华南理工大学学报(自然科学版) ›› 2011, Vol. 39 ›› Issue (4): 99-104.doi: 10.3969/j.issn.1000-565X.2011.04.018

• 食品科学与技术 • 上一篇    下一篇

液相体系中SPI-葡聚糖复合物的制备及性质

齐军茹 卓秀英 杨晓泉   

  1. 华南理工大学 轻工与食品学院,广东 广州 510640
  • 收稿日期:2010-07-13 修回日期:2010-11-25 出版日期:2011-04-25 发布日期:2011-03-01
  • 通信作者: 齐军茹(1977-),女,博士,副教授,主要从事食品生物技术及蛋白质工程研究 E-mail:jrqi@scut.edu.cn
  • 作者简介:齐军茹(1977-),女,博士,副教授,主要从事食品生物技术及蛋白质工程研究
  • 基金资助:

    国家自然科学基金资助项目(31000758);华南理工大学中央高校基本科研业务费专项资金资助项目(2009ZM0145)

Preparation and Properties of SPI-Dextran Conjugate in Liquid System

Qi Jun-ru  Zhuo Xiu-ying  Yang Xiao-quan   

  1. School of Light Industry and Food Sciences,South China University of Technology,Guangzhou 510640.Guangdong,China
  • Received:2010-07-13 Revised:2010-11-25 Online:2011-04-25 Published:2011-03-01
  • Contact: 齐军茹(1977-),女,博士,副教授,主要从事食品生物技术及蛋白质工程研究 E-mail:jrqi@scut.edu.cn
  • About author:齐军茹(1977-),女,博士,副教授,主要从事食品生物技术及蛋白质工程研究
  • Supported by:

    国家自然科学基金资助项目(31000758);华南理工大学中央高校基本科研业务费专项资金资助项目(2009ZM0145)

摘要: 通过液相体系中的Maillard反应制备了大豆分离蛋白-葡聚糖共价复合物(SDC),采用十二烷基磺酸钠-聚丙烯酰胺凝胶电泳技术证实了大豆分离蛋白和葡聚糖产生了共价结合.利用圆二色光谱、凝胶渗透色谱以及差热扫描量热仪探讨了多糖共价键入后对大豆蛋白构象和功能性质的影响.结果表明:95%乙醇体系中,60℃下反应24 h制得的产物乳化活性较高,优于干热反应5 d的产物;蛋白质的二级、三级结构发生了变化,三级结构变得更为紧凑;热分析表明产物热稳定性提高.

关键词: 大豆分离蛋白, 葡聚糖, 共价复合物, Maillard反应

Abstract:

Soy protein isolate-dextran conjugate(SDC) was prepared via the Maillard reaction in a liquid system.Then,the covalent binding between dextran and the protein was confirmed using the SDS-polyacrylamide gel electrophoresis technology,and the molecular conformation and functional properties of the product with covalent binding were analyzed by means of circular dichroism spectrography,GPC and DSC.The results show that the product obtained after a 24h reaction in 95% ethanol system at 60℃ possesses better emulsifying activity than that dry-heated for 5d;and that significant structural changes occur in the secondary and the tertiary structures of the conjugate,with the tertiary structure being more compact.Moreover,an improvement of thermal stability of the product is revealed via thermal analysis.

Key words: soy protein isolate, dextran, covalent conjugate, Maillard reaction