Properties Of Biodegradable Films Research Articles

Development and properties of biodegradable film from peach palm (Bactris gasipaes)

Formulations of biodegradable films using macrocarpa peach palm flour (low amylose starch), chitosan and glycerol, were developed and the effects of the drying temperature on films by assessing their physicochemical, mechanical, barrier, optical, structural, antioxidant properties, and the biodegradability in soil were evaluated. Chitosan enhanced the mechanical properties of the films, but they showed no antimicrobial activity against the tested food-borne pathogens, except for Listeria monocytogenes, for which the inhibition zone was from 0.1 to 0.6 cm. Films with higher concentrations of peach palm flour are opaquer, with better antioxidant characteristics and content of phenolic compounds compared to films made with lower concentrations of flour. The films presented a yellowish color because of the carotenoids found in peach palm flour, 29.63 μg 100 g−1, and exhibited a C-type X-ray pattern, characteristic peak of materials where amylose and amylopectin are present. After 15 days in soil, the films lost 30% of their initial weight. Therefore, these results suggest that the development of films as food preservative is a promising field and that the material used in the study are suitable for their formulation.

Physico-Chemical, Mechanical and Morphological Properties of Biodegradable Films Based on Arrowroot Starch and Poly(vinyl alcohol)

Biodegradable polymeric blends have been widely studied due to their potential of reducing pollution caused by non-biodegradable materials. The research described here describes a polymer blend that benefits both from the abundance of arrowroot starch (AS) and the good mechanical properties of poly(vinyl alcohol) (PVA). Glycerol (GLY) was used in different proportions as a plasticizer. The addition of GLY improved the mechanical properties of the blends, increasing the elongation at break up to 667%. On the other hand, the GLY addition adversely affected other properties, increasing the water vapor permeability (WVP), solubility and hydrophilic characteristics and reducing the thermal stability and the crystallinity index. The AS/PVA blend without GLY addition showed better physical-chemical properties, having strong chemical interaction between the two kinds of polymeric chains (according FTIR analysis) and a homogeneous morphology (SEM morphological analysis). In general, decreasing the AS content improved the mechanical and WVP properties, the film becoming less hydrophilic. In conclusion, the AS/PVA blends cast films, with or without GLY, are biodegradable materials suitable for packaging applications.

Effect of convection drying and lyophilization of fish myofibrillar proteins on the technological properties of biodegradable films

This study aimed to verify the effects of different drying methods and temperatures of fish myofibrillar proteins (MPs), on the technological properties of biodegradable films. The MPs were dried by lyophilization at −60 °C for 48 h and by convective drying of hot air at 40 °C, 60 °C, and 80 °C. In the drying by convection, drying curves were constructed and the adjustments of mathematical models were evaluated. The films were formulated with 1.5% proteins (w/v) and 30% glycerol (w/w), and they were characterized. The drying times found were 540 min (40 °C), 300 min (60 °C), and 120 min (80 °C). The “Logarithmic” models followed by the “Diffusion approach” were the ones that best fit for all temperatures. The results of protein electrophoresis and the characterization of the film showed that the convective drying caused changes in the three-dimensional structure of the proteins, favoring the formation of a highly cross-linked protein network with numerous hydrogen bonds, hydrophobic interactions, and disulfide bonds, and generating films with properties equal to or better than lyophilized proteins.

A Swelling Study in Different PH and Mechanical Properties of Biodegradable Films Based on Pluronic F-127/ Poly-Vinyl Alcohol

PluronicF-127/PVA polymeric biomaterials blend films plasticized with glycerin were prepared by solvent molding method. The polymer blend films were characterized using Fourier transform infrared (FTIR) spectroscopy, Field Emission Scanning Electron Microscopy and mechanical measurements. The FTIR spectra of the two polymers and their blends show that there is no chemical interaction between the PVA and the PluronicF-127. FESEM images indicate that blend homogeneous film can easily be prepared. Mechanical and swelling properties of the studied blends indicate that these can be used for medical application such as biodegradable materials and biodegradable drugs carriers and as food packaging materials.

