Preparation and Properties of Corn Starch/Chitin Composite Films Cross-Linked by Maleic Anhydride

To improve the functional properties of starch-based films, chitin (CH) was prepared from shrimp shell powder and incorporated into corn starch (CS) matrix. Before blending, maleic anhydride (MA) was introduced as a cross-linker. Composite CS/MA-CH films were obtained by casting-evaporation approach. Mechanical property estimation showed that addition of 0–7 wt % MA-CH improved the tensile strength of starch films from 3.89 MPa to 9.32 MPa. Elongation at break of the films decreased with the addition of MA-CH, but the decrease was obviously reduced than previous studies. Morphology analysis revealed that MA-CH homogeneously dispersed in starch matrix and no cracks were found in the CS/MA-CH films. Incorporation of MA-CH decreased the water vapor permeability of starch films. The water uptake of the films was reduced when the dosage of MA-CH was below 5 wt %. Water contact angles of the starch films increased from 22° to 86° with 9 wt % MA-CH incorporation. Besides, the composite films showed better inhibition effect against Escherichia coli and Staphylococcus aureus than pure starch films.

Download Full-text

Upcycling of Vine Shoots: Production of Fillers for PHBV-Based Biocomposite Applications

Journal of Polymers and the Environment ◽

10.1007/s10924-020-01884-8 ◽

2020 ◽

Cited By ~ 1

Author(s):

Grégoire David ◽

Laurent Heux ◽

Stéphanie Pradeau ◽

Nathalie Gontard ◽

Hélène Angellier-Coussy

Keyword(s):

Water Vapor ◽

Gas Phase ◽

Mechanical Performance ◽

Low Cost ◽

Water Vapor Permeability ◽

Contact Angles ◽

Vapor Permeability ◽

Water Contact ◽

Median Diameter ◽

Cost Of Materials

Abstract This paper aims at investigating the potential of vine shoots (ViSh) upcycling as fillers in novel poly(3-hydroxybutyrate-3-hydroxyvalerate) (PHBV) based biocomposites. ViSh particles of around 50 µm (apparent median diameter) were obtained combining dry grinding processes, and mixed with PHBV using melt extrusion. Thermal stability and elongation at break of biocomposites were reduced with increasing contents of ViSh particles (10, 20 and 30 wt%), while Young’s modulus and water vapor permeability were increased. It was shown that a surface gas-phase esterification allowed to significantly increase the hydrophobicity of ViSh particles (increase of water contact angles from 59° to 114°), leading to a reduction of 27% in the water vapor permeability of the biocomposite filled with 30 wt% of ViSh. The overall mechanical performance was not impacted by gas-phase esterification, demonstrating that the interfacial adhesion between the virgin ViSh particles and the PHBV matrix was already good and that such filler surface treatment was not required in that case. It was concluded that ViSh particles can be interestingly used as low cost fillers in PHBV-based biocomposites to decrease the overall cost of materials.

Download Full-text

Preparation and Characterization of Corn Starch-Nanodiamond Composite Films

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.469.156 ◽

2013 ◽

Vol 469 ◽

pp. 156-161 ◽

Cited By ~ 8

Author(s):

Hong Pan ◽

Dan Xu ◽

Qin Liu ◽

Hui Qing Ren ◽

Min Zhou

Keyword(s):

Water Vapor ◽

Food Packaging ◽

Corn Starch ◽

Composite Films ◽

Water Vapor Permeability ◽

Nanocomposite Films ◽

Vapor Permeability ◽

Ft Ir ◽

Loading Amount ◽

Physical Blending

Starch-based nanocomposite films were fabricated by the incorporation of different amounts of nanodiamond (ND) particles. These films were characterized by SEM, FT-IR, TGA, tensile testing and water vapor permeability measurement. It was observed that at low loadings, ND dispersed well in starch matrix. However, as the loading amount increased, aggregates as large as several micrometers appeared. The physical blending of ND with starch didnt change the thermal degradation mechanisms of starch films, only increased the char residues. As the ND loading increased, the tensile strength of composite films increased but the elongation at break decreased. However, the water vapor permeability increased as the loading of ND increased due to the increased microspores in films. With further modifications, ND may be considered as a novel of biocompatible nanofillers for reinforcement of biopolymers for food packaging applications.

