Table 3. Parameters for the analysis of organic acids in the lemons using UPLC-MS/MS MRM

Compound	RT1) (min)	Formula	Molecular weight	MRM transition2) ([M-H]−, m/z)		Dwell time (s)
				Precursor ion	Product ion
Citric acid	1.50	C6H8O7	192.12	191	111	0.047
Malic acid	1.07	C4H6O5	134.09	133	71	0.047
Succinic acid	1.95	C4H6O4	118.09	117	73	0.047
Tartaric acid	0.95	C4H6O6	150.09	149	73	0.047
Oxalic acid	0.87	C2H2O4	90.03	89	43	0.047
Fumaric acid	1.83	C4H4O4	116.07	115	71	0.047

Retention time.
Multiple reaction monitoring mode.