|Determination of Astragaloside by HPLC-ELSD
a. Nanopure water b. Acetonitrile (HPLC)
HPLC (Shimadzu) Analytical balance (1/10000) Ultrasonic cleaner
0.45μm PTFE filter 10ml volumetric flask Screw cap vials
3) HPLC condition
Column: Shimpack-VP-ODS C18 5μm , 4.6×150mm
Mobile Phase: A:Water B: Acetonitrile
Flow Rate: 1.0 ml/min
Drift tube temperature :100℃
Accurately weigh30mg extraction into 50ml volumetric flask. Add Methanol to volume and sonicate to mix, filter through a 0.45μm PTFE filter into a screw cap vial and proceed with the analysis.
Standard preparation /calibration
Prepare a standard solution (approximately 0.2mg/ml in acetone) using a commercial reference standard of Astragaloside，Sonicate for about 10 minutes and transfer to screw-cap vials and can be stored in the refrigeration.
Determine the peak area’s logarithm of Astragaloside the on the sample chromatogram and compare to the corresponding peaks in the chromatogram for the sample solution.