Degradation of polymeric phenolic structures at 24 and 40 h of culture time by activities of the Kefir cultures acting on the soymilk substrate could explain increase in soluble phenolic content and decreased antioxidant activity at those time points
Similarly, the decreases in soluble phenolic contentobserved at 48 h of culture time concomitant to a slightincrease in antioxidant activity could be from formation of polymeric phenolic structures. However, since the decrease in phenolic content could also result from degradation of phenolic structures as possible yeast and bacterial antimicrobial detoxification strategies, investigation of further related activities, such as enzymes involved, would be helpful.