1887

Abstract

Whole garlic ( L.) extract and some of its components were assayed for antigiardial activity. Whole garlic extract gave an IC at 24 h of 03 mg ml. Most of the components assayed were inhibitory to the organism, especially allyl alcohol and allyl mercaptan, with IC values of 7 μg ml and 37 μg ml respectively. Studies with calcofluor white indicated that whole garlic and allyl alcohol collapse the transmembrane electrochemical membrane potential (Δψ) of the organism, as indicated by uptake of the fluorochrome. Electron microscopy allowed the morphological changes that occur with garlic inhibition to be recorded. Both the surface topography and internal architecture of the organism changed during incubation with the biocides. Both whole garlic and allyl alcohol resulted in fragmentation of the disc and an overexpression of disc microribbons, internalization of flagella, vacuole formation and an increase in distended vesicles. Allyl mercaptan, however, only gave an increase in distended vesicles, suggesting that this biocide has a different mode of action.

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2000-12-01
2020-09-28
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