高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (8): 2574.doi: 10.7503/cjcu20210053

• 物理化学 • 上一篇    下一篇

油酸囊泡尺度多分散性及二元醇对其pH窗口的影响

樊晔1, 范梦琦1, 方云1(), 李磊1, 潘红阳2, 夏咏梅2   

  1. 1.江南大学化学与材料工程学院, 合成与生物胶体教育部重点实验室
    2.食品科学与技术国家重点实验室, 无锡 214122
  • 收稿日期:2021-01-23 出版日期:2021-08-10 发布日期:2021-08-05
  • 通讯作者: 方云 E-mail:yunfang@126.com
  • 基金资助:
    国家自然科学基金(21606107)

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)

摘要:

以油酸(OA)为模型脂肪酸, 依据目测激光丁达尔现象在pH滴定曲线上划分相区, 确定OA囊泡化pH窗口为8.2~10.1. 利用光学显微镜、 激光共聚焦显微镜和冷冻刻蚀-透射电子显微镜共同表征了OA囊泡的形貌及粒径, 发现体系中微米和亚微米级的多层囊泡以及纳米级的单层囊泡共存, 呈现尺度多分散性. 用不同链长的短链二元醇辅助OA形成囊泡, 结果表明, 短链二元醇有助于脂肪酸囊泡(FAV)的pH窗口拓宽, 拓宽的方向取决于表面氢键作用方式或疏水插入方式. 在酸性条件下二元醇与FAV相互作用后, 在囊泡表面残留的自由羟基越多, 越有助于拓宽其酸性pH窗口.

关键词: 油酸, 脂肪酸囊泡, 多分散性, 二元醇, pH窗口

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

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