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

Table 2

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

Compound	CEP1	CEP2	CEP3	Retention time	MW	Main fragments
Apigenin	+	+	+	42.6	270	269, 254, 226, 167
Daidzein	+	N.D.	+	40.5	254	153, 129
Genistein	+	+	+	44.4	270	253, 215
Kaempferol	+	+	+	34.6	286	269, 241, 229, 183
Myricetin	+	+	+	30.0	318	301, 273, 169, 153
Pinocembrin	+	+	+	42.0	256	239, 215, 173, 153
Quercetin	+	+	+	32.5	302	285, 257
Rutine	+	N.D.	N.D.	35.9	309	300, 271

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