Cellulose Nanostructures Obtained from Waste Paper Industry: A Comparison of Acid and Mechanical Isolation Methods

Souza, Alana G.; Kano, Fabiany Sayuri; Bonvent, Jean-Jacques; Rosa, Derval dos Santos

doi:10.1590/1980-5373-mr-2016-0863

Cited by 41 publications

(27 citation statements)

References 24 publications

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“…Visual inspection of the extracted cellulose microfibers using a microscope ( Figure 1 ) indicated that their morphology exhibited a rod-like microstructure, with some individual cellulose microfibers arranged longitudinally, presumably due to hydrogen bonding network among macro-scale cellulose microfibers [ 39 ]. The cellulose matrix is shown in Figure 1 A. Microfibers appear to be embedded in the matrix, organized in bundles and their size varies between 100 and 1500 μm, with some of the fibers being arranged longitudinally and attached to each other by hydrogen bonds This morphology and fibers length is in agreement with previously published works [ 27 , 40 , 41 , 42 ]. The cellulose microfibers isolated from waste newspaper appeared to be less uniform, which can be attributed to the possible uncontrolled cleavage of cellulose chains during acid hydrolysis [ 27 ].…”

Section: Resultssupporting

confidence: 90%

“…The cellulose matrix is shown in Figure 1A. Microfibers appear to be embedded in the matrix, organized in bundles and their size varies between 100 and 1500 µm, with some of the fibers being arranged longitudinally and attached to each other by hydrogen bonds This morphology and fibers length is in agreement with previously published works [27,[40][41][42]. The cellulose microfibers isolated from waste newspaper appeared to be less uniform, which can be attributed to the possible uncontrolled cleavage of cellulose chains during acid hydrolysis [27].…”

Section: Extraction and Characterization Of Cellulose Microfibers Frosupporting

confidence: 90%

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Reduce, Reuse and Recycle in Protein Chromatography: Development of an Affinity Adsorbent from Waste Paper and Its Application for the Purification of Proteases from Fish By-Products

Premetis

Labrou

2020

Biomolecules

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In the present study, we report the development of a cellulose-based affinity adsorbent and its application for the purification of proteases from fish by-products. The affinity adsorbent was synthesized using cellulose microfibers as the matrix, isolated from recycled newspapers using the acid precipitation method. As an affinity ligand, the triazine dye Cibacron Blue 3GA (CB3GA) was used and immobilized directly onto the cellulose microfibers. Absorption equilibrium studies and frontal affinity chromatography were employed to evaluate the chromatographic performance of the adsorbent using as model proteins bovine serum albumin (BSA) and lysozyme (LYS). Absorption equilibrium studies suggest that the adsorption of both proteins obeys the Langmuir isotherm model. The kinetics of adsorption obey the pseudo-second-order model. The affinity adsorbent was applied for the development of a purification procedure for proteases from Sparus aurata by-products (stomach and pancreas). A single-step purification protocol for trypsin and chymotrypsin was developed and optimized. The protocol afforded enzymes with high yields suitable for technical and industrial purposes.

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Section: Resultssupporting

confidence: 90%

Section: Extraction and Characterization Of Cellulose Microfibers Frosupporting

confidence: 90%

Reduce, Reuse and Recycle in Protein Chromatography: Development of an Affinity Adsorbent from Waste Paper and Its Application for the Purification of Proteases from Fish By-Products

Premetis

Labrou

2020

Biomolecules

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“…This could be due to the broadening effect in AFM, where the broadening of the sample width depends on its physical properties and position concerning the tip radius. Another crucial aspect that might affect AFM is the placement of the nanofibers on the holder that may lead to random measurements due to the irregular shape of the nanofibers [ 43 ]. Thus, the combination of acid hydrolysis and ball milling further proved that when the impurities covering the CNFs were effectively removed, a reduction from micro-sized raw cellulose, composed of bundles of fibers, into nano-sized CNFs occurs.…”

Section: Resultsmentioning

confidence: 99%

Structural, Morphological and Thermal Properties of Cellulose Nanofibers from Napier fiber (Pennisetum purpureum)

et al. 2020

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The purpose of the study is to investigate the utilisation of Napier fiber (Pennisetum purpureum) as a source for the fabrication of cellulose nanofibers (CNF). In this study, cellulose nanofibers (CNF) from Napier fiber were isolated via ball-milling assisted by acid hydrolysis. Acid hydrolysis with different molarities (1.0, 3.8 and 5.6 M) was performed efficiently facilitate cellulose fiber size reduction. The resulting CNFs were characterised through Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), particle size analyser (PSA), field-emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The FTIR results demonstrated that there were no obvious changes observed between the spectra of the CNFs with different molarities of acid hydrolysis. With 5.6 M acid hydrolysis, the XRD analysis displayed the highest degree of CNF crystallinity at 70.67%. In a thermal analysis by TGA and DTG, cellulose nanofiber with 5.6 M acid hydrolysis tended to produce cellulose nanofibers with higher thermal stability. As evidenced by the structural morphologies, a fibrous network nanostructure was obtained under TEM and AFM analysis, while a compact structure was observed under FESEM analysis. In conclusion, the isolated CNFs from Napier-derived cellulose are expected to yield potential to be used as a suitable source for nanocomposite production in various applications, including pharmaceutical, food packaging and biomedical fields.

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“…The detergent treatment was chosen based on previous studies and the efficiency of pretreatment. Other pre-treatments were investigated, as reported by Souza et al, 2017 and Souza et al, 2019 [18,19]. In this stage was used aqueous solution with 5% (v/v) of commercial neutral detergent.…”

Section: Treatment Of Raw Materialsmentioning

confidence: 99%

Variation of the milling conditions in the obtaining of nanocellulose from the paper sludge

2019

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This work aimed to evaluate three different milling conditions, seeking the optimization of CNS isolation process. The paper sludge was chemically treated with detergent and H 2 O 2, by two steps, to remove the noncellulosic contents (hemicellulose and lignin). After these treatments, the sample was milled with the variation of a liquid medium. The three liquids milling medium were: i) dry medium (CNS-D); ii) moist with water and (CNS-W) iii) moist with ethanol (CNS-E). The CNSs were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), zeta potential and dynamic light scattering (DLS). The milled samples presented different behavior, depending on the medium applied. The CNS-W presented low efficiency due to the formation of agglomerates around the ceramic ball, resulting in larger fiber sizes (microsizes). Although, the samples CNS-D and CNS-E presented similar behavior of sizes distribution, with average size 340 nm and 373 nm, respectively, determined by DLS. The CNS-E sample presented higher yield and electrostatic stability in solution, besides not presenting loss of crystallinity, as occurred with CNS-D, observed by FTIR analysis. Thus, the isolation with ethanol showed more efficient process among the three processes studied. This work achieved the isolation of CNS; besides, it proposed an environmentally friendly isolation method, and this may add value in the paper sludge.

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Cellulose Nanostructures Obtained from Waste Paper Industry: A Comparison of Acid and Mechanical Isolation Methods

Cited by 41 publications

References 24 publications

Reduce, Reuse and Recycle in Protein Chromatography: Development of an Affinity Adsorbent from Waste Paper and Its Application for the Purification of Proteases from Fish By-Products

Reduce, Reuse and Recycle in Protein Chromatography: Development of an Affinity Adsorbent from Waste Paper and Its Application for the Purification of Proteases from Fish By-Products

Structural, Morphological and Thermal Properties of Cellulose Nanofibers from Napier fiber (Pennisetum purpureum)

Variation of the milling conditions in the obtaining of nanocellulose from the paper sludge

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