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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 10
[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
Total Affiliations: 4
Document type: Journal article
Source: INDUSTRIAL CROPS AND PRODUCTS; v. 35, n. 1, p. 61-69, JAN 2012.
Web of Science Citations: 34

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)

FAPESP's process: 09/00874-5 - Topochemical studies during cellulosic ethanol production from sugarcane bagasse and straw
Grantee:Priscila Maziero
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 10/16542-9 - Studies of the cellulolytic enzymes with potential in the enzymatic transformation of the sugarcane biomass using Small Angle X-ray Scattering
Grantee:Mario de Oliveira Neto
Support type: Scholarships in Brazil - Post-Doctorate