Table 1.

Characterization of phenolic compounds of PPE using LC-ESI/MS analysis

Component name	Expected mass (Da)	Observed m/z	Mass error (mDa)	Mass error (ppm)	Retention time (min)	Detector response	Adducts
(−) Epigallocatechin gallate	458.08	481.07	−0.91	−1.88	3.17	1,926.77	+Na, +H
3′,4′,5,7-Tetrahydroxyisoflavanone	288.06	289.07	0.73	2.51	3.60	1,129.09	+H
6″-O-Acetyldaidzin	458.12	459.12	−1.15	−2.49	7.02	1,507.41	+H
Cyanidin 3-O-xyloside	419.09	419.09	1.59	3.79	7.56	1,618.00	−e, +H
Dihydroquercetin 3-O-hexoside	466.11	489.10	0.72	1.48	4.43	3,258.50	+Na
Ellagic acid	302.00	303.01	0.37	1.23	5.69	119,562.75	+H, −e, +Na
Ellagic acid arabinoside	434.04	435.05	0.19	0.43	5.39	9,050.23	+H, +Na
Ellagic acid glucoside	464.05	465.06	1.43	3.08	4.27	4,554.70	+H, +Na
Epigallocatechin (−)	306.07	307.08	0.91	2.98	1.13	2,386.10	+H, +Na
Gallagic acid	604.01	604.00	−2.72	−4.50	4.17	1,057.14	−e
Gallic acid	170.02	171.02	0.23	1.37	0.96	2,218.83	+H
Isopeonidin 3-O-sambubioside	595.16	618.15	−3.60	−5.83	6.50	2,121.97	+Na, −H, −e
Kaempferol 3-(2G-rhamnosylrutinoside)	448.10	471.09	0.42	0.89	6.49	22,420.06	+Na, +H
Kaempferol 3-O-rhamnoside	432.10	433.11	0.44	1.00	6.48	2,342.33	+H, +Na
Leucopelargonidin	290.07	291.08	0.43	1.47	2.35	1,743.90	+H
Methylgalangin	286.04	287.05	0.50	1.74	6.49	15,837.07	+H
Punicalin	782.06	783.06	1.39	1.77	4.38	2,813.12	+H

Abbreviations: ESI, electrospray ionization; LC, Liquid chromatography; MS, mass spectrometer; PPE, pomegranate peel extract.