Table 1 Retention time (Rt), wavelengths of maximum absorption in the visible region (λmax), mass spectral data, and tentative identification of phenolic compounds in four selected A. gangeticus leafy vegetables
Peak no | Rt (min) | λmax (nm) | Molecular ion [M - H]− (m/z) | MS2 (m/z) | Identity of tentative compounds |
|---|---|---|---|---|---|
1 | 9.12 | 254 | 169.1354 | 169.1465 | 3,4,5 Trihydroxybenzoic acid |
2 | 30.61 | 254 | 167.1423 | 167.1634 | 4-Hydroxy-3-methoxy benzoic acid |
3 | 34.82 | 254 | 197.1125 | 197.1125 | 3,5-Dimethoxy-4-hydroxybenzoic acid |
4 | 31.52 | 254 | 137.0325 | 137.0425 | 4-Hydroxybenzoic acid |
5 | 48.23 | 254 | 137.2216 | 137.3241 | 2-Hydroxybenzoic acid |
6 | 52.51 | 254 | 301.0384 | 301.0586 | 2,3,7,8-Tetrahydroxy-chromeno [5,4,3-cde] chromene-5,10-dione |
7 | 2.24 | 280 | 154.1342 | 154.1452 | 3,4-Dihydroxybenzoic acid |
8 | 4.13 | 280 | 154.1354 | 154.1387 | 2,4-Dihydroxybenzoic acid |
9 | 3.71 | 280 | 154.1357 | 154.1456 | 2,5- Dihydroxybenzoic acid |
10 | 32.12 | 280 | 179.0792 | 179.0748 | 3,4-Dihydroxy-trans-cinnamate |
11 | 31.14 | 280 | 353.1352 | 353.1453 | 3-(3,4-Dihydroxy cinnamoyl) quinic acid |
12 | 42.16 | 280 | 163.0586 | 163.1105 | 4-Hydroxy cinnamic acid |
13 | 47.95 | 280 | 193.1843 | 193.1748 | 3-Methoxy-4-hydroxy cinnamic acid |
14 | 49.61 | 280 | 163.2621 | 163.2784 | 3-Hydroxy cinnamic acid |
15 | 49.14 | 280 | 223.1632 | 223.1752 | 4-Hydroxy-3,5-dimethoxy cinnamic acid |
16 | 67.32 | 280 | 147.1214 | 147.1143 | 3-Phenyl acrylic acid |
17 | 23.93 | 280 | 290.2368 | 290.2246 | (2R-3S)-2-(3,4-dihydroxyphenyl)-3,4-dihydro-2-chromene-3,5,7-triol |
18 | 26.73 | 280 | 271.0746 | 271.1527 | Naringenin |
19 | 54.35 | 360 | 463.2795 | 463.3345 | Quercetin-3-O-glucoside |
20 | 53.32 | 360 | 463.4428 | 463.5243 | Quercetin-3-O-galactoside |
21 | 53.34 | 360 | 609.3788 | 609.3687 | Quercetin-3-O-rutinoside |
22 | 7.56 | 370 | 301.0425 | 301.0348 | 2-(3,4-dihydroxy phenyl)-3,5,7-trihydroxychromene-4-one |
23 | 4.61 | 370 | 626.1954 | 626.2675 | Myricetin-3-O-rutinoside |
24 | 15.45 | 370 | 270.3426 | 270.3548 | 4′,5,7-Trihydroxyflavone, 5,7-Dihydroxy-2-(4-hydroxyphenyl)-4-benzopyrone |
25 | 17.82 | 370 | 593.5214 | 593.3264 | kaempferol-3-O-rutinoside |