Bock, Peter

Elder, Thomas

Gierlinger, Notburga

Nousiainen, Paula

Potthast, Antje

English

JKI Open Journal Systems (Julius Kühn-Institut)

2nd International Plant Spectroscopy Conference (IPSC) 2019, Berlin, 24 - 28 March 40 03-04: Lignin – I see you! Peter Bock1, Paula Nousiainen2, Thomas Elder3, Antje Potthast4 and Notburga Gierlinger1 1Institute of Biophysics, University of Natural Resources and Life Sciences, Vienna, Austria 2Department of Chemistry, University of Helsinki, Helsinki, Finland 3USDA Forest Service, Southern Research Station, Auburn, USA 4Division of Chemistry of Renewable Resources, University of Natural Resources and Life Sciences, Vienna, Austria E-mail: peter.bock@boku.ac.at Raman microscopy is a fast way of probing plant material in the native state. While morphological changes are often easy to see on intensity maps, the chemical information is harder to extract, because all substances found at a pixel contribute to its spectrum. Lignin is frequently identified as a major contributor in plant cell wall spectra. Despite its rich structural diversity, the major contribution in the Raman spectrum stems from conjugated aromatic structures such as cinnamyl aldehydes or alcohols [1]. These substances are frequently identified in Raman studies, although their quantitiy in lignin is usually about 5% each [2]. Biphenyls and dibenzodioxocins are also conjugated structures and their share in spruce lignin is estimated to be around 20% [2]. With the help of quantum-chemical calculations, we discuss Rama  n spectra of three model compounds and present an updated assignment of the lignin spectrum.  This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No [681885]). References [1] BOCK, P., and N. GIERLINGER. Infrared and Raman spectra of lignin substructures: Coniferyl alcohol, abietin and coniferyl aldehyde. Journal of Raman Spectroscopy - under revision. [2] CAPANEMA, E., et al., 2004: Journal of Agricultural and Food Chemistry, 52, 1850-1860.  

Lignin – I see you!

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Lignin – I see you!

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