Effect of dual chemical modification on the properties of biodegradable films from achira starch

AbstractThe objective of this study was to evaluate the effect of a dual modification (acid hydrolysis and succination) on the structural, mechanical, thermomechanical, and permeability properties of films from achira starch. Micrographs of films revealed a smooth surface and some remnants of starch granules, indicating a partial gelatinization. Tensile strength and percentage of elongation increased in films from double modified starch (10.50 MPa and 42.83%, respectively). The OH groups formed in the amylose and amylopectin chains during the hydrolysis and the alkoxide groups (RO−) generated during the succination resulted in high values of water vapor permeability (3.215 × 10−10 g/s m Pa). The glass transition temperature (Tg) of films from hydrolyzed–succinated starch was decreased due to the reduction of the molecular weight of the polymeric chains and the presence of succinate groups that reduced the molecular interactions of the polymeric chains, increasing the mobility and therefore decreasing the softening temperature.

Technological Properties of Biodegradable Films Produced with Myofibrillar Proteins Extracted from Gilded cat-fish (Brachyplatystoma rousseauxii) Carcasses and Parings

ABSTRACT This paper aimed to investigate whether the type of fish residue used for extraction of myofibrillar proteins (MP) impacts the technological properties of biodegradable films. The MPs were extracted from two types of Gilded cat-fish (Brachyplatystoma rousseauxii) residues: (1) carcass with muscle attached from the production of mechanically separated meat (MSM) and (2) parings from fillet trimming (PAR). The percentage composition and color of the MPs from MSM (P-MSM) and parings (P-PAR) significantly differed, mainly regarding the ash and lipid contents. The presence of these non-protein compounds in P-MSM led to the formation of films with inferior technological and thermal properties, which indicates the type of residue used impacted the film properties.

Influence of organic plasticizers on sensory, physical-mechanical properties and chemical changes of biodegradable films

The research to establish the influence of different organic plasticizers on the properties of biodegradable films was done. The most widespread, relatively inexpensive plasticizers were chosen that were added to the film based on corn starch or modified starch and gelatin. The complex organoleptic indicator of quality is calculated that is the highest in such plasticizers as glycerin and sorbitol; films with glucose, sucrose and fructose as plasticizers have a lower index; films with urea have the lowest index. The changes in tensile strength and elongation depending on the plasticizer are calculated. The obtained results can be explained by properties of organic compounds used as plasticizers. IR Spectroscopy was used to determine that carbohydrates (fructose, glucose, sucrose) and polyhydric alcohols (glycerin, sorbitol) did not enter into chemical reaction with film forming agents (starch and gelatin). Only acid amides (urea) react with gelatin strengthening biodegradable films. The obtained results allow to predict the properties of the films, and in future will help to expand the range of raw materials used to make biodegradable films.

Preparation and properties of biodegradable films from Sterculia urens short fiber/cellulose green composites

The development of commercially viable “green products”, based on natural resources for the matrices and reinforcements, in a wide range of applications, is on the rise. The present paper focuses on Sterculia urens short fiber reinforced pure cellulose matrix composite films. The morphologies of the untreated and 5% NaOH (alkali) treated S. urens fibers were observed by SEM. The effect of 5% NaOH treated S. urens fiber (5, 10, 15 and 20% loading) on the mechanical properties and thermal stability of the composites films is discussed. This paper presents the developments made in the area of biodegradable S. urens short fiber/cellulose (SUSF/cellulose) composite films, buried in the soil and later investigated by the (POM), before and after biodegradation has taken place. SUSF/cellulose composite films have great potential in food packaging and for medical applications.

Effect of UV-Treatment on Properties of Biodegradable Film From Rice Starch

Effect of UV-Treatment on Properties of Biodegradable Film From Rice Starch

Preparation and Properties of Biodegradable Films from Wheat Protein Isolate

Fully biodegradable and eco-friendly green films were made using wheat protein isolate (WPI) through casting method by the addition of plasticizer and cross linking agent and subsequent heating and drying treatments. In this work, the optimum conditions to prepare films from WPI were determined by varying the glycerol content from 10 to 25% and glutaraldehyde from 0 to 40%. The various factors affecting the formation of these films were examined by measuring their mechanical (tensile strength and elongation), spectral and thermal properties and moisture content. The WPI films with 10% of glycerol and 20% glutaraldehyde showed good mechanical properties.