New simple method to detect uronic acids in polysaccharides / 中草药

ABSTRACT

Object To develop a simple and reliable method to detect the presence of uronic acids in polysaccharides Methods Uronic acid containing polysaccharides and standard glucons were subjected to acid hydrosis for 2 h and 4 h respectively. Samples of the products, before and after hydrolysis were analyzed by TLC using standard uronic acid as the control and aminobenzen alizaric acid as the chromogenic agent, to compare the sensitivities in the detection of uronic acid used in the present conventional analysis. Results The fluorescent spots used as criterion in traditional TLC method were not shown by uronic acids, but by CF 3COOCH 3 and other by products in reaction 0 5 ?g of uronic acid could be detected with our method, without false positive reaction Conclusion The traditional TLC method seemed to lack theorectical background and may mislead structural study The present method in more reliable to detect uronic acids in polysaccharides by analyzing the complete hydrolytic products of polysaccharides using TLC with standard uronic acids as control and aminobenzene alizaric acid as chromogenic agent