Determination of anti-giardial activity in vitro by means of soluble formazan production.

Abstract:

:A new microplate assay for the determination of activity in vitro against Giardia intestinalis has been developed in which viability is measured by soluble formazan production from a tetrazolium reagent. Metabolic reduction of the latter gives rise to a coloured product which may be determined directly by optical density measurement. Using this method the anti-giardial activities of more than 20 anti-microbial compounds have been assessed. The results obtained with a number of known anti-giardial agents, including metronidazole (50% inhibitory concentration [IC50] = 2.98 microM) and furazolidone (IC50 = 4.14 microM), compare well with previously published data; mepacrine, however, was found to produce a biphasic dose-response curve from which two IC50 values (0.816 and 6.83 microM) were obtained. This method provides a convenient means by which the search for new anti-giardial agents may be facilitated.

authors

Wright CW,Melwani SI,Phillipson JD,Warhurst DC

doi

10.1016/0035-9203(92)90093-r

subject

Has Abstract

pub_date

1992-09-01 00:00:00

pages

517-9

issue

5

eissn

0035-9203

issn

1878-3503

journal_volume

86

pub_type

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