Kahana Z E, Lapidot A
Anal Biochem. 1983 Jul 1;132(1):160-4. doi: 10.1016/0003-2697(83)90441-4.
L-[15N]Glutamic acid was prepared in high yields via a fermentative process. Brevibacterium lactofermentum, growing on a medium containing 97% enriched 15NH4Cl as a sole isotopic precursor, excreted mostly L-[15N]glutamic acid. The L-[15N]glutamic acid was purified and identified. Gas chromatography-mass spectrometry analysis was performed to demonstrate its usefulness in clinical studies.