Structural characterization of sugarcane lignins extracted from different protic ionic liquid pretreatments

Autor(es)

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

Afiliação do(s) autor(es)

^[1] Univ Tennessee, Dept Chem & Biomol Engn, Middle Dr, Knoxville, TN 37916 - USA

^[2] Univ Estadual Campinas, Chem Engn Fac, UNICAMP, Av Albert Einstein, BR-13083852 Campinas, SP - Brazil

^[3] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Biorenewables Natl Lab LNBR, BR-13083970 Campinas, SP - Brazil

^[4] Oak Ridge Natl Lab ORNL, Biosci Div, Joint Inst Biol Sci, Bethel Valley Rd, Oak Ridge, TN 37831 - USA

^[5] Univ Tennessee, Ctr Renewable Carbon, Inst Agr, Dept Forestry Wildlife & Fisheries, Knoxville, TN 37996 - USA

^[6] Sao Paulo State Univ UNESP, Coll Agr Sci, Dept Bioproc & Biotechnol, Av Univ, BR-18610034 Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: RENEWABLE ENERGY; v. 161, p. 579-592, DEC 2020.
• Citações Web of Science: 6

Resumo

Previous studies based on protic ionic liquids have shown them to be effective for extracting lignins from biomass. Moreover, ILs synthesized with amine cations can promote the insertion of nitrogen into lignin, favoring its valorization for industrial applications. In this study, lignins extracted from sugarcane bagasse by eight different PILs were analyzed. Several techniques of characterization were employed (2D HSQC NMR, 31P NMR, GPC, Py-GC/MS, TGA, FTIR, and elemental analysis), seeking a deeper understanding of lignin structure post-PILS treatment. In particular, lignin obtained with acetate and lactate anions with monoethanolamonium cations showed similar structural compositions. Lignins obtained from ethylenediamonium cation combined anions acetate and lactate exhibited relatively higher molecular weights compared to the other lignins studied. The elemental analysis of these lignins further revealed the presence of nitrogen in their structures, suggesting that amination occurred. In this work we used PILs not yet reported in the literature for this purpose, and consequently obtained lignins with specific structures. Overall, our results demonstrated that depending on the PILs used, lignins with distinct properties could be obtained which might be used for value-added applications. This work covered new advances in elucidation of lignin chemical structure and opened a new path for lignin valorization. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

• 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