[High performance liquid chromatographic analysis of monosaccharide composition in lacquer polysaccharide from sap of lac tree].

This paper reports the separation and determination of monosaccharide composition in lacquer polysaccharide (LPS) by HPLC. The five monosaccharides were analyzed on microBondapak NH2 column (300 mm x 7.8 mm i.d. 10 microns) and refractive index detection. The mobile phase was CH3CN-H2O-CH3OH (70:25:5, V/V) flowing at a rate of 1.6 mL/min. These monosaccharides were identified by their retention times and quantitatively determined by their peak areas. LPS samples were hydrolysed with 2.0 mol/L CF3COOH. The linear correlation coefficients were all over 0.9953. The average recoveries of monosaccharides ranged 98.8%-103.6% and relative standard deviations were below 5%. The method is simple, rapid, precise, and has been used satisfactorilly for analysis of the monosaccharides hydrolyzed from LPS, which were isolated from sap of three kinds of Lac tree (Maoba Damu, Maoba Xiaomu and Jianshi) in Hubei province.