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Table 1 Comparisons of ten phenolic compounds identified from EEP samples using UPLC and UPLC/FT-ICR MS

From: UPLC/FT-ICR MS-based high-resolution platform for determining the geographical origins of raw propolis samples

No. Compound RT (min) MW UPLCa UPLC/FT-ICR MSb
Brazil China Korea K/B K/C Brazil China Korea K/B K/C
1 Cinnamic acid 9.8 148.05 N.D 1.7 0.2 N/A 0.1 N.D N.D N.D N/A N/A
2 Coumaric acid 4.8 164.05 25 0.8 1.5 0.1 1.9 O O O Unique Unique
3 Caffeic acid 3.5 180.04 7 N.D 4.5 0.6 N/A O O O Unique Unique
4 Chrysin 14.5 254.06 1.2 16.7 14.1 11.8 0.8 O O O Unique 0.8
5 Pinocembrin 14.9 256.07 10.4 8.3 6.4 0.6 0.8 O O O 1.1 1.1
6 CAPE 15.6 284.10 5.3 3.2 13.9 2.6 4.3 O O O 7.8 4.3
7 Kaempferol 11.0 286.05 2.3 1 0.4 0.2 0.4 O O O -0.4 1.1
8 Artepillin C 17.7 300.17 104.5 16.8 N.D N/A N/A O O O 1.8 2.2
9 Quercetin 9.5 302.04 1.9 0.6 0.3 0.2 0.5 O O O 0.3 2.0
10 Rutin 5.6 610.15 N.D N.D N.D N/A N/A N.D N.D N.D 2.2 0.6
  1. N.D not detected, N/A not applicable
  2. aThe values were the concentration of each component (╬╝moL/mL of EEP extract exhibiting 1% of the total flavonoid quantity) estimated using UPLC
  3. bThe values were the log2-transformed intensities of each component observed using FT-ICR MS