Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (8): 2574.doi: 10.7503/cjcu20210053

• Physical Chemistry • Previous Articles     Next Articles

Size Polydispersity of Oleic Acid Vesicles and Effects of Diols on the pH Window of the Vesicles

FAN Ye1, FAN Mengqi1, FANG Yun1(), LI Lei1, PAN Hongyang2, XIA Yongmei2   

  1. 1.Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,School of Chemical and Material Engineering
    2.State Key Laboratory of Food Science and Technology,Jiangnan University,Wuxi 214122,China
  • Received:2021-01-23 Online:2021-08-10 Published:2021-08-05
  • Contact: FANG Yun E-mail:yunfang@126.com
  • Supported by:
    the National Natural Science Foundation of China(21606107)

Abstract:

Oleic acid(OA) was selected as a model fatty acid, and the pH window of OA vesicles was 8.2—10.1 confirmed by phase division in the pH titration curve depending on the observation of laser Tyndall effects. Particle sizes and morphology of the OA vesicles were characterized by optical microscopy, confocal laser microscopy and freeze-fracture transmission electron microscopy. It is found that the micro- and sub- micro-sized fatty acid vesicle(FAV) are multilamellar vesicles while nano-sized FAV are unilamellar vesicles, which coexist in the aqueous solution, indicating the size polydispersity of OA vesicles. A series of short-chain diols are used to assist the formation of OA vesicles, which showed that the short-chain diols are favorable for the pH window extension of FAV. The extension direction may depend on the modes of either surface hydrogen bonding or hydrophobic insertion. It is suggested that if more hydroxyl groups of the used diol remained on the FAV surface after interaction, the acidic pH window would extend.

Key words: Oleic acid, Fatty acid vesicle, Polydispersity, Diol, pH window

CLC Number: 

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