engleski

Phenolic profile, antioxidant capacity and antimicrobial activity of crude leaf extracts of six Vitis vinifera L. varieties

The phenolic composition, antioxidant and antimicrobial activity of extracts from vine leaves of six grape varieties collected in May, August and September was studied. The phenolic potential of the extracts was dependent on variety and picking-time. Extracts of leaves collected in September were the richest in total phenols, flavonoids, flavonols and stilbenes. The antioxidant properties determined by FRAP and DPPH assays, and antimicrobial activity against Stapylococcus aureus, Bacillus cereus, Campylobacter jejuni, Escherichia coli and Salmonella Infantis were good and in correlation with the chemical composition changes of the leaf extracts. The results indicated that leaves remaining on the vine in September after grape harvest could be especially promising as an inexpensive source of effective antioxidant/antimicrobial agents.

antimicrobial activity; antioxidant activity; grape-leaf phenolics

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