Influence of chain length in protic ionic liquids on physicochemical and structural features of lignins from sugarcane bagasse

Autor(es)

Pin, Thaynara C. ^{[1, 2]} ; Brenelli, Livia B. ^[3] ; Nascimento, Viviane M. ^{[1, 4]} ; Costa, Aline C. ^[1] ; Pu, Yunqiao ^[5] ; Ragauskas, Arthur J. ^{[2, 5, 6]} ; Rabelo, Sarita C. ^[7]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Sch Chem Engn, Ave Albert Einstein, BR-13083852 Campinas, SP - Brazil

^[2] Univ Tennessee, Dept Chem & Biomol Engn, Middle Dr, Knoxville, TN 37916 - USA

^[3] Univ Campinas UNICAMP, Interdisciplinary Ctr Energy Planning NIPE, R Cora Coralina, BR-13083896 Campinas, SP - Brazil

^[4] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Biorenewables Natl Lab LNBR, R Giuseppe Maximo Scolfaro, BR-13083970 Campinas, SP - Brazil

^[5] Oak Ridge Natl Lab ORNL, Joint Inst Biol Sci, Biosci Div, Bethel Valley Rd, Oak Ridge, TN 37831 - USA

^[6] Univ Tennessee, Dept Forestry Wildlife & Fisheries, Ctr Renewable Carbon, Inst Agr, Morgan Cir Dr, Knoxville, TN 37996 - USA

^[7] Sao Paulo State Univ UNESP, Coll Agr Sci, Dept Bioproc & Biotechnol, Ave Univ, BR-18610034 Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INDUSTRIAL CROPS AND PRODUCTS; v. 159, JAN 2021.
• Citações Web of Science: 0

Resumo

The mechanisms behind lignin dissolution with protic ionic liquids (PILs) and their influence over lignin properties remain not fully explored. In this work, physicochemical and structural features of lignins extracted from sugarcane bagasse after pretreatment with a series of PILs (length of the cation chain combined with different anions) were assessed using analytical techniques. It was found that the lignin extracted with shorter chain length cations PILs showed the highest beta-O-4 content. Opposite, the increase of the PILs cation chain length resulted in enhanced depolymerization. All lignins presented high polydispersity (>3.7), while the weight average molecular ranged from 1921 to 13,539 g/mol. The recovered {[}Eti]{[}Mal] lignin presented the higher beta-O-4 content and was possibly the most preserved lignin obtained. Opposite, lignin isolated from {[}Hex]{[}Ac] and {[}Hex]{[}For] treatments had less beta-O-4 linkages attributed to the depolymerization of lignin via rupture of ether linkages generating intermediates that further repolymerized and/or depolymerized. These results suggest that the ionicity of the PIL is a crucial factor for lignin dissolution. Furthermore, these results illustrate that the proposed pretreatment using different PILs is useful to obtain high-quality lignins with distinct features and opens a new perspective for materials to match various applications. (AU)

• Processo FAPESP: 17/15477-8 - Desenvolvimento de um processo de pré-tratamento de baixa severidade para produção de oligossacarídeos de palha de cana-de-açúcar
• Beneficiário: Lívia Beatriz Brenelli de Paiva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/20630-4 - Desenvolvimento integrado de biorrefinaria e planta de bioetanol de cana-de-açúcar com emissão zero de CO2: rotas para converter recursos renováveis em bioprodutos e bioeletricidade
• Beneficiário: Rubens Maciel Filho
• Modalidade de apoio: Auxílio à Pesquisa - Temático