Pyrolysis-GC-MS and NMR studies of dissolved seawater humic substances and isolates of a marine diatom

Andrew H Gillam, Michael A. Wilson

    Research output: Contribution to journalArticle

    Abstract

    13C- and 1H-NMR spectra were obtained for humic substances isolated from a coastal marine environment and also for the intracellular and extracellular extracts of a marine diatom. Phaeodactylum tricornutum Bohlin. Highly branched alkyl chains constitute a large proportion of the structure of the marine humic material, whereas aromatic components are less important. Carbohydrate-type materials, possibly uronic acids, are also present in appreciable amounts. Furans (derived from carbohydrates). pyrroles and nitriles (derived from proteins, nucleic acids and/or tetrapyrroles) and phenols and methylphenols (non-lignin derived) are pyrolysis products derived from pyrolysis-gas chromatography-mass spectrometry of the extracts. The results indicate the similarities in chemical structure of P. tricornutum exudate and dissolved marine humic material. © 1985.

    Original languageEnglish
    Pages (from-to)15-25
    Number of pages11
    JournalOrganic Geochemistry
    Volume8
    Issue number1
    Publication statusPublished - 1985

    Keywords

    • dissolved humic substances
    • gas chromatography - mass spectrometry (GC-MS)
    • marine diatom
    • marine humic substances
    • nuclear magnetic resonance (NMR)
    • Phaedacylum tricornutum Bohlin
    • pyrolysis

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