| Abstrakt: |
A procedure for simultaneous identification and quantification of canrenone and its biotransformed product 11-a-hydroxycanrenone by high-performance liquid chromatography with ultraviolet detector (HPLC-UVD) and mass spectrometry (LC-MS) methods was proposed. The optimal determination variables on the HPLC-UVD or LC-MS coupled with a ZORBAX Eclipse XDBC18 column (150mm × 4.6 mm, 5 μm) were set as follows: detection wavelength of 280 nm, mobile phase of water and methanol gradient elution, temperature for the chromatographic column of 30°C, flow rate of mobile phase of 0.8mL/min, sample injection volume of 5 μL, and elution time of 40 min. The MS conditions were set as follows: the flow rate of sheath gas, aux gas, and sweep gas were kept at 35 arb, 5 arb, and 0 arb, respectively. The temperature of capillary was held at 300°C, and capillary voltage was set at 30.00 V. Tube lens were performed at 100.00 V. The proposed method was validated by linearity (r² ≥ 0.9910), average recovery (94.93%, RSD1.21%), precision (RSD ≥ 1.31%), limit of detection, and limit of quantification (LOD 0.1∼0.12 mg/L, LOQ 0.5²0.67 mg/L), which proved to be affordable for simultaneously determining canrenone and its bio-transformed product 11-a-hydroxy-canrenone. [ABSTRACT FROM AUTHOR] |
