Evaluation of changes in cellulose micro/nanofibrils structure under chemical and enzymatic pre-treatments

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorMoulin, Jordão Cabral-
Autor(es): dc.creatorDurães, Alisson Farley Soares-
Autor(es): dc.creatorDias, Matheus Cordazzo-
Autor(es): dc.creatorSilva, Luiz Eduardo-
Autor(es): dc.creatorSantos, Allan de Amorim dos-
Autor(es): dc.creatorDamásio, Renato Augusto Pereira-
Autor(es): dc.creatorUgucioni, Júlio César-
Autor(es): dc.creatorTonoli, Gustavo Henrique Denzin-
Data de aceite: dc.date.accessioned2026-02-09T11:13:35Z-
Data de disponibilização: dc.date.available2026-02-09T11:13:35Z-
Data de envio: dc.date.issued2022-08-03-
Data de envio: dc.date.issued2022-08-03-
Data de envio: dc.date.issued2020-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br/handle/1/50811-
Fonte completa do material: dc.identifierhttps://www.degruyter.com/document/doi/10.1515/hf-2020-0231/html-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1136334-
Descrição: dc.descriptionThe objective of the present work was to evaluate the use of Raman microspectroscopy analysis to assess changes in cellulose micro/nanofibril structure from fibers subjected to different pre-treatments. Pulp fibers were pre-treated with 5 wt% NaOH for 2 h, 10 wt% NaOH for 1 h, and endoglucanase-type enzymes to improve nanofibrilation. After the pre-treatments, the fibers were mechanically fibrillated to produce cellulose micro/nanofibrils, which were made into films to be analyzed. Fibers pre-treated with 5 wt% NaOH produced 59% micro/nanofibrils with average diameter less than 30 nm, for Eucalyptus, and 46% of micro/nanofibrils, with the same diameter, for Pinus. However, the enzymatic pre-treatment was the most efficient, resulting in 83% of micro/nanofibrils for Eucalyptus and 78% for Pinus. This corroborates with the lowest values of the 1.096/2.896 ratio and degree of polymerization, indicating chain shortening in cellulose. X-ray diffraction and Raman microspectroscopy crystallinity results presented similar tendencies, with increased crystallinity caused by all pre-treatments, being 5 wt% NaOH for 2 h the highest, with 70%, for Eucalyptus and Pinus. Enzymatic pre-treatment has produced the best fibrillation and greater crystallinity. The present work has shown a reliable way of assessing cellulose structure using Raman microspectroscopy.-
Idioma: dc.languageen-
Publicador: dc.publisherDe Gruyter-
Direitos: dc.rightsrestrictAccess-
???dc.source???: dc.sourceHolzforschung-
Palavras-chave: dc.subjectCellulose structure-
Palavras-chave: dc.subjectChemical characterization-
Palavras-chave: dc.subjectEnzymes-
Palavras-chave: dc.subjectNanofibrillated cellulose-
Palavras-chave: dc.subjectPre-treatments-
Título: dc.titleEvaluation of changes in cellulose micro/nanofibrils structure under chemical and enzymatic pre-treatments-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

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