Aliphatic structure of humic acids; a clue to their origin

Hatcher, Patrick G.; Maciel, Gary E.; Dennis, L.W.

doi:10.1016/0146-6380(81)90012-7

Cited by 133 publications

(46 citation statements)

References 11 publications

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“…1 for the soil groups. agreement with the studies carried out by ISHlWAT ARI (1985) and HATCHER et aL (1981). Sediment and Andisol humic acids showed the highest and the lowest value for the ratio of aliphatic protons p to aromatic ringsl a to aromatic rings, respectively.…”

Section: Resultssupporting

confidence: 79%

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Chemical and biological studies on environmental humic acids II.¹H-nmr and IR spectra of humic acids

Yonebayashi

Hattori

1989

Soil Science and Plant Nutrition

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Section: Resultssupporting

confidence: 79%

“…The NMR spectra of humic acids from terrestrial and aquatic origin indicated the presence of aromatic structures, most likely derived from lignin of vascular plants, as well as paraffinic structures, most likely derived from microbial sources (HATCHER et al 1981).…”

mentioning

confidence: 99%

Chemical and biological studies on environmental humic acids II.¹H-nmr and IR spectra of humic acids

Yonebayashi

Hattori

1989

Soil Science and Plant Nutrition

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“…However, the molecular structure of humic substances being poorly known and still a matter of debate (14,15), other processes may explain how humification takes place. Indeed, several studies suggest that a substantial part of humin is made of lipidic components (8,11,(15)(16)(17). Here, we report the identification of n-alkanes, steroids, isoprenoid, hopanoids, and aliphatic biopolymers trapped in soil humin.…”

Section: Introductionmentioning

confidence: 88%

“…In contrast, several processes have been proposed to explain the formation of soil organic components, named 'humic substances' (5)(6)(7)(8)(9)(10)(11)(12)(13). The plant alteration hypothesis states that lignin and other resistant plant materials in soil undergo only slight changes to form high molecular weight compounds.…”

Section: Introductionmentioning

confidence: 99%

Occurrence of Biomarkers and Straight-Chain Biopolymers in Humin: Implication for the Origin of Soil Organic Matter

Lichtfouse

Leblond

Silva

et al. 1998

Naturwissenschaften

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Soil organic matter is a very complex mixture of compounds derived from the decay of living organisms such as plants, fungi and bacteria. The mechanisms that control the preservation of soil organic matter are poorly known. This is notably due to our scarce knowledge of the molecular structure of humin, the insoluble part of soil organic matter. Three major hypotheses have been proposed to explain the formation of soil organic matter: the plant alteration hypothesis, the microbial synthesis hypothesis and the chemical polymerisation hypothesis. Here we used a "biomarker" approach, developped mainly in sedimentary geochemistry, to gain some insight on the mechanims of preservation of soil organic matter. We analysed the compounds occurring in soil humin. We isolated humin from a maize crop soil by solvent extraction to remove free lipids, then by NaOH extraction to remove humic and fulvic acids, then by HF/HCl treatment to remove minerals. The humin residue was then pyrolysed at 600°C. The pyrolysate was fractionated into alkane/alkene and aromatic fractions by silica gel column chromatography. The fractions were analysed by gas chromatography coupled to mass spectrometry (GC-MS). We identified n-alkanes, n-alkenes, prist-1-ene, sterenes, hopenes and aromatic steroids in the humin pyrolysate. The results show that the stabilisation of soil humic substances may be achieved by selective preservation of lipids, involving three processes: encapsulation of small apolar molecules, chemical bonding of functionalized biomarkers, and preservation of straight-chain microbial polymers.

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“…Whatever their biological origin, the processes leading to the generation and transformation of humic substances are speculative (Hatcher et al, 1981, 1985, Hayes et al, 1989b, Rice and MacCarthy, 1990, De Leeuw and Hatcher, 1992. For instance, the role of the selective preservation of resistant biopolymers vs. the condensation of small organic molecules, is still open to debate.…”

Section: Introductionmentioning

confidence: 99%

Isotope evidence for soil organic carbon pools with distinct turnover rates—II. Humic substances

Lichtfouse¹,

Dou²,

Houot³

et al. 1995

Organic Geochemistry

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Aliphatic structure of humic acids; a clue to their origin

Cited by 133 publications

References 11 publications

Chemical and biological studies on environmental humic acids II.¹H-nmr and IR spectra of humic acids

Chemical and biological studies on environmental humic acids II.¹H-nmr and IR spectra of humic acids

Occurrence of Biomarkers and Straight-Chain Biopolymers in Humin: Implication for the Origin of Soil Organic Matter

Isotope evidence for soil organic carbon pools with distinct turnover rates—II. Humic substances

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Aliphatic structure of humic acids; a clue to their origin

Cited by 133 publications

References 11 publications

Chemical and biological studies on environmental humic acids II.1H-nmr and IR spectra of humic acids

Chemical and biological studies on environmental humic acids II.1H-nmr and IR spectra of humic acids

Occurrence of Biomarkers and Straight-Chain Biopolymers in Humin: Implication for the Origin of Soil Organic Matter

Isotope evidence for soil organic carbon pools with distinct turnover rates—II. Humic substances

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Chemical and biological studies on environmental humic acids II.¹H-nmr and IR spectra of humic acids

Chemical and biological studies on environmental humic acids II.¹H-nmr and IR spectra of humic acids