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Investigation into the Genotoxicity of Water Extracts from Hypoxis Species and a Commercially Available Hypoxis Preparation


Correspondence to: Luc Verschaeve, Scientific Institute of Public Health, D.O. Public Health and Surveillance, Laboratory of Toxicology, J. Wytsman street 14, B-1050 Brussels, Belgium



We performed an in vitro evaluation of the genotoxic potential of water extracts from four Hypoxis species (Hypoxis hemerocallidea, H. colchicifolia, H. rigidula, H. acuminata) and a commercial preparation thereof using the neutral red uptake (NRU) assay, the alkaline comet assay and the cytome assay in human hepatoma HepG2 cells. The relative cytotoxicity of these samples was established by determining their NI50 values (50% inhibition of NRU), and these results were used for dose-finding in genotoxicity tests. None of the tested extracts were identified as genotoxic in both the alkaline comet assay and cytome assay. Copyright © 2012 John Wiley & Sons, Ltd.

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