Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (4): 20210860.doi: 10.7503/cjcu20210860

• Physical Chemistry • Previous Articles     Next Articles

Comparative Effects of Mono/disaccharides on Conjugated Linoleic Acid Vesicles at Near Neutral pH

LI Lei1,2, FANG Yun2(), XIA Yongmei1(), BO Chunling2, FAN Ye2   

  1. 1.State Key Laboratory of Food Science and Technology,Jiangnan University,Wuxi 214122,China
    2.Key Laboratory of Synthetic and Biological Colloids(Ministry of Education),School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,China
  • Received:2021-12-27 Online:2022-04-10 Published:2022-02-16
  • Contact: FANG Yun,XIA Yongmei E-mail:yunfang@126.com;ymxia@jiangnan.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21606107);the National Key Research and Development Program of China(2017YFB0308705)

Abstract:

Effects of three disaccharides such as lactose and three monosaccharides such as ribose and their mixtures on the formation of fatty acid vesicles(FAV) of conjugated linoleic acid(CLA) in the near-neutral pH range were compared. The pH windows of FAV and phase regions were determined by laser Tyndall effect, the morphology and size of FAV were characterized by transmission electron microscopy and dynamic light scattering, the stabilities of FAV were studied by turbidimetry, the weak non-covalent binding of various saccharides and their mixtures on the FAV surface was proved by isothermal titration calorimetry, and the binding energies were calculated theoretically. The experimental and computational results show that all saccharides and their mixtures can both-side extend the pH window of FAV, and the near neutral-side pH window extends in the following order: disaccharide < monosaccharide ≈ disaccharide/monosaccharide ≤ monosaccharide/monosaccharide. It mainly comes down to the stronger compe-titive adsorption of monosaccharides than disaccharides on the FAV surface. Additionally, the possible multi-binding site adsorption of disaccharides on FAV surface may result in weaker association between the free hydroxyl groups of disaccharides and environmental water molecules than monosaccharides, which makes negative contribution to the enhanced hydrophilicity of the FAV surface relying on polyhydroxyl groups of small molecules.

Key words: Fatty acid vesicle, Conjugated linoleic acid, Disaccharide, Monosaccharide, pH Window

CLC Number: 

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