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

Table 3

Phenolic acids identified in three polyphenol-rich extracts from Chilean propolis by LC-MS.

Compound	CEP1	CEP2	CEP3	Retention time	MW	Main fragments
Caffeic acid	+	+	+	15.3	180	135, 105
CAPE	+	+	+	41.8	284	139, 135
Chlorogenic acid	N.D.	+	+	30.9	354	191, 161
P-coumaric acid	+	+	+	16.7	164	119, 104
Ferulic acid	+	+	+	34.5	194	178, 134
Gallic acid	+	N.D	N.D	8.5	170	125, 107

CEP1, CEP2, and CEP3: polyphenol-rich extracts from Chilean propolis collected in 2008, 2010, and 2011, respectively. CAPE: caffeic acid phenethyl ester; + indicates presence; N.D.: not detected.