The results of disc diffusion showed that gram positive bacteria are more sensitive than gram negative bacteria.
In general, gram negative bacteria are more resistant to polyphenols than gram positive bacteria, perhaps due to the different cell wall compositions (Negi et al., 2003).
Since the cell wall structure of the gram negative bacteria is built with lipopolysacharides that hinder the accumulation of the antimicrobial agents (Bezic et al., 2003).