Preparation and characterization of agar/lignin/silver nanoparticles composite films with ultraviolet light barrier and antibacterial properties

Antibacterial sugar palm starch biopolymer composite films were developed and derived from renewable sources and inorganic silver nanoparticles (AgNPs) as main ingredients for antibacterial coatings. The composite films were produced by solution casting method and the mechanical and physicochemical properties were determined by tensile test, Fourier Transform Infrared (FTIR) analysis, thermal gravimetric analysis (TGA), antibacterial screening test and field emission scanning electron microscopy (FESEM) images. It was found that mechanical and antibacterial properties of biocomposite films were improved after the addition of AgNPs compared with the film without active metals. The weakness of neat biocomposite films was improved by incorporating inorganic AgNPs as a nanofiller in the films’ matrix to avoid bacterial growth. The results showed that the tensile strength ranged between 8 kPa and 408 kPa and the elasticity modulus was between 5.72 kPa and 9.86 kPa. The addition of AgNPs in FTIR analysis decreased the transmittance value, caused small changes in the chemical structure, caused small differences in the intensity peaks, and produced longer wavelengths. These active films increased the degradation weight and decomposition temperature due to the more heat-stable AgNPs. Meanwhile, the average inhibited areas measured were between 7.66 and 7.83 mm (Escherichia coli), 7.5 and 8.0 mm (Salmonella cholerasuis), and 0.1 and 0.5 mm for Staphylococcus aureus. From the microscopic analysis, it was observed that the average size of all microbes for 1 wt% and 4 wt% AgNPs ranged from 0.57 to 2.90 mm. Overall, 3 wt% AgNP nanofiller was found to be the best composition that fulfilled all the mechanical properties and had better antimicrobial properties. Thus, the development of an organic-inorganic hybrid of antibacterial biopolymer composite films is suitable for antibacterial coatings.

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Preparation and Characterization of Ultrasound Treated Polyvinyl Alcohol/Chitosan/DMC Antimicrobial Films

Coatings ◽

10.3390/coatings9090582 ◽

2019 ◽

Vol 9 (9) ◽

pp. 582 ◽

Cited By ~ 3

Author(s):

Rui Li ◽

Yue Wang ◽

Jie Xu ◽

Saeed Ahmed ◽

Yaowen Liu

Keyword(s):

Composite Films ◽

Antibacterial Properties ◽

Light Transmittance ◽

Poly Vinyl Alcohol ◽

Trimethyl Ammonium Chloride ◽

Material Characteristic ◽

Polymer Blending ◽

Active Materials ◽

Blending Method

In this research, chitosan (CS) and poly (vinyl alcohol) (PVA) were adopted as a material, methacryloyloxyethyl trimethyl ammonium chloride (DMC) was added in various concentrations and was treated ultrasonically for the formation of films with the use of the polymer blending method. The influences exerted by the ultrasonication period on PVA/CS/DMC antimicrobial active materials underwent material characteristic tests. The consequences revealed that at the break of the compound films, ultrasonication raised the elongation and tensile strength on the whole. Ultrasonication further or also enhanced the light transmittance performance and composite films’ barrier property. Furthermore, the compound film with a DMC concentration of 2% had good antibacterial properties, the film’s inhibition rates against Staphylococcus aureus and Escherichia coli after ultrasonication were 79.23% ± 1.92% and 72.31% ± 1.35%, respectively.

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Synthesis and Characterization of Silver Nanoparticles on Orthodontic Brackets: A New Alternative in the Prevention of White Spots

Coatings ◽

10.3390/coatings9080480 ◽

2019 ◽

Vol 9 (8) ◽

pp. 480

Author(s):

Irania Jasso-Ruiz ◽

Ulises Velazquez-Enriquez ◽

Rogelio José Scougall-Vilchis ◽

Edith Lara-Carrillo ◽

Victor Hugo Toral-Rizo ◽

...

Keyword(s):

Electron Microscopy ◽

Silver Nanoparticles ◽

Antibacterial Properties ◽

Antimicrobial Effect ◽

Orthodontic Brackets ◽

Synthesis And Characterization ◽

Human Pathogens ◽

Transmission Electron ◽

White Spots

Silver nanoparticles (AgNPs) are used for their powerful antibacterial effect and their ability to adhere to surfaces due to their size; they are used in different areas of life, mainly in the area of health as medicine. More recently, in dentistry, the synthesis and characterization of AgNPs attracted significant attention due to their antibacterial properties. In this study, the AgNPs were synthesized using the most effective method on different orthodontic brackets (metallic and esthetic) and characterized by scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and transmission electron microscopy (TEM). Their antimicrobial effect was tested against the widely used standard human pathogens Staphylococcus aureus (Gram-negative) and Escherichia coli (Gram-positive). Our results showed that, via a simple chemical method, AgNPs can be synthesized on the surface of orthodontic brackets with good antimicrobial activity and the possibility of reducing dental decay, periodontal disease and white spots generated during orthodontic treatment.

