Table 1.

Average ± SD isotopic 13C enrichments (%)

C2 C3 C4
Glu 19.2 ± 3.6*,** 15.9 ± 2.8** 25.8 ± 4.5**
Gln 14.9 ± 3.0* 12.0 ± 2.2 21.0 ± 4.0
Asp 23.5 ± 7.6 23.4 ± 7.8
  • Values are averages of 40 and 60 min data (n = 7 rat brains).

    *p < 0.001 between C2 and C3 (paired two-tailed t test); **p < 0.02 between Glu and Gln.