scholarly journals Preparation and Characterization of Chitosan–Nano-ZnO Composite Films for Preservation of Cherry Tomatoes

Foods ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 3135
Author(s):  
Yu Li ◽  
Yu Zhou ◽  
Zhouli Wang ◽  
Rui Cai ◽  
Tianli Yue ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Composite Film ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Chitosan Film ◽  
Light Transmittance ◽  
Soluble Solid Content ◽  
Nano Zno ◽  
Chitosan Composite ◽  
Cherry Tomatoes

Chitosan is widely used as a natural preservative of fruits and vegetables, but its poor mechanical and water resistances have limited its application. Therefore, in this study, we prepared chitosan composite films by incorporating different amounts of nano-zinc oxide (nano-ZnO) to improve the mechanical properties of chitosan. We also assessed the antibacterial activity of these films against selected microorganisms. The addition of nano-ZnO improved the tensile strength (TS) and elongation at break (EAB) of the chitosan films and reduced their light transmittance. TS and EAB increased from 44.64 ± 1.49 MPa and 5.09 ± 0.38% for pure chitosan film to 46.79 ± 1.65 MPa and 12.26 ± 0.41% for a 0.6% nano-ZnO composite film, respectively. The ultraviolet light transmittance of composite films containing 0.2%, 0.4%, and 0.6% nano-ZnO at 600 nm decreased from 88.2% to 86.0%, 82.7%, and 81.8%, respectively. A disc diffusion test showed that the composite film containing 0.6% nano-ZnO had the strongest antibacterial activity against Alicyclobacillus acidoterrestris, Staphylococcus aureus, Escherichia coli, and Salmonella. In a 15-day preservation study, chitosan composite films containing 0.6% nano-ZnO maintained the soluble solid content of cherry tomatoes, effectively inhibited their respiration, and exhibited good antibacterial properties against the selected microorganisms. Overall, the prepared chitosan nano-ZnO composite film showed a good preservation effect on cherry tomatoes.

scholarly journals Ecofriendly Preparation and Characterization of a Cassava Starch/Polybutylene Adipate Terephthalate Film

Processes ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 329
Author(s):  
Tan Yi ◽  
Minghui Qi ◽  
Qi Mo ◽  
Lijie Huang ◽  
Hanyu Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Water Vapor ◽  
Composite Film ◽  
Water Absorption ◽  
Composite Films ◽  
Thermoplastic Starch ◽  
Light Transmittance ◽  
Infrared Spectrometry ◽  
Nano Zno

Composite films of polybutylene adipate terephthalate (PBAT) were prepared by adding thermoplastic starch (TPS) (TPS/PBAT) and nano-zinc oxide (nano-ZnO) (TPS/PBAT/nano-ZnO). The changes of surface morphology, thermal properties, crystal types and functional groups of starch during plasticization were analyzed by scanning electron microscopy, synchronous thermal analysis, X-ray diffraction, infrared spectrometry, mechanical property tests, and contact Angle and transmittance tests. The relationship between the addition of TPS and the tensile strength, transmittance, contact angle, water absorption, and water vapor barrier of the composite film, and the influence of nano-ZnO on the mechanical properties and contact angle of the 10% TPS/PBAT composite film. Experimental results show that, after plasticizing, the crystalline form of starch changed from A-type to V-type, the functional group changed and the lipophilicity increased; the increase of TPS content, the light transmittance and mechanical properties of the composite membrane decreased, while the water vapor transmittance and water absorption increased. The mechanical properties of the composite can be significantly improved by adding nano-ZnO at a lower concentration (optimum content is 1 wt%).

scholarly journals Effect of Potassium Sorbate and Ultrasonic Treatment on the Properties of Fish Scale Collagen/Polyvinyl Alcohol Composite Film

Molecules ◽  
2019 ◽  
Vol 24 (13) ◽  
pp. 2363 ◽  
Author(s):  
Xue Liang ◽  
Shiyi Feng ◽  
Saeed Ahmed ◽  
Wen Qin ◽  
Yaowen Liu
Keyword(s):  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Composite Film ◽  
Ultrasonic Treatment ◽  
Food Packaging ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Light Transmittance ◽  
Potassium Sorbate ◽  
Fish Scale

