The Effect of Chitin Alkaline Deacetylation at Different Condition on Particle Properties

Pires, Cléo T. G. V. M. T.; Vilela, Joice Aline Pires; Airoldi, Cláudio

doi:10.1016/j.proche.2014.05.026

Cited by 41 publications

(26 citation statements)

References 30 publications

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“…[25][26][27][28] This affords chitosan with good DDAs and medium sized molecular weights between 80 to 800kDa. Other methods have been explored in an effort to produce a greener and safer process: maceration, 29 steam explosion, 30 freeze-thaw cycles, 31 high temperature and pressure, 32,33 sonication, 29 microwaving, 34 and planetary milling. 35 These methods typically afford DDA in the 70 to high 90% values.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of high molecular weight chitosan from chitin by mechanochemistry and aging

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Synthesis of high molecular weight chitosan from chitin by mechanochemistry and aging

et al. 2019

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“…Chitosan-oligosaccharides have some physiological activities, including antimicrobial activities [2][3][4], immuno-enhancing effects [5], and anti-tumour activities [6]. COS can be produced by the hydrolysis of chitosan using chemical methods or enzymatic catalysis [7,8]. In comparison with chemical methods, enzyme catalysis is more environmentally friendly and efficient [9].…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Chitosanases onto Magnetic Nanoparticles to Enhance Enzyme Performance

et al. 2018

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In this study, chitosanase cloning from Streptomyces albolongus was fermented and purified by a Ni-NTA column. Fe3O4-SiO2 magnetite nanoparticles (MNPs) were synthesized by the co-precipitation method coating with silica via a sol-gel reaction and were then amino functioned by treating with 3-aminopropyltriethoxysilane. Chitosanases were immobilized onto the surface of MNPs by covalent bonding (MNPs@chitosanase). Transmission electron microscopy (TEM), Fourier transform infrared spectrometer (FT–IR), and magnetic measurements were used to illustrate the MNPs and immobilized chitosanase. The optimal conditions of immobilization were studied. The thermal, pH, and stabilities of immobilized chitosanase were tested and the results showed that the stabilities were significantly enhanced compared with free chitosanase. After being recycled 10 times, the residual activity of the immobilized chitosanase was 43.7% of the initial activity.

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“…Chitosan (CHT) is an abundant marine biopolymer derived from the hydrolysis of chitin [22]. Alkaline hydrolysis of chitin yields chitosan [23] with variable deacetylation, where typical commercial CHT samples have deacetylation levels that range from 70% to 95% [24]. The abundant functional groups (-NH 2 and -OH) of CHT are amenable for modification ( Figure 1) by physical and chemical means.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Multicomponent Biocomposites and Characterization of Their Physicochemical and Mechanical Properties

2020

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This work focused on a mutual comparison and characterization of the physicochemical properties of three-component polymer composites. Binary polyaniline–chitosan (PANI–CHT) composites were synthesized by in situ polymerization of PANI onto CHT. Ternary composites were prepared by blending with a third component, polyvinyl alcohol (PVA). Composites with variable PANI:CHT (25:75, 50:50 and 75:25) weight ratios were prepared whilst fixing the composition of PVA. The structure and physicochemical properties of the composites were evaluated using thermal analysis (thermogravimetric analysis (TGA), differential scanning calorimetry (DSC)) and spectroscopic methods (infrared (IR), nuclear magnetic resonance (NMR)). The equilibrium and dynamic adsorption properties of composites were evaluated by solvent swelling in water, water vapour adsorption and dye adsorption isotherms. The electrical conductivity was estimated using current–voltage curves. The mechanical properties of the samples were evaluated using dynamic mechanical analysis (DMA) and correlated with the structural parameters of the composites. The adsorption and swelling properties paralleled the change in the electrical and mechanical properties of the materials. In most cases, samples with higher content of chitosan exhibit higher adsorption and mechanical properties, and lower conductivity. Acid-doped samples showed much higher adsorption, swelling, and electrical conductivity than their undoped analogues.

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The Effect of Chitin Alkaline Deacetylation at Different Condition on Particle Properties

Cited by 41 publications

References 30 publications

Synthesis of high molecular weight chitosan from chitin by mechanochemistry and aging

Synthesis of high molecular weight chitosan from chitin by mechanochemistry and aging

Immobilization of Chitosanases onto Magnetic Nanoparticles to Enhance Enzyme Performance

Preparation of Multicomponent Biocomposites and Characterization of Their Physicochemical and Mechanical Properties

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