Study on the yogurt with purple sweet potato

Formula and fermentation technology of yogurt with purple sweet potato was studied. The optimal formula and fermentation technology which were ascertained by orthogonal experiments that was as follows:purple sweet syrup 6%, white sugar 7%, compound stabilizing agent with 0.1% CMC and 0.1% sodium alginate, inoculum 4%, fermentation temperature 41℃, fermentation time 5h.The test was not only enriching the varieties of yogurt, but also improving the nutritional value of yogurt.