کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4483355 | 1316885 | 2012 | 11 صفحه PDF | دانلود رایگان |
The elucidation of molecular structures present in dissolved organic matter (DOM) has the potential to unlock many of the queries associated with organic precursors, diagenetic processes and reactivity of this highly complex material. Suwannee River DOM was extensively fractionated by two dimensional hydrophilic interaction chromatography (HILIC)/HILIC and fractions were analyzed via a suite of two and three-dimensional NMR experiments. HILIC provided more greatly resolved fractions with a second dimension and enabled extensive and in-depth NMR analyses. The composite NMR experiments provide strong evidence for highly oxidized sterols as major structural components present in one of the most simplified and subsequently resolved fractions. Further interpretation of data on other fractions across the polarity gradient likewise supports the presence of alicyclic structures present with considerable hydroxyl groups, carboxylic acids and methyl groups associated with quaternary carbon suggesting that further sterol- and hopanoid-type structures are potentially dominant throughout DOM.
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► HILIC and NMR, excellent coupled techniques for the structural analysis of DOM.
► Strong evidence for terpenoid-derived structures in DOM.
► Abundance of cyclic structures with hydroxyl groups and quaternary carbons.
► Multidimensional NMR data indicates oxidized sterols as major component in DOM.
Journal: Water Research - Volume 46, Issue 10, 15 June 2012, Pages 3398–3408