食品科学 ›› 2019, Vol. 40 ›› Issue (18): 28-34.doi: 10.7506/spkx1002-6630-20181031-375

• 食品化学 • 上一篇    下一篇

单月桂酸甘油酯接枝改性阿拉伯胶及其乳化性能

谢燕萍,张修齐,蔡志祥,张洪斌   

  1. (上海交通大学化学化工学院,流变学研究所,上海 200240)
  • 出版日期:2019-09-25 发布日期:2019-09-23
  • 基金资助:
    “十三五”国家重点研发计划重点专项(2016YFD0400200);国家自然科学基金面上项目(21774075)

Emulsifying Properties of Glyceryl Monolaurate Grafted Gum Arabic

XIE Yanping, ZHANG Xiuqi, CAI Zhixiang, ZHANG Hongbin   

  1. (Advanced Rheology Institute, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)
  • Online:2019-09-25 Published:2019-09-23

摘要: 采用单月桂酸甘油酯(glyceryl monolaurate,GML)对其接枝改性,并对比探讨不同投料比(GML/阿拉伯胶(gum arabic,GA)=0%、5%、10%、20%)条件下,所得改性产物(GML-GA)的乳化性能和对油水乳液稳定性的影响。研究发现,改性并未改变溶液牛顿流体的本体流变学性质,但改性产物(GML-GA)的乳化性能和对油水乳液的稳定性显著提高。改性产物的乳化性随投料比增加呈现先提高而后略有下降的趋势,其中GML/GA投料比为10%的改性产物乳化性能最高。由于GML可能主要被接枝于GA中的高含量组分阿拉伯半乳聚糖(arabinogalactan,AG)分子上,因此相比于乳化性能仅源于阿拉伯半乳聚糖蛋白(arabinogalactan protein,AGP)组分贡献的GA,改性产物GML-GA乳化能力的提高则源于AGP和改性AG双组分的贡献。

关键词: 阿拉伯胶, 单月桂酸甘油酯, 乳化性能, 乳液稳定性, 接枝改性, 天然乳化剂

Abstract: In order to improve the emulsification performance of gum arabic (GA), in the present work, glyceryl monolaurate (GML) was grafted with GA. The emulsifying properties and the effect on the stability of oil-in-water emulsions of various grafted products (GML-GA) prepared at different mass ratios of GML to GA of 0%, 5%, 10% and 20% were contrastively investigated. Bulk rheological results indicated that both GA and GML-GA aqueous solutions behaved as Newtonian fluids. The emulsifying properties of GML-GA and the stability of oil-in-water emulsions with GML-GA were significantly enhanced in comparison with GA. The emulsifying properties of GML-GA were improved and then decreased with increasing the GML content, and the best emulsification performance was obtained at a GML to GA ratio of 10%. The emulsification activity of GA was attributed to its content of arabinogalactan protein (AGP). As GML molecules were probably mainly grafted onto AG, the most abundant component in GA, the improved emulsification of the GML-GA products was due to the presence of both AGP and GML-grafted AG.

Key words: gum arabic, glyceryl monolaurate, emulsifying properties, emulsion stability, grafting modification, natural emulsifier

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