Lignin contribution to aliphatic constituents of humic acids through fungal degradation

Seyyedhadi Khatami, Ying Deng, Ming Tien, Patrick G. Hatcher

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

To investigate how fungi transform lignin in soil during humification, a naturally brown-rotted wood was subjected to additional fungal degradation by the white-rot fungus Phanerochaete chrysosporium. Both Fourier transform infrared spectroscopy and ultrahigh resolution mass spectrometry showed that fungal degradation, an integral part of the soil humification process, transformed lignin-derived aromatic molecules and simultaneously created many new aliphatic molecules. The majority of these new aliphatic molecules were chemically different from aliphatic molecules already existent in the lignin precursor extract and in the P. chrysosporium biomass. Our results strongly suggest that humification by white-rot fungi in soil transforms lignin to humic substances with a predominant aliphatic character. This challenges the concept that only aromatic structures are expected from humification of lignin by fungi. This finding also reverses current views that aliphatic constituents of soil humic materials are not principally derived from lignin.

Original languageEnglish (US)
Pages (from-to)1565-1570
Number of pages6
JournalJournal of Environmental Quality
Volume48
Issue number6
DOIs
StatePublished - Jan 1 2019

Fingerprint

Lignin
humic acid
lignin
humification
Fungi
Degradation
degradation
fungus
Soils
Molecules
transform
soil
humic substance
FTIR spectroscopy
Fourier transform infrared spectroscopy
Mass spectrometry
Humic Substances
Wood
Biomass
mass spectrometry

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law

Cite this

Khatami, Seyyedhadi ; Deng, Ying ; Tien, Ming ; Hatcher, Patrick G. / Lignin contribution to aliphatic constituents of humic acids through fungal degradation. In: Journal of Environmental Quality. 2019 ; Vol. 48, No. 6. pp. 1565-1570.
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Lignin contribution to aliphatic constituents of humic acids through fungal degradation. / Khatami, Seyyedhadi; Deng, Ying; Tien, Ming; Hatcher, Patrick G.

In: Journal of Environmental Quality, Vol. 48, No. 6, 01.01.2019, p. 1565-1570.

Research output: Contribution to journalArticle

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AU - Tien, Ming

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AB - To investigate how fungi transform lignin in soil during humification, a naturally brown-rotted wood was subjected to additional fungal degradation by the white-rot fungus Phanerochaete chrysosporium. Both Fourier transform infrared spectroscopy and ultrahigh resolution mass spectrometry showed that fungal degradation, an integral part of the soil humification process, transformed lignin-derived aromatic molecules and simultaneously created many new aliphatic molecules. The majority of these new aliphatic molecules were chemically different from aliphatic molecules already existent in the lignin precursor extract and in the P. chrysosporium biomass. Our results strongly suggest that humification by white-rot fungi in soil transforms lignin to humic substances with a predominant aliphatic character. This challenges the concept that only aromatic structures are expected from humification of lignin by fungi. This finding also reverses current views that aliphatic constituents of soil humic materials are not principally derived from lignin.

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