Objective:To establish an HPLC method for the determination of L-glutamine in glutamine capsules by HPLC.Method: The determination was performed on a Thermo BDS HYPERSIL C_(18)(250 mm×4.6 mm,5μm) column.The mobile phase was hexane sulfonate sodium solution(dissolving 0.8 g sodium hexane sulfonate in 1 000 ml water,adding 0.5 ml phosphoric acid and mixing) -methanol(9:1).The flow rate was 1.0 ml·min~(-1).The detection wavelength was 212 nm.Result:The calibration curve was linear within the range of 0.1 -1.0 ...