Síntese E Caracterização De Compósitos De Fosfato De Cálcio E Nanofibras De Celulose Visando Aplicação No Reparo De Tecidos Ósseos

The 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.

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

Moulin

Durães

Dias

et al. 2021

Holzforschung

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Síntese E Caracterização De Compósitos De Fosfato De Cálcio E Nanofibras De Celulose Visando Aplicação No Reparo De Tecidos Ósseos

Abstract: RESUMO: O reparo fisiológico do tecido ósseo é inviável dependendo da extensão e gravidade da lesão

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

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

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