Preparation and Physicochemical Properties of Modified Corn Starch–Chitosan Biodegradable Films

Abstract

Starch is a biopolymer with enormous potential for generating new biodegradable packages due to its easy availability and low cost. However, due to its weak functional properties, limitation of its interaction with some hydroxyl groups and evaluation of blends with other polymers are necessary in order to improve its performance. Glycerol-plasticized acetylated corn starch films were developed using the casting method, and the impact of incorporating chitosan (TPS:CH) in various proportions (75:25, 50:50, and 25:75 v/v) was studied in the present research. The effect of chitosan ratios on the physical, mechanical, water-vapor barrier, and thermal properties of the film was studied. Chitosan-protonated amino groups promoted the formation of intermolecular bonds, improving tensile strength, thermal stability, hydrophobicity, water adsorption capacity, and the gas barrier of starch films. The results show that the film composed of TPS25-CH75 proved to be the best barrier to water vapor; thus, these composite films are excellent choices for developing biodegradable packaging for the food industry.

Effect of Plasticizer Content on Mechanical and Water Vapor Permeability of Maize Starch/PVOH/Chitosan Composite Films

“…In the thermal analysis curves (Figure 2), it was observed that the exhibited degradation around 300 °C. The degradation temperature (Tma film (starch/PVOH/chitosan) was consistent with data previously repor ture for each polymer [5,13]. In general, it was observed that, when in (w/w) of the different plasticizers, two thermal events resulted: the first represented the loss of humidity (see Figure 2A); the second, at appro represented the degradation of the plasticized polymer blend.…”

“…The film-forming solution was dried in an acrylic mold at 65 • C for 5 h in a convection oven (Oven Series 9000, Thermolyne). The drying process and temperature were determined according to the methodology of Calambas, Heidy Lorena, Abril Fonseca, Dayana Adames, Yaneli Aguirre-Loredo and Carolina Caicedo [6], and Jiménez-Regalado, Enrique Javier, Carolina Caicedo, Abril Fonseca-García, Claudia Cecilia Rivera-Vallejo and Rocio Yaneli Aguirre-Loredo [13]. The composite films were previously conditioned for 48 h at 25 • C and 54% RH before evaluating their physicochemical properties.…”

“…The thickness was determined according to the methodology used in a previous study [13] using a micrometer (Mitutoyo, model C112EXB, Aurora, IL, USA).…”

“…To evaluate the mechanical behavior of the films, the tensile strength and percentage of elongation at fracture were determined, following the methodology of Jiménez-Regalado, Enrique Javier, Carolina Caicedo, Abril Fonseca-García, Claudia Cecilia Rivera-Vallejo and Rocio Yaneli Aguirre-Loredo [13]. A texture analyzer equipment (TA.XT Express, Stable Micro Systems, Godalming, UK) was used, provided with tension clamps (A/TG).…”

Development and Characterization of Plantain (Musa paradisiaca) Flour-Based Biopolymer Films Reinforced with Plantain Fibers

“…Finally, an energy absorption band was also observed around 960 cm −1 , indicating the presence of glycosidic bonds in starch due to amylopectin α-16 bonds [45]. Even though different plantain varieties were used, the FTIR is in accordance with a similar analysis carried out by F.M Pelissari et al [19] on plantain starch and flour polymeric films, as well as other starch-based films from other sources such as corn [49] and cassava [50]. In general, the main functional groups detected in TPF correspond to polysaccharides and glycosidic bonds which allow the formation of the polymeric matrix.…”