TY - JOUR T1 - Separation and on-line concentration of saponins from Panax notoginseng by micellar electrokinetic chromatography. AU - Wang,Shufang, AU - Ye,Shu, AU - Cheng,Yiyu, Y1 - 2006/02/15/ PY - 2005/10/13/received PY - 2005/12/19/revised PY - 2006/01/09/accepted PY - 2006/2/14/pubmed PY - 2006/6/20/medline PY - 2006/2/14/entrez SP - 279 EP - 84 JF - Journal of chromatography. A JO - J Chromatogr A VL - 1109 IS - 2 N2 - A simple, reproducible and sensitive micellar electrokinetic chromatography (MEKC) method was developed for the separation and determination of 10 saponins from Panax notoginseng. Field-enhanced sample injection with reverse migrating micelles (FESI-RMM) was used for on-line concentration of the saponins. The effects of concentrations of sodium dodecyl sulfate (SDS) and organic modifier, the sample matrix, the injection time of water plug, the injection voltage and injection time of sample on the separation and stacking efficiency were investigated. The optimum buffer contained 10mM H3PO4, 140 mM SDS, 20% acetonitrile and 15% 2-propanol and the pH of buffer was 2.4. The sample solution was diluted with 15 mM SDS and injected for 15s with -8 kV after injection of 2s water plug. Under the optimum conditions, the analytes were well separated with very high plate number (8.0 x 10(5)-1.2 x 10(6) N/m); the limits of detection of the analytes were 1.7-6.3 microg/mL. The high sensitivity permitted the determination of two minor saponins Rh1 (1.01 mg/g) and Rg2 (0.62 mg/g) in P. notoginseng, which were not determined in the literature. SN - 0021-9673 UR - https://www.unboundmedicine.com/medline/citation/16469324/Separation_and_on_line_concentration_of_saponins_from_Panax_notoginseng_by_micellar_electrokinetic_chromatography_ DB - PRIME DP - Unbound Medicine ER -