Composite films containing different amounts of potassium sorbate (KS) were prepared by using fish scale collagen (Col) and polyvinyl alcohol (PVA). Fourier transform infrared spectroscopy (FTIR), light transmittance, mechanical, water vapor transmission rate (WVTR), and the antibacterial properties of the composite films were analyzed. The results showed that the addition of Col significantly reduced the light transmittance of the composite film, but KS had no significant effect on the light transmission. The tensile strength decreased first and then increased with the addition of KS, while the WVTR increased first and then decreased. The composite film exhibited a certain degree of antibacterial properties against E. coli and S. aureus. In addition, we found that ultrasonic treatment reduced the WVTR, and also improved tensile strength and elongation at break of the composite films, but had no significant effect on other properties. The KS/Col/PVA films have the potential to be used as antimicrobial food packaging.

A Study of the Preparation of Silk Sericin/Chitosan Composite Film for Future Wound Dressing Applications

2015 ◽  
Vol 804 ◽  
pp. 179-182 ◽  
Author(s):  
Piyapong Pankaew ◽  
Pattarinee Klumdoung ◽  
Kittisakchai Naemchanthara
Keyword(s):  
Composite Film ◽  
Wound Dressing ◽  
Composite Films ◽  
Fine Powder ◽  
Silk Sericin ◽  
Vis Spectroscopy ◽  
Silk Worm ◽  
Bombyx Mori Silk ◽  
Film Development ◽  
Chitosan Composite

Silk sericin/chitosan composite films were successfully prepared for possible future wound dressing applications. To prepare the chitosan, shrimp shells were first washed and finely ground to obtain a fine powder before extracting the chitosan using a chemical reaction method. The sericin was extracted from Thai raw cocoons of Bombyx mori silk worm via boiling and drying. To prepare the silk sericin/chitosan composite films, the silk sericin and chitosan solutions with varying volume ratios were mixed in a magnetic stirrer for 30 minutes. They were then dropped on to a plastic mold. The sample was dried at a temperature of 50 °C. The prepared composite films were characterized using UV-VIS spectroscopy, Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM). The results from our studies could provide a method for future composite film development.

Mechanical and antibacterial properties of ZnO/chitosan bio-composite films

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ayse Kalemtas ◽  
Hasan B. Kocer ◽  
Ahmet Aydin ◽  
Pinar Terzioglu ◽  
Gulsum Aydin
Keyword(s):  
Particle Size ◽  
Food Packaging ◽  
Mechanical Test ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Chitosan Film ◽  
Antibacterial Activities ◽  
Diffusion Method ◽  
Zno Powders ◽  
Solution Casting Method

Abstract In the current study, ZnO/chitosan bio-composite films were produced via solution-casting method. Two different ZnO powders, micrometer (d50 ≅ 1.5 μm) and nanometer sized (d50 ≅ 100 nm), were used to investigate the effect of ZnO particle size and concentration (0, 2, and 8% w/w of chitosan) on the mechanical and antibacterial properties of the ZnO/chitosan bio-composite films. The incorporation of the ZnO powders into the chitosan film resulted in an increase in the tensile strength (TS) and a decrease in the elongation at break (EB) values. Mechanical test results revealed that TS and EB properties were considerably affected (p < 0.05) by the concentration and particle size of the ZnO reinforcement. Disc diffusion method demonstrated good antibacterial activities of bio-composite films containing high amount of ZnO (8% w/w of chitosan) against Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, and Bacillus subtilis. The growth-limiting effect of the films was more pronounced for S. aureus and K. pneumoniae. Due to enhanced TS and imparted antibacterial activity of the produced ZnO/chitosan bio-composite films, these materials are promising candidates for applications such as food packaging, wound dressing, and antibacterial coatings for various surfaces.

scholarly journals Zinc Oxide and Copper Chitosan Composite Films with Antimicrobial Activity

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3861
Author(s):  
Candy del Carmen Gamboa-Solana ◽  
Martha Gabriela Chuc-Gamboa ◽  
Fernando Javier Aguilar-Pérez ◽  
Juan Valerio Cauich-Rodríguez ◽  
Rossana Faride Vargas-Coronado ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Zinc Oxide ◽  
Oral Cavity ◽  
Bacterial Load ◽  
Composite Films ◽  
Chitosan Film ◽  
Oral Microbiome ◽  
X Ray ◽  
Chemical Structures ◽  
Chitosan Composite

