The objective of this paper was to determine cytotoxic and genotoxic properties of bean-corn extrudates (BCE) manufactured from a mixture of Red Kidney beanflour and cornflour towards Caco-2 and HT-29 MTX neoplastic cells in human intestinal epithelium. In order to reproduce the in vivo conditions, the product examined was subjected to actions of digestive agents and intestinal microflora by simulating its passage along the alimentary tract. The cytotoxic potential of BCE before and after the digestion was determined using a hemocytometer to estimate the proliferation rate, and an MTT assay to evaluate the viability of cells. Moreover, the effect of BCE was investigated on a level of DNA damage in intestinal epithelium cells that were either stimulated or not stimulated by H2O2. The results obtained showed a high anti-proliferation activity of BCE that depended on its concentration level. The determined values of IC50 doses applied to Caco-2 and HT-29 MTX were 9.24 and 3.55% (w/v), respectively. The in vitro digestion process with a long term exposition of BCE to the action of intestinal microflora caused a significant increase in the cytotoxic effect on HT-29 MTX cells. The comet assay results showed that BCE did not induce DNA lesions in the intestinal cells, but it had a protective action towards the oxidative damages in DNA induced by 100 µM H2O2 in HT-29 MTX cells.
corn-bean extrudate, Red Kidney bean, cytotoxicity, Caco-2, HT-29 MTX