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- W1986241460 abstract "An on-line HPLC-DPPH screening method for phenolic antioxidants in apple methanol/water (80:20, v/v) extracts was applied. The determination of antioxidants was based on a decrease in absorbance at 515 nm after postcolumn reaction of HPLC-separated antioxidants with the 2,2‘-diphenyl-1-picrylhydrazyl radicals (DPPH•). Each of the antioxidants separated by the HPLC column was observed as a negative peak corresponding to its antioxidative activity. The on-line method was applied for quantitative analysis of the antioxidants. A linear dependence of negative peak area on concentration of the reference antioxidants was observed. For validation of the on-line method the limit of detection, LOD (μg/mL), and the limit of quantification, LOQ (μg/mL), of the phenolic compounds were determined. Comparison of the UV and DPPH radical quenching chromatograms with authentic compounds identified catechin, chlorogenic acid, caffeic acid, epicatechin, and phloridzin in the apple cultivars (Lobo, Golden Delicious, and Boskoop), and the distribution of total antioxidant activity was calculated. Keywords: Radical scavenger activity; on-line HPLC-DPPH; phenols; apple extracts; Malus domestica L." @default.
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- W1986241460 date "2002-03-26" @default.
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- W1986241460 title "On-Line HPLC-DPPH Screening Method for Evaluation of Radical Scavenging Phenols Extracted from Apples (<i>Malus domestica </i>L.)" @default.
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- W1986241460 doi "https://doi.org/10.1021/jf011475s" @default.
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