Abstract

The binding of chlorinated hydrocarbon, carbamate and organophosphate insecticides to human low density plasma lipoproteins (LDL) and high density plasma lipoproteins (HDL) was studied at pH 7.0 and 16°C and 26°C by equilibrium dialysis, difference spectra and fluorescence. The results suggest interaction to be a partitioning rather than a stoichiometric binding process. Distribution is related to lipid content and composition of the lipoproteins. The K-values vary from 3 × 10 5 M −1 for 1,1,1-trichloro-2,2-bis( p-chlorophenyl)ethane (DDT) to less than 10 M −1 for nicotine and aldicarb, and Δ G tr∘ is in the range of 7400 cal for DDT to less than 1000 cal for aldicarb and nicotine. The K and Δ G tr∘ are inversely related to the water solubility of the insecticides. A significant role of plasma lipoproteins in the transport of slightly water soluble insecticides is suggested.

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