Abstract
A 23-full factorial design and response surface methodology were deployed to assess some basic factors (time, % ethanol and pH) affecting profoundly the extractability of polyphenolic phytochemicals from grape (V. vinifera) seeds. In an effort to obtain a thorough insight into the applicability of the models established, seed extracts from three different varieties were tested, by determining several indices of the polyphenolic composition, such as total polyphenol (TP), total flavanol (TFl) and proanthocyanidin (PC) concentrations. It has been shown that the models generated can adequately predict the recovery levels for each polyphenol group, but the optimal conditions predicted for TP, TFl and PC recovery varied significantly. Notable differences were also seen among the different varieties. Correlation of the polyphenol indices with the antiradical activity and reducing power of the extracts indicated that there is no consistent pattern to associate specific polyphenol classes with the antioxidant potential, which might be an evidence of antagonism. Examination of the optimally obtained extracts using liquid chromatography-mass spectrometry revealed that the most prominent compounds were catechin, some flavanol dimers and galloylated derivatives thereof.
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Abbreviations
- AAE:
-
Ascorbic acid equivalents
- AAR :
-
Antiradical activity
- CT:
-
Catechin
- CTE:
-
Catechin equivalents
- CTG:
-
Catechin gallate
- CyE:
-
Cyanidin equivalents
- ε:
-
Molar absorptivity
- GAE:
-
Gallic acid equivalents
- MW:
-
Molecular weight
- PC:
-
Proanthocyanidins
- PR :
-
Reducing power
- SD:
-
Standard deviation
- TFl:
-
Total flavanols
- TP:
-
Total polyphenols
- TRE:
-
Trolox equivalents
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Karvela, E., Makris, D.P., Kalogeropoulos, N. et al. Factorial design optimisation of grape (Vitis vinifera) seed polyphenol extraction. Eur Food Res Technol 229, 731–742 (2009). https://doi.org/10.1007/s00217-009-1105-1
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DOI: https://doi.org/10.1007/s00217-009-1105-1