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Thermodesorption—gas Chroamtography—mass Spectrometric Analysis of Biological Materials for Potential Molecular Precursors of the Constituents of the Crude Oils by Wilhelm Püttmann is a Chemistry article available to read on EtoBox.

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## Thermodesorption technique coupled on-line with gas chromatography (GC) and mass spectrometry (MS) has been developed for the determination of hydrocarbons trapped in coal and rock samples. The method can also be applied to the determination of volatile constituents present in biological materials. The desorption step is carried out in the pre-heated injector of a gas chromatograph. The mobilized compounds are transferred without splitting to the initial part of a cold CC column. After 10 min of desorption the GC-MS analysis is started. The identification of individual compounds is achieved by GC-MS analysis of related molecular ions or significant fragment ions. When micro-samples (0.25-2.0 mg) of dried plant material are heated to 300°C in a helium stream, compounds such as long-chain fatty acids, carboxylic acid esters, aldehydes and ketones as well as steroids and tocopherols are desorbed from the biological matrix without decomposition. In addition, the thermally labile chlorophylls decompose to yield phytadienes as pyrolysis products of the phytyl moiety. The phytadienes can be used to estimate the original amount of chlorophyll present in the sample and to determine the c

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Author

Wilhelm Püttmann

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)

Published

1991

Language

EN

Field

Chemistry (Physical Sciences)