Physico-chemical properties of Chitosan films

Balau, Luminita Elena; Lisă, Gabriela; Popa, Marcel; Ţura, Vasile; Melnig, V.

doi:10.2478/bf02482727

Cited by 74 publications

(68 citation statements)

References 22 publications

(18 reference statements)

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“…Since the grade of chitosan used in the present study was C80% deacetylated, the C=O stretching (amide I) peak at 1646 cm -1 and N-H bending (amide II) peak at 1580 cm -1 were observed. These peaks represented the structure of N-acetylglucosamine, which could be found in chitosan with a lower degree of deacetylation [27][28][29]. The peak at 1545 cm -1 was assigned to strong vibrations of secondary amide.…”

Section: Fourier Transform Infrared Spectroscopy (Ft-ir)mentioning

confidence: 99%

Physical, antibacterial and antioxidant properties of chitosan films incorporated with thyme oil for potential wound healing applications

Altıok

Tıhmınlıoğlu

2010

J Mater Sci: Mater Med

318

179

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Chitosan films incorporated with thyme oil for potential applications of wound dressing were successfully prepared by solvent casting method. The water vapor permeability, oxygen transmission rate, and mechanical properties of the films were determined. Surface and crosssection morphologies and the film thicknesses were determined by Scanning Electron Microscopy (SEM). Fourier transform infrared (FT-IR) spectroscopy was conducted to determine functional group interactions between the chitosan and thyme oil. Thermal behaviors of the films were analyzed by Thermal Gravimetry (TGA) and Differential Scanning Calorimetry (DSC). In addition, the antimicrobial and the antioxidant activities of the films were investigated. The antimicrobial test was carried by agar diffusion method and the growth inhibition effects of the films including different amount of thyme oil were tested on the gram negative microorganisms of Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa and a gram positive microorganism of Staphylococcus aureus. The minimum thyme oil concentration in chitosan films showing the antimicrobial activity on all microorganisms used in the study was found as 1.2 % (v/v). In addition, this concentration showed the highest antioxidant activity due to mainly the carvacrol in thyme oil. Water vapor permeability and oxygen transmission rate of the films slightly increased, however, mechanical properties decreased with thyme oil incorporation. The results revealed that the thyme oil has a good potential to be incorporated into chitosan to make antibacterial and permeable films for wound healing applications.

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Section: Fourier Transform Infrared Spectroscopy (Ft-ir)mentioning

confidence: 99%

Physical, antibacterial and antioxidant properties of chitosan films incorporated with thyme oil for potential wound healing applications

Altıok

Tıhmınlıoğlu

2010

J Mater Sci: Mater Med

318

179

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“…The rheological behavior of chitosan solutions [22][23][24][25] as well its thermal decomposition and stability [26][27][28][29] have been already reported in the literature. However, to our knowledge, no much work has been done on chitosan/agar blends.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Chitosan/Agar Blends: Rheological and Thermal Studies

El-Hefian

Nasef

Yahaya

et al. 2010

J. Chil. Chem. Soc.

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In this work, a number of mixture aqueous solutions of chitosan/agar (CS/AG) at different ratios (considering chitosan as the main component) were prepared. The rheological properties i.e. shearing viscosity and shear stress of the blend solutions as a function of shear rate as well as the thermal properties of the blend films were investigated. Among the parameters studied were temperature, shearing time and storage time. Results showed that almost Newtonian behavior was observed at temperatures from 40 o C to 55 o C for the ratios 100/0, 90/10, 80/20 and 70/30. However, the proportions 60/40 and 50/50 showed a clear shear thinning behavior (pseudoplastic non-Newtonian behavior). It was also found that all the blend solutions obeyed the Arrhenius equation. In addition, the effect of shearing time on the shearing viscosity of all blends did not show any significant differences at all shearing times applied in this study except the proportion 50/50 wherein decreasing in shearing viscosity and shear stress was observed as the shearing time increased. Furthermore, different behaviors were observed for the blend solutions when the period of storage was extended to three weeks. The FTIR results and the differential scanning calorimetery (DSC) curves showed that the interaction between chitosan and agar can occur.

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“…Chitosan, at low concentration, is dissolved in acidic conditions (generally in acetic acid solutions), and the mixture is then cast in a Petri dish at moderate temperature (from ambient to 50 °C) until complete solvent evaporation [8,20]. Chitosan films produced with the solvent casting method are fragile at small thicknesses; for larger thicknesses, the internal tension increases and a rough surface is obtained [21]. Since it is difficult to scale-up the casting solvent method to obtain chitosan-based films, and because the properties of these films are not robust enough for a large range of applications, chitosan transformation using a conventional melt processing approach would be a highly desirable alternative.…”

Section: Introductionmentioning

confidence: 99%

Novel multiphase systems based on thermoplastic chitosan: Analysis of the structure-properties relationships

Avérous¹,

Pollet²

2016

AIP Conference Proceedings

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Abstract. In the last years, biopolymers have attracted great attention. It is for instance the case of chitosan, a linear polysaccharide. It is a deacetylated derivative of chitin, which is the second most abundant polysaccharide found in nature after cellulose. Chitosan has been found to be nontoxic, biodegradable, biofunctional, and biocompatible in addition to having antimicrobial and antifungal properties, and thus has a great potential for environmental (packaging, ) or biomedical applications.For preparing chitosan-based materials, only solution casting or similar methods have been used in all the past studies. Solution casting have the disadvantage in low efficiency and difficulty in scaling-up towards industrial applications. Besides, a great amount of environmentally unfriendly chemical solvents are used and released to the environment in this method. The reason for not using a melt processing method like extrusion or kneading in the past studies is that chitosan, like many other polysaccharides such as starch, has very low thermal stability and degrade prior to melting. Therefore, even if the melt processing method is more convenient and highly preferred for industrial production, its adaptation for polysaccharide-based materials remains very difficult. However, our recently published studies has demonstrated the successful use of an innovative melt processing method (internal mixer, extrusion, ) as an alternative route to solution casting, for preparing materials based on thermoplastic chitosan. These promising thermoplastic materials, obtained by melt processing, have been the main topic of recent international projects, with partners from different countries Multiphase systems based on various renewable plasticizers have been elaborated and studied. Besides, different blends, and nano-biocomposites based on nanoclays, have been elaborated and fully analyzed. The initial consortium of this vast project was based on an international consortium (Canada, Australia, France). This project is currently ongoing and open, with new international academic partners (Mexico, Brazil and Spain).

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Physico-chemical properties of Chitosan films

Cited by 74 publications

References 22 publications

Physical, antibacterial and antioxidant properties of chitosan films incorporated with thyme oil for potential wound healing applications

Physical, antibacterial and antioxidant properties of chitosan films incorporated with thyme oil for potential wound healing applications

Preparation and Characterization of Chitosan/Agar Blends: Rheological and Thermal Studies

Novel multiphase systems based on thermoplastic chitosan: Analysis of the structure-properties relationships

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