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Materials 2018, 11(1), 120;

Chitosan-Starch Films with Natural Extracts: Physical, Chemical, Morphological and Thermal Properties

Tecnológico Nacional de México-Instituto Tecnológico de Ciudad Madero, Centro de Investigación en Petroquímica, Prolongación Bahía de Aldair, Ave. De las Bahías, Parque de la Pequeña y Mediana Industria, Altamira, Tamaulipas 89600, Mexico
Tecnológico Nacional de México-Instituto Tecnológico de Querétaro, -División de Estudios de Posgrado e Investigación, Av. Tecnológico s/n esquina Gral. Mariano Escobedo, Centro Histórico, Querétaro, Querétaro 76000, Mexico
Centro de Investigación en Materiales Avanzados, S. C., Departamento de Materiales Nanoestructurados, Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua, Chihuahua 31136, Mexico
Author to whom correspondence should be addressed.
Received: 28 November 2017 / Revised: 7 January 2018 / Accepted: 8 January 2018 / Published: 12 January 2018
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The aim of this study is to analyze the properties of a series of polysaccharide composite films, such as apparent density, color, the presence of functional groups, morphology, and thermal stability, as well as the correlation between them and their antimicrobial and optical properties. Natural antioxidants such as anthocyanins (from cranberry; blueberry and pomegranate); betalains (from beetroot and pitaya); resveratrol (from grape); and thymol and carvacrol (from oregano) were added to the films. Few changes in the position and intensity of the FTIR spectra bands were observed despite the low content of extract added to the films. Due to this fact, the antioxidants were extracted and identified by spectroscopic analysis; and they were also quantified using the Folin-Denis method and a gallic acid calibration curve, which confirmed the presence of natural antioxidants in the films. According to the SEM analysis, the presence of natural antioxidants has no influence on the film morphology because the stretch marks and white points that were observed were related to starch presence. On the other hand, the TGA analysis showed that the type of extract influences the total weight loss. The overall interpretation of the results suggests that the use of natural antioxidants as additives for chitosan-starch film preparation has a prominent impact on most of the critical properties that are decisive in making them suitable for food-packing applications. View Full-Text
Keywords: polysaccharides; composite films; chitosan-starch; natural antioxidants; film properties polysaccharides; composite films; chitosan-starch; natural antioxidants; film properties

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Lozano-Navarro, J.I.; Díaz-Zavala, N.P.; Velasco-Santos, C.; Melo-Banda, J.A.; Páramo-García, U.; Paraguay-Delgado, F.; García-Alamilla, R.; Martínez-Hernández, A.L.; Zapién-Castillo, S. Chitosan-Starch Films with Natural Extracts: Physical, Chemical, Morphological and Thermal Properties. Materials 2018, 11, 120.

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