Broad-spectrum of antimicrobial properties of commercial wines from different Vitis vinifera L. varieties.

Fifteen commercial wines produced from international and autochthonic varieties of Vitis vinifera L. cultivation of different Balkan winegrowing subregions were studied for their antimicrobial activity against six Gram-positive (Clostridium perfringens, Bacillus subtilis, Staphylococcus aureus, Listeria inocua, Sarcina lutea and Micrococcus flavus) and six Gram-negative (Escherichia coli, Pseudomonas aeruginosa, Salmonella enteritidis, Shigella sonnei, Klebsiella pneumonia and Proteus vulgaris) bacteria. The concentrations and types of phenolic compounds responsible for antibacterial activity in wines were investigated by HPLC and spectroscopic methods. The correlation between amounts of phenolics and antibacterial activities of investigated wines were studied by application of statistical (PCA, factor and cluster) analyses. This study gives the possibility to predict the biological quality of the wine from the same cluster towards bacteria without "wet" analysis. Obtained results can to be useful both to wine producers for the formation of market price of wine, and to wine consumers in choosing quality red wine with high content of polyphenols.