Influence of Kefir fermentation on the bioactive substances of different breed goat milks

After fermentation with Kefir grains, the antioxidant activity of the Kefir samples increased. Kefir made from goat milk had higher content of microflora and total antioxidant activity. The total phenolic contents of the kefir samples made from different goat milk samples ranged between 726.08 and 1359.32 mg of gallic acid equivalents (GAE) L−1. The phenolic compounds in Kefir samples ranged between 0.77 and 4.21 mg 100 g−1 for gallic acid and 0.36-5.09 mg 100 g−1 for catechin. This study showed that goat kefir samples had significantly high bioactive substances.