Eur J Drug Metab Pharmacokinet. 1988 Oct-Dec;13(4):231-40. doi: 10.1007/BF03190084.

Percutaneous absorption of 14C-labelled 2-chlorobenzaldehyde in rats. Metabolism and toxicokinetics.

European journal of drug metabolism and pharmacokinetics

E C Rietveld, R M Hoet, F Seutter-Berlage, J M Van Rossum

PMID: 3243317 DOI: 10.1007/BF03190084

Abstract

2-Chlorobenzaldehyde might be produced when a moist skin is exposed to the riot control agent CS. CS-hydrolysis to 2-chlorobenzaldehyde and malononitrile occurs both in vitro and in vivo. No quantitative data have thus far been reported with respect to the percutaneous absorption and the cutaneous biotransformation of 2-chlorobenzaldehyde. Percutaneous absorption, biotransformation and elimination of 14-C-labelled 2-chlorobenzaldehyde was investigated in the rat. Following IV (25 microliters/kg) and IP (37.5 microliters/kg) 14C-2-chlorobenzaldehyde administration to rats, the plasma radioactivity declined rapidly over a 24 h period with similar plasma radioactivity-time profiles. Following cutaneous administration (75 microliters/kg) in a closed glass-cup on the skin a slow skin penetration occurred as indicated by plasma radioactivity levels. A slow increase in plasma radioactivity was followed by a slow decline of radioactivity in plasma over a 3-day period. Most of the radioactivity was found in the urine with low levels in faeces and exhaled air. The cutaneously administered radioactivity was also partly recovered from the glass-cup. For the qualitative and quantitative determination of metabolites in urine, a thin layer chromatography-radioautography method was used. The metabolic patterns of urinary excreted metabolites following cutaneous application and systemic administration of 14C-2-chlorobenzaldehyde to rats were very similar. No parent compound was recovered from the rat urine. 2-Chlorohippuric acid was the principal urinary metabolite. Quantitatively, the urinary excretion of 14C-2-chlorobenzyl alcohol following cutaneous application differed substantially from that after the systemic administration. There was no evidence of storage in the skin or skin toxicity of 2-chlorobenzaldehyde following cutaneous application.

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Substances

• Benzaldehydes
• Carbon Radioisotopes
• 2-chlorobenzaldehyde

MeSH terms

• Animals
• Benzaldehydes / pharmacokinetics
• Biotransformation
• Carbon Radioisotopes
• Chromatography, Thin Layer
• Male
• Rats
• Rats, Inbred Strains
• Skin Absorption*

Publication Types

• Journal Article
• Research Support, Non-U.S. Gov't