Study on separation of apple pectin by ultrafiltration membrane

Five ultrafiltration membranes in different molecular weight cut-off(MWCO)were applied to isolate apple pectin.The results indicated that the best parameters of ultrafiltration were in room temperature,pressure 0.08MPa and concentration 1g/L.Meanwhile,molecular weight of pectin was related to its physico-chemical properties.The larger was the molecular weight of pectin,the more were its galacturonic acid content and degree of esterification,and the smaller was transmittance.Ultrafiltration contributes to the decolouring of pectin extract.The experiment provides theoretical support for industrial manufacturing of pectin in purification and separation.