The result presented in table 3 was expressed as % scavenging, while the highest % scavenging was found to be 64 % for Kefir produced from 0 hrs fermented brown rice milk and cow milk. On the other hand, kefir produced from 72 hrs fermented black rice milk showed the lowest % scavenging of 23.40 %. So, when the fermentation time was increased, the scavenging % decreased. According to our study the increased scavenging activity may be due to the milk protein or plant protein.
In addition, Liu and team (2005) proved that some antioxidant components were transferred from kefir grains to milk and soy-milk during fermentation. Besides this, Je Ruei Liu and group (2005) found that milks fermented by kefir grains demonstrated an enhanced activity as regards scavenging the DPPH radical as compared to unfermented milks, stating that kefir has got an influence on scavenging the DPPH radicals.