Abstract
Lignin is a copolymer of three main hydroxycinnamyl alcohols identified as p-hydroxyphenyl (H), guaiacyl (G), and syringyl (S) units. The highly condensed matrix (core lignin) may also be associated with low-molecular phenolics as hydroxycinnamic acids mainly p-coumaric, caffeic, ferulic, and sinapic acids dubbed noncore lignins. Lignin confers hydrophobicity and mechanical and chemical strength for tissues, providing a barrier against the attack of pathogens and herbivores. The content and composition of lignin are strongly affected by biotic and abiotic stresses. Besides core and noncore lignin, free phenolic compounds perform a relevant activity in response to plant stresses. The toxicity of allelochemicals is partially due to their ability to bind and inhibit enzyme activities. The presence of lignin imposes a physical barrier to the action of enzymes in saccharification of plant cell wall polysaccharides to the production of cellulosic ethanol. The presence of endogenous phenolic compounds as well as treatments to degrade lignin, in turn, release phenolic compounds that adsorb and inhibit cellulases, xylanases, and accessory enzymes. This chapter provides basic information on phenolic compounds of interest to support the sustainable use of alga and plant biomasses as raw materials for the production of biofuels discussing the main approaches ongoing to reduce their negative impact in biomass saccharification.
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de Oliveira, D.M. et al. (2017). Phenolic Compounds in Plants: Implications for Bioenergy. In: Buckeridge, M., De Souza, A. (eds) Advances of Basic Science for Second Generation Bioethanol from Sugarcane. Springer, Cham. https://doi.org/10.1007/978-3-319-49826-3_4
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DOI: https://doi.org/10.1007/978-3-319-49826-3_4
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