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Microbial fermentative preparation of L-(/sup 15/N/sub 2/)lysine and its tracer: application to serum amino acid kinetic studies

Journal Article · · Anal. Biochem.; (United States)
OSTI ID:5723315
The microorganism Brevibacterium flavium 21129 has been used to produce multigram batches of L-(/sup 15/N/sub 2/)lysine of high purity and isotopic enrichment by supplementation of the growth medium with (/sup 15/NH/sub 4/)/sub 2/SO/sub 4/ of 98.0 atom% excess. The doubly /sup 15/N-labeled lysine can be detected at dilutions 10 times greater than singly labeled lysine when isotope dilution curves are analyzed by gas chromatography-mass spectrometry. This enhanced sensitivity permits kinetic measurements of plasma free-lysine isotope content over a 300-fold dilution during 6 h following a single oral bolus of 5 mg/kg body wt. This inexpensive preparation method lends itself to the production of highly useful biochemical compounds for kinetic studies of human nutrition.
Research Organization:
Baylor College of Medicine, Houston, TX
DOE Contract Number:
W-31109-ENG-38
OSTI ID:
5723315
Journal Information:
Anal. Biochem.; (United States), Journal Name: Anal. Biochem.; (United States) Vol. 131:1; ISSN ANBCA
Country of Publication:
United States
Language:
English