LIU Xi-juan1, CUI Feng2, YANG Zhang-min1*, XIAO Xu-lin3
(1 College of Life Science, Shaanxi Normal University, Xi′an 710062, Shaanxi, China; 2 Xi′an Product Quality Supervision Inspection Institute, Xi′an 710065,Shaanxi, China; 3 College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)
Abstract:
The influence of microwave treatment on principal quality index of the apple juice is investigated under different conditions. The results show that with the increase of microwave power (245,350,560,875 W) and prolongation of treatment time (50,70,90,110 s), the total acidity of the apple juice rises from 014% to 016%, the soluble solid content grows steadily from 105 degree to 425 degree. On the contrary, the clarified degree of the apple juice is reduced markedly from 954% to 270% and the total amount of colony is declined from 31×105 to zero.
KeyWords:
microwave-treatment; apple juice; quality index