Tailoring the Chemical Structure of Cellulose Nanocrystals by Amine Functionalization

D’Orsi, Rosarita; Canale, Viviana Claudia; Cancelliere, Rocco; Omar, Omar Hassan; Meisina, Claudia; Micheli, Laura; Operamolla, Alessandra

doi:10.1002/ejoc.202201457

Cited by 6 publications

(2 citation statements)

References 40 publications

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“…After 1 h of stirring in the dark, the solution was centrifuged at 1000 rpm for 10 min to remove the unreacted fluorophore. The FTIR spectrum of lyophilized PVAMBs, reported in Figure S8 [45,46], allowed an assessment of the presence of a PVA-based shell in the PVAMBs, as the characteristic bands of PVA at 1141 and 1090 cm −1 due to the C-O stretching modes of the polymer in the crystalline and amorphous parts were present [47]. With respect to the spectrum of fully hydrolyzed PVA, the FTIR profile of PVAMBs shows a decrease in the 1140 cm −1 /1095 cm −1 band intensity ratio, suggesting a decrease in crystallinity as expected due the PVAMBs shell formulation process (i.e., polymer solubilization, oxidation and reticulation at the air/water interface; see above).…”

Section: Pvambs Synthesis and Characterizationmentioning

confidence: 99%

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Ultrasound-Stimulated PVA Microbubbles as a Green and Handy Tool for the Cleaning of Cellulose-Based Materials

Severini

D’Andrea

Redi

et al. 2023

Gels

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One of the main issues in the cultural heritage field of restoration chemistry is the identification of greener and more effective methods for the wet cleaning of paper artefacts, which serve as witnesses to human history and custodians of cultural values. In this context, we propose a biocompatible method to perform wet cleaning on paper based on the use of 1 MHz ultrasound in combination with water-dispersed polyvinyl alcohol microbubbles (PVAMBs), followed by dabbing with PVA-based hydrogel. This method can be applied to both old and new papers. FTIR spectroscopy, X-ray diffraction, HPLC analysis, pH measurements and tensile tests were performed on paper samples, to assess the efficacy of the cleaning system. According to the results, ultrasound-activated PVAMB application allows for an efficient interaction with rough and porous cellulose paper profiles, promoting the removal of cellulose degradation byproducts, while the following hydrogel dabbing treatment guarantees the removal of cleaning materials residues. Moreover, the results also pointed out that after the treatment no thermal or mechanical damages had affected the paper. In conclusion, the readability of these kinds of artifacts can be improved without causing an alteration of their structural properties, while mitigating the risk of ink diffusion.

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Section: Pvambs Synthesis and Characterizationmentioning

confidence: 99%

“…pH and colorimetric values obtained on Whatman paper before and after different cleaning approaches. [3,5,39,40,43,45,46,49].…”

Section: Supplementary Materialsmentioning

confidence: 99%

Ultrasound-Stimulated PVA Microbubbles as a Green and Handy Tool for the Cleaning of Cellulose-Based Materials

Severini

D’Andrea

Redi

et al. 2023

Gels

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Covalent Lysozyme Immobilization on Enzymatic Cellulose Nanocrystals

Spagnuolo,

Micheli,

Dufresne

et al. 2024

Chemistry A European J

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Nanostructured materials represent promising substrates for biocatalysts immobilization and activation. Cellulose nanocrystals (CNCs), accessible from waste and/or renewable sources, are sustainable and biodegradable, show high specific surface area for anchoring a high number of enzymatic units, and high thermal and mechanical stability. In this work, we present a holistic enzyme‐based approach to functional antibacterial materials by bioconjugation between the lysozyme from chicken egg white and enzymatic cellulose nanocrystals. The neutral CNCs were prepared by endoglucanase hydrolysis from Avicel. We explore the covalent immobilization of lysozyme on the enzymatic CNCs and on their TEMPO oxidized derivatives (TO‐CNCs), comparing immobilization yields, materials properties, and enzymatic activities. The materials were characterized by X‐ray diffractometry (XRD), attenuated total reflectance Fourier Transform infrared spectroscopy (ATR‐FTIR), bicinchoninic acid (BCA) assay, field‐emission scanning electron microscopy (FE‐SEM) and dynamic light scattering (DLS). We demonstrate the higher overall efficiency of the immobilization process carried out on TO‐CNCs, based on the success of covalent bonding and on the stability of the isolated biocojugates.

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High Yield Synthesis of Cellulose Nanocrystals From Avicel by Mechano‐Enzymatic Approach

Spagnuolo,

Beneventi,

Dufresne

et al. 2024

ChemistrySelect

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Cellulose nanocrystals are an important class of bio‐based crystalline nanostructures, finding application in several technological fields, including paper and textile coating, biocomposite engineering, biocatalysts immobilization, etc. This study explores enzymatic hydrolysis of Avicel, using endoglucanase from Aspergillus niger, to find an environmentally friendly method to extract cellulose nanocrystals from cellulose sources. Enzymatic hydrolysis has the advantage of reduced energy consumption and higher environmental friendliness compared to acid hydrolysis. In this work, we report for the first time very high nanocrystals yield by combining mechanical pretreatment of the cellulose starting material with a ball miller and endoglucanase hydrolysis, as a result of an extensive optimization of reaction conditions. In particular, a ball milling pretreatment carried out for 50 minutes at 3 Hz, allowed to isolate enzymatic CNCs with 76 % yield and with crystallinity as high as 75 %. The materials were characterized by X‐Ray diffractometry, attenuated total reflectance Fourier transform infrared (ATR‐FTIR) spectroscopy, dynamic light scattering, zeta potential and field emission scanning electron microscopy (FE‐SEM). Their characteristics were compared with the properties of sulfated CNCs, prepared from Avicel by sulfuric acid hydrolysis. Our results are technologically relevant, as they contribute to the accessibility and sustainability of CNCs for a wide range of applications in various industries.

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Tailoring the Chemical Structure of Cellulose Nanocrystals by Amine Functionalization

Cited by 6 publications

References 40 publications

Ultrasound-Stimulated PVA Microbubbles as a Green and Handy Tool for the Cleaning of Cellulose-Based Materials

Ultrasound-Stimulated PVA Microbubbles as a Green and Handy Tool for the Cleaning of Cellulose-Based Materials

Covalent Lysozyme Immobilization on Enzymatic Cellulose Nanocrystals

High Yield Synthesis of Cellulose Nanocrystals From Avicel by Mechano‐Enzymatic Approach

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