Analysis of less-volatile products of poly-L-valine pyrolysis by gas chromatography/Fourier transform infrared spectroscopy/mass spectrometry

Citation
Va. Basiuk et J. Douda, Analysis of less-volatile products of poly-L-valine pyrolysis by gas chromatography/Fourier transform infrared spectroscopy/mass spectrometry, J AN AP PYR, 60(1), 2001, pp. 27-40
Citations number
20
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
ISSN journal
01652370 → ACNP
Volume
60
Issue
1
Year of publication
2001
Pages
27 - 40
Database
ISI
SICI code
0165-2370(200106)60:1<27:AOLPOP>2.0.ZU;2-5
Abstract
Less-volatile products of poly-L-valine pyrolysis at 500 degreesC under nit rogen atmosphere were analyzed by the coupled technique of gas chromatograp hy/Fourier transform infrared spectroscopy/mass spectrometry (GC/FTIR/MS). Of 18 compounds identified, there were one isocyanate, one unsaturated carb oxylic acid, two ketones, three unsaturated hydrocarbons, three nitriles, f ive amines, one linear and two cyclic amides (including valine diketopipera zine). Comparison with the composition of less-volatile products of poly-c; ly and poly-Ala pyrolysis, where majority of the compounds were cyclic amin es and amides, shows that the differences between these cases is the presen ce of an isocyanate, unsaturated nitriles, ketones and hydrocarbons in the less-volatile fraction of poly-Val pyrolysate. For cyclic compounds, there is a general trend to form six-membered ring systems tin particular, substi tuted benzenes and pyridines) in the present case, whereas most cyclic prod ucts of poly-Gly and poly-Ala pyrolysis were five-membered mono-N-heterocyc les (substituted pyrrolidines and pyrroles). (C) 2001 Elsevier Science B.V. All rights reserved.