Phenolic Profile,Antioxidant Capacity,and Antimicrobial Activity of Leaf Extracts from Six Vitis vinifera L. Varieties |
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| Authors: | Višnja Katalinic Sonja Smole Mozina Ivana Generalic Danijela Skroza Ivica Ljubenkov Anja Klancnik |
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| Affiliation: | 1. Department of Food Technology, Faculty of Chemistry and Technology , University of Split , Split , Croatia visnja@ktf-split.hr;3. Department of Food Science and Technology, Biotechnical Faculty , University of Ljubljana , Ljubljana , Slovenia;4. Department of Food Technology, Faculty of Chemistry and Technology , University of Split , Split , Croatia;5. SMS—Nutrition Development Centre , Klis , Croatia |
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| Abstract: | The phenolic composition, antioxidant activity, 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 ferric reducing antioxidant power and 2,2-diphenyl-1-picrylhydrazyl 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 the grape harvest could be especially promising as an inexpensive source of effective antioxidant/antimicrobial agents. |
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| Keywords: | Vine leaf phenolics Flavonoids Stilbenes Antimicrobial activity Antioxidant activity |
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