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Concentrations of active substances (means ± SD) found in both poplar-type propolis extracts: (1) caffeic acid, (2) p-coumaric acid, (3) trans-ferulic acid, (4) trans-cinnamic acid, (5) kaempferol, (6) apigenin, (7) pinocembrin, (8) chrysin, (9) CAPE, (10) galangin. Statistically significant differences are marked as * for p ≤ 0.05, ** for p ≤ 0.01, *** for p ≤ 0.001, and **** for p ≤ 0.0001. Unpaired t-test was used to test the differences between the two corresponding groups.