The role of the oral microbiome and its effect on dental diseases is gaining interest. Therefore, it has been sought to decrease the bacterial load to fight oral cavity diseases. In this study, composite materials based on chitosan, chitosan crosslinked with glutaraldehyde, chitosan with zinc oxide particles, and chitosan with copper nanoparticles were prepared in the form of thin films, to evaluate a new alternative with a more significant impact on the oral cavity bacteria. The chemical structures and physical properties of the films were characterized using by Fourier transform infrared spectroscopy (FTIR,) Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), elemental analysis (EDX), thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and contact angle measurements. Subsequently, the antimicrobial activity of each material was evaluated by agar diffusion tests. No differences were found in the hydrophilicity of the films with the incorporation of ZnO or copper particles. Antimicrobial activity was found against S. aureus in the chitosan film crosslinked with glutaraldehyde, but not in the other compositions. In contrast antimicrobial activity against S. typhimurium was found in all films. Based on the data of present investigation, chitosan composite films could be an option for the control of microorganisms with potential applications in various fields, such as medical and food industry.

scholarly journals Preparation of Long-Term Antibacterial SiO2-Cinnamaldehyde Microcapsule via Sol-Gel Approach as a Functional Additive for PBAT Film

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 897
Author(s):  
Yangfan Xu ◽  
Chongxing Huang ◽  
Xiujie Dang ◽  
Muhammad Rafiullah Khan ◽  
Haohe Huang ◽  
...  
Keyword(s):  
Sustained Release ◽  
Composite Film ◽  
Transmission Rate ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Chemical Properties ◽  
Light Transmittance ◽  
Release Time ◽  
Order Kinetic ◽  
Release Process

The mesoporous silica wall materials can achieve controlled load and sustained-release of active agents. An antimicrobial nanoscale silica microcapsule containing cinnamaldehyde (CA) was prepared by the sol-gel method and applied in poly (butyleneadipate-co-terephthalate) (PBAT) film. The surface morphology, physical and chemical properties, and antibacterial properties of microcapsules and films were studied. The effects of different temperatures and humidities on the release behavior of microcapsules were also evaluated. Results showed that CA was successfully encapsulated in silica microcapsule which had a diameter of 450–700 nm. The antibacterial CA agent had a long-lasting release time under lower temperature and relative humidity (RH) environment. At low temperature (4 °C), the microcapsules released CA 32.35% in the first 18 h, and then slowly released to 56.08% in 216 h; however, the microcapsules released more than 70% in 18 h at 40 °C. At low humidity (50%RH), the release rates of microcapsules at the 18th h and 9th d were 43.04% and 78.01%, respectively, while it reached to equilibrium state at 72 h under 90% RH. The sustained release process of CA in SiO2-CA microcapsules follows a first-order kinetic model. Physicochemical properties of PBAT films loaded with different amounts of microcapsules were also characterized. Results showed that the tensile strength and water vapor transmission rate (WVTR) of the composite film containing 2.5% microcapsules were increased by 26.98% and 14.61%, respectively, compared to the raw film, while the light transmittance was slightly reduced. The crystallinity of the film was improved and can be kept stable up to 384.1 °C. Furthermore, microcapsules and composite film both exhibited distinctive antibacterial effect on Escherichia coli and Listeria monocytogenes. Therefore, SiO2-CA microcapsules and composite films could be a promising material for the active packaging.

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

Coatings ◽  
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.

scholarly journals Structures and Antibacterial Properties of PLA-based Ciprofloxacin Composite Films Deposited by Low-Electron Beam Dispersion

2020 ◽  
Vol 22 (1) ◽  
pp. 35 ◽  
Author(s):  
Beibei Li ◽  
Chun He ◽  
Xiaohong Jiang ◽  
M.A. Yarmolenko ◽  
D.G. Piliptsou ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Antibacterial Activity ◽  
Electron Beam ◽  
Agar Medium ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Diffusion Method ◽  
Mass Ratio ◽  
E Coli ◽  
High Antibacterial Activity

Polylactic acid (PLA)-based ciprofloxacin (Cip) antibacterial films with mass ratio PLA:Cip=1:1 were prepared by low-electron beam dispersion (EBD). The molecular structure, chemical composition and morphology of PLA-based ciprofloxacin antibacterial films were investigated by XPS, FTIR, liquid NMR and SEM. The antibacterial activity of composite films was tested against E. coli ATCC 25922 and S. aureus ATCC 12600 using the agar diffusion method on the solid LB agar medium. XPS and FTIR analysis showed the presence of an antibacterial ingredient in the composite films. Using NMR, it has been shown that the molecular structure of a monolayer of ciprofloxacin is fully consistent with the molecular structure of the initial ciprofloxacin powders. High antibacterial activity of the composite films has been also established and the layers still possess antibacterial activity with regard to S. aureus even after 7 days of leaching in an isotonic solution. The thermal treatment indicates that the composite films can withstand temperatures of 180 °C and keep its structure unchanged.

