Objective:To establish the method for determination of the uronic acids in Polysaccharides isolated from Panax ginseng.Method: Mix the D-glucose and D-galacturonic in different proportions

and then use Carbazole method and Meta-hydroxyldiphenyl method to determine the D-galacturonic in the mixed sugar.Compare the interference of D-glucose on the determination results of D-galacturonic in this two methods.Choose the method of small disturbance as the determination method of the uronic acid in Panax ginseng Polysaccharides.Result: Using Meta-hydroxyldiphenyl method to determine the aldonic acid in Panax ginseng Polysaccharides and the average content is 29.34%.The optimized parameters were obtained as follows: the dosage of Na2B4O7-H2SO4 and m-hydroxydiphenyl was 6.0 mL and 100 μL

time for heating and color development were 12 min and 40 min respectively.The detection wavelength was 525 nm.Conclusion: Experimental results show that the method is easy and accurate

so it can be used for quality control of polysaccharides in Panax ginseng and its preparations.