Improved determination of D-glucosamine hydrochloride in health foods by HPLC using 7-fluoro-4-nitrobenzo-2-oxa-l,3-diazole as a derivative.

Guanmin Su, Xifeng Wang, Defeng Chi, Lin Li, Lihua Shao

Index: J. Food Sci. 76(9) , N74-8, (2011)

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Abstract

This article presents an improved method to detect D-glucosamine hydrochloride in health foods. A simple precolumn derivatization procedure with 7-flouro-4-nitrobenzo-2-oxa-1,3-diazole (NBD-F) reagent was employed. The separation of the derivatized D-glucosamine hydrochloride (NBD-D-glucosamine hydrochloride) was performed using a mobile phase consisting of acetonitrile, potassium dihydrogen phosphate (0.01 mol/L), and trifluoroacetic acid (350:649.74:0.26, volume ratio) at a flow rate of 1.0 mL/min with the column temperature 35 °C. Under the optimum chromatographic conditions, the peak area of NBD-D-glucosamine hydrochloride compared with its absolute value of the peak area of NBD-D-glucosamine hydrochloride in a standard solution concentration range from 1.0 to 500.0 mg/L showed a good linear calibration (R = 0.9999). Recoveries, at spiked concentrations of 10.0, 40.0, and 500.0 mg/L, varied between 97.2% and 102.6% with relative standard deviations ranging from 0.4% to 1.5%. The present method provides sufficient sensitivity as reflected by the values of limit of detection (LOD) and limit of quantification (LOQ). LOD was determined from the signal-to-noise ratios (S/N) of NBD-D-glucosamine hydrochloride peak of at least 3 in the recovery test at 0.02 mg/L, and the estimated LOQ was 0.06 mg/L (S/N = 10). The proposed method was successfully applicable to detect D-glucosamine hydrochloride in health foods and drugs containing a variety of complex materials.© 2011 Institute of Food Technologists®