METHOD FOR MEASURING DEGREE OF DEACETYLATION OF CHITOSAN OLIGOSACCHARIDE BY USING FIRST-ORDER DERIVATIVE ULTRAVIOLET SPECTROPHOTOMETRY

摘要

A method for measuring the degree of deacetylation of a chitosan oligosaccharide by using first-order derivative ultraviolet spectrophotometry, comprising the steps of 1) with a hydrochloric acid solution having a concentration of 0.3-1.0 mol/L as a blank solvent, preparing standard solutions of N-acetyl-D-glucosamine at a series of concentrations, measuring the ultraviolet absorbance values A of the standard solutions of N-acetyl-D-glucosamine within a wavelength range of 200-206 nm, and plotting a standard curve according to the concentrations of N-acetyl-D-glucosamine and ΔA/Δλ; and 2) dissolving a chitosan oligosaccharide sample with the blank solvent, with the blank solvent as a reference, measuring the absorbance value of the chitosan oligosaccharide sample at a wavelength of 200-206 nm, and calculating the degree of deacetylation of the chitosan oligosaccharide sample according to the standard curve.