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Chitosan/Hydrophilic Plasticizer-Based Films: Preparation, Physicochemical and Antimicrobial Properties

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Abstract

The addition of plasticizers to biopolymer films is a good method for improving their physicochemical properties. The aim of this study was to evaluate the effect of chitosan (CHI) blended with two hydrophilic plasticizers glycerol (GLY) and sorbitol (SOR), at two concentrations (20 and 40 wt%) on their mechanical, thermal, barrier, structural, morphological and antimicrobial properties. The chitosan was prepared through the alkaline deacetylation of chitin obtained from fermented lactic from shrimp heads. The obtained chitosan had a degree of deacetylation (DA) of 84 ± 2.7 and a molecular weight of 136 kDa, which indicated that a good film had formed. The films composed of CHI and GLY (20 wt%) exhibited the best mechanical properties compared to the neat chitosan film. The percentage of elongation at break increase to over 700 % in the films that contained 40 % GLY, and these films also exhibited the highest values for the water vapor transmission rate (WVTR) of 79.6 ± 1.9 g m2 h−1 and a yellow color (b o  = 17.9 ± 2.0) compared to the neat chitosan films (b o  = 8.8 ± 0.8). For the structural properties, the Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction analyses revealed an interaction in the acetamide group and changes in the crystallinity of plasticized films. The scanning electron micrographs revealed that all formulations of the chitosan films were smooth, and that they did not contain aggregations, pores or microphase separation. The thermal analysis using differential scanning calorimetry (DSC) revealed a glass transition temperature (Tg) of 130 °C for neat chitosan film, but the addition of SOR or GLY elicited a decrease in the temperature of the peak (120 °C). In addition, the antimicrobial activity of the chitosan films was evaluated against Listeria monocytogenes, and reached a reduction of 2 log after 24 h. The plasticizer concentration of 20 % GLY is sufficient for obtaining flexible chitosan films with good mechanical properties, and it could serve as an alternative as a packaging material to reduce environmental problems associated with synthetic packaging films.

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Acknowledgments

This research was supported by funds from FONCICYT C002-2008-1/ALA-127 249 and by AGRINOS AS Bio Tech Company. Mr. Rodríguez-Nuñez is grateful to CONACYT (213712). The authors wish to thank to D. Aguilar-Treviño and D. Huerta-Quitanilla for their technical assistance with the XRD and SEM analyses, respectively.

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Authors and Affiliations

  1. Departamento de Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, 5 de Febrero 818 Sur, 85000, Ciudad Obregón, Sonora, Mexico

    Jesús R. Rodríguez-Núñez, Dalia I. Sánchez-Machado & Jaime López-Cervantes

  2. Centro de Investigación en Alimentación y Desarrollo, A.C. CTAOV, A.P. 1735, 83304, Hermosillo, Sonora, Mexico

    Tomás J. Madera-Santana & Herlinda Soto Valdez

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  1. Jesús R. Rodríguez-Núñez
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  2. Tomás J. Madera-Santana
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  3. Dalia I. Sánchez-Machado
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  4. Jaime López-Cervantes
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  5. Herlinda Soto Valdez
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Correspondence to Tomás J. Madera-Santana.

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Rodríguez-Núñez, J.R., Madera-Santana, T.J., Sánchez-Machado, D.I. et al. Chitosan/Hydrophilic Plasticizer-Based Films: Preparation, Physicochemical and Antimicrobial Properties. J Polym Environ 22, 41–51 (2014). https://doi.org/10.1007/s10924-013-0621-z

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