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Synthesis and characterization of silver nanoparticles-doped hydroxyapatite/alginate microparticles with promising cytocompatibility and antibacterial properties

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2019.124081 ◽

2020 ◽

Vol 585 ◽

pp. 124081 ◽

Cited By ~ 16

Author(s):

Qiuju Zhou ◽

Tianwen Wang ◽

Can Wang ◽

Zheng Wang ◽

Yanan Yang ◽

...

Keyword(s):

Silver Nanoparticles ◽

Antibacterial Properties ◽

Synthesis And Characterization

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Sargassum Influx on the Mexican Coast: A Source for Synthesizing Silver Nanoparticles with Catalytic and Antibacterial Properties

Applied Sciences ◽

10.3390/app11104638 ◽

2021 ◽

Vol 11 (10) ◽

pp. 4638

Author(s):

Jose Luis López-Miranda ◽

Rodrigo Esparza ◽

Marlen Alexis González-Reyna ◽

Beatriz Liliana España-Sánchez ◽

Angel Ramon Hernandez-Martinez ◽

...

Keyword(s):

Particle Size ◽

Silver Nanoparticles ◽

Average Particle Size ◽

Antibacterial Properties ◽

Average Particle ◽

X Ray Diffraction ◽

X Ray ◽

Experimental Parameters ◽

First Time

This work reports, for the first time, the synthesis of silver nanoparticles using extracts of the species of Sargassum natans and Sargassum fluitans (AgNPs-S). Their antibacterial and catalytic properties are compared with silver nanoparticles obtained by chemical synthesis (AgNPs-C). The characterization of AgNPs-S and AgNPs-C was carried out using ultraviolet–visible spectroscopy (UV–Vis), dynamic light scattering (DLS), zeta potential, a scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis. The synthesis of silver nanoparticles using Sargassum extract was optimized through varying experimental parameters, such as the type of solvent used to prepare the extract, the volume of the extract, and the pH of the system. The most efficient sample (AgNPs-S) was prepared with a water–ethanol-based extract, using a 3:1 volumetric ratio of extract: a precursor salt with the addition of 1 mL of NaOH pH = 14. The AgNPs-C were spherical in shape, with an average particle size of 11.55 nm, while the AgNPs-S were polyhedral shaped, with an average particle size of 26.39 nm. The synthesized AgNPs-S were found to have significantly higher catalytic activity for the degradation of methylene blue and more effective antibacterial activity against Staphylococcus aureus and Pseudomonas aeruginosa than AgNPs-C.

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Preparation and Characterization of KGM /TiO2 Composite Membrane

Materials Science Forum ◽

10.4028/www.scientific.net/msf.569.353 ◽

2008 ◽

Vol 569 ◽

pp. 353-356 ◽

Cited By ~ 1

Author(s):

Xiu Rong Zhuo ◽

Xue Gang Luo ◽

Xiao Yan Lin ◽

Yan Chen ◽

Chang Gang Xu

Keyword(s):

Tensile Strength ◽

Composite Membrane ◽

Composite Films ◽

Antibacterial Properties ◽

Composite Membranes ◽

Glycerol Content ◽

Titania Particle ◽

Structure And Morphology ◽

Hydrogen Bonding Interactions

TiO2 / KGM composite membranes were prepared by blend. Effects of the content of TiO2 and glycerol, ratio of PVA to KGM on tensile strength of membranes were investigated. Structure and Morphology of TiO2 / KGM films were characterized by SEM, XRD and IR. Furthermore, anti-bacteria properties of composite films were evaluated. The results showed that there were hydrogen bonding interactions between konjac glucomannan molecule, PVA and titania particle after irradiation. Composite membranes enable the antibacterial properties improved by adding an appropriate amount of TiO2, but mechanical properties decreased. The composite membrane tensile strength decreased with increasing glycerol content but increased with PVA glucomannuronate composite ratio increasing.

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