Rapid analysis of momordicoside A in bitter melon by high performance liquid chromatography following solid phase extraction.
A rapid, simple and accurate method for the determination of momordicoside A has been established using solid phase extraction (SPE) followed by high performance liquid chromatography (HPLC). Sample was processed by SPE on a Carb cartridge (3 mL/250 mg), and was then determined by HPLC on a C18 column (4.6 mm i.d. x 250 mm, 5 microns) with V(acetonitrile):V(methanol):V(50 mmol/L potassium dihydrogen phosphate buffer) = 25:20:60 as mobile phase (0.8 mL/min) and UV detection at 208 nm. The calibration curves were linear from 10 mg/L to 1,000 mg/L (r2 = 0.9992). The analytical method was shown to be highly reproducible, giving all of the relative standard deviations and relative mean errors less than 10% for both intra-day and inter-day determinations. The absolute recoveries were greater than 90%.