Grape pomace (GP) is known for its high polyphenols content. The physiological functions of polyphenols vary based on their chemical structures.  Current literatures show that the chemical compositions of polyphenols in the seeds and skin of the GP differ. Therefore, the objective of this study was to determine the antimicrobial activity of GP extract gainst different E. coli and Salmonella strains. Properly diluted E. coli and Salmonella cultures were mixed with different grape skin or seed polyphenols to the final concentration of 0, 50, 100, 150, 200, 250 and 300�g/ml. These samples were plated on a BHI agar plates, incubated for 24 hours at 37�C, and colonies were numerated. Results showed that grape seed polyphenol more effectively inhibited pathogen growth than skin polyphenol; high inhibitory activity was observed at lower polyphenol concentrations (50-100 �g/ml); certain strains of E. coli and Salmonella were more sensitive to grape seed extracts than others.

Evaluating the antibacterial activity of seed and skin polyphenols of muscadine Noble grape pomace

247th National Meeting (2014)

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