycol alginate
Characterization of chitosan-ferulic acid conjugates and their application in the design of β-carotene bilayer emulsions with propylene glycol alginate
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DOI：
10.1016/j.foodhyd.2017.11.031
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发表时间：
2017-11
影响因子：
10.7
通讯作者：
Di Wang;Like Mao;Lei Dai;Fang Yuan;Yanxiang Gao
中科院分区：
文献类型：
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作者：
Di Wang;Like Mao;Lei Dai;Fang Yuan;Yanxiang Gao
目前的研究调查了壳聚糖-阿魏酸（FA）缀合物（CFC）的形成，以及CFC和海藻酸丙二醇（PGA）在设计β-胡萝卜素双层乳液中的应用。 CFC是基于碳二亚胺介导的偶联反应合成的，并通过FITR和1H NMR分析证实。所得CFC具有较高比例的FA接枝到壳聚糖上（83.20±0.81mg/g），并且表现出比FA更强的抗氧化活性，以及比单独壳聚糖更好的水溶性。 PGA和CFC带相反电荷，通过静电引力形成覆盖β-胡萝卜素乳液油滴的双层界面。结果表明，CFC的浓度影响β-胡萝卜素乳液中FA的界面含量、粒径和液滴的表面电荷。与含有 PGA 的壳聚糖或壳聚糖-FA 混合物 (CFM) 稳定的双层乳液相比，CFC 稳定的双层乳液在不同的环境压力（即 pH、热和离子强度）下表现出更好的乳化稳定性，并且在暴露于热处理和紫外线时表现出更高的 β-胡萝卜素稳定性。本研究中获得的知识可用于设计具有改进性能的生物活性化合物的双层乳液。
The current study investigated the formation of chitosan-ferulic acid (FA) conjugates (CFC), and the application of CFC and propylene glycol alginate (PGA) in designing β-carotene bilayer emulsions. CFC was synthesized based on the carbodiimide-mediated coupling reaction, which was confirmed by FITR and1H NMR analysis. The resulting CFC could have a high ratio of FA grafted onto chitosan (83.20 ± 0.81 mg/g) and exhibited stronger antioxidant activity than FA, and better water solubility than chitosan alone. Being oppositely charged, PGA and CFC formed bilayer interface covering the oil droplets of β-carotene emulsions through electrostatic attraction. The results showed that the concentration of CFC affected the interfacial content of FA, particle size, and surface charge of the droplets in β-carotene emulsions. Compared to chitosan or chitosan-FA mixture (CFM) stabilized bilayer emulsions with PGA, CFC stabilized bilayer emulsions showed better creaming stability against different environmental stresses (i.e., pH, heat and ionic strength) and higher β-carotene stability when exposed to thermal treatment and UV light. The knowledge obtained in the present study could be useful in designing bilayer emulsions for bioactive compounds with improved performance.