Download Full-text

Effects of Zein on Film-Forming Ability and Properties of Wheat Gluten Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.1582 ◽

2013 ◽

Vol 750-752 ◽

pp. 1582-1585

Author(s):

Chun Hong Zhang ◽

Nan Chang ◽

Chen Li ◽

Xin Hua Li

Keyword(s):

Water Retention ◽

Wheat Gluten ◽

Composite Films ◽

Antibacterial Properties ◽

Water Vapor Permeability ◽

Vapor Permeability ◽

Hydrogen Bond Interaction ◽

Elongation At Break ◽

Film Forming ◽

And Staphylococcus Aureus

Zein was added into wheat gluten (WG) to prepare zein composite films (ZCF) in order to improve the properties of films. The film-forming ability, properties, surface microstructure and infrared spectrum of WG films and ZCF were investigated. The results show that the viscosity of film-forming solutions decrease, and uniformity become worse slightly, after zein added. ZCF are yellow, with metal luster, whose toughness and water retention increase. Compared to the control, the ZCF tensile strength (TS), elongation at break (EB) and resistance of oxygen are increased by 33.2%, 17.2% and 11.25%, and water vapor permeability (WVP) and transparency are decreased by 26.0% and 75.4% respectively. ZCF have better antibacterial properties than WG films. The inhibition effect on escherichia coli and staphylococcus aureus are increased by 36.36% and 32.89% respectively. Hydrogen bond interaction of ZCF become weak, and the surface of ZCF become smooth and evenly.

Download Full-text

Flexible Thermoplastic Starch Films Functionalized With Copper Particles for Packaging of Food Products

10.21203/rs.3.rs-33435/v2 ◽

2020 ◽

Author(s):

Olivia López ◽

María E. Villanueva ◽

Guillermo J. Copello ◽

Marcelo A Villar

Keyword(s):

Inhibitory Concentration ◽

Corn Starch ◽

Composite Films ◽

Thermoplastic Starch ◽

Biodegradable Films ◽

Melt Mixing ◽

Elongation At Break ◽

Copper Particles ◽

Starch Films ◽

Fresh Products

Abstract Biodegradable films based on thermoplastic corn starch (TPS) and copper particles with antimicrobial capacity were developed. Copper nanoparticles (Cu) and silica coated copper microparticles (Si-Cu) in the range of 0.25 to 5 % were used. Composite films were obtained by melt-mixing and subsequent thermo-compression. Particles distribution within TPS matrix and the presence of some pores and cracks, induced by Si-Cu particles, was evaluated by SEM. The presence of both fillers gave to composite films a brown pigmentation and decreased their transparency; these effects were more pronounced at higher particles concentrations. Regarding mechanical properties, copper particles at 1 and 5 % acted as reinforcing agents increasing the maximum tensile strength but their presence lead to a decrease in elongation at break, affecting films ductility. Composites inhibited the growth of Gram+ and Gram- bacteria, demonstrating their antimicrobial capacity. Copper effectively migrated to a simulant of aqueous foods and naked particles concentration in the simulant medium resulted higher than the minimum inhibitory concentration for bacteria. The characteristics and properties of developed composite films make them an interesting material for food primary packaging, mainly for meat fresh products.

