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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