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Table 5 Identification of markers in the HPLC fingerprint of the formula by LC-MS analysis

From: Quality assurance for Chinese herbal formulae: standardization of IBS-20, a 20-herb preparation

    APCI MS Data (Positive Ion)   
Peak Identification Time (min) M/QMIPa Other Peaks MS2 of M/QMIP Plant Sourceb Content in formulation (mg/kg)
1 Esculin 6.4 341 (M+H)+ 179 179 FR  
2 Chlorogenic acid 10.3 355 (M+H)+ 163 163 AS  
3 Aesculetin 12.0 179 (M+H)+   134, 123, 109 FR 310
4 Paeoniflorin 18.8 498 (M+H2O)+ 301, 179 301, 179 PL  
5 prim-O-Glucosylcimifugin 23.8 469 (M+H)+   307 SD  
6 Magnoflorine 32.2 342 (M)+   297, 265 CC, PA  
7 Liquiritin 35.9 419 (M+H)+ 307, 257   GU  
8 5-O-Methylvisamminoside 49.9 453 (M+H)+ 291 290 SD  
9 Hesperidin 52.0 610 (M)+ 465, 449, 303 463 CR 1460
10 Columbamine 60.2 338 (M)+   323, 294 CC  
11 Jatrorrhizine 61.3 338 (M)+   323, 294 CC  
12 Epiberberine 61.3 336 (M)+    CC  
13 Coptisine 61.4 320 (M)+   304, 292 CC  
14 Palmatine 66.5 352 (M)+   337, 308 CC, PA 420
15 Berberine 67.3 336 (M)+   321, 292 CC, PA 1620
16 Glycyrrhizic acid 76.2 823 (M+H)+ 647, 471, 453, 406   GU 780
17 Schisandrin 81.8 433 (M+H)+ 415   SC 140
18 Honokiol 93.3 266 (M)+ 263   MO 63
19 Magnolol 98.6 266 (M)+ 261   MO 93
20 Schisandrin A 107.7 417 (M+H)+   402, 347, 316 SC  
  1. Note: Peak number refers to the chromatographic fingerprint of the clinical preparation (Figure 4). Peaks 6, 10, 12, and13 were identified by LC-MS/MS2 analysis based on the literature values [17, 18] and other peaks were identified by comparison of authentic chemicals. Jatrorrhizine and epiberberine (peaks 11, 12) were co-eluted with the same retention times.
  2. a Molecular or quasi-molecular ion peak; b FR: Fraxinus rhynchophylla; AS: Artemisia scoparia; PL: Paeonia lactiflora; SD: Saposhinikovia divaricata; GU: Glycyrrhiza uralensis; CR: Citrus reticulata; CC: Coptis chinensis; PA: Phellodendron amurense; SC: Schisandra chinensis; MO: Magnolia officinalis.