Download Full-text

Flexible Thermoplastic Starch Films Functionalized With Copper Particles for Packaging of Food Products

10.21203/rs.3.rs-33435/v1 ◽

2020 ◽

Author(s):

Olivia López ◽

María E. Villanueva ◽

Guillermo J. Copello ◽

Marcelo A Villar

Keyword(s):

Inhibitory Concentration ◽

Corn Starch ◽

Composite Films ◽

Thermoplastic Starch ◽

Biodegradable Films ◽

Melt Mixing ◽

Elongation At Break ◽

Copper Particles ◽

Starch Films ◽

Fresh Products

Abstract Biodegradable films based on thermoplastic corn starch (TPS) and copper particles with antimicrobial capacity were developed. Copper nanoparticles (Cu) and silica coated copper microparticles (Si-Cu) in the range of 0.25 to 5 % were used. Composite films were obtained by melt-mixing and subsequent thermo-compression. Particles distribution within TPS matrix and the presence of some pores and cracks, induced by Si-Cu particles, was evaluated by SEM. The presence of both fillers gave to composite films a brown pigmentation and decreased their transparency; these effects were more pronounced at higher particles concentrations. Regarding mechanical properties, copper particles at 1 and 5 % acted as reinforcing agents increasing the maximum tensile strength but their presence lead to a decrease in elongation at break, affecting films ductility. Composites inhibited the growth of Gram+ and Gram- bacteria, demonstrating their antimicrobial capacity. Copper effectively migrated to a simulant of aqueous foods and naked particles concentration in the simulant medium resulted higher than the minimum inhibitory concentration for bacteria.The characteristics and properties of developed composite films make them an interesting material for food primary packaging, mainly for meat fresh products.

Download Full-text

Characterization of Chitosan Films Incorporated with Different Substances of Konjac Glucomannan, Cassava Starch, Maltodextrin and Gelatin, and Application in Mongolian Cheese Packaging

Coatings ◽

10.3390/coatings11010084 ◽

2021 ◽

Vol 11 (1) ◽

pp. 84

Author(s):

Sijun Ma ◽

Yuanrong Zheng ◽

Ran Zhou ◽

Ming Ma

Keyword(s):

Composite Film ◽

Composite Films ◽

Water Vapor Permeability ◽

Cassava Starch ◽

Konjac Glucomannan ◽

Vapor Permeability ◽

Elongation At Break ◽

Chitosan Composite ◽

Storage Characteristics

Four kinds of edible composite films based on chitosan combined with additional substances (konjac glucomannan, cassava starch, maltodextrin and gelatin) and the addition of lysozyme were prepared and used as packaging materials for Mongolian cheese. The prepared composite films were evaluated using scanning electron microscopy and Fourier transform infrared spectroscopy. The physicochemical properties of all chitosan composite films, including thickness, viscosity, opacity, color, moisture content, water vapor permeability, tensile strength and elongation at break, were measured. The results show that Konjac glucomannan–chitosan composite film presented the strongest mechanical property and highest transparency. The cassava starch–chitosan composite film presented the highest water barrier property. The study on the storage characteristics of Mongolian cheese was evaluated at 4 °C. The results show that the cheese packaging by cassava starch–chitosan composite film presented better treatment performance in maintaining the quality, reducing weight loss and delayering microbial growth.

Download Full-text

Flexible Thermoplastic Starch Films Functionalized With Copper Particles for Packaging of Food Products

10.21203/rs.3.rs-33435/v3 ◽

2020 ◽

Author(s):

Olivia López ◽

María E. Villanueva ◽

Guillermo J. Copello ◽

Marcelo A Villar

Keyword(s):

Inhibitory Concentration ◽

Corn Starch ◽

Composite Films ◽

Thermoplastic Starch ◽

Biodegradable Films ◽

Melt Mixing ◽

Elongation At Break ◽

Copper Particles ◽

Starch Films ◽

Fresh Products

Abstract Biodegradable films based on thermoplastic corn starch (TPS) and copper particles with antimicrobial capacity were developed. Copper nanoparticles (Cu) and silica coated copper microparticles (Si-Cu) in the range of 0.25 to 5 % were used. Composite films were obtained by melt-mixing and subsequent thermo-compression. Particles distribution within TPS matrix and the presence of some pores and cracks, induced by Si-Cu particles, was evaluated by SEM. The presence of both fillers gave composite films a brown pigmentation and decreased their transparency; these effects were more pronounced at higher particles concentrations. Regarding mechanical properties, copper particles at 1 and 5 % acted as reinforcing agents increasing the maximum tensile strength but their presence lead to a decrease in elongation at break, affecting films ductility. Composites inhibited the growth of Gram+ and Gram- bacteria, demonstrating their antimicrobial capacity. Copper effectively migrated to a simulant of aqueous foods and naked particles concentration in the simulant medium resulted higher than the minimum inhibitory concentration for bacteria. The characteristics and properties of developed composite films make them an interesting material for food primary packaging, mainly for meat fresh products.

