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Desmutagenic Effect of Water Extract from Cassia tora L. on the Mutagenicity of N-methyl-N-nitro-N'-nitrosoguanidinein in E. coli PQ37  

Ahn, Byung-Yong (Department of Oriental Medicine Resources, Chonbuk National University)
Publication Information
Journal of Food Hygiene and Safety / v.24, no.1, 2009 , pp. 46-49 More about this Journal
Abstract
The desmutagenic activity of the water extract of Cassia tara L on the mutagenicity induced by 4-nitroquinoline 1-oxide (4-NQO) and N-methyl-N-nitro-N'-nitrosoguani-dine (MNNG) was studied using the SOS Chromotest with Escherichia coli PQ37. The inhibition rates of water extract of Cassia tara L. at concentration of $100{\mu}g$/assay were 27.5% and 40% against 4-NQO and MNNG. The water extract of Cassia tara L. was separated into methanol soluble and methanol insoluble parts. The methanol soluble part exhibited higher inhibition effects than the methanol insoluble part against the mutagenic activities of 4-NQO and MNNG. Step-wise fractionation of methanol soluble part was done to obtain methanol, ethyl acetate and water fractions. Among these fractions, water fraction had the strongest inhibitory effects of 23.0 and 19.0% against mutagenicities of MNNG and 4NQO, respectively. The results clearly indicated that the water fraction showed much stronger antimutagenicity against MNNG than 4NQO. The inhibition rates of aqueous fraction of methanol-soluble from water extracted Cassia tara L. at concentrations of 1.0, 10, 100 and $250{\mu}g$/assay were 8.0%, 12.0%, 25.5% and 43.0%, respectively. The water fraction showed the inhibitory effects with dose response against the mutagenic activities induced by MNNG.
Keywords
Cassia tara L.; 4-NQO; MNNG; SOS Chromotest; desmutagenic activity;
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