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Rapid Commun Mass Spectrom

Title:		Site-specific carbon isotope analysis of aromatic carboxylic acids by elemental analysis/pyrolysis/isotope ratio mass spectrometry
Author(s):		Oba Y; Naraoka H;
Address:		"Graduate School of Natural Science and Technology, Okayama University, 1-1, Naka 3-chome, Tsushima, Okayama 700-8530, Japan. dns16601@cc.okayama-u.ac.jp"
Journal Title:		Rapid Commun Mass Spectrom
Year:		2006
Volume:		20
Issue:		24
Page Number:		3649 - 3653
DOI:		10.1002/rcm.2777
ISSN/ISBN:		0951-4198 (Print) 0951-4198 (Linking)
Abstract:		"Site-specific carbon isotope composition of organic compounds can provide useful information on their origin and history in natural environments. Site-specific isotope analyses of small amounts of organic compounds (sub-nanomolar level), such as short-chain carboxylic acids and amino acid analogues, have been performed using gas chromatography/pyrolysis/isotope ratio mass spectrometry (GC/pyrolysis/IRMS). These analyses were previously limited to volatile compounds. In this study, site-specific carbon isotope analysis has been developed for non-volatile aromatic carboxylic acids at sub-micromolar level by decarboxylation using a continuous flow elemental analysis (EA)/pyrolysis/IRMS technique. Benzoic acid, 2-naphthylacetic acid and 1-pyrenecarboxylic acid were pyrolyzed at 500-1000 degrees C by EA/pyrolysis/IRMS to produce CO2 for delta13C measurement of the carboxyl group. These three aromatic acids were most efficiently pyrolyzed at 750 degrees C. Conventional sealed-tube pyrolysis was also conducted for comparison. The delta13C values of CO2 generated by the continuous flow technique were within 1.0 per thousand of those performed by the conventional technique, indicating that the new continuous flow technique can accurately analyze the carbon isotopic composition of the carboxyl group in aromatic carboxylic acids. The new continuous flow technique is simple, rapid and uses small sample sizes, so this technique will be useful for characterizing the isotopic signature of carboxyl groups in organic compounds"
Keywords:
Notes:		"PubMed-not-MEDLINEOba, Yasuhiro Naraoka, Hiroshi eng England 2006/11/10 Rapid Commun Mass Spectrom. 2006; 20(24):3649-53. doi: 10.1002/rcm.2777"