NaOH treatment of chitosan films: Impact on macromolecular structure and film properties

Takara, Eduardo A.; Marchese, José Abramo; Ochoa, Nelio Ariel

doi:10.1016/j.carbpol.2015.05.077

Cited by 86 publications

(62 citation statements)

References 55 publications

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“…Chitosan powder exhibited 2 well‐defined peaks centered at 10.6°and 20.2°. This agrees with previous findings of Xu et al and Takara et al After making the film, the peak at 10.6° was no longer observed; instead, a new peak appeared at 8.1°. The peak at 20.2° broadened markedly, and the broadening indicates that the chitosan transitions to a highly amorphous state during the film preparation.…”

Section: Resultssupporting

confidence: 93%

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Chitosan nanocomposite films incorporating cellulose nanocrystals and grape pomace extracts

Willis

Jordan

et al. 2018

Packag Technol Sci

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Chitosan nanocomposite films incorporating grape pomace extract (GPE), either Cabernet Franc (CF; a red variety) or Viognier (a white variety), and cellulose nanocrystal (CNC) were prepared using a solvent casting method. Mechanical properties, water vapour permeability, color and opacity, crystalline structure, thermal properties, total phenolic content, and antioxidant activity of the films were characterized. Incorporating CNC alone significantly (P < .05) increased tensile strength of the films and decreased their percent elongation at break and water vapour permeability. Grape pomace extract had an opposite effect on mechanical properties by decreasing tensile strength but increasing percent elongation at break. Film color was mainly influenced by the presence and type of GPE. Films containing CF extract exhibited the darkest appearance with increased reddish and bluish hues. Addition of CNC significantly increased film opacity and the alignment of chitosan chains, while the effect of GPE was not significant. Thermal analysis showed that chitosan and CNC were partially miscible and that the addition of CNC did not significantly change decomposition temperature of the films. Incorporation of GPE significantly (P < .05) increase total phenolic content and antioxidant activity. Films containing CF had higher DPPH• radical scavenging capacity than their counterparts with Viognier. Film incorporating both CNC and CF shows greater potential for food packaging application because of a combination of improved physical properties and high antioxidant activity.

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Section: Resultssupporting

confidence: 93%

“…Cellulose nanocrystal exhibited 3 characteristic peaks at 2θ=17°(plane 110), 21°(plane 102), 22.5°(plane 200), and 34°(plane 004), which corresponded to typical crystalline cellulose I structure. 43 Chitosan powder exhibited 2 well-defined peaks centered at 10.6°and 20.2°.This agrees with previous findings of Xu et al39 and Takara et al44…”

supporting

confidence: 87%

Chitosan nanocomposite films incorporating cellulose nanocrystals and grape pomace extracts

Willis

Jordan

et al. 2018

Packag Technol Sci

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“…The effect of C NaOH is negligible, at least when hydrogels from CS solutions at C CS > C* are considered. Such a finding is in line with recent results by Takara et al on the Young's modulus of CS films . It can be argued that the network structure above the overlap concentration is stable enough not to be appreciably altered by the rate of pH‐induced gelation.…”

Section: Resultssupporting

confidence: 91%

Role of polymer network and gelation kinetics on the mechanical properties and adsorption capacity of chitosan hydrogels for dye removal

Luna

Altobelli

Gioiella

et al. 2017

J Polym Sci B Polym Phys

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Chitosan (CS) hydrogels are receiving growing attention as adsorbents for water purification purposes. The conditions of preparation of this class of materials play a crucial in the determination of their performances; however, this aspect is often neglected in the literature. In this study, we deal with this issue, focusing on the structure-property relationships of CS hydrogels obtained by phase inversion method. We show that the concentration of the starting solution determines the density and strength of intermolecular interactions, and that the gelation kinetics dictates the hydrogel structure at the microscale. Consequently, even subtle changes in the preparation protocol can cause significant differences in the performances of CS hydrogels in terms of mechanical properties and dye adsorption capacity. The observed trends are often neither trivial nor monotonic. Nonetheless, we demonstrate that they can be interpreted looking at the CS network structure, which can be inferred by rheological measurements

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“…The FTIR spectra of chitosan and chitosan/iron nanocomposites are shown in Figure 8. The dominant bands appearing in the neat chitosan are due to the vibrations of functional groups such as symmetrical stretching vibrations of N-H at 3356 cm -1 , stretching of Journal of Nanomaterials -OH bonds corresponding to the strong and broadband centered at 3288 cm -1 [5], asymmetric stretching vibrations of C-H bonds at 2920 cm -1 , and stretching of C-H at 2874 cm -1 . Furthermore, vibrations of carbonyl bonds of the secondary amide group at 1647 cm -1 , C=O vibrations in the protonated amine group at 1566 cm -1 , CH bending of methylene at 1420 cm -1 , and a methyl group at 1377 cm -1 also indicate the characteristic peaks of chitosan.…”

Section: Chemicalmentioning

confidence: 99%

“…It is the linear polymer of β-(1-4)-2-acetamido-2-deoxy-D-glucopyranose synthesized by deacetylation of chitin, the second most abundant polysaccharide in nature. Chitin is extracted by the exoskeleton of crustaceans such as shrimps and crab shells [5][6][7]. Chitosan exhibits superior properties such as nontoxicity, biodegradability, biocompatibility, antiviral, and antimicrobial properties [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly, Green Packaging Materials from Akaganeite and Hematite Nanoparticle-Reinforced Chitosan Nanocomposite Films

Chandrakumara

Dissanayake

Mantilaka

et al. 2019

Journal of Nanomaterials

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In this study, chitosan nanocomposite thin films were successfully fabricated by incorporating hematite nanoparticles (HNPs) and akaganeite nanoparticles (ANPs) as reinforcing fillers using the solution casting method. HNPs and ANPs were synthesized via a urea-assisted synthesis route using naturally occurring ferruginous laterites. Scanning electron microscopic (SEM) images indicated the spherical to subhexagonal morphology of the HNPs and rice-like morphology of the ANPs. X-ray diffractograms indicate the crystalline structure of iron oxides as hematite and akaganeite. Tensile tests were carried out to evaluate the mechanical properties of the nanocomposite films where maximum tensile stress of the chitosan/HNP composites was improved as high as 35.7% while chitosan/ANP composites indicated 43.5%. Thermal decomposition curves obtained by thermogravimetric analysis (TGA) indicate that the thermal stability of the nanocomposites has improved remarkably compared to neat chitosan films. Furthermore, these nanocomposites exhibited excellent UV barrier properties as identified by UV-visible spectrometry. Fourier-transform infrared (FTIR) spectroscopic results are evident in the presence of Fe-O bond in the wavenumber around 480-500 cm -1 , and the result also indicated that the nanofillers interact with the chitosan matrix via hydrogen bonding, which enhanced the physical properties of the nanocomposites. Incorporation of iron oxide nanoparticle varieties into chitosan has led to improvements of certain physical and chemical properties, which make chitosan a promising material for packaging applications.

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NaOH treatment of chitosan films: Impact on macromolecular structure and film properties

Cited by 86 publications

References 55 publications

Chitosan nanocomposite films incorporating cellulose nanocrystals and grape pomace extracts

Chitosan nanocomposite films incorporating cellulose nanocrystals and grape pomace extracts

Role of polymer network and gelation kinetics on the mechanical properties and adsorption capacity of chitosan hydrogels for dye removal

Eco-Friendly, Green Packaging Materials from Akaganeite and Hematite Nanoparticle-Reinforced Chitosan Nanocomposite Films

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