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    Separation of 18α(H)-, 18β(H)-oleanane and lupane by comprehensive two-dimensional gas chromatography

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    Authors
    Eiserbeck, C.
    Nelson, R.
    Grice, Kliti
    Curiale, J.
    Reddy, C.
    Raiteri, Paolo
    Date
    2011
    Type
    Journal Article
    
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    Citation
    Eiserbeck, Christiane and Nelson, Robert K. and Grice, Kliti and Curiale, Joseph and Reddy, Christopher M. and Raiteri, Paolo. 2011. Separation of 18α(H)-, 18β(H)-oleanane and lupane by comprehensive two-dimensional gas chromatography. Journal of Chromatography A. 1218 (32): pp. 5549-5553.
    Source Title
    Journal of Chromatography A
    DOI
    10.1016/j.chroma.2011.06.021
    ISSN
    00219673
    School
    Department of Applied Chemistry
    URI
    http://hdl.handle.net/20.500.11937/34919
    Collection
    • Curtin Research Publications
    Abstract

    18α(H)-, 18β(H)-oleanane and lupane are angiosperm-derived biomarkers that are used as age indicators for the Late Cretaceous onwards when the first proliferation of angiosperms occurred. In addition, the 18α(H)-/18β(H)-oleanane ratio is employed as a thermal maturity parameter of crude oil. However, evidence has shown that accurate quantification of these compounds has been impeded by inadequate chromatographic separation by traditional one-dimensional gas chromatography. In this study, we present the separation of 18α(H)-, 18β(H)-oleanane and lupane with comprehensive two-dimensional gas chromatography (GC x GC). Furthermore, it was observed that 18β(H)-oleanane elutes earlier than 18α(H)-oleanane in second dimension (polarity) which we attribute to steric hindrance effects. Two GC conditions have been developed in order to achieve baseline separation of the triterpenoids of interest in complex mixtures such as sediment extracts and crude oils.

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