Study on 2-arylbenzo[ b ]furans from Itea omeiensis and their fragmentation patterns with Q-Orbitrap mass spectrometry.

One new 2-arylbenzo[]furan named iteafuranal F () as well as two known analogues () were isolated from the 95% EtOH extract of aerial parts of . Their chemical structures were constructed based on extensive analyses of UV, IR, 1D/2D NMR and HRMS spectra. Antioxidant assays revealed significant superoxide anion radical scavenging capacity of with IC value of 0.66 mg/mL, which was comparable to the efficiency of positive control of luteolin. In addition, the preliminary MS fragmentation patterns in negative ion mode were established to distinguish 2-arylbenzo[]furans with C-10 in different oxidation states: the characteristic loss of CO molecule [M-H-28] was observed for 3-formyl-2-arylbenzo[]furans, and the loss of CHO fragment [M-H-30] for 3-hydroxymethyl-2-arylbenzo[]furans, and the loss of CO fragment [M-H-44] for 2-arylbenzo[]furan-3-carboxylic acids.