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Contributions of phenolics and added vitamin C to the antioxidant capacity of pomegranate and grape juices: synergism and antagonism among constituents

机译:酚类和添加的维生素C对石榴和葡萄汁的抗氧化能力的贡献:成分之间的协同作用和拮抗作用

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摘要

The aim of this study was to examine the contribution of sugar, organic acid, neutral phenol, and anthocyanin fractions and added ascorbic acid to grape and pomegranate-nectarine juice total phenol, ORAC, FRAP, and DPPH values. Neutral phenol and anthocyanin fractions contributed ≥75% of the total antioxidant capacity (TAC) for both juices. Intrinsic synergy and antagonism among the fractionated constituents occurred inconsistently in each assay. Sugars and organic acids antagonized pomegranate juice neutral phenols and anthocyanins in the DPPH assay by 50% and the grape juice ORAC value by 21%, but were synergistic to the grape juice FRAP value. The added ascorbic acid was dose-dependently synergistic with pomegranate and grape juice total phenol, DPPH, and FRAP assays, but less so in the ORAC assay. Thus, the interactions between grape and pomegranate juice constituents determine TAC and total phenol values, and synergy in these assays could not be attributed solely to polyphenols.
机译:这项研究的目的是检查糖,有机酸,中性酚和花青素的成分,并向葡萄和石榴油桃汁中的总酚,ORAC,FRAP和DPPH值添加抗坏血酸。对于两种果汁,中性酚和花色苷组分占总抗氧化剂能力(TAC)的≥75%。在每种测定中,分级成分之间的内在协同作用和拮抗作用均不一致。在DPPH分析中,糖和有机酸拮抗石榴汁中性酚和花色苷的比例为50%,葡萄汁的ORAC值为21%,但与葡萄汁的FRAP值具有协同作用。添加的抗坏血酸与石榴和葡萄汁中的总酚,DPPH和FRAP分析呈剂量依赖性协同作用,但在ORAC分析中则较少。因此,葡萄汁和石榴汁成分之间的相互作用决定了TAC和总酚值,并且这些测定法中的协同作用不能仅归因于多酚。

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