Potentiometric determination of octanol-water and liposome-water partition coefficients (logP) of ionizable organic compounds

被引:31
|
作者
Barzanti, Claire [1 ]
Evans, Rebecca [1 ]
Fouquet, Jeremy [1 ]
Gouzin, Leonard [1 ]
Howarth, Nicola M. [1 ]
Kean, Gary [1 ]
Levet, Emilie [1 ]
Wang, Daniel [1 ]
Wayemberg, Estelle [1 ]
Yeboah, Agnes A. [1 ]
Kraft, Arno [1 ]
机构
[1] Heriot Watt Univ, Sch Engn & Phys Sci, Edinburgh EH14 4AS, Midlothian, Scotland
关键词
ionization constant; liposomes; octanol; partition coefficient; potentiometric titration;
D O I
10.1016/j.tetlet.2007.03.085
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
The logarithm of the octanol-water partition coefficient, log P, is a key physicochemical property for both pharmaceutical drugs and agrochemicals. It is also required by legislation as part of the physicochemical properties profile for high volume production chemicals. This Letter describes a simple method for determining log P values (over a wide range from -0.8 to 5.3) for 12 organic weak acids and bases using potentiometric titrations, with octanol or phosphatidyl choline liposomes as the partitioning medium. Such titrations take comparatively little time (about 30-45 min per titration), are easy to implement, and can be carried out with an inexpensive laboratory titrator. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3337 / 3341
页数:5
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