Structural features of lignin obtained at different alkaline oxidation conditions from sugarcane bagasse

Autor(es)

Maziero, Priscila ^[1] ; de Oliveira Neto, Mario ^[2] ; Machado, Douglas ^[3] ; Batista, Tatiana ^[3] ; Schmitt Cavalheiro, Carla Cristina ^[3] ; Neumann, Miguel G. ^[3] ; Craievich, Aldo Felix ^[4] ; de Moraes Rocha, George Jackson ^[1] ; Polikarpov, Igor ^[2] ; Goncalves, Adilson Roberto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Engn Sch Lorena, BR-12602810 Lorena, SP - Brazil

^[2] Univ Sao Paulo, Inst Phys Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[4] Univ Sao Paulo, Inst Phys, BR-05314970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INDUSTRIAL CROPS AND PRODUCTS; v. 35, n. 1, p. 61-69, JAN 2012.
• Citações Web of Science: 34

Resumo

Lignin is a macromolecule frequently obtained as residue during technological processing of biomass. Modifications in chemical structure of lignin generate valuable products, some with particular and unique characteristics. One of the available methods for modification of industrial lignin is oxidation by hydrogen peroxide. In this work, we conducted systematic studies of the oxidation process that were carried out at various pHs and oxidizing agent concentrations. Biophysical, biochemical, structural properties of the oxidized lignin were analyzed by UV spectrophotometry, Fourier transform infrared spectroscopy, scanning electron microscopy and small angle X-ray scattering. Our results reveal that lignin oxidized with 9.1% H(2)O(2) (m/v) at pH 13.3 has the highest fragmentation, oxidation degree and stability. Although this processing condition might be considered quite severe, we have concluded that the stability of the obtained oxidized lignin was greatly increased. Therefore, the identified processing conditions of oxidation may be of practical interest for industrial applications. (C) 2011 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/00874-5 - Estudos topoquímicos durante obtenção de etanol a partir de celulose de bagaço e palha de cana-de-açúcar
• Beneficiário: Priscila Maziero
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 10/16542-9 - Estudos de enzimas celulolíticas com potencial na transformação enzimática da biomassa de cana-de-açúcar utilizando espalhamento de raios-X a baixo ângulo
• Beneficiário: Mario de Oliveira Neto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado