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- W2063995028 abstract "Crude extracts of meals of borage and evening primrose were prepared under optimum extraction conditions and were subjected to Sephadex LH-20 column chromatography. Six fractions from each of the crude extracts were obtained and their content of total, hydrophilic and hydrophobic phenolics determined. The crude extracts and their fractions [at 100 and 200 ppm as sinapic acid (for borage) or catechin (for evening primrose) equivalents] were investigated for their reactive-oxygen species- (ROS; H2O2, O2•-, •OH) and 2,2-diphenyl-1-picrylhydrazyl- (DPPH•) scavenging efficacies. Both types of crude extracts and their fractions exerted a concentration-dependent scavenging of ROS and DPPH•. At 200 ppm, borage crude extract and its fractions III, IV and V exhibited a 100% scavenging of H2O2 whereas evening primrose crude extract and its fraction III, at the same concentration, scavenged H2O2 completely. A complete quenching of O2•- was evident for assay media containing 200 ppm borage and evening primrose crude extracts/fractions with the exception of borage fraction V and evening primrose fraction I which showed about 75% quenching. At 200 ppm, borage and evening primrose crude extracts/fractions (except borage fractions I and III) exerted a complete quenching of •OH. Among the borage and evening primrose crude extracts/fractions investigated, only fraction VI of evening primrose, at 200 ppm, was able to completely quench DPPH•." @default.
- W2063995028 created "2016-06-24" @default.
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- W2063995028 date "2000-07-01" @default.
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- W2063995028 title "Scavenging of reactive-oxygen species and DPPH free radicals by extracts of borage and evening primrose meals" @default.
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- W2063995028 doi "https://doi.org/10.1016/s0308-8146(99)00269-1" @default.
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