Methanolic extracts of edible plants and seaweeds were tested for their inhibitory activity against Jack bean urease. Quercetin-4 0 -O--D-glucopyranoside was isolated from Allium cepa as a urease inhibitor with an IC 50 value of 190 M. Quercetin and two quercetin glycosides, avicularin and guaijaverin, were isolated from Psidium guajava as urease inhibitors with respective IC 50 values of 80 M, 140 M, and 120 M.
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Shabana et al. (2010) studied this question.
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