Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7816881 | Organic Geochemistry | 2018 | 15 Pages |
Abstract
We present a novel method to measure the 13C/12C isotope ratio (reported as δ13C) of individual, intact bacteriohopanepolyols (BHPs) using semi-preparative ultrahigh pressure liquid chromatography (UPLC) followed by high temperature gas chromatography-isotope ratio mass spectrometry (HT-GC-IRMS). The method is reproducible, as indicated by the precision of δ13C values for bacteriohopanetetrol (BHT) extracted from R. palustris biomass and analyzed across an order-of-magnitude range of IRMS peak areas (δ13Câ¯=â¯â33.4â¯Â±â¯0.6â° VPDB, nâ¯=â¯94, ±1Ï). To show that this method successfully separates individual BHPs from complex environmental matrices, we report δ13C values for BHT and the BHT stereoisomer (BHT-II) from a ca. 2.9â¯Ma, organic-rich Mediterranean Sea sediment sample. These analyses suggest that intact BHP δ13C measurements can greatly improve the interpretation of environmental signals by alleviating the need for side-chain cleavage which reduces BHP source-specificity.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Jordon D. Hemingway, Stephanie Kusch, Sunita R. Shah Walter, Catherine A. Polik, Felix J. Elling, Ann Pearson,