Synthesis and properties of cellulose  nanocrystal conjugates with reactive dyes

Суров, О. В.; Воронова, М. И.; Захаров, А. Г.

doi:10.1007/s10570-021-03898-4

Cited by 9 publications

(7 citation statements)

References 56 publications

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“…13 C solid-state NMR spectra were acquired to further explain the chemical modification of CNCs. As shown in Figure a,b, both spectra display the typical peaks of cellulose in the range of 110–60 ppm, which were assigned to the carbons in anhydroglucose units . In detail, the signals at 110–100 ppm were attributed to C-1, and the features between 68 and 80 ppm were assigned to C-2, C-3, and C-5 collectively.…”

Section: Resultsmentioning

confidence: 87%

“…As shown in Figure 2a,b, both spectra display the typical peaks of cellulose in the range of 110−60 ppm, which were assigned to the carbons in anhydroglucose units. 28 In detail, the signals at 110−100 ppm were attributed to C-1, and the features between 68 and 80 ppm were assigned to C-2, C-3, and C-5 collectively. The peaks centered at 91−80 ppm were assigned to C-4, representing the β-(1-4) linkage.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

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Modification of Cellulose Nanocrystals as Antibacterial Nanofillers to Fabricate Rechargeable Nanocomposite Films for Active Packaging

Huang

et al. 2022

ACS Sustainable Chem. Eng.

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Growing food safety concerns have required the development of functional films incorporated with antibacterial nanofillers for active packaging, and cellulose nanocrystals (CNCs) are promising candidates due to their unique morphology and availability for modification. Herein, this study aims to develop an approach to producing functional CNCs that can be easily incorporated into commercial plastic films as antibacterial nanofillers for active packaging. Particularly, CNCs extracted from cotton textile waste were selected as a model and modified with methacrylamide (MAM). Cellulose acetate (CA) and poly(vinyl chloride) (PVC) were chosen as film-forming agents, and the modified CNCs (MAM-CNCs) were incorporated by the solution casting method. Addition of MAM-CNCs significantly improved the mechanical and UV barrier properties of CA and PVC films. After chlorination, the composite films with 3% MAM-CNCs exhibited excellent antibacterial efficacy against common foodborne pathogens, e.g., higher than 6 log reduction of Staphylococcus aureus and Escherichia coli after 1 h of contact at 37 °C. Moreover, this antibacterial capacity could be recharged by chlorination without affecting the mechanical performance of plastic films. Therefore, this work reveals the potential of utilizing modified CNCs to fabricate functional packaging materials.

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Section: Resultsmentioning

confidence: 87%

Section: ■ Results and Discussionmentioning

confidence: 98%

Modification of Cellulose Nanocrystals as Antibacterial Nanofillers to Fabricate Rechargeable Nanocomposite Films for Active Packaging

Huang

et al. 2022

ACS Sustainable Chem. Eng.

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“…To stabilize such a system, the use of emulsifiers is required, which can be surfactants (classical emulsions) or solid particles (Pickering emulsions). Unlike classical emulsions, Pickering emulsions are more stable to coalescence and can be stabilized with edible or less toxic solids such as those from natural proteins and polysaccharides, − inorganic particles, and hybrid organic–inorganic systems. , Another advantage of Pickering emulsions is the ability in some cases to maintain or completely restore the emulsion state after partial removal of the continuous phase . Due to their excellent properties, Pickering emulsions are currently used in pharmaceutical engineering, food processing, drug delivery, cosmetics, agriculture, oil production, and material synthesis. , …”

Section: Introductionmentioning

confidence: 99%

Anti-Alzheimer Drug Delivery via Pickering Emulsions Stabilized by Plate-like Cellulose Nanocrystals

