Objective To investigate the function of middle-methoxyl pectin-Ca2+ complex in(Graduate School,Chinese Academy of Science,Beijing 100039;1 Polymer Engineering Laboratory,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China) lowing postprandial serum glucose of normal and impaired glucose tolerance(IGT) rats.Method The experimental IGT rats models were made by injecting STZ into abdomen.Then normal and IGT rats were given test meal and their postprandial serum glucose were measured.Results The middle-methoxyl pectin-Ca2+ complex could significantly improve the glucose tolerance and weaken the peak value of postprandial serum glucose of normal and IGT rats(P