Disruptive enzyme-based strategies to isolate nanocelluloses: a review

Pirich, Cleverton Luiz; Picheth, Guilherme Fadel; Fontes, André Mazega; Delgado-Aguilar, Marc; Ramos, Luiz Pereira

doi:10.1007/s10570-020-03185-8

Cited by 23 publications

(10 citation statements)

References 102 publications

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“…differs from the cellulase from the microscopic fungus Trichoderma reesei not only in activity, but also in constituent enzymes, whose synergistic correlation is responsible for the efficiency of the cellulosic material bioconversion process and, consequently, for changes in structure of the tested material. Moreover, Houfani et al [ 91 ], Pirich et al [ 92 ], Arantes et al [ 33 ] and Albornoz-Palma et al [ 32 ] also emphasized in their work that the effectiveness of enzymatic cellulose hydrolysis is influenced by properly selected cellulases, which should synergistically correlate with each other.…”

Section: Resultsmentioning

confidence: 99%

Production of Nanocellulose by Enzymatic Treatment for Application in Polymer Composites

et al. 2021

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In the last few years, the scientific community around the world has devoted a lot of attention to the search for the best methods of obtaining nanocellulose. In this work, nanocellulose was obtained in enzymatic reactions with strictly defined dispersion and structural parameters in order to use it as a filler for polymers. The controlled enzymatic hydrolysis of the polysaccharide was carried out in the presence of cellulolytic enzymes from microscopic fungi—Trichoderma reesei and Aspergillus sp. It has been shown that the efficiency of bioconversion of cellulose material depends on the type of enzymes used. The use of a complex of cellulases obtained from a fungus of the genus Trichoderma turned out to be an effective method of obtaining cellulose of nanometric dimensions with a very low polydispersity. The effect of cellulose enzymatic reactions was assessed using the technique of high-performance liquid chromatography coupled with a refractometric detector, X-ray diffraction, dynamic light scattering and Fourier transform infrared spectroscopy. In the second stage, polypropylene composites with nanometric cellulose were obtained by extrusion and injection. It was found by means of X-ray diffraction, hot stage optical microscopy and differential scanning calorimetry that nanocellulose had a significant effect on the supermolecular structure, nucleation activity and the course of phase transitions of the obtained polymer nanocomposites. Moreover, the obtained nanocomposites are characterized by very good strength properties. This paper describes for the first time that the obtained cellulose nanofillers with defined parameters can be used for the production of polymer composites with a strictly defined polymorphic structure, which in turn may influence future decision making about obtaining materials with controllable properties, e.g., high flexibility, enabling the thermoforming process of packaging.

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Section: Resultsmentioning

confidence: 99%

Production of Nanocellulose by Enzymatic Treatment for Application in Polymer Composites

et al. 2021

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“…Their ability to attack cellulose fibers with a high selectivity enables different types of modifications over cellulose. Cellulases are a specific class of enzymes that directly catalyze the hydrolysis of cellulose into simpler sugars, hence being commonly produced by cellulolytic organisms such as those from the genera Clostridium , Trichoderma , and Aspergillus , among others [ 14 ].…”

Section: Nanocellulose Production By Enzymatic Hydrolysismentioning

confidence: 99%

“…While an extended action of CBHs will result in a decrease of cellulose fibers [ 14 ], their action can be partially constrained by an accumulation of cellobiose through a mechanism of end-product inhibition [ 14 ], which would be favorable to prevent thorough enzymatic degradation. This would especially happen when low levels of β-glucosidase are present, which possibly explains numerous works employing Celluclast for NC production [ 27 , 36 , 47 , 65 ].…”

Section: Nanocellulose Production By Enzymatic Hydrolysismentioning

confidence: 99%

“…A recent review by Pirich et al [ 14 ] refers to another potential key element in the properties of the selected enzymes. According to the authors, the absence of CBMs, which is commonly associated to a higher affinity of enzymes to crystalline cellulose, can possibly result in inferior hydrolysis of the crystalline regions, a desirable trait in nanocellulose production.…”

Section: Nanocellulose Production By Enzymatic Hydrolysismentioning

confidence: 99%

“…Ribeiro and co-workers [ 13 ] have recently reviewed the enzymatic pathway for NC production, focusing on the characterization methods and the catalytic mechanism. On the other hand, Pirich et al [ 14 ] recently published a review dedicated to enzyme-based strategies to produce nanocellulose.…”

Section: Introductionmentioning

confidence: 99%

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Nanocellulose Production: Exploring the Enzymatic Route and Residues of Pulp and Paper Industry

et al. 2020

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Increasing environmental and sustainability concerns, caused by current population growth, has promoted a raising utilization of renewable bio-resources for the production of materials and energy. Recently, nanocellulose (NC) has been receiving great attention due to its many attractive features such as non-toxic nature, biocompatibility, and biodegradability, associated with its mechanical properties and those related to its nanoscale, emerging as a promising material in many sectors, namely packaging, regenerative medicine, and electronics, among others. Nanofibers and nanocrystals, derived from cellulose sources, have been mainly produced by mechanical and chemical treatments; however, the use of cellulases to obtain NC attracted much attention due to their environmentally friendly character. This review presents an overview of general concepts in NC production. Especial emphasis is given to enzymatic hydrolysis processes using cellulases and the utilization of pulp and paper industry residues. Integrated process for the production of NC and other high-value products through enzymatic hydrolysis is also approached. Major challenges found in this context are discussed along with its properties, potential application, and future perspectives of the use of enzymatic hydrolysis as a pretreatment in the scale-up of NC production.

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Tribological performances of cellulose nanocrystals in water‐based lubricating fluid

Rocha

Oliveira

Lemos

et al. 2022

J of Applied Polymer Sci

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This work aimed to prepare and characterize cellulose nanocrystals as an additive to a water‐based lubricating fluid. Different concentrations of the cellulose nanocrystals suspensions (0.50–1.25%wt) were added to the lubricant fluid. The nanolubricants were submitted to the pin‐disk test. The rigid/severe electrodynamic lubrication regime was conducted under different rotation speeds (500 and 63 rpm) and external loads (8.47 and 1.77 N). The cellulose nanocrystals showed a high yield (74%), an aspect ratio from 23 to 35, and thermal stability at 219.0°C. The coefficient of friction increased from 4% to 97%) with the addition of the cellulose nanocrystals for the test at 500 rpm and decreased by up to 50% at 63 rpm both at 8.47 N. The wear rate reduced with increasing concentration of nanocrystals in the lubricant fluid, showing a reduction by up to 99% at 500 rpm–8.47 N compared with fluid without nanocrystals.

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Disruptive enzyme-based strategies to isolate nanocelluloses: a review

Cited by 23 publications

References 102 publications

Production of Nanocellulose by Enzymatic Treatment for Application in Polymer Composites

Production of Nanocellulose by Enzymatic Treatment for Application in Polymer Composites

Nanocellulose Production: Exploring the Enzymatic Route and Residues of Pulp and Paper Industry

Tribological performances of cellulose nanocrystals in water‐based lubricating fluid

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