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Xenobiotica
the fate of foreign compounds in biological systems
Volume 21, 1991 - Issue 5
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Original Article

Molecular association enhances the toxic effects of non-substituted monoterpene suspensions on isolated mitochondria

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Pages 679-688 | Received 01 Oct 1989, Accepted 01 Jul 1990, Published online: 27 Aug 2009
 

Abstract

1. The effects of two, cyclic, non-substituted monoterpenes (betapinene and limonene) were studied on isolated mitochondria. Oxidative phosphorylation was inhibited depending on monoterpene concentration and on monoterpene association (droplet size) in aqueous suspension.

2. In the absence of hydration, both monoterpenes, dissolved in either dimethyl-formamide (DMF) or dimethylsulphoxide (DMSO), inhibited oxidative phosphorylation through depletion of the transmembrane potential and inhibition of oxygen consumption. Hydration of the monoterpene solutions before addition to mitochondria resulted in milder inhibitory effects. The decrease in inhibition was more pronounced with DMSO than with DMF.

3. The possibility that the biochemical properties of a compound in suspension may depend on molecular association should be considered whenever studies of a hydrophobic compound in an aqueous environment are conducted.

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