Table 2.

MRM transitions and respective fragmentation parameters

Compound	Q1	Q3	DP [V]	EP [V]	CE [eV]	CXP [V]
citrate	190.8	111a/86.6	−50	−10	−18/−24	−11/−7
13C2-citrate	192.8	111.9a/86.9	−50	−10	−18/−24	−11/−7
isocitrate	191	172.7a/155.2	−50	−9	−14/−18	−9/−9
α-ketoglutarate	145	100.9/56.8a	−45	−10	−12/−16	−6/−8
13C4-α-ketoglutarate	149	105	−50	−11	−12	−7
2-hydroxy-glutarate	147	129a/101	−70	−10	−14/−20	−9/−9
succinate	116.9	73.1a/98.8	−40	−10	−16/−14	−5/−11
13C4-succinate	120.9	75.9	−40	−10	−16	−7
fumarate	114.8	71	−40	−10	−12	−9
13C4-fumarate	118.8	73.8	−40	−10	−12	−9

Abbreviations: CE, collision energy; CXP, cell exit potential; DP, declustering potential; EP, entrance potential; Q1, precursor ion mass; Q3, product ion masses.

^aFragments used as quantifier ions.