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• W1491182318 abstract "Chlorinated hydrocarbons, such as the pesticide lindane (γ-hexachlorocyclohexane), quench the fluorescence of carbazole. The observed quenching is a result of the molecular contacts which occur upon diffusional collisions. Because the amount of quenching depends upon the collisional frequency between carbazole and pesticide, this phenomenon provides a measure of both the diffusional rate of lindane and its local concentration. The carbazole fluorophore is localized within phosphatidylcholine bilayers by cosonicating the lipid with a newly synthesized phospholipid, β-(11-(9-carbazole)-undecanoyl)-l-α-phosphatidylcholine. Using this probe in dimyristoyl-l-α-phosphatidylcholine vesicles, and the above mentioned quenching phenomena, we determined the lindane diffusion rate within the bilayer to be 5.7 · 10−7cm2/s at 37°C. Measurement of the apparent quenching constant at various dimyristoyl phosphatidylcholine concentrations yielded a lipid-water partition coefficient for lindane of 9500, which is in agreement with the value of 8980 obtained by our equilibrium dialysis experiments. Vesicles of dimyristoyl-l-α-phosphatidylcholine become saturated with lindane at a pesticide to lipid molar ratio of approx. 0.28. These results demonstrate the possibility of using the quenching of carbazole fluorescence to investigate the transport and partitioning of pesticides within biological membranes. This ability should prove useful in studies of the interactions of chlorinated hydrocarbons with cell membranes." @default.
• W1491182318 created "2016-06-24" @default.
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• W1491182318 date "1977-12-01" @default.
• W1491182318 modified "2023-09-27" @default.
• W1491182318 title "Diffusion and partitioning of a pesticide, lindane, into phosphatidylcholine bilayers" @default.
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• W1491182318 doi "https://doi.org/10.1016/0005-2736(77)90045-1" @default.
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