Evaluation of the antiradical and reducing properties of selected Greek white wines: correlation with polyphenolic composition
✍ Scribed by Eleni Psarra; Dimitris P Makris; Stamatina Kallithraka; Panagiotis Kefalas
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 123 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0022-5142
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The total hydroxycinnamate (THC) and total flavanol (TF) contents were determined in 26 selected Greek white wines of ‘Appellation of Origin of High Quality’ using well‐established spectrophotometric methodology. Furthermore, two parameters related to the antioxidant capacity of wines, the antiradical activity (A~AR~) and the reducing power (P~R~), were also determined using the stable DPPH· radical and a ferric reducing power assay respectively. THC content varied from 64.4 to 197.1 mg l^−1^ chlorogenic acid equivalents (CGAE), whereas TF content exhibited larger variation, ranging from 3.3 to 205.3 mg l^−1^ catechin equivalents (CTE). A~AR~ and P~R~ were found to range from 0.47 to 0.60 mM Trolox equivalents (TRE) and from 0.32 to 2.05 mM quercetin equivalents (QE) respectively. Regression analysis at 95% significance level indicated that reducing effects are likely to be exerted by the flavanol fraction (SF < 0.05), as opposed to antiradical efficiency which is primarily affected by the sum of THC and TF contents (SF < 0.05), suggesting that synergistic phenomena account for the overall antioxidant status of white wines.
© 2002 Society of Chemical Industry