Few analytical methods have been reported for the verification of steroidal hormone drugs, especially for those with similar buy JQ1 chemical properties. In this paper, our aim was to develop a set of simple High-performance liquid chromatographic (HPLC) with evaporative light scattering detection12, 13, 14 and 15 (ELSD) and with dual
ESI ionization mass spectrometry (LCMS) methods are presented to distinguish and qualitatively analyze used to identify of Dexamethasone, Testosterone and Estrone (E1) in the combination form. Pure standards of Dexamethasone, Testosterone and Estrone (E1) were obtained from the Sigma–Aldrich, India. Organic solvents for chromatography were purchased in LCMS grade, ACS grade Acetonitrile was purchased from Honeywell-Burdick & Jackson (USA), water was obtained from ultra-purified from Elix Advantage 5 system equipped with Milli-Q Biocel (Millipore), all the chemicals used were of analytical reagent grade, and the solvents were of ACS. The purity of each reference standard was determined by HPLC PDA, ELSD detectors and dual ESI (LCMS). All solvents and samples were filtered through MILLEX FG (Millipore),
13 mm, 0.2 μM, fluoropore, non-sterile membrane sample filter paper before injecting into system. The analyses were performed using an Agilent 1200 Series HPLC system, equipped with a binary pump, an auto-sampler, a column oven, PDA detector and selleckchem a mass hunter software version B.02.01 (B2116.20) Dipeptidyl peptidase (Agilent Technologies, USA). Agilent 1260 Infinity Evaporative Light Scattering Detector (ELSD) instrument, operated by the Agilent 35900E multichannel interface which converts analog signal to digital (A/D) (Agilent Technologies, USA), was connected to the liquid chromatography for detection of steroids. The separation was carried out on a reverse phase Shodex C18, 3 μm, 4.6 × 100 mm at ambient temperature. The isocratic elution mode with a mobile phases
Acetonitrile and 0.1% formic acid in water and eluted by the following program at the flow 1 mL/min, runtime 6 min. The drift tube temperature for ELSD was set at 50 °C and the nitrogen flow rate was 53 psi. Agilent 6520 Quadrupole time-of-flight (Q-TOF) mass spectrometer. Coupled to an Agilent 1200 series HPLC system (Agilent Technologies, USA) is equipped with binary pump, auto sampler, thermostatted column compartment, variable wavelength detector, auto sampler thermostatted (G 1330B). The Agilent Q-TOF (6520) mass spectrometer is equipped with dual electrospray ionization (ESI) ion source, and the HPLC conditions were identical to those used for HPLC–ELSD analyses mentioned above. Mass spectra were acquired in positive mode with scan range from m/z 100 to 500 Da. The conditions of dual ESI source were as followed: drying gas (N2) flow rate, 30.