Mikhaylov,

Torlopov,

Vaseneva

et al. 2023

Langmuir

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In this work, we studied for the first time the formation of olive oil emulsions in water stabilized by plate-like nanocrystals with the supramolecular structure of cellulose II (pCNC). Effects of storage, pCNC concentration, and NaCl on the stability and properties of Pickering emulsions, including the creaming index, droplet size, zeta potential, acid−base surface properties, and rheology, were studied. A significant influence of the shape of nanoparticles (compared to the classical rod-like shape) on the stability parameters and rheological characteristics of emulsions is shown. Plate-like cellulose nanocrystals at a concentration of 16 g/L are able to form delamination-resistant emulsions without added electrolytes. The viscosity of pCNC-stabilized emulsions tends to decrease with increasing electrolyte concentration in the system, which is not characteristic of rod-like CNC-stabilized emulsions. This effect in pCNC-stabilized emulsions assumedly can be associated both with weak mechanical engagement between drops due to the shape of stabilizer particles and with an insignificant participation of background electrolyte cations in the formation of interdroplet interactions. Therefore, the resulting aggregates are unstable and easily destroyed, even under weak mechanical stress. As a consequence, the acid−base properties of the pCNC surface are practically independent of the emulsion preparation method (with or without electrolyte) as well as the concentration of the background electrolyte. The reduced viscosity of pCNC-stabilized emulsions in the presence of an electrolyte, coupled with the absence of acute toxicity, allows us to recommend them as a convenient oral delivery system for fatsoluble, biologically active substances. Our emulsions carrying donepezil (an anti-Alzheimer drug) showed better performance than a solution of donepezil hydrochloride in preventing memory impairment tested on laboratory mice.

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“…15,16 According to the reactive mechanisms, the modifications of the reducing end of CNCs can be classified into three strategies, namely, covalent linkage to amino compounds at the reducing end of nanocrystals based on aldimine condensation; chemical reaction between diketone and nanocrystals based on Knoevenagel condensation; and covalent bonding of amino compounds at the oxidized reducing end of nanocrystals (transforming aldehyde to carboxyl) based on carboxyamine condensation. 17 studies have reported the modification of the reducing end of CNCs with the combination of fluorescent molecules, 18,19 polymer chains, 20−26 and biomolecules. 27−30 In contrast to the many strategies developed for hydroxyl group-based surface modification, the modification of the reducing end of CNCs still demands in-depth study.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Preliminary studies have identified the existence of nonreducing and reducing ends of the cellulose chain with different structures and properties. − Active aldehyde groups at the reducing end of cellulose chains offer a new concept and design for the modification of CNCs, stemming from a regioselective reaction at different locations of this rod-like nanoparticle compared to surface modification on hydroxyl groups. , According to the reactive mechanisms, the modifications of the reducing end of CNCs can be classified into three strategies, namely, covalent linkage to amino compounds at the reducing end of nanocrystals based on aldimine condensation; chemical reaction between diketone and nanocrystals based on Knoevenagel condensation; and covalent bonding of amino compounds at the oxidized reducing end of nanocrystals (transforming aldehyde to carboxyl) based on carboxyamine condensation . Several studies have reported the modification of the reducing end of CNCs with the combination of fluorescent molecules, , polymer chains, − and biomolecules. − …”

Section: Introductionmentioning

confidence: 99%

Regioselective Modification at Reducing End Aldehydes of Cellulose Nanocrystals and Mercerization

Tan

Dufresne

Zhu

et al. 2023

ACS Sustainable Chem. Eng.

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Receiving considerable interest in recent years, the reducing ends of cellulose nanocrystals (CNCs) with heterogeneous groups and different reactivity from surface chemistry contribute to the development of new strategies for regioselective modification and performance tailoring for this building block of natural biomass. However, the understanding of the phenomena involved at the reducing end is still at the research stage for cellulose chains, usually in dissolved form in a solvent, but lacks extensive investigation for nanocrystals, existing in the form of suspensions. Two issues are explored in this study. The first one concerns the comprehensive analysis of various conditions and parameters for the introduction of aldehyde groups at the reducing end of CNCs. The second investigates the influence of end-modified species on the crystalline reconfiguration of nanocrystals during mercerization. Quantitative measurements of the content of reducing end aldehyde groups are carried out for nine nanocellulose samples, offering scientific evidence to obtain more aldehyde groups available at the reducing end of CNCs for future studies. Furthermore, four species of CNCs with various chemical structures and macroscopic properties are modified at the reducing ends, and their reorganization as type-II nanocrystals during mercerization is investigated. The results indicate a critical effect of the steric hindrance of end species on the crystalline reconfiguration of nanocrystals, providing inspiration for a possible molecular structure and asymmetric modification for this ageless nanomaterial.

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Synthesis and properties of cellulose nanocrystal conjugates with reactive dyes

Cited by 9 publications

References 56 publications

Modification of Cellulose Nanocrystals as Antibacterial Nanofillers to Fabricate Rechargeable Nanocomposite Films for Active Packaging

Modification of Cellulose Nanocrystals as Antibacterial Nanofillers to Fabricate Rechargeable Nanocomposite Films for Active Packaging

Anti-Alzheimer Drug Delivery via Pickering Emulsions Stabilized by Plate-like Cellulose Nanocrystals

Regioselective Modification at Reducing End Aldehydes of Cellulose Nanocrystals and Mercerization

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