Current knowledge states that the effect of phenolic compounds
on bacterial growth depends on the microbial strain, polyphenols
structure, and dosage assayed (Almajano et al., 2008; Campos et al.,
2003). Gram-negative bacteria are more resistant to polyphenols than
Gram-positive microorganisms, probably due to the differences
observed in their cell wall composition (Puupponen-Pimiä et al.,
2005). Extensive research into interaction among phenolic compounds
and intestinal bacteria has been centered mainly on
antimicrobial properties against pathogenic bacteria