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Experimental data are presented on the partition coefficients of 14 polychlorinated biphenyls (PCBs) between four species of saturated 1,2-diacyl-sn-glycero3-phosphocholine membrane vesicles and aqueous buffer. Small unilamellar vesicles of dimyristoylphosphatidylcholine (DMPC), dipalmitoylphosphatidylcholine (DPPC), distearoylphosphatidylcholine (DSPC), and diarachidoylphosphatidylcholine (DAPC) show a high affinity for extreme hydrophobic xenobiotics such as the PCBs in this study. Observed membrane-water partition coefficients K mw of the PCBs, with log K ow values ranging from 5.3 to 8.26, in membrane lipid vesicles were in the following order : DPPC > DMPC > DSPC > DAPC. Beside the hydrophobicity of the PCBs, the order of the K mw values is primarily determined by the fluidity of the membrane bilayer. Atthe experimental temperature of 37°C for every PCB, a correlation exists between log K mw and the membrane lipid main phase transition temperature T m . In comparison to the bulk solvent 1 -octanol, the membrane lipid phase is highly structured and the correlation between log K mw and both the molar liquid volume MLV of the PCBs and their log K ow is nonlinear.

Membrane-Water Partitioning of Polychlorinated Biphenyls in Small Unilamellar Vesicles of Four Saturated Phosphatidylcholines