Evaluation of changes in cellulose micro/nanofibrils structure under chemical and enzymatic pre-treatments
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Jordão Cabral Moulin
, Alisson Farley Soares Durães
, Matheus Cordazzo Dias
, Luiz Eduardo Silva
Abstract
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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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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© 2021 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Original Articles
- Variations in heartwood formation and wood density as a function of age and plant spacing in a fast-growing eucalyptus plantation
- On-line characterization of wood chip brightness and chemical composition by means of visible and near-infrared spectroscopy
- Extractives in Betula celtiberica stemwood and isolation and identification of diarylheptanoids in the hydrophilic extract
- High recovery of stilbene glucosides by acetone extraction of fresh inner bark of Norway spruce
- Natural cork and its agglomerates as substitutes for high-density expanded polystyrene foams in sandwich cores
- Understanding the thermal durability of wood-based composites (WBCs) using crack propagation fracture toughness
- Evaluation of changes in cellulose micro/nanofibrils structure under chemical and enzymatic pre-treatments
- Multi-scale evaluation of the effect of saturated steam on the micromechanical properties of Moso bamboo
- Short Note
- Wood modification with N-methylol and N-methyl compounds: a case study on how non-fixated chemicals in modified wood may affect the classification of their durability
Articles in the same Issue
- Frontmatter
- Original Articles
- Variations in heartwood formation and wood density as a function of age and plant spacing in a fast-growing eucalyptus plantation
- On-line characterization of wood chip brightness and chemical composition by means of visible and near-infrared spectroscopy
- Extractives in Betula celtiberica stemwood and isolation and identification of diarylheptanoids in the hydrophilic extract
- High recovery of stilbene glucosides by acetone extraction of fresh inner bark of Norway spruce
- Natural cork and its agglomerates as substitutes for high-density expanded polystyrene foams in sandwich cores
- Understanding the thermal durability of wood-based composites (WBCs) using crack propagation fracture toughness
- Evaluation of changes in cellulose micro/nanofibrils structure under chemical and enzymatic pre-treatments
- Multi-scale evaluation of the effect of saturated steam on the micromechanical properties of Moso bamboo
- Short Note
- Wood modification with N-methylol and N-methyl compounds: a case study on how non-fixated chemicals in modified wood may affect the classification of their durability