Abstract
Gas chromatography–mass spectrometry (GC–MS) showed that CH 2Cl 2 extracts of the pelage from the Mexican free-tailed bats, Tadarida brasiliensis mexicana, contained only seven volatile compounds. They include two hydrocarbons, 1-octene and octane; three aldehydes, heptanal, octanal and nonanal; a carboxylic acid, nonanoic acid; and urea. It is likely that nonanal, at an average concentration 0.62 μg/mg hair, and the two homologues, heptanal and octanal found at 0.059 and 0.066 μg/mg hair, respectively, function as antimicrobial agents against mammalian skin bacteria and fungi. These three aldehydes may also act as a chemical protection against bat ectoparasites.
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