Effects of Chinese Propolis in Protecting Bovine Mammary Epithelial Cells against Mastitis Pathogens-Induced Cell Damage

Table 2

Major phenolic acids and flavonoids presented in Chinese propolis.

Peak number	Compounds	Retention time (min)	Contents (mg/g of extract)
1	Caffeic acid	11.1	4.1 0.3
2	p-Coumaric acid	16.5	1.8 0.7
3	Ferulic acid	19.0	1.2 0.3
4	Isoferulic acid	21.1	1.44 0.0
5	3,4-Dimethoxycinnamic acid	28.5	3.6 0.2
6	Cinnamic acid	31.0	1.4 0.0
7	Pinobanksin	36.2	9.0 0.5
8	Naringenin	38.2	0.4 0.0
9	Quercetin	40.1	1.0 0.2
10	Kaempferol	47.8	3.4 0.2
11	Apigenin	51.2	2.5 1.6
12	Pinocembrin	55.6	20.4 4.2
13	Chrysin	64.2	28.1 0.6
14	CAPE	65.2	6.7 1.0
15	Galangin	66.4	12.4 3.0

Values are the means SD ().