Avance 3 hd ascend 400 mhz spectrometer

The purity of the isolated pteryxin was determined by the isocratic condition with a mobile phase consisting of acetonitrile/H₂O (45:55) at a flow rate of 0.4 mL/min for 5 min by a quadrupole LC/MS/MS (Xevo TQD equipped with H-class and eλ PDA detector, Waters Corp., Milford, MA, USA) on a reversed phase chromatography column (ACQUITY UPLC BEH C18, 50 × 2.1 mm I.D., 1.7 µM particle size, Waters Corp.) at 40 °C.
The structure of pteryxin was confirmed as previous procedures using ¹H and ¹³C-NMR spectra (Avance III HD Ascend 400 MHz spectrometer, Bruker Billerica, MA, USA) [13 (link)].

The structure of pteryxin was determined by its ¹H and ¹³C-NMR spectra (Avance III HD Ascend 400 MHz spectrometer, Bruker Billerica, MA, USA), and its molecular formula was determined by Q-TOF LC/MS (Agilent 6530 Accurate-Mass Q-TOF LC/MS system Agilent Technologies, CA, USA) on a reversed-phase chromatographic column (ACQUITY UPLC BEH C18, 50 × 2.1 mm I.D., 1.7 μM particle size, Waters Corp., MA, USA) at 40 °C. The mobile phase consisting of a 0.1% formic acid aqueous solution / 0.1% formic acid containing acetonitrile (1:1) was carried out at the flow rate of 0.4 mL/min by a linear gradient to 0.1% formic acid aqueous solution/0.1% formic acid containing acetonitrile (1:19) at 3 min. The high-resolution mass spectra (HRMS) was measured under the following conditions: a positive ion mode; a desolvation temperature, 350 °C; a desolvation pressure, 40 psig; and a desolvation gas flow, 8 L/min.