高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (8): 20220144.doi: 10.7503/cjcu20220144

• 物理化学 • 上一篇    下一篇

胺类分子结构对油酸囊泡pH窗口的影响

李磊1,2, 方云2(), 夏咏梅1(), 范梦琦2, 樊晔2   

  1. 1.江南大学食品科学与技术国家重点实验室
    2.化学与材料工程学院, 合成与生物胶体教育部重点实验室, 无锡 214122
  • 收稿日期:2022-03-07 出版日期:2022-08-10 发布日期:2022-04-28
  • 通讯作者: 方云,夏咏梅 E-mail:yunfang@126.com;ymxia@jiangnan.edu.cn
  • 基金资助:
    国家自然科学基金(21606107);国家重点研发计划项目(2017YFB308705)

Effects of Amine Structures on the pH Window of Oleic Acid Vesicle

LI Lei1,2, FANG Yun2(), XIA Yongmei1(), FAN Mengqi2, FAN Ye2   

  1. 1.State Key Laboratory of Food Science and Technology
    2.Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,China
  • Received:2022-03-07 Online:2022-08-10 Published:2022-04-28
  • 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)

摘要:

基于激光丁达尔效应及浊度测定, 考察了改变二元胺的碳桥长度、 多元胺的氨基多寡、 长链伯胺的碳链长度及季铵化等因素对油酸囊泡pH窗口的影响. 结果表明, 二元胺及多元胺主要导致油酸囊泡的pH窗口向碱性方向拓宽, 而长链伯胺和十二烷基三甲基溴化铵(DTAB)不仅可使油酸囊泡的pH窗口向碱性拓宽, 而且可使油酸在酸性pH区域形成另一个介稳至稳定的新囊泡相. 氨基在不同pH下质子化和脱质子化转换是胺类分子调节油酸囊泡pH窗口的共同驱动力, 疏水作用是长链胺类的又一驱动力, 而静电吸引是季铵盐的另一种特殊驱动力. 分子间相互作用的热力学参数及结合能计算结果表明, 二乙烯三胺为代表的二元胺或多元胺在油酸囊泡表面以氢键或离子-偶极作用等非共价结合为主, 其调节功能弱于长链伯胺及DTAB与油酸的疏水共组装或DTAB与油酸的静电吸引作用.

关键词: 脂肪酸囊泡, 油酸, 胺, pH窗口, 丁达尔效应

Abstract:

The pH window of oleic acid vesicle(OAV) was defined by laser Tyntall effect and turbidity observation, and effects of amine structure on the pH window were investigated involving in spacer lengths of diamines, numbers of amino groups in polyamines, alkyl chain lengths of primary fatty amines and quaternization. It is found that diamines and polyamines could mostly extend the pH window of OAV into the alkaline region, while primary fatty amines and dodecyltrimethylammonium bromide(DTAB) could result in a new metastable to stable vesicular phase at the low pH region besides the above window extension. Regulation of the pH window of OAV driven by amines is generally relying on transformation between protonation and deprotonation of amino groups under different pH, while cooperating with hydrophobic interaction of fatty amines or electrostatic attraction of DTAB. Thermodynamic parameters for molecular interactions and binding energy calculation show that the non-covalent bonding of diethyle-netriamine, as a representative of diamines or polyamines, with the OAV surface is dominated by hydrogen bond or ion-dipole interaction, which has weaker effect on the pH window of OAV than the hydrophobic co-assembly with primary fatty amines or electrostatic attraction with DTAB.

Key words: Fatty acid vesicle, Oleic acid, Amine, pH window, Tyntall effect

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