Fractionation of linear dextrin by gradient alcohol dissolution

The object of this work was to establish a method of linear dextrin fractionated by alcohol gradient dissolution on basis of the solubility of linear dextrin in alcohol solution.The effects of ratios of linear dextrin to alcohol solution, p H and salt ( KCl) on linear dextrin fractionation were investigated using the average molecular-weight dispersity ( D_Ma) as an evaluation index.The results showed that the D_Ma of fractions was lowest when the ratio of linear dextrin to alcohol solution was 1 ∶ 100. It confirmed that the fractionation under this condition was best.Besides, this method of fractionation was applicable in the acidic, neutral, and alkaline environments. The dextrin fractionation at p H6.00 was optimal. However, the existence of salt was not favorable for the fractionation of dextrin.These results suggested that gradient alcohol dissolution, which was simple and lowcost, was an efficient method for fractionating linear dextrin into fractions with different molar masses of low DM.