TEMPO oxidation and high-speed blending as a combined approach to disassemble bacterial cellulose

Nascimento, Elígenes Sampaio do; Pereira, André Luís Sousa; Barros, Matheus de Oliveira; Barroso, Maria Karolina de Aaraújo; Lima, Helder Levi Silva; Borges, M. de F.; Feitosa, Judith Pessoa de Andrade; Azeredo, Henriette Monteiro Cordeiro de; Rosa, Morsyleide de Freitas

doi:10.1007/s10570-018-2208-2

Cited by 33 publications

(8 citation statements)

References 60 publications

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“…These metylated increased the degradation temperature from 273 to 313 o C. In this study, maximum degradation showed at 309.2 and 383.1 o C, while the char residue at 600 o C, the amidated TCNF resulted in lower residue. This result are in conjunction with the thermal stability study of oxidized bacterial cellulose compared to unmodified counterpart [20].…”

Section: Thermogravimetry Analysissupporting

confidence: 70%

Surface Modification of Tempo-Mediated Cellulose Nanofibril With Octadecylamine

Masruchin

Nuryawan

Kusumaningrum

et al. 2019

jsmi

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SURFACE MODIFICATION OF TEMPO-MEDIATED CELLULOSE NANOFIBRIL WITH OCTADECYLAMINE. In this study, surface modification of 2,2,6,6-tetramethylpiperidine-1-oxyl radical TEMPO-cellulose nanofibrils (TCNF) was obtained by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS)-mediated system. The carboxylate groups on TCNF surface was replaced by conjugation of octadecylamine (ODA). The conversion of the carboxylate groups on CNF into amide I and II groups was confirmed by attenuated transform reflectance-infrared (ATR-FTIR) and elemental analysis study. Further, decarboxylation of TCNF at higher temperature was hindered by the presence of amide groups resulted in the higher thermal stability of TCNF as observed by thermogravimetry analysis (TGA). These results suggested the possibility of modifying surface negatively charged of TCNF with conjugated amine groups into thermally stable nanocellulose.

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Section: Thermogravimetry Analysissupporting

confidence: 70%

Surface Modification of Tempo-Mediated Cellulose Nanofibril With Octadecylamine

Masruchin

Nuryawan

Kusumaningrum

et al. 2019

jsmi

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“…Since BC is produced by bacteria as a membrane, it needs to be disintegrated in order to be used in a powder (or suspension) form for further formulations, as for most food applications [ 13 ]. However, the redispersion of powdered BC in water is impaired by hornification (the irreversible aggregation of cellulose chains upon drying) [ 14 ]. The problem is usually dealt with either by chemically modifying BC by introducing electrically charged groups (e.g., carboxyl groups inserted by oxidation) [ 14 ], or by combining BC to an electrically charged polymer such as carboxymethyl cellulose (CMC), thus promoting electrostatic repulsion and water dispersibility [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Bacterial Cellulose/Tomato Puree Edible Films as Moisture Barrier Structures in Multicomponent Foods

Freitas

Mendonça

Santos

et al. 2022

Foods

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Edible films have been studied mainly as primary packaging materials, but they may be used as barrier layers between food components, e.g., by reducing the moisture migration between components with contrasting water activities. Since edible films are part of the food itself, components adding sensory appeal (e.g., fruit purees) are usually desirable. The objective of this study was to develop a film to be applied as a moisture barrier between nachos and guacamole. Ten film formulations were prepared according to a simplex centroid design with three components—a polysaccharide matrix (consisting of a 5:1 mixture of bacterial cellulose—BC—and carboxymethyl cellulose), tomato puree (for sensory appeal), and palm olein (to reduce hydrophilicity)—and produced by bench casting. The film with the highest palm olein content (20%) presented the lowest water vapor permeability, and its formulation was used to produce a film by continuous casting. The film was applied as a layer between nachos and guacamole, and presented to 80 panelists. The film-containing snack was preferred and considered as crispier when compared to the snack without the film, suggesting that the film was effective in reducing the moisture migration from the moist guacamole to the crispy nachos.

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“…This process converts hydroxyl groups linked to a primary carbon (C6) to aldehyde groups and then carboxylate without affecting the hydroxyl groups on C2 and C3. 46 The gradual oxidation of the C6−OH on BC enhanced its hydrophilicity, and consequently, fibers began to dissolve. As the reaction time increased, the cellulose molecules were oxidized on the crystalline microfibrils and disordered regions.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…BC gels were produced by the bacterial Komagataeibacter xylinus in a culture vessel at the air–liquid interface, followed by oxidation with TEMPO under mild aqueous conditions. This process converts hydroxyl groups linked to a primary carbon (C6) to aldehyde groups and then carboxylate without affecting the hydroxyl groups on C2 and C3 . The gradual oxidation of the C6–OH on BC enhanced its hydrophilicity, and consequently, fibers began to dissolve.…”

Section: Resultsmentioning

confidence: 99%

TEMPO-Mediated Oxidation Promotes Cellulose Dissolution in a Zincate–NaOH System at Suprazero Temperatures

Wang

Sun

et al. 2022

ACS Sustainable Chem. Eng.

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The cellulose dissolution is conducive to converting it into higher value-added cellulose products. However, conventional cellulose solvents possess several drawbacks, such as high cost and harsh reaction conditions. In this study, a new strategy that combined 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation and a zincate−NaOH system was proposed for cellulose solubilization. The results showed that TEMPO-mediated oxidation increased the hydrophilicity of cellulose, destroyed the surface and amorphous areas of the fiber, and facilitated solvent access to its crystalline regions in the subsequent treatment. Zn(OH) 4 2− can be used as a stabilizer to prevent cellulose from agglomeration and form strong hydrogen bonds with cellulose to enhance cellulose dissolution. All-cellulose composites with antibacterial properties were prepared from cellulose using a partial dissolution method at room temperature. This preparation is simple and low cost, laying the foundation for its application in biomedicine.

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TEMPO oxidation and high-speed blending as a combined approach to disassemble bacterial cellulose

Cited by 33 publications

References 60 publications

Surface Modification of Tempo-Mediated Cellulose Nanofibril With Octadecylamine

Surface Modification of Tempo-Mediated Cellulose Nanofibril With Octadecylamine

Bacterial Cellulose/Tomato Puree Edible Films as Moisture Barrier Structures in Multicomponent Foods

TEMPO-Mediated Oxidation Promotes Cellulose Dissolution in a Zincate–NaOH System at Suprazero Temperatures

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