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. 2018 Dec 12;9:1461. doi: 10.3389/fphar.2018.01461

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Copyright © 2018 Li, Jiang, Wang, Lv, Xie, Yang, Guo, Tang and Tang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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LC-MS/MS spectra of methyclothiazide, four marker compounds of Chuanxiong and warfarin. Methyclothiazide, warfarin, and ferulic acid can be ionized under negative ionization conditions, levistilide A, senkyunolide I, and tetramethylpyrazine ionized under positive ionization conditions. The most sensitive mass transitions for methyclothiazide [(A) the internal standard] were 357.81→321.89. for senkyunolide I (B) were 225.11→207.04, for ferulic acid (C) were 192.98→133.96, for tetramethylpyrazine (D) were 137.10→96.04, for levistilide A (E) were 381.09→190.92 and for warfarin (F), were m/z 307.03→250.02.