scholarly journals Effect of cellulose nanofibers concentration on mechanical, optical, and barrier properties of gelatin-based edible films

DYNA ◽  
2015 ◽  
Vol 82 (191) ◽  
pp. 219-226 ◽  
Author(s):  
Ricardo David Andrade Pizarro ◽  
Olivier Skurtys ◽  
Fernando Osorio-Lira
Keyword(s):  
Mechanical Properties ◽  
Water Vapor ◽  
Cellulose Nanofibers ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Edible Films ◽  
Mechanical Tests ◽  
Vapor Permeability ◽  
Glycerol Concentration ◽  
Gelatin Concentration

The effect of gelatin, glycerol, and cellulose nanofiber (CNFs) concentrations on the mechanical properties, water vapor permeability, and color parameters of films was evaluated. The results indicate that the color is only affected by the gelatin concentration. Mechanical tests indicated that with increasing concentration of gelatin and CNFs, there is an increase in tensile strength, whereas an increase in glycerol concentration causes an increase in elongation, making the films more flexible. An increased concentration of gelatin and glycerol makes the film more permeable to water vapor, while an increase in the concentration of CNFs reduces this property. Finally, the addition of CNFs to gelatin-based films improves their mechanical and barrier properties (water vapor) without affecting the appearance (color) of the films.

Research on Preparation and Properties of Edible Composite Protein Films

2011 ◽  
Vol 87 ◽  
pp. 213-222 ◽  
Author(s):  
Gui Yun Chen ◽  
Qiao Lei
Keyword(s):  
Mechanical Properties ◽  
Water Vapor ◽  
Water Solubility ◽  
Water Vapor Permeability ◽  
Sodium Caseinate ◽  
Barrier Properties ◽  
Edible Films ◽  
Protein Isolate ◽  
Vapor Permeability ◽  
Protein Films

Edible films based on whey protein isolate and sodium caseinate were prepared by uniform design method. Glycerol has been incorporated into the edible films as a plasticizer. For all types of films, the influences of components and forming temperature on film properties, such as mechanical properties, water solubility, optical properties, gas and water vapor permeability were investigated. The results suggested that glycerol was the most important factor influencing all the properties of edible composite protein films. However, both increases of sodium caseinate concentration and glycerol content contributed to decrease the barrier properties of gas and water vapor. Among the films studied, group D (prepared with 5% whey protein isolate, 2% sodium caseinate, 50% glycerol at the temperature of 50 °C) showed moderate mechanical properties, optical properties, water solubility and maximum barrier properties of gas and water vapor, with tensile strength=5.85MPa, elongation=101.20%, transparency=91.4%, gas permeability rate=49.92cm3m-2d-10.1MPa-1and water vapor permeability of 0.128×10-11g m-1s-1Pa-1, 0.260×10-11g m-1s-1Pa-1, 0.513×10-11g m-1s-1Pa-1, 1.252×10-11g m-1s-1Pa-1at the RH gradient of 10-40%, 10-50%, 10-60%, 10-70%, respectively.

scholarly journals Preparation and Characterization of Edible Dialdehyde Carboxymethyl Cellulose Crosslinked Feather Keratin Films for Food Packaging

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 158
Author(s):  
Yao Dou ◽  
Liguang Zhang ◽  
Buning Zhang ◽  
Ming He ◽  
Weimei Shi ◽  
...  
Keyword(s):  
Water Vapor ◽  
Carboxymethyl Cellulose ◽  
Food Packaging ◽  
Light Transmission ◽  
Value Added ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Edible Films ◽  
Vapor Permeability ◽  
Feather Keratin

The development of edible films based on the natural biopolymer feather keratin (FK) from poultry feathers is of great interest to food packaging. Edible dialdehyde carboxymethyl cellulose (DCMC) crosslinked FK films plasticized with glycerol were prepared by a casting method. The effect of DCMC crosslinking on the microstructure, light transmission, aggregate structure, tensile properties, water resistance and water vapor barrier were investigated. The results indicated the formation of both covalent and hydrogen bonding between FK and DCMC to form amorphous FK/DCMC films with good UV-barrier properties and transmittance. However, with increasing DCMC content, a decrease in tensile strength of the FK films indicated that plasticization, induced by hydrophilic properties of the DCMC, partly offset the crosslinking effect. Reduction in the moisture content, solubility and water vapor permeability indicated that DCMC crosslinking slightly reduced the moisture sensitivity of the FK films. Thus, DCMC crosslinking increased the potential viability of the FK films for food packaging applications, offering a value-added product.

scholarly journals Physical Properties of Starch/Powdered Activated Carbon Composite Films

