Main content area

Development of an LC-MS/MS method for aromatase inhibitor screening

Park, Myeong Hyeon, Kim, In Sook, Dong, Mi-Sook, Yoo, Hye Hyun
Analytical and bioanalytical chemistry 2014 v.406 no.14 pp. 3443-3449
NADP (coenzyme), Simaroubaceae, acetonitrile, androstenedione, aromatase, cortisone, estrone, ethyl acetate, formic acid, humans, ionization, liquid chromatography, liquid-liquid extraction, monitoring, plant extracts, screening, spectrometers, tandem mass spectrometry
Aromatase (CYP 19A1) is a key steroidogenic enzyme that catalyzes the conversion of androgen to estrogen. In this study, a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for aromatase inhibitor screening was developed and validated. The substrate androstenedione was incubated with human CYP 19A1 supersomes in the presence of NADPH for 30 min, and estrone formation was determined by LC-MS/MS analysis. Cortisone was used as internal standard. The incubation mixture was extracted using a liquid-liquid extraction method with ethyl acetate. Chromatographic separation was achieved using a C₁₈column (3.0 × 50 mm, 2.7 μm) with a mobile phase consisting of 0.1 % formic acid/acetonitrile adopting gradient elution at a flow rate of 0.4 mL/min. The mass spectrometer was operated in positive electrospray ionization mode. The precursor-product ion pairs used for multiple reaction monitoring were m/z 287→97 (androstenedione), m/z 271 → 159 (estrone), and m/z 361 → 163 (IS, cortisone). The developed method met the required criteria for the validation of bioanalytical methods. The validated method was successfully applied to evaluate aromatase inhibitory activity of plants extracts of Simaroubaceae.