scholarly journals Microfibrillated Cellulose-silver Nanocomposite Based PVA Hydrogels and Their Enhanced Physical, Mechanical and Antibacterial Properties

2022 ◽  
Author(s):  
Md. Shamsul Alam ◽  
Md. Sabbir Hasan ◽  
Jannat Al Foisal ◽  
G. M. Arifuzzaman Khan ◽  
Rownok Jahan ◽  
...  
Keyword(s):  
Antibacterial Properties ◽  
Multidrug Resistant ◽  
Microfibrillated Cellulose ◽  
Visible Spectroscopy ◽  
Silver Nanocomposites ◽  
Potential Applications ◽  
Silver Nanocomposite ◽  
Uv Visible ◽  
Thermal Stability Of ◽  
Pva Hydrogel

Abstract Modification of cellulose with silver nanoparticles produces various nanocomposites with significantly developed properties. This work aims to prepare a PVA hydrogel modified with cellulose/silver nanocomposites having potential applications in various fields including biomedical, antimicrobial inhibition, textile wears, etc. Microfibrillated cellulose/silver nanocomposites hydrogels were prepared in the aqueous medium with aid of microwave-assisted heating. Different percentages of nanocomposites were incorporated in PVA hydrogel to enhance the properties of PVA hydrogel. Prepared products were characterized by UV-Visible spectroscopy, FTIR, TGA, XRD, and SEM. The swelling (in water saline, acidic and alkaline solution), tensile, thermal, and antibacterial properties were also examined. The formation of Ag nanoparticles (AgNPs) in the (MFC-Ag) NC was confirmed by XRD and UV–Vis spectra. UV–Vis spectra showed the characteristic peaks of Ag in the UV–Vis spectra at 425 nm. Final products exhibited significant porosity and maximum swelling of 519.44%. The thermal stability of hydrogel increased with an increased percentage of (MFC-Ag)NC. Hydrogels exhibited significant antimicrobial inhibition against multidrug-resistant microorganisms, including Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa.

scholarly journals Green synthesis of silk sericin-embedded silver nanoparticles and their antibacterial application against multidrug-resistant pathogens

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Md. Abdullah Al Masud ◽  
Hamid Shaikh ◽  
Md. Shamsul Alam ◽  
M. Minnatul Karim ◽  
M. Abdul Momin ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Bombyx Mori ◽  
Multidrug Resistant ◽  
Visible Spectroscopy ◽  
Silk Sericin ◽  
X Ray ◽  
Synthesis Strategy ◽  
Uv Visible ◽  
Multidrug Resistant Pathogens

Abstract Background The green synthesis strategy of metallic nanoparticles (NPs) has become popular due to being environmentally friendly. Stable silver nanoparticles (AgNPs) have been synthesized by natural products such as starch, soy protein, various extract of leaves, barks, and roots functioning both as reducing and stabilizing agents. Likewise, silk sericin (SS) is a globular protein discarded in the silk factory might be used for NP synthesis. In this research, we focus on the green synthesis and stabilization of AgNPs by SS as well as assessment of their antibacterial activities against some drug-resistant pathogen. Results SS was extracted from Bombyx mori silkworm cocoons in an aqueous medium. 17 w/w% of dry sericin powder with respect to the cocoon’s weight was obtained by freeze-drying. Furthermore, AgNPs conjugated to sericin, i.e., SS-capped silver nanoparticles (SS-AgNPs) were synthesized by easy, cost-effective, and environment-friendly methods. The synthesized SS-AgNPs were characterized by UV-visible spectroscopy, Fourier-transform infrared-attenuated total reflection (FTIR-ATR) spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction measurement. It has been found from the absorbance of UV-visible spectroscopy that a higher percent of SS-AgNPs was obtained at a higher concentration of silver nitrate solution. FTIR-ATR spectra showed that the carboxylate groups obtained from silk sericin act as a reducing agent for the synthesis of silver nanoparticles, while NH2+ and COO− act as a stabilizer of AgNPs. The X-ray diffractogram of SS-AgNPs was quite different from AgNO3 and sericin due to a change in the crystal structure. The diameter of AgNPs was around 20–70 nm observed using TEM. The synthesized SS-AgNPs exhibited strong antibacterial activity against multidrug-resistant pathogens, Escherichia coli and Pseudomonas aeruginosa. Minimal inhibitory/bactericidal concentrations against E. coli and P. aeruginosa were 20μg/mL. Conclusions This study encourages the use of Bombyx mori for the ecofriendly synthesis of SS-AgNPs to control multidrug-resistant microorganisms.

