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• W2577853838 abstract "Brassica sp. are very rich in health-promoting phytochemicals, including flavonoids, hydroycinnamic acid derivatives and glucosinolates. Brassica phenolics show antioxidant activity and glucosinolates (and/or derived products obtained during processing and biological transformations) have shown an important activity as tumour inhibitors. Thus, phytochemicals are responsible for health promoting properties of broccoli, cauliflower and related vegetables. During the processing of these vegetables, an important amount of by-products is produced (leaves, stems, etc). The possible use of Brassica ssp. by-products as a source of antioxidant health-promoting phenolics has been studied. Two different solvents (ethanol and water) were used to obtain different extracts. Purified extracts using Amberlite XAD-2 absorption were prepared and their yield, phenolic content and antioxidant activity were studied. Water extraction produced an extract two times larger (53 glkg f.w.) than the ethanol extraction (26 glkg f.w.). The phenolic content of the extracts was evaluated by HPLC. Water extract contained 33.4 g per kg of extract (3.3%) and ethanol extract contained 64 g of phenolic compounds per kg of extract (6.4%). This percentage increased considerably in the extracts purified through Amberlite yielding 135 glkg (13.5%) (water extract) and 315 glkg extract (31.5%) (ethanol extract). Regarding Broccoli stems the phenolics were only present as traces. The antioxidant activity was evaluated by DPPH and ABTS methods. These results indicate that the water extract has a higher antioxidant activity (453 Trolox mMlloo g f.w.) than the ethanol extract (307 Trolox mM/loo g f.w.) and that an important part of these antioxidants are not retained in the Amberlite column (about 75% of antioxidant activity in both methods). However, when the antioxidant capacity is expressed on a freeze-dried extract basis, the ethanol extract was most active (120 mM Troloxlg freeze-dried extract) than that obtained by water extraction (85 mM Troloxlg freeze-dried extract). The results obtained indicate that the extraction of antioxidant substances using Brassica by-products can be very interesting for the industry, especially cauliflower by-products." @default.
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• W2577853838 date "2002-01-01" @default.
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• W2577853838 title "VALORIZATION OF BY-PRODUCTS OF THE HANDLING AND COMMERCIALIZATION OF VEGETABLES Possible use ofBrassica spp by-products as source of antioxidant health-promoting phenolics." @default.
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