Method development for the determination of coumarin compounds by capillary electrophoresis with indirect laser-induced fluorescence detection.
A capillary zone electrophoresis (CZE) with indirect laser-induced fluorescence detection (ILIFD) method is described for the simultaneous determination of esculin, esculetin, isofraxidin, genistein, naringin and sophoricoside. The baseline separation was achieved within 5 min with running buffer (pH 9.4) composed of 5mM borate, 20% methanol (v/v) as organic modifier, 10(-7)M fluorescein sodium as background fluorophore and 20 kV of applied voltage at 30 degrees C of cartridge temperature. Good linearity relationships (correlation coefficients >0.9900) between the second-order derivative peak-heights (RFU) and concentrations of the analytes (mol L(-1)) were obtained. The detection limits for all analytes in second-order derivative electrophoregrams were in the range of 3.8-15 microM. The RSD data of intra-day for migration times and second-order derivative peak-height were less than 0.95 and 5.02%, respectively. This developed method was applied to the analysis of the courmin compounds in herb plants with recoveries in the range of 94.7-102.1%. In this work, although the detection sensitivity was lower than that of direct LIF, yet the method would extend the application range of LIF detection.
Wang
Weiping
W
Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
Tang
Jianghong
J
Wang
Shumin
S
Zhou
Lei
L
Hu
Zhide
Z
D001578:Benzopyrans / Q000032:analysis / Q000737:chemistry; D003374:Coumarins / Q000032:analysis* / Q000737:chemistry; D019075:Electrophoresis, Capillary / Q000379:methods*; D004929:Esculin / Q000032:analysis / Q000737:chemistry; D044950:Flavanones / Q000032:analysis / Q000737:chemistry; D019833:Genistein / Q000032:analysis / Q000737:chemistry; D007834:Lasers; D015394:Molecular Structure; D015203:Reproducibility of Results; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014468:Umbelliferones / Q000032:analysis / Q000737:chemistry
D001578:Benzopyrans; D003374:Coumarins; D044950:Flavanones; D014468:Umbelliferones; C120642:sophoricoside; D004929:Esculin; C008182:isofraxidin; D019833:Genistein; C005274:naringin; C007628:esculetin