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Xenobiotica
the fate of foreign compounds in biological systems
Volume 22, 1992 - Issue 12
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Research Article

Ester hydrolysis and conjugation reactions in intact skin and skin homogenate, and by liver esterase of rabbits

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Pages 1357-1366 | Received 13 Nov 1991, Accepted 15 Jul 1992, Published online: 22 Sep 2008
 

Abstract

1. Procaine, 2-chloroprocaine, ethyl aminobenzoate and methyl salicylate were added at various concentrations to liver esterase, supernatant of skin homogenate, or single-pass perfused ears of rabbits.

2. Vmax of product formation by purified liver esterase correlated with the rank order of the distribution coefficients (n-octanol/buffer) of the substrates and ranged between 11 and 1100 pmol/min per μg protein. Km values were between 20 and 50 μM.

3. No correlation was observed when the apparent enzyme kinetics, calculated by nonlinear adaptation, were compared with each other after substrate administration to skin, arterial influx, or incubation with skin homogenate.

4. An acid labile conjugate of ethyl 4-aminobenzoate was found, mainly during arterial perfusion and in supernatant of skin homogenate, after administration of ethyl 4-aminobenzoate.

5. Acetamidobenzoic acid was observed in quantities of about 10% of the free 4-aminobenzoic acid during dermal or arterial application of procaine. This metabolite was not found with ethyl 4-aminobenzoate.

6. The results from isolated rabbit ear perfusion differ quantitatively and qualitatively with those obtained from supernatant of skin homogenate or purified liver esterase.

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