It was found that the inhibition rate of cow/soymilk kefirs to inhibit ascorbate autoxidationranged from 8.34–17.00% depending on soymilkratio. As shown in Table 2, kefirs produced from100% soymilk (0:100) had the highest inhibitionrates whereas the cow milk kefirs (100:0) had thelowest values. According to statistical analysisand Duncan test, a significant increase weredetermined in kefir samples reaching to 50% ofsoymilk (P<0.05). It is clear that the significantincrease in inhibition rates may be related to theaction of isoflavones and tocopherols, the mainphenols found in soy bean (Wang et al 2006).Similarly with milk source, inoculation type wasalso affected the inhibition rate of ascorbateautoxidation (P<0.05) because culture inoculatedkefirs consistently had higher values than graininoculated ones. This result can be explained byintensive effect of intracellular antioxidants ofmicroorganisms in kefir culture rather than inkefir grain. However fat content has not affectedthe inhibition rate of ascorbate autoxidation
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