Characterization of Functional Properties of Biodegradable Films Based on Starches from Different Botanical Sources

Abstract

Starch is the main biopolymer used to develop biodegradable films and coatings, mainly due to its availability in nature and low cost. Therefore, it is important to determine the properties of starch-based packaging materials, since the characteristics of each material may differ according to the botanical source. In this study, the functional properties of biodegradable films made from starch isolated from four botanical sources, corn, sorghum, potato, and achira are evaluated. The mechanical, water vapor barrier, morphological, thermal, and hydration properties are studied. Obtained films have a homogeneous appearance with no pores or cracks. The potato and achira films present some non-gelatinized granules on their surface, however, they are the ones that present the highest mechanical properties, where the non-gelatinized granules function as a reinforcing material for the polymer matrix. The red sorghum starch films present the best barrier for water vapor. The source of starch shows a significant effect on the tensile strength (TS) and percentage of elongation at breaking (%E). The solubility, swelling index, and water vapor adsorption capacity change significantly when comparing the four botanical sources, mainly because of the differences in the morphology of the resulting materials, amylose content and the size of the starch granule.

Study of the Preparation and Properties of TPS/PBSA/PLA Biodegradable Composites

“…Due to the renewable, biodegradable resource and low price, starch is widely used in the manufacturing industry for food, medicine, plastic and chemical packaging [1][2][3][4][5][6]. At present, the production of starch degradable plastics accounts for more than 60% of the total production of degradable plastics [7][8][9][10][11]. However, natural starch is a polyhydroxy compound, and the adjacent molecules interact with each other by hydrogen bonds to form complete particles with a microcrystalline structure, which contributes to poor processing and mechanical properties [12][13][14][15][16][17].…”

Effects of Poloxamer Content and Storage Time of Biodegradable Starch-Chitosan Films on Its Thermal, Structural, Mechanical, and Morphological Properties

“… 1. Hunter color parameters, L*: color coordinate, lightness (0 = black, 100 = white); a*: color coordinate, greenness and redness (+ = red, − = green); b*: color coordinate, blueness to yellowness (+ = yellow, − = blue).…”

“…Mean values of at least three replicates. § Experimental data and significant difference taken from Fonseca-García, Jiménez-Regalado[11] 1. Hunter color parameters, L*: color coordinate, lightness (0 = black, 100 = white); a*: color coordinate, greenness and redness (+ = red, − = green); b*: color coordinate, blueness to yellowness (+ = yellow, − = blue).Mean values of at least three replicates.…”

Green synthesis of biodegradable terpolymer modified starch nanocomposite with carbon nanoparticles for food packaging application

“…34 Gómezaldapa et al analyzed the properties of biodegradable films of different starch sources by changing the plasticizers. 35 The operational properties and the microstructure morphology of potato starch/gelatin/glycerol edible bio-composite films were reported by Podshivalov et al 36 Starch has been extensively studied for packing materials. [37][38][39] The cornstarch-based bioplastics have proven excellent properties that are comparable to the commercial packaging materials.…”

“…Schirmer et al varied the amylose/amylopectin ratio of different starches and studied the physicochemical and morphological characterization 34 . Gómez‐aldapa et al analyzed the properties of biodegradable films of different starch sources by changing the plasticizers 35 . The operational properties and the microstructure morphology of potato starch/gelatin/glycerol edible bio‐composite films were reported by Podshivalov et al 36 …”