. 2009 Sep 30;30(1):211–221. doi: 10.1038/jcbfm.2009.197

Table 2. ¹³C fractional enrichment of glutamate (from [1-¹³C]glucose infusion) and glutamine (from [2-¹³C]acetate infusion) in positions C4 and C3 for ‘Young' and ‘Elderly' subjects at the end of a 2-h infusion.

(Mean±s.d.)	Glu-C4	Glu-C3	Gln-C4	Gln-C3
Young (n=8)	18.3±1.2	13.6±0.8	14.9±2.4	6.8±1.0
Elderly (n=7)	17.3±1.1	12.7±0.9	15.0±3.2	7.8±1.5

Fractional enrichment values are given in %, (means±s.d., n=7 for ‘Elderly' subjects; n=8 for ‘Young' subjects). The natural abundance (1.1%) was subtracted.

Table 2. 13C fractional enrichment of glutamate (from [1-13C]glucose infusion) and glutamine (from [2-13C]acetate infusion) in positions C4 and C3 for ‘Young' and ‘Elderly' subjects at the end of a 2-h infusion.

Table 2. ¹³C fractional enrichment of glutamate (from [1-¹³C]glucose infusion) and glutamine (from [2-¹³C]acetate infusion) in positions C4 and C3 for ‘Young' and ‘Elderly' subjects at the end of a 2-h infusion.