Table 4.

Relative signal intensities of tandem mass isotopomers of the M0, M1, and M2 mass isotopomers of Mal for an equimolar mixture of isotopomers Mal₁₀₀₀, Mal₀₁₀₀, and Mal₀₀₁₀

M0a		M1				M2
m0b		m0		m1		m0		m1		m2
m/z foundc	Rel. int.d	m/z found	Rel. int.	m/z found	Rel. int.	m/z found	Rel. int.	m/z found	Rel. int.	m/z found	Rel. int.
41.0035	0.01	41.0034	0.36	42.0067	0.62	<LOD	–	42.0072	0.02	<LOD	–
43.0193	0.01	43.0192	0.33	44.0227	0.64	43.0192	0.00	44.0226	0.02	45.0262	0.00
44.9988	0.01	44.9984	0.63	46.0019	0.36	44.9987	0.00	46.0019	0.00	–	–
59.0146	0.03	59.0143	0.63	60.0178	0.30	59.0146	0.02	60.0180	0.02	61.0200	0.00
72.9941	0.01	72.9939	0.31	73.9973	0.65	72.9939	0.00	73.9972	0.02	75.0008	0.01
87.0099	0.01	87.0097	0.28	88.0129	0.68	–	–	88.0131	0.01	89.0167	0.01
89.0254	0.01	89.0254	0.01	90.0289	0.96	–	–	90.0288	0.01	91.0322	0.02
115.0049	0.01	–	–	116.0091	0.96	–	–	–	–	117.0119	0.03

^aM0, M1, and M2 denote the mass isotopomers of Mal which correspond to the quadrupole mass filters Q1 = 133, Q2 = 134, and Q3 = 135, respectively

^bm0, m1, and m2 denote the unlabeled, singly labeled and doubly labeled product ions, respectively

^cThe accurate masses are the measured accurate masses in this specific experiment

^dThe relative intensities were not corrected for natural isotopic abundance