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Lignin Transformation of One-Year-Old Plants During Anaerobic Digestion (AD)

1
Institute of Wood Chemical Technology, Faculty of Wood Technology, Poznań University of Life Sciences, Wojska Polskiego 28, 60-637 Poznań, Poland
2
Institute of Biosystems Engineering, Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznań, Poland
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(5), 835; https://doi.org/10.3390/polym11050835
Received: 8 April 2019 / Revised: 30 April 2019 / Accepted: 3 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Natural Compounds for Natural Polymers)
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Abstract

The aim of the research is to identify the changes which occur in lignin from miscanthus and sorghum, one of the main biomass components, as a result of an anaerobic digestion (AD) process. The percentage content and structure of lignin before and after the fermentation process were analysed using biomass harvested in two growing periods—before and after vegetation. It was shown that plants at different developmental stages differ in lignin content. During plant growth, the lignin structure also changes—the syringyl-to-guaiacyl ratio (S/G) increases, whereas the aliphatic and aromatic structure ratio (Al/Ar) decreases. The AD process leads to an increase in percentage lignin content in cell walls, and the increase is higher for plants harvested during vegetation. It has been shown in studies that the methane fermentation of miscanthus and sorghum produces waste containing a large amount of lignin, the structure of which is altered relative to native lignin. The quantity and the new, simplified structure of lignin create new possibilities for using this aromatic polymer. View Full-Text
Keywords: biomass; biopolymers; miscanthus; sorghum; methane fermentation biomass; biopolymers; miscanthus; sorghum; methane fermentation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Waliszewska, H.; Zborowska, M.; Stachowiak-Wencek, A.; Waliszewska, B.; Czekała, W. Lignin Transformation of One-Year-Old Plants During Anaerobic Digestion (AD). Polymers 2019, 11, 835.

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