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An analytical survey of the polyphenols of seeds of varieties of grape ( Vitis vinifera ) cultivated in Greece: implications for exploitation as a source of value‐added phytochemicals
Author(s) -
Guendez Ramila,
Kallithraka Stamatina,
Makris Dimitris P.,
Kefalas Panagiotis
Publication year - 2005
Publication title -
phytochemical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 72
eISSN - 1099-1565
pISSN - 0958-0344
DOI - 10.1002/pca.804
Subject(s) - chemistry , gallic acid , polyphenol , catechin , vitis vinifera , food science , epicatechin gallate , epigallocatechin gallate , composition (language) , horticulture , botany , biochemistry , biology , linguistics , philosophy , antioxidant
Seed samples from 12 white and 25 red international and Hellenic native grape varieties ( Vitis vinifera ) were screened for their polyphenolic composition. The polyphenols determined were mainly of low molecular weight, including gallic acid, catechin, epicatechin, epicatechin gallate, epigallocatechin, epigallocatechin gallate and the procyanidins B 1 and B 2 . Average values of total content for white and red varieties (376 and 388 mg/100 g seeds, respectively) were very similar. Comparable results were observed with respect to the individual polyphenol content with seeds from red varieties being, in general, slightly richer. The predominant avanol monomer in white and red varieties was catechin (which accounted for 50.5 and 49.3%, respectively, of the total content), whilst gallic acid and epigallocatechin were the constituents showing the lowest content, respectively. The data obtained are discussed with regard to the exploitation of grape seeds as a low‐cost source of value‐added phytochemicals. Copyright © 2005 John Wiley & Sons, Ltd.