Applications and Properties of Chitosan

Li, Q.; Dunn, E. T.; Grandmaison, E. W.; Goosen, Mattheus F. A.

doi:10.1201/9781003072812-2

Cited by 55 publications

(35 citation statements)

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“…Among the biodegradable polymers, chitosan has been widely used to produce edible films because it is nontoxic and biodegradable. It also has an excellent film-forming ability, a broad antimicrobial activity, selective permeability to gases (CO 2 and O 2 ), and is compatible with other substances, such as vitamins, minerals, and antimicrobial agents [ 6 , 7 , 8 , 9 , 10 , 11 ]. Unfortunately, chitosan coatings and films have poor water vapor barrier properties due to their hydrophilic nature [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Homogenization Method and Carvacrol Content on Microstructural and Physical Properties of Chitosan-Based Films

Flores

San-Martin

Beldarraín-Iznaga

et al. 2021

Foods

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The use of EOs nanoemulsion to develop active edible films offers a new way to modify transport properties and to release active compounds while improving mechanical resistance, transparency, and antioxidant and antimicrobial activity. The aim of this study was to study the influence of homogenization conditions and carvacrol content on the microstructure and physical properties of edible nanoemulsified chitosan films. Film-forming emulsions (FFE) were prepared with chitosan (1.5%), Tween 80 (0.5%), and carvacrol (0.25%, 0.5%, and 1.0%); two homogenization methods were used (rotor-stator and rotor-stator followed by high-pressure homogenization). Film internal and surface microstructure was characterized by scanning electron microscopy (SEM) and film physical properties, such as mechanical, optical, and water barrier, were evaluated. Results showed that the high-pressure homogenization method promoted a significant change on film microstructure, leading to improved properties. Carvacrol droplets were smaller and homogeneously distributed in the film when 0.5% (v/v) carvacrol was incorporated (1:1 Tween 80: carvacrol ratio). As a consequence, emulsified films obtained at high pressure were less opaque, had greater elongation, and had a lower permeability to water vapor than those obtained by the rotor-stator method. Therefore, high-pressure homogenization is a good method to obtain edible emulsified films with desirable properties for food preservation.

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Section: Introductionmentioning

confidence: 99%

Effect of Homogenization Method and Carvacrol Content on Microstructural and Physical Properties of Chitosan-Based Films

Flores

San-Martin

Beldarraín-Iznaga

et al. 2021

Foods

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“…The most used technique for the synthesis of flat chitosan films is the solvent evaporation or solution-cast method [ 36 , 37 , 38 , 39 ] because its simplicity ( Figure 2 ). The technique is based on the drying of a slightly acidic chitosan solution spread on a rigid support (Petri dishes, glass or plastic plates) at low or medium temperatures.…”

Section: An Overview Of Chitosan Properties and Methods Of Synthesmentioning

confidence: 99%

“…Recently, Sacco and co-workers developed an experimental setup for the fabrication of ionic chitosan gels harnessing a controlled diffusion of tripolyphosphate (TPP)—used as multivalent anion—from an outer incubation medium toward a confined polymer solution ( Figure 11 ) [ 13 , 36 ]. More in detail, chitosan is acid solubilized to protonate all glucosamine units, cast into a mold, closed by two dialysis membranes, and fixed by double circular stainless iron rings.…”

Section: Ionotropic Gelation Of Chitosan Flat Structuresmentioning

confidence: 99%

Ionotropic Gelation of Chitosan Flat Structures and Potential Applications

et al. 2021

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The capability of some polymers, such as chitosan, to form low cost gels under mild conditions is of great application interest. Ionotropic gelation of chitosan has been used predominantly for the preparation of gel beads for biomedical application. Only in the last few years has the use of this method been extended to the fabrication of chitosan-based flat structures. Herein, after an initial analysis of the major applications of chitosan flat membranes and films and their usual methods of synthesis, the process of ionotropic gelation of chitosan and some recently proposed novel procedures for the synthesis of flat structures are presented.

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“…The research and development of new types of nanocomposites is the result of the demand for materials better adapted to developed technologies. The composites based on biopolymers such as chitosan (CS) become important with particular attention paid to its biological properties [ 11 ] and applications in medicine [ 12 ], food industry [ 13 ], and agriculture [ 14 , 15 , 16 , 17 , 18 ]. These capabilities are directly related to the presence of amine functional groups [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Small AgNP in the Biopolymer Nanocomposite System

Zienkiewicz-Strzałka

Deryło–Marczewska

2020

IJMS

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In this work, ultra-small and stable silver nanoparticles (AgNP) on chitosan biopolymer (BP/AgP) were prepared by in situ reduction of the diamminesilver(I) complex ([Ag(NH3)2]+) to create a biostatic membrane system. The small AgNP (3 nm) as a stable source of silver ions, their crystal form, and homogeneous distribution in the whole solid membrane were confirmed by transmission electron microscopy (TEM), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The X-ray photoelectron spectroscopy (XPS) and Auger analysis were applied to investigate the elemental composition, concentration, and chemical state of surface atoms. It was found that ultra-small metallic nanoparticles might form a steady source of silver ions and enhance the biostatic properties of solid membranes. Ultra-small AgNP with disturbed electronic structure and plasmonic properties may generate interaction between amine groups of the biopolymer for improving the homogeneity of the nanometallic layer. In this work, the significant differences between the typical way (deposition of ex-situ-prepared AgNP) and the proposed in-situ synthesis approach were determined. The improved thermal stability (by thermogravimetry and differential scanning calorimetry (TG/DSC) analysis) for BP/AgP was observed and explained by the presence of the protective layer of a low-molecular silver phase. Finally, the antibacterial activity of the BP/AgP nanocomposite was tested using selected bacteria biofilms. The grafted membrane showed clear inhibition properties by destruction and multiple damages of bacteria cells. The possible mechanisms of biocidal activity were discussed, and the investigation of the AgNP influence on the bacteria body was illustrated by AFM measurements. The results obtained concluded that the biopolymer membrane properties were significantly improved by the integration with ultra-small Ag nanoparticles, which added value to its applications as a biostatic membrane system for filtration and separation issues.

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Applications and Properties of Chitosan

Cited by 55 publications

References 0 publications

Effect of Homogenization Method and Carvacrol Content on Microstructural and Physical Properties of Chitosan-Based Films

Effect of Homogenization Method and Carvacrol Content on Microstructural and Physical Properties of Chitosan-Based Films

Ionotropic Gelation of Chitosan Flat Structures and Potential Applications

Small AgNP in the Biopolymer Nanocomposite System

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