Table 4.

Isotopomer distribution of glutamate in RBCs incubated with [¹³C_1,2,3,4] α-ketoglutarate, alanine, and glucose

Time (h)	Percent Mass isotopomer distribution (glutamate)a
	Monoisotopic	M + 1	M + 2	M + 3	M + 4
0	95.3 ± 1.7	4.66 ± 1.66	0	0	0
6	15.9 ± 0.7**	0.72 ± 0.08**	0.10 ± 0.10	2.52 ± 0.37*	80.8 ± 0.3**
12	10.4 ± 0.7**	0.41 ± 0.01**	0	3.08 ± 0.55*	86.1 ± 0.9**
21.25	7.47 ± 0.24**	0.24 ± 0.01**	0	2.82 ± 0.14*	89.4 ± 0.3**
Expected distribution due to natural abundance	93.40	5.64	0.91	0.05	0.00

^aMeans and S.E.M. for n = 3

* p < 0.05; ** p < 0.001