Study on extraction and properties of pectin from the peel of orange

Using peel of orange as the material,pectin was extracted by acid extraction method.Through factor analysis method and orthogonal experimental,the optimal process conditions were shown as follows∶ ratio(solid∶liquid)1∶ 25(m∶ V),extracting solution pH1.7,extracting temperature 85℃,extracting time 100min,precipitated with ethanol in the ratio 1∶ 2 at pH3.5,and the resulting extraction yield was 21.816%.Analyzing the properties of the pectin,galactose-uronic acid,degree of methoxylation,moisture,ash content,and pH of solution were 70.66%,72.49%,9.71%,3.26%,and 2.93,respectively.All the parameters reached the Chinese standard.The method was suitable for the exaction of pecttion from the peel of orange.