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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Effects of Xylan Side-Chain Substitutions on Xylan-Cellulose Interactions and Implications for Thermal Pretreatment of Cellulosic Biomass

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Autor(es):
Pereira, Caroline S. ; Silveira, Rodrigo L. ; Dupree, Paul ; Skaf, Munir S.
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: Biomacromolecules; v. 18, n. 4, p. 1311-1321, APR 2017.
Citações Web of Science: 24
Resumo

Lignocellulosic biomass is mainly constituted by cellulose, hemicellulose, and lignin and represents an important resource for the sustainable production of biofuels and green chemistry materials. Xylans, a common hemicellulose, interact with cellulose and often exhibit various side chain substitutions including acetate, (4-O-methyl) glucuronic acid, and arabinose. Recent studies have shown that the distribution of xylan substitutions is not random, but follows patterns that are dependent on the plant taxonomic family and cell wall type. Here, we use molecular dynamics simulations to investigate the role of substitutions on xylan interactions with the hydrophilic cellulose face, using the recently discovered xylan decoration pattern of the conifer gymnosperms as a model. The results show that alpha-1,2-linked substitutions stabilize the binding of single xylan chains independently of the nature of the substitution and that Ca2+ ions can mediate cross-links between glucuronic acid substitutions of two neighboring xylan chains, thus stabilizing binding. At high temperature, xylans move from the hydrophilic to the hydrophobic cellulose surface and are also stabilized by Ca2+ cross-links. Our results help to explain the role of substitutions on xylan-cellulose interactions, and improve our understanding of the plant cell wall architecture and the fundamentals of biomass pretreatments. (AU)

Processo FAPESP: 15/25031-1 - Dinâmica molecular de enzimas modificadores de de carbohidratos para desconstrução e valorização de biomassa lignocelulósica
Beneficiário:Caroline Simões Pereira
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 14/10448-1 - Aspectos moleculares da arquitetura de paredes celulares de plantas
Beneficiário:Rodrigo Leandro Silveira
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
Beneficiário:Munir Salomao Skaf
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs