alexa Toxicological evaluation of the flavonoid-rich extract from Maydis stigma: Subchronic toxicity and genotoxicity studies in mice.
Toxicology

Toxicology

Journal of Drug Metabolism & Toxicology

Author(s): Peng KZ, Zhang SY, Zhou HL

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Abstract ETHNOPHARMACOLOGICAL RELEVANCE: Maydis stigma (corn silk) has a long history of use as a traditional herbal medicine or functional food in China and many other countries and has been listed in the Chinese Pharmacopea. However, little data about its potential toxicity is available. AIM OF THE STUDY: In this study, we evaluated the subchronic toxicity and genotoxicity of the flavonoid-rich extract from Maydis stigma (FMS) in mice. MATERIALS AND METHODS: In the subchronic toxicity study, the FMS was administered orally to mice at doses of 2.50, 5.00 and 10.00g/kg/day for 28 consecutive days. At the end of experiment, general clinical signs, mortality, haematological, biochemical and histopathological parameters were examined. The genotoxicity of FMS was also evaluated by the micronucleus assay and the sperm malformation assay. RESULTS: All animals survived until the scheduled necropsy, and no statistically significant or toxicologically relevant differences were observed in any of the FMS-treatment groups, compared with the control group. The no-observed-adverse-effect level (NOAEL) was determined as 10.00g/kg/day. Based on the results of the micronucleus assay and the sperm malformation assay, no evidence of genotoxicity was found either in somatic cells or germ cells even at an experimental upper limit dose (10.00g/kg/day). CONCLUSIONS: The results of the present studies might support the safe use of FMS as a functional food, food additive and natural remedy. Copyright © 2016 Elsevier Ireland Ltd. All rights reserved. This article was published in J Ethnopharmacol and referenced in Journal of Drug Metabolism & Toxicology

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