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. 2019 Jul 31;9:11122. doi: 10.1038/s41598-019-46946-7

Table 1.

Tentative identification of phenolic compounds in E. supra-axillaris leaves by HPLC-ESI-MS/MS.

No. Rt [M-H]− MS/MS Proposed structure
1 1.93 169 125 Gallic acid*
2 2.06 331 169 Galloyl glucose
3 2.10 331 169 Galloyl glucose
4 2.4 353 191, 179 5-O-Caffeoylquinic acid
5 3.86 353 191, 179 3-O-Caffeoylquinic acid
6 4.21 353 191, 179 4-O-Caffeoylquinic acid
7 4.32 483 331, 169 2, 6 di-O-(α/β)-4C1- galloyl glucose*
8 4.57 337 191, 163 p-Coumaroylquinic acid
9 4.75 483 331, 169 2,3 di-O-(α/β)-4C1- galloyl glucose*
10 5.06 757 301, 613, 633 Galloyl decarboxy valoneoyl glucoside
11 9.94 183 183, 169 Methyl gallate
12 11.07 563 417, 285 Kaempferol pentosyl rhamnoside
13 15.87 385 223, 178 Sinapic acid hexoside
14 16.44 399 273, 179 Monolactonoside didecarboxylated valoneoic acid
15 17.97 275 275, 257, 229 3,4,8,9,10-pentahydroxy-6-oxobenzo[c]chromene
16 17.24 595 463 Myricetin-3-O-xylopyranosyl(1 → 2)-α-1C4-rhamnopyranoside*
17 21.89 479 317 Myricetin hexoside I
18 22.84 367 191, 179 Feruloylquinic acid
19 23.03 479 317 Myricetin hexoside II
20 23.56 449 317 Myricetin pentoside I
21 24.54 449 317 Myricetin pentoside II
22 24.81 497 169, 183, 313, 341 Gallic acid methyl ester (-O-galloyl) hexoside
23 26.42 463 317 Myricetin 3-O-α-1C4-rhamnopyranoside*
24 27.71 463 317 Myricetin rhamnoside I
25 28.8 463 317 Myricetin rhamnoside II
26 31.80 491 359 Tri-O-methyl myricetin pentoside
27 32.78 447 301 Quercetin deoxyhexoside
28 38.33 431 285 Kaempferol deoxyhexoside
29 40.33 615 179, 301, 463 Myricetin galloyl-rhamnoside I
30 43.13 615 179, 301, 463 Myricetin galloyl-rhamnoside II
31 49.2 593 447, 285 Kaempferol coumaroyl-hexoside
32 51.98 657 495, 329 Caffeoyl digalloyl quinic acid

*Compounds isolated and identified during this study.