Antibiofilm Activity of Chilean Propolis on Streptococcus mutans Is Influenced by the Year of Collection

Table 1

Influence of propolis-collecting year on the content of phenolic compounds groups in polyphenol-rich extracts.

Group of compounds	CEP1	CEP2	CEP3	-value
Total polyphenols, mg mL^−1	24.6 ± 0.4^a	29.0 ± 0.8^b	24.7 ± 0.2^a	<0.0001
Flavones and flavonols, mg mL^−1	10.2 ± 0.03^a	11.9 ± 0.05^b	9.8 ± 0.1^c	<0.0001
Flavanones and dihydroflavonols, mg mL^−1	8.3 ± 0.3	9.4 ± 0.6	8.2 ± 1.3	0.228

CEP1, CEP2, and CEP3: polyphenol-rich extracts from Chilean propolis collected in 2008, 2010, and 2011, respectively. Results expressed as mean ± standard deviation. Total polyphenols, flavones, and flavonols and flavanones and dihydroflavonols are expressed as gallic acid, quercetin, and pinocembrin equivalent, respectively. value from ANOVA test. Different letters indicate significant differences after Tukey’s Multiple Comparisons posttest.