Influence of trifluoroacetic anhydride concentration during derivatization and chromatography of N(O,S)-trifluoroacetyl amino acid n-propyl esters

Stable isotope ratio analysis of amino a

Stable isotope ratio analysis of amino acids: the use of N(O,S)-ethoxycarbonyl trifluoroethyl ester derivatives and gas chromatography/mass spectrometry

✍ Jens Pietzsch; Ulrich Julius; Markolf Hanefeld 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 91 KB 👁 2 views

N(O,S)-Ethoxycarbonyl trifluoroethyl amino acid esters are formed by the reaction of amino acids with ethylchloroformate plus trifluoroethanol plus pyridine. The use of these derivatives for a rapid and sensitive determination of specific enrichment of stable isotopically labeled tracer amino acids