Improvement of Water Barrier Property of Rice Starch-chitosan Composite Film Incorporated with Lipids

2009 ◽  
Vol 15 (2) ◽  
pp. 149-158 ◽  
Author(s):  
T. Bourtoom ◽  
M.S. Chinnan
Keyword(s):  
Oleic Acid ◽  
Composite Film ◽  
Palm Oil ◽  
Moisture Transfer ◽  
Composite Films ◽  
Water Vapor Permeability ◽  
Rice Starch ◽  
Vapor Permeability ◽  
A Value ◽  
Chitosan Composite

This study investigated the effect of lipid types (oleic acid, palm oil, and margarine) and their concentrations (0, 10, 20, 30, 40, and 50wt%) on the water vapor permeability (WVP), tensile strength (TS), percentage of elongation at break (%E), and structure of emulsified rice starch-chitosan composite film. The influence of rice starch-chitosan composite film incorporated with lipids in controlling the moisture transfer in moisture-sensitive products was determined by wrapping a low aw-type cracker product in rice starch-chitosan composite film. TS and WVP of rice starch-chitosan composite film decreased with the addition of lipids, whereas %E increased in these films. Addition of lipids significantly raised film yellowness for composite films. The results showed that films added with oleic acid gave higher L*, b*, and chroma values but lower a* value than margarine and palm oil, respectively. The lower transparency of the films was noticed when a greater amount of lipid was incorporated (p < 0.05). Oleic acid-incorporated films provided the films with smoother surface and higher values of TS and %E but lower WVP than margarine and palm oil, respectively. Wrapping cracker samples in the rice starch-chitosan composite film incorporated with oleic acid could maintain the hardness and provide longer shelf life and lower moisture content than synthetic polyvinyl chloride film (PVC) and unwrapped (reference) crackers, respectively.

Preparation of Nano-Silver-Containing Polyethylene Composite Film and Ag Ion Migration into Food-Simulants

2020 ◽  
Vol 20 (3) ◽  
pp. 1613-1621 ◽  
Author(s):  
Jing Deng ◽  
Quan Ming Ding ◽  
Wen Li ◽  
Jian Hui Wang ◽  
Dong Min Liu ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Composite Film ◽  
Composite Films ◽  
Light Transmittance ◽  
Distilled Water ◽  
Nano Silver ◽  
E Coli ◽  
Polyethylene Composite ◽  
Food Simulants ◽  
Transverse Tensile

Nano-composite films were developed between silver nanoparticles (Ag NPs) and a low-density polyethylene (LDPE) using master batches by melt extruding and melt compounding. The Ag/PE composite film showed decreased gas permeability, moisture permeability coefficient, the tear strength, the longitudinal and transverse elongation to that of commercial LDPE. Although stiffness increased at high Ag (40 ppm) concentration, but the longitudinal and transverse tensile strength enhance comparing with commercial PE. Light transmittance and haze were comparable. Both Nano-silver and composite films are effective against Escherichia coli (E. coli). Antibacterial activity of nano-silver for E. coli was determined by diameter of the inhibition zone and the minimum inhibitory concentration of nano-silver is detected by tube double dilution method reaching 15.63 ppm. The composite films are effective inhibition of E. coli at concentrations of 40 ppm Ag nanoparticles. Moreover, Nano-silver migration occurs in composite film. One-side migration was conducted to detect under three food simulants (3% acetic acid, 50% ethanol and distilled water) at three degree of temperature (25 °C, 40 °C and 70 °C) on different period of time (2, 4, 6, 8, 10 and 12 hours). These results indicated that the highest migration amount was obtained with 3% acetic acid following distilled water and finally 50% ethanol under same conditions. The migration level is dependent upon time and temperature and high migration time and temperature can enhance migration level. These findings demonstrate that nano-silver-containing polyethylene composite film may have a great potential for developing antibacterial and acid food packaging system.

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