Compound‐specific stable carbon isotope analysis of galaxolide enantiomers in sediment using gas chromatography/isotope ratio monitoring mass spectrometry. (27th June 2013)

• Record Type: Journal Article
• Authors: Wang, Jingzhi; Gao, Shutao; Zeng, Xiangying; Yu, Zhiqiang; Peng, Ping'an; Sheng, Guoying; Fu, Jiamo
• Is Part Of: Rapid communications in mass spectrometry. Volume 27:Number 15(2013)
• Page Start: 1690
• Page End: 1696
• Publication Date: 2013-06-27
• Subjects: Mass spectrometry -- Periodicals; 543.65
• DOI: 10.1002/rcm.6626
• Languages: English
• ISSNs: 0951-4198

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="rcm6626-sec-0001" sec-type="section"> <title>RATIONALE</title> <p>Both chiral analysis and compound‐specific stable carbon isotope analysis have limitations when applied to environmental research. However, the combination of these two techniques might overcome their respective limitation and give more insight into the enantioselective fate and source apportionment of chiral organic contaminants.</p> </sec> <sec id="rcm6626-sec-0002" sec-type="section"> <title>METHODS</title> <p>After Soxhlet extraction and clean‐up, sediment extracts were further pre‐concentrated using normal‐phase preparative high‐performance liquid chromatography to isolate sufficient quantities of highly purified galaxolide (1, 3, 4, 6, 7, 8‐hexahydro‐4, 6, 6, 7, 8, 8‐hexamethylcyclopenta(g)‐2‐benzopyran; HHCB). The enantiomeric fractions and stable carbon isotopes of the HHCB were determined using gas chromatography/mass spectrometry (GC/MS) and GC/isotope ratio mass spectrometry (IRMS).</p> </sec> <sec id="rcm6626-sec-0003" sec-type="section"> <title>RESULTS</title> <p>The method was validated by analysis of the enantiomeric fractions and the stable carbon isotope ratios of the HHCB standard at each step of the pre‐concentration procedure, and no significant enantiomeric and isotopic fractionation was found. The sediment sample was further used to test the developed method, and it was shown that the HHCB enantiomers in the sediment sample exhibited significantly different δ<sup>13</sup>C values (–33.03 to –24.57‰) and a slight enantiomeric fractionation (0.507 and 0.490) from a HHCB standard reference compound (–26.50 to –26.21‰ for δ<sup>13</sup>C values, and 0.519 and 0.497 for enantiomeric fractions).</p> </sec> <sec id="rcm6626-sec-0004" sec-type="section"> <title>CONCLUSIONS</title> <p>This work offers a novel approach to elucidating the sources and the abiotic or biological transformation processes of HHCB in the environment and will offer a perspective for assessing the environment fate of any chiral organic compound. Copyright © 2013 John Wiley & Sons, Ltd.</p> </sec> </abstract>