Table 4 Characteristics of 1H-NMR signals observed in Qinjiao extract
Compound | Group | Chemical shift δ (ppm) |
|---|---|---|
Gentiopicroside | 3-H(d) | 7.47 |
8-H(m) | 5.76 | |
1-H(d) | 5.66 | |
6-H(m) | 5.63 | |
10-CH2(dt) | 5.22 | |
7=CH(m) | 5.00–5.10 | |
1-glc-1′(d) –CH (anomeric) | 4.67 | |
Loganic acid | 3-H(d) | 7.38 |
1-H(d) | 5.28 | |
5-H(m) | 2.24 | |
9-H(m) | 1.98 | |
8-H(d) | 1.10 | |
1-glc-1′(d) –CH (anomeric) | 4.66 | |
Swertiamarin | 3-H(s) | 7.65 |
9-H(d) | 2.93 | |
Sweroside | 3-H(d) | 7.60 |
Sucrose | –CH (anomeric)(d) | 5.40 |