Evaluation of the antimicrobial potential of several natural extracts obtained from Albarino grape marc

The antimicrobial activity of polyphenolic-rich plant extracts has been largely proved. In recent years, this feature has been gaining attention due to the need of new sources of environmental friendly antimicrobials that can help reduce the use of antibiotics. In this study we tested several extracts from Albarino grape marc against a collection of pathogenic and commensal bacteria, which includes Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus hyicus, Bacillus subtilis, Enterococcus faecalis, Aeromonas salmonicida subsp. salmonicida, Aeromonas hydrophila, Proteus mirabilis, Streptococcus suis, Citrobacter freundii and Streptococcus uberis. The antimicrobial tests were performed according to the EUCAST recommendations, using the Alamar-Blue colorimetric/fluorometric method, and reading the plates by fluorometry. Although the results indicate that there is a wide range of susceptibility depending on both the nature of the extarct and the bacterial strain, in general these extracts present good antimicrobial activity against most of the studied species, and in most cases with values of IC₅₀ was below 2%.

 

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Publication History

Article published online:
16 November 2023