scholarly journals Synthesis of Eco-Friendly Silver Nanoparticles from Securidaca Longepedunculata and Artocarpus Heterophyllus Powders and Evaluation of their Antibacterial Properties

2019 ◽  
Vol 1 ◽  
pp. 114-121
Author(s):  
B A Ikyenge ◽  
I G Agbidye ◽  
F R Idoko ◽  
S O Adoga
Keyword(s):  
Silver Nanoparticles ◽  
Cardiac Glycosides ◽  
Antibacterial Properties ◽  
Colloidal Solutions ◽  
Visible Spectroscopy ◽  
Positive Bacterium ◽  
Infra Red ◽  
Uv Visible ◽  
The Fourier Transform ◽  
Securidaca Longepedunculata

Aqueous extracts of Securidacalongepedunculata and Artocarpusheterophyllus were screened for photochemicals and both were found to contain saponins, tannins, flavonoid, cardiac glycosides, anthraquinones and alkaloids. Biosynthesis of silver nanoparticles was carried out from these extracts. The formation and stability of the reduced nanoparticles in the colloidal solutions were monitored using UV-visible spectroscopy. The Fourier transform infra-red spectroscopy (FTIR), indicated the presence of bio-molecules responsible for reduction and stabilization of the nanoparticles. The morphology of the nanoparticles formed from Securidacalongepedunculata was flake like and that from Artocarpusheterophyllus was plate-like as shown by scanning electron microscopy (SEM). The nanoparticles from both plants showed potent anti-bacterial activities towards Staphylococcus aureus, a gram positive bacterium.

scholarly journals Preparation of polyaniline-polyvinyl alcohol-silver nanocomposite and characterization of its mechanical and antibacterial properties

2018 ◽  
Vol 25 (5) ◽  
pp. 975-982 ◽  
Author(s):  
Alireza Khoshkbar Sadeghi ◽  
Maryam Farbodi
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Polyvinyl Alcohol ◽  
Nanocomposite Film ◽  
Antibacterial Properties ◽  
Composition And Structure ◽  
Reinforcing Agent ◽  
Silver Nanocomposite ◽  
Thermal Stability Of

AbstractIn the present research, polyaniline is used as a conducting polymer and polyvinyl alcohol is also used as a biopolymer, because of its mechanical properties and suitable processability. Also, silver nanoparticles are considered as a reinforcing agent of thermal stability, mechanical and antibacterial properties to prepare polyaniline-polyvinyl alcohol-silver nanocomposite. The synthesis of polyaniline-polyvinyl alcohol composite and polyaniline-polyvinyl alcohol-silver nanocomposite is performed through addition of polyaniline and silver in polyvinyl alcohol solution. In order to review thermal, mechanical and antibacterial properties of synthesized composite and nanocomposites, components with different weight rates are used. The obtained results from thermogravimetric analysis (TGA) tests also indicate promotion of thermal stability of polyaniline-polyvinyl alcohol-silver nanocomposite compared with pure polyvinyl alcohol in temperatures above 400°C. The results of Fourier-transform infrared (FTIR) spectroscopy revealed the presence of polyaniline, polyvinyl alcohol and silver in the structure of polyaniline-polyvinyl alcohol-silver triple nanocomposite film. The obtained results from a review of antibacterial properties showed that polyaniline-polyvinyl alcohol-silver nanocomposites have antibacterial effects on two different types of Gram-positive and Gram-negative bacteria. The obtained results from a review of mechanical properties of nanocomposites showed that the greatest value of tensile strength (13.8 MPa) belonged to polyaniline-polyvinyl alcohol-silver (88%/9%/3% w/w) nanocomposites. Therefore, this is determined as an optimal triple nanocomposite. In addition, scanning electron microscopy (SEM) coupled with an energy dispersive X-ray (EDX) system was used to characterize the composition and structure of polyaniline-polyvinyl alcohol-silver nanocomposite film.