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4406
Author(s):  
Anita Kwaśniewska ◽  
Michał Świetlicki ◽  
Adam Prószyński ◽  
Grzegorz Gładyszewski
Keyword(s):  
Mechanical Properties ◽  
Activated Carbon ◽  
Water Vapor ◽  
Water Solubility ◽  
Composite Films ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Carbon Composite ◽  
Powdered Activated Carbon ◽  
Vapor Permeability

In the present study, starch/powdered activated carbon composite films were prepared by incorporating various amounts of powdered activated carbon (PAC)—1–5, 10, and 15 %—into a starch matrix, using the solvent casting method. The effect of PAC addition on the biopolymer film was investigated. The mechanical properties were examined by ultra-nanoindentation, nanoscratch, and micro-tensile tests. Since the mechanical properties of biopolymer films are correlated with their structure, the effect of PAC addition was tested using X-ray diffraction. The surface parameters morphology and wettability were analyzed by atomic force microscopy (AFM) and contact angle measurements. The barrier properties were examined by determining water vapor permeability and the water solubility index. The obtained results did not show a monotonic dependence of the mechanical parameters on PAC content, with the exception of the maximum strain, which decreased as the amount of the additive increased. The visible effect of PAC addition was manifested in changes in the adhesive force value and in water vapor permeability (WVP). The barrier properties decreased with the increase of the filler content.

Preparation of Porous Cellulose Packaging Films in Alcohol Coagulation

2012 ◽  
Vol 262 ◽  
pp. 557-560
Author(s):  
Shan Shan Gao ◽  
Jian Qing Wang ◽  
Xiu Feng Ma ◽  
Lin Zhao
Keyword(s):  
Mechanical Properties ◽  
Water Vapor ◽  
Fruits And Vegetables ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Vapor Permeability ◽  
Porous Films ◽  
Packaging Films ◽  
Different Types ◽  
Current Concerns

The barrier properties of the cellulose packaging films are current concerns for the fields of fruits and vegetables fresh-keeping packaging. One such porous films commonly used the pore formers as hole-forming materials whereas the compatibility and dispersity were not better with the cellulose solutions. In this study, the porous cellulose packaging films were prepared with natural broad-leaved pulp and LiCl/DMAc with different types of coagulation baths. The effects of methanol, ethanol, isopropanol, LiCl/DMAc and deionized water coagulation baths on the physical structures, oxygen and water vapor permeabilities and mechanical properties of the films were measured. Based on the scanning electron microscpy (SEM) observation, the cross section was loose when used the alcohol coagulations, especially the films with ethanol coagulation showed dactylopores. It was also found that the oxygen permeability had obviously improving with the effect of ethanol, which compared with water vapor permeability of the films. The porous cellulose packaging films had better mechanical properties and up to 12.7MPa which would satisfy the usage in packaging.

Hybrid films from plant and bacterial nanocellulose: mechanical and barrier properties

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Thiago Moreira Cruz ◽  
Adriano Reis Prazeres Mascarenhas ◽  
Mário Vanoli Scatolino ◽  
Douglas Lamounier Faria ◽  
Lays Camila Matos ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Water Vapor ◽  
Mechanical Performance ◽  
Cellulose Nanofibrils ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Contact Angles ◽  
Vapor Permeability ◽  
Hybrid Films

Abstract The accumulation of petroleum polymers compromises biodiversity and causes environmental problems. Nanocellulose enhances biodegradability and can improve the physical-mechanical performance of materials. The objective was to produce and characterize hybrid films composed of bacterial cellulose (BC) and plant nanocellulose from Eucalyptus (Euc) or Pinus (Pin). Films were produced by the casting method using filmogenic suspensions with different cellulose nanofibrils (CNFs) proportions from both the sources (0, 25, 50, 75 and 100 %). CNFs suspensions were characterized by transmission electron microscopy. The morphology of the films was analyzed using scanning electron microscopy. In addition, the transparency, contact angle, wettability, oil and water vapor barrier and mechanical properties were also evaluated. The contact angles were smaller for films with BC and the wettability was greater when comparing BC with plant CNFs (0.10 °  s − 1 {\text{s}^{-1}} for 75 % Euc/25 % BC and 0.20 °  s − 1 {\text{s}^{-1}} for 25 % Euc/75 % BC). The water vapor permeability (WVP) of the 100 % BC films and the 25 % Euc/75 % BC composition were the highest among the studied compositions. Tensile strength, Young’s modulus and puncture strength decreased considerably with the addition of BC in the films. More studies regarding pre-treatments to purify BC are needed to improve the mechanical properties of the films.

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