Download Full-text

Mechanical and Water Barrier Properties of Zein–Corn Starch Composite Films as Affected by Gallic Acid Treatment

International Journal of Food Engineering ◽

10.1515/ijfe-2016-0112 ◽

2016 ◽

Vol 12 (8) ◽

pp. 773-781 ◽

Cited By ~ 1

Author(s):

Kingsley Masamba ◽

Yue Li ◽

Hafiz Rizwan Sharif ◽

Jianguo Ma ◽

Fang Zhong

Keyword(s):

Composite Film ◽

Gallic Acid ◽

Acid Treatment ◽

Corn Starch ◽

Composite Films ◽

Water Vapor Permeability ◽

Barrier Properties ◽

Vapor Permeability ◽

Water Barrier ◽

Film Forming

Abstract The effect of gallic acid treatment on mechanical and water barrier properties in zein and zein–corn starch composite films was investigated. Four concentrations of corn starch (5 %, 10 %, 15 %, 20 %) were used in composite films making a final solid concentration of 6 % (w/v) in the film forming solution. One composite film containing 10 % corn starch was also prepared in absence of gallic acid for comparison purpose. Gallic acid treatment improved tensile strength (TS) and water vapor permeability (WVP) while solubility was increased in control zein films. On the other hand, gallic acid treatment significantly (p < 0.05) reduced TS and increased WVP in zein–corn starch composite films. Interestingly, mechanical and water barrier properties of composite films prepared in absence of gallic acid were comparatively better than gallic acid treated composite films. These findings provided useful insights in how each individual hydrocolloid in the composite film was differently affected by gallic acid treatment.

Download Full-text

Curcumin-Loaded Bacterial Cellulose/Alginate/Gelatin as A Multifunctional Biopolymer Composite Film

Molecules ◽

10.3390/molecules25173800 ◽

2020 ◽

Vol 25 (17) ◽

pp. 3800 ◽

Cited By ~ 1

Author(s):

Nadda Chiaoprakobkij ◽

Thapanar Suwanmajo ◽

Neeracha Sanchavanakit ◽

Muenduen Phisalaphong

Keyword(s):

Oral Cancer ◽

Bacterial Cellulose ◽

Wound Care ◽

Artificial Saliva ◽

Water Vapor Permeability ◽

Contact Angles ◽

Vapor Permeability ◽

Sem Images ◽

Water Contact

Multifunctional biopolymer composites comprising mechanically-disintegrated bacterial cellulose, alginate, gelatin and curcumin plasticized with glycerol were successfully fabricated through a simple, facile, cost-effective mechanical blending and casting method. SEM images indicate a well-distributed structure of the composites. The water contact angles existed in the range of 50–70°. Measured water vapor permeability values were 300–800 g/m2/24 h, which were comparable with those of commercial dressing products. No release of curcumin from the films was observed during the immersion in PBS and artificial saliva, and the fluid uptakes were in the range of 100–700%. Films were stretchable and provided appropriate stiffness and enduring deformation. Hydrated films adhered firmly onto the skin. In vitro mucoadhesion time was found in the range of 0.5–6 h with porcine mucosa as model membrane under artificial saliva medium. The curcumin-loaded films had substantial antibacterial activity against E. coli and S. aureus. The films showed non-cytotoxicity to human keratinocytes and human gingival fibroblasts but exhibited potent anticancer activity in oral cancer cells. Therefore, these curcumin-loaded films showed their potential for use as leave-on skin applications. These versatile films can be further developed to achieve desirable characteristics for local topical patches for wound care, periodontitis and oral cancer treatment.

Download Full-text