Identification of bound alcohols in soil humic acids by gas chromatography-mass spectrometry
2000
Berthier, Gersende | Dou, Sen | Peakman, Torren | Lichtfouse, Eric | Collège Louisa Paulin ; Collège Louisa Paulin | Depatrment of Soil Science ; Jilin Normal University | School of Chemistry ; University of Bristol [Bristol] | Agronomy for Sustainable Development (ASD) ; Institut National de la Recherche Agronomique (INRA)
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Afficher plus [+] Moins [-]anglais. Humic acids are complex, partly macromolecular, yellow-brownish substances occurring in soils, waters and sediments. In order to shed some light on their molecular structure, crop humic acids were cleaved by alkaline hydrolysis (KOH). The products were fractionated by thin layer chromatography to give mono-alcohols which were analysed as acetate derivatives by gas chromatography coupled to mass spectrometry. Linear alcohols, sterols, stanols and plant-derived triterpenoid alcohols were identified by co-injection of pure standards and by comparison with literature data. These findings imply that alcohols could have been incorporated into the humic matrix by esterification with carboxylic acids. Furthermore, the presence of stanols as hydrogenated counterparts of sterols suggests that a process of hydrogenation is operating in soils.
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