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Table 1 Phenolic compounds identified in SBH by LC-MS/MS with ESI

From: Stingless bee honey protects against lipopolysaccharide induced-chronic subclinical systemic inflammation and oxidative stress by modulating Nrf2, NF-κB and p38 MAPK

Peak No RT (min) [M-H] (Frag. MS2 m/z) Molecular formula Compounds
1 0.92 169 (125) C7H6O5 Gallic acid
2 1.3 179 (135) C9H8O4 Caffeic acid
3 1.74 283.8 (241, 221, 179) C17H16O4 Caffeic acid phenethyl ester
4 2.09 197 (182, 147) C9H10O5 Syringic acid
5 2.75 289 (244.9, 175, 147) C15H14O6 Catechin
6 2.97 775 (715) NI Unknown
7 3.87 269 (251, 225, 205) C15H10O5 Apigenin
8 4.2 253 (209, 193, 178) C15H10O4 Chrysin
9 4.77 221 NA Unknown
10 5.3 147 (118, 129, 102) C9H8O2 Cinnamic acid
11 5.67 162 NI Unknown
12 6.5 165 (147, 119) C9H8O3 2-Hydroxycinnamic acid
13 7.6 285 (175, 151, 133) C15H10O6 Kaempferol
14 8.5 163 (119) C9H8O3 P coumaric acid
15 8.9 959 (913) NI Unknown
16 9.6 609 (301) C9H8O3 quercetin-3-O-rutinosid
17 10.2 614 (478, 452, 342) NI Unknown
18 12.4 137 (93) C7H6O3 4-Hydroxybenzoic acid
  1. NI, Not identified; RT, Retention time; [M-H], Molecular mass of honey extract on the loss of one proton measured by SIM