Gas chromatography of amino acids as n-thiocarbonyl ester derivatives
β Scribed by B. Halpern; Virginia A. Close; Annemarie Wegmann; J.W. Westley
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- French
- Weight
- 184 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
Protein hydrolysates are now routinely analysed by ion exchange chromatography (1) but a complete determination takes at least 3 hours. In addition, the automated amino acid analyzers now used are expensive and have limited application to other problems. Gas chromatography (g.1.c.) offers potential advantages in both speed and sensitivity at a greatly reduced instrumentation cost. However, despite many attempts (2), no entirely satisfactory g.1.c. procedure has been developed.
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Bile acids, such as cholic, chenodeoxycholic, deoxycholic, lithocholic and ursodeoxycholic acids, were allowed to react with hexafluoroisopropanol and trifiuoroacetic anhydride at 37" for 30 min. The resulting derivatives were gas chromatographed on QF-1, with flame ionization detection, and were id
Amino acids dissolved in aqueous methanol (or ethanol) and treated with optically active menthyl chloroformate were converted into N-menthyloxycarbonyl methyl (or ethyl) ester derivatives within a few minutes at room temperature. The obtained diastereomeric derivatives, with the exception of arginin