Abstract
Partition coefficients of lipophilic organic compounds have been determined for the system plant cuticle/water. The cuticles were isolated enzymatically from leaves of rubber plant (Ficus elastica) and bitter orange (Citrus aurantium) and from fruits of tomato (Lycopersicon esculentum) and green pepper (Capsicum annuum). The sorption in cuticles of 4-nitrophenol, (2,4-dichlo-rophenoxy) acetic acid (2,4-D), 6-chloro-N-ethyl-N-(1-methylethyl)-1,3,5-triazine-2,4-diamine (atrazine), (2,4,5-trichlorophenoxy)acetic acid (2,4,5-T), pentachlorophenol (PCP), hexachlorobenzene (HCB), perylene, and 1,2-benzenedicarboxylic acid bis(2-ethylhexyl)ester (DEHP, bis(2-ethyl-hexyl)phthalate) can be predicted with fair accuracy from octanol/water partition coefficients. Logarithms of cuticle/water and octanol/water partition coefficients between 102 and 108 are correlated by linear regression equations with coefficients of correlation from 0.980 to 0.988. The ecotoxicological significance of sorption in cuticles is discussed in a simplified distribution model.
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