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Table 1 Characterization of chemical constituents of the processed HSW samples

From: Integrated chemometric fingerprints of antioxidant activities and HPLC–DAD–CL for assessing the quality of the processed roots of Polygonum multiflorum Thunb. (Heshouwu)

Peaks TR (min) Formula MS (m/z) MSn (m/z) Identification λmax (nm)
1 8.20 C7H6O5 168.8[M-H] 124.8 [M-H-CO2], Gallic acid 270
2 13.262 Unknown 323.1 [M-H] Unknown 285
3 14.134 C7H6O4 152.8 [M-H] 108.8 [M-H-CO2] Protocatechuic acid 260, 293
4 18.582 Unknown 185.8 [M-H] 141.8 [M-H-CO2] Unknown 218, 279
5 21.664 C15H14O6 289.0 [M-H] 244.8 [M-H-CO2] Catechin 278
6 26.645 C15H14O6 289.0 [M-H] 244.9 [M-H-CO2] Epicatechin 219, 282
7 29.50 C26H32O14 567.1 [M-H] 613.2 [M-H + HCOO], 405, 242.9 2, 3, 5, 4′-tetrahydroxystilbene-2-O-(6′′-O-α-d-glucopyranosyl)-β-D-glucopyranosyl) 320
8 30.28 C20H22O9 405.1 [M-H], 441 [M-H + Cl], 242.8[M-H-glu] Cis-2, 3, 5, 4′-tetrahydroxy-stilbene-2-O-β-d-glucoside 283
9 37.17 C20H22O9 405.1 [M-H], 441 [M-H + Cl], 242.8[M-H-glu] Trans-2, 3, 5, 4′-tetrahydroxy-stilbene-2-O-β-d-glucoside 213, 322
10 38.112 C22H18O10 441.1 [M-H] 288.9, 330.9 Unknown 273
11 38.538 C27H26O13 557.2 [M-H] 312.9 2, 3, 5, 4′-tetrahydroxy-stilbene-2-O-β-d-(2″- galloyl)-glucoside 214, 293
12 49.58 C20H24O9 407.1 [M-H] 244.9 [M-H-glu] torachrysone-8-O-glucoside 324
13 50.74 C21H20O10 431.1 [M-H] 268.9 [M-H-glu] Emodin-8-O-β-d-glucoside 222, 282,422
14 55.64 C22H22O10 283 [M-H-glu] 444.9 [M-H], 239.9 [M-CH3-CO], 240.9 Physcion-8-O-β-d-glucoside 222, 271,422
15 69.80 Unknown 283 239.8 Unknown 224, 285,434
16 79.79 C15H10O5 268.9 [M-H] 224.8 [M-H-CO2] Emodin 287, 439
17 9.0 Unknown  
18 33.09 Unknown  
  1. Not detected by HPLC–ESI–MS