Table 1.

LC-MS characteristics of phenolic compounds in nipa palm vinegar.

Peak	Compounds	Retention time (min)	[M + H]+ (m/z)	Contents (µg/mL)
1	Gallic acid	5.60 ± 0.99	188.0	14.14 ± 0.07
2	Catechin	12.40 ± 0.08	185.0	8.61 ± 0.32
3	Tannic acid	12.82 ± 0.04	503.0	ND
4	Rutin	15.05 ± 0.17	649.0	6.67 ± 0.03
5	Isoquercetin	16.12 ± 0.21	329.0	11.27 ± 0.12
6	Hydroquinone	24.56 ± 0.20	289.0	ND
7	Eriodictyol	30.71 ± 0.55	327.0	ND
8	Quercetin	33.02 ± 0.36	341.0	10.33 ± 0.16
9	Apigenin	41.08 ± 0.40	271.0	ND
10	Kaempferol	42.37 ± 7.97	287.0	ND

ND: not detected; data are expressed as mean ± standard deviation in triplicate.