期刊
CHEMISTRY AND PHYSICS OF LIPIDS
卷 104, 期 1, 页码 93-99出版社
ELSEVIER SCI IRELAND LTD
DOI: 10.1016/S0009-3084(99)00109-7
关键词
area per molecule; beta-cyclodextrin; dipole moment; monomolecular film desorption; oxidized free fatty acid; surface pressure
The interfacial properties of monomolecular films of stearic acid (SA) oleic acid (OA), linoleic acid (LA), ricinoleic acid (RA), 13(S)-hydroperoxyoctadeca-9Z, 11E-dienoic acid (13-HPODE) and 13(S)-hydroxyoctadeca-9Z, 11E-dienoic acid (13-HODE) were studied by recording the changes occurring in response to monomolecular film compression in their surface pressure and surface potential at the argon/water interface. The oxidized free fatty acids are more expanded than the parent non-oxidized free fatty acids, reflecting a higher hydrophilic-lipophilic balance. The lift-off values of the molecular area of 13-HODE, 13-HPODE and RA were 68, 74 and 106 Angstrom(2) molecule(-1), respectively, as compared to 47 and 40 Angstrom(2) molecule(-1) in the case of LA and OA, respectively. Variations in the molecular orientation of free fatty acids can result in large changes in the dipole moment which are not accompanied by appreciable changes in the surface pressure. In the case of the oxidized free fatty acids, the spontaneous desorption into the aqueous phase was found to increase at increasing surface pressures. The desorption rates of OA and LA increased dramatically in the presence of P-cyclodextrin (P-CD); whereas the presence of P-CD only slightly increased the desorption rates of the oxidized free fatty acids. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据