scholarly journals Preparation and Characterization of P-TSA Doped Tetraaniline NanorodsviaMicellar-Assisted Method

2012 ◽  
Vol 9 (3) ◽  
pp. 1175-1180 ◽  
Author(s):  
K. Basavaiah ◽  
A. V. Prasada Rao
Keyword(s):  
Electron Microscopy ◽  
Spectroscopic Data ◽  
Visible Spectroscopy ◽  
Molar Ratios ◽  
Ft Raman Spectroscopy ◽  
Uv Visible ◽  
Thermal Stability Of ◽  
Scanning Electron ◽  
Ft Raman

In this work, we report preparation and characterization of P-toluene sulphonic acid (P-TSA) doped tetraaniline nanorods by micellar assisted method using ammonium per sulphate (APS) as an oxidant. Here, PTSA acts as dopant as well as template for tetraaniline nanostructures. The synthesized tetraaniline nanorods have been well characterized by Fourier transform infrared spectroscopy (FTIR), FT Raman spectroscopy, UV-Visible spectroscopy (UV-Visible), Scanning electron microscopy (SEM) and thermogravimetry. The morphologies of tetraaniline were found to be dependent on molar ratios of N-phenyl-1, 4-phenylenediamine (NPPD) to PTSA. The spectroscopic data indicated that PTSA doped tetraaniline nanorods. Thermogravimetry studies revealed that the PTSA doping improved the thermal stability of tetraaniline nanorods.

scholarly journals A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

RSC Advances ◽  
2021 ◽  
Vol 11 (48) ◽  
pp. 30156-30171
Author(s):  
William Xaveriano Waresindo ◽  
Halida Rahmi Luthfianti ◽  
Dhewa Edikresnha ◽  
Tri Suciati ◽  
Fatimah Arofiati Noor ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Polyvinyl Alcohol ◽  
Wound Dressing ◽  
Leaf Extract ◽  
Antibacterial Properties ◽  
Freeze Thaw ◽  
Good Antibacterial Activity ◽  
Potential Applications ◽  
Guava Leaf ◽  
Pva Hydrogel

A polyvinyl alcohol (PVA) hydrogel loaded with guava leaf extract (GLE) has potential applications as a wound dressing with good antibacterial activity.

scholarly journals Enhanced Thermal Conductivity and Superior Antimicrobial Activity by Cu/Ni Nanofiber Dispersed Fluids with Prolonged Stability

2019 ◽  
Vol 9 (2) ◽  
pp. 4950-4953
Keyword(s):  
Thermal Conductivity ◽  
Inhibitory Concentration ◽  
Imaging Techniques ◽  
Antibacterial Properties ◽  
Zone Of Inhibition ◽  
Visible Spectroscopy ◽  
Synthesis Parameters ◽  
Uv Visible ◽  
The Stability ◽  
Inhibition Analysis

The present study reports the synthesis, characterization and antibacterial properties of Cu/Ni nanofluids. The influence of various synthesis parameters on the stability of nano suspensions were studied and optimized. The samples were characterized using UV-Visible spectroscopy and TEM imaging techniques. The TEM images revealed the formation of nanofibers. The optimized composition of the Cu/Ni nanofluid was found to be stable for more than four months with zeta potential value of 40.4mV. The thermal conductivity studies showed 19% enhancement in comparison to the base fluid (water). The antibacterial properties of the nanosuspensions were studied by performing minimum inhibitory concentration tests (MIC) and zone of inhibition analysis.

scholarly journals Synthesis and Characterization of Dodecylbenzene Sulfonic Acid doped Tetraaniline via Emulsion Polymerization

2012 ◽  
Vol 9 (3) ◽  
pp. 1342-1346 ◽  
Author(s):  
K. Basavaiah ◽  
K. Tirumala Rao ◽  
A. V. Prasada Rao
Keyword(s):  
Sulfonic Acid ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Molar