Determination of 4-aminobutyric acid, aspartate, glutamate and glutamine and their 13C stable-isotopic enrichment in brain tissue by gas chromatography-mass spectrometry
โ Scribed by I.M. Kapetanovic; W.D. Yonekawa; H.J. Kupferberg
- Book ID
- 107996535
- Publisher
- Elsevier Science
- Year
- 1987
- Weight
- 701 KB
- Volume
- 414
- Category
- Article
- ISSN
- 0378-4347
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A method for the determination of 15N enrichment and concentration of allantoin and uric acid simultaneously in urine using gas chromatography/mass spectrometry (GC/MS) is described. The urine samples contained acid and its oxidation product allantoin. The uric acid and allantoin were isolated using
## Abstract A simple procedure for the extraction and derivatization of ฮฑโamino acids and ฮฑโketo acids from human plasma is described. This stable isotope dilution method permits the quantification of isotopic enrichment and concentrations of several ฮฑโketo and ฮฑโamino acids simultaneously. The der