Research Article
Establishment of Quality Evaluation Method for Yinqiao Powder: A Herbal Formula against COVID-19 in China
Table 2
Mass spectrometry information of reference substances.
| Reference substance | tR (min) | Ion mode | Theoretical (m/z) | Measured (m/z) | Fragment ions (m/z) |
| Neochlorogenic acid | 5.80 | [M − H]− | 353.0867 | 353.0876 | 191.0554, 179.0341, 135.0439 | Chlorogenic acid | 6.93 | [M − H]− | 353.0867 | 353.0876 | 191.0554, 179.0341, 135.0439 | Caffeic acid | 7.34 | [M − H]− | 179.0339 | 179.0341 | 135.0439 | Liquiritin | 10.00 | [M − H]− | 417.1180 | 417.1196 | 255.0662, 135.0074, 119.0488 | Rutin | 10.02 | [M − H]− | 609.1450 | 609.1464 | 300.0279, 271.0250, 255.0299 | Cynaroside | 10.41 | [M − H]− | 447.0922 | 447.0936 | 285.0407 | Forsythoside A | 10.93 | [M − H]− | 623.1970 | 623.1980 | 461.1674, 161.0232 | Isochlorogenic acid A | 11.80 | [M − H]− | 515.1184 | 515.1195 | 353.0882, 191.0554, 179.0446, 135.0439 | Isochlorogenic acid C | 11.83 | [M − H]− | 515.1184 | 515.1195 | 353.0882, 191.0554, 179.0446, 135.0439 | Hesperidin | 11.54 | [M − H]− | 609.1814 | 609.1813 | 301.0721 | Phillyrin | 13.05 | [M + HCOO]− | 579.2072 | 579.2091 | 371.1507 | Arctiin | 13.34 | [M + HCOO]− | 579.2072 | 579.2091 | 371.1504 |
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