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. 2022 Aug 4;27(15):4962. doi: 10.3390/molecules27154962

Figure 1.

Figure 1

ESI-MS/MS profile of rhizome Agropyron repens herbal tea, samples AR1, AR2, AR3, in negative ionization ESI- (a) and positive ionization ESI+ (b), with signals normalized to the highest one for a direct comparison among samples. (a) Pyr ac (pyruvic acid, [M-H]− = 87 m/z); Lac ac (lactic acid, [M-H]− = 89 m/z); Pho ac (phosphoric acid, [M-H]− = 97 m/z); Fur ac (2-furoic acid, [M-H]− = 111 m/z); Fum ac (fumaric acid, [M-H]− = 115 m/z); Mal ac (malic acid, [M-H]− = 133 m/z); cis-Aco ac (cis-aconitic acid, [M-H]− = 173 m/z); hex (hexose, [M-H]− = 179 m/z); Cit ac (citric acid, [M-H]− = 191 m/z); di-hex (di-hexose, [M-H]− = 341 m/z, [M+Cl]− = 377 m/z, [M+Cl+2]− = 379 m/z); di-hex-pen (di-hexose-pentose, [M-H]− = 473 m/z). (b) GABA (γ-aminobutyric acid, [M+H]+ = 104 m/z); Pro (proline, [M+H]+ = 116 m/z); Val (valine, [M+H]+ = 118 m/z); Asn (asparagine, [M+H]+ = 133 m/z); His (histidine, [M+H]+ = 156 m/z); Arg (arginine, [M+H]+ = 175 m/z); hex ([M+Na]+ = 203 m/z, [M+K]+ = 219 m/z); di-hex ([M+Na]+ = 365 m/z, [M+K]+ = 381 m/z); di-hex-pen ([M+H]+ = 475 m/z, [M+Na]+ = 497 m/z, [M+K]+ = 513 m/z).