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Evaluation of the antioxidant profile and cytotoxic activity of red propolis extracts from different regions of northeastern Brazil obtained by conventional and ultrasound-assisted extraction

Fig 3

Concentration of formononetin (A) and kaempferol (B) in Brazilian red propolis extracts from different geographical sources obtained by conventional extraction (1) and ultrasound-assisted extraction (2) (mean ± standard error of mean).

A1, B1, C1, D1, E1 and F1—Extracts obtained by conventional extraction; A2, B2, C2, D2, E2 and F2—Extracts obtained by ultrasound-assisted extraction. Statistical analysis: Values showing the same letter in the same analysis do not show significant difference (p>0.05) through the Tukey test at a 95% confidence level.

Fig 3

doi: https://doi.org/10.1371/journal.pone.0219063.g003