Table 1. Mass isotopomer distribution of the TCA cycle intermediates.

Metabolite	M+0 (SD)	M+1 (SD)	M+2 (SD)	M+3 (SD)	M+4 (SD)
Citrate	33% ±1.53	17% ±1.56	24% ±1.45	18% ±1.1	8% ±1.13
2-Oxoglutarate	47% ±0.15	12% ±0.34	25% ±1.23	11% ±0.22	6% ±1.99
Succinyl-CoA	50% ±2.08	14% ±1.68	19% ±3.08	12% ±2.73	5% ±1.69
Succinate	50% ±0.09	15% ±0.14	10% ±1.21	21% ±0.22	4% ±1.09
Fumarate	47% ±0.15	20% ±0.48	16% ±0.18	17% ±0.74
Malate	45% ±0.05	21% ±0.43	15% ±0.02	17% ±0.33

For GC/MS data n = 3, for HPLC/MS data (Succinyl-CoA) n = 4. Not determined mass isotopologue fractions are not displayed. SD = relative standard deviation.