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Antioxidant and cytoprotective activities of extracts prepared from fruit and vegetable wastes and by-products
- Kabir, Faisal, Tow, Wei Wei, Hamauzu, Yasunori, Katayama, Shigeru, Tanaka, Sachi, Nakamura, Soichiro
- Food chemistry 2015 v.167 pp. 358-362
- antioxidant activity, antioxidants, buckwheat, byproducts, ethanol, grape seed extract, kidneys, monkeys, oxidative stress, polyphenols, protective effect, vegetables, wastes
- In this study, fruit and vegetable wastes and by-products were tested for polyphenol content and their antioxidant activity. The highest content of polyphenols as assessed by the Folin–Ciocalteu assay was the hot-water extract of grape seed, followed by the ethanol extract of buckwheat hull. The highest antioxidant activity measured by 2,2-diphenyl-1-picryl-hydrazyl (DPPH) assays was also detected in the hot-water extract of grape seed, followed by the ethanol extract of immature prune. Most of samples showed protective effects against oxidative stress induced by 2,2′-azobis-(2-amidinopropane) dihydrochloride (AAPH) peroxyl radical generator in African monkey kidney (MA 104) cells. Samples containing high amounts of phenolics (more than 30mgChAE/g) generally showed high antioxidant activity and a protective effect against AAPH-induced oxidative stress. This study demonstrates that fruit and vegetable wastes and by-products are good sources of high amounts of phenolics with antioxidant properties.