Table 2 Chemical markers in RPM samples from different geographical origins by UPLC-QTOF/MS
No. | t (min) | m/z (−) | Fragment information | Compound name | Compound type | Formula | Max fold change | VIP value |
|---|---|---|---|---|---|---|---|---|
C1 | 0.79 | 191.0197 | 191.0197, 173.0091 | Citric acid | Organic acids | C6H8O7 | 4.72 | 4.11 |
C2 | 2.86 | 881.1917 | 881.1917, 863.1829, 591.1144, 217.0506, 152.0015 | 3,3′-di-O-Galloyl-procyanidin B2 | Polyphenols | C44H34O20 | 8.12 | 5.12 |
C3 | 5.68 | 405.2810 | 405.2810, 243.1911, 227.0425, 215.0702, 201.0545, 173.0596 | 2,3,5,4′-Tetrahydroxystilbene-2-O-glucoside | Stilbene glycosides | C20H22O9 | 2.01 | 6.15 |
C4 | 8.06 | 431.0981 | 431.0981, 269.0455, 265.0506, 263.0350, 253.0506, 241.0506, 227.0350, 224.0478, 210.0322, 182.0373 | Emodin-8-O-glucoside | Anthraquinone glycosides | C21H20O10 | 31.99 | 5.20 |
C5 | 8.53 | 407.1347 | 407.1347, 245.0819, 230.0948, 202.0635, 159.0451 | Torachrysone-8-O-glucoside | Anthraquinone glycosides | C20H24O9 | 7.78 | 4.28 |
C6 | 8.65 | 473.1085 | 473.1085, 456.1062, 431.0983, 269.0455, 265.0506, 253.0506, 240.0428, 227.0350, 224.0478, 210.0322, 182.0373 | Emodin-O-(acetyl)-hexoside | Anthraquinone derivatives | C23H22O11 | 4.42 | 7.54 |
C7 | 9.30 | 487.0638 | 487.0638, 470.0734, 445.0369, 283.0604, 240.0428, 212.0478, 197.0244, 184.0505, 169.0278 | Physcion-O-(acetyl)-hexoside | Anthraquinone derivatives | C23H22O12 | 4.73 | 3.80 |
C8 | 10.18 | 285.0398 | 285.0398, 269.0455, 253.0506, 240.0428, 227.0350, 224.0478, 210.0322, 182.0373 | Citreorosein | Anthraquinones | C15H10O6 | 34.91 | 4.25 |
C9 | 12.50 | 283.0604 | 283.0604, 240.0428, 212.0478, 197.0244, 184.0505, 169.0278 | Physcion | Anthraquinones | C16H12O5 | 2567.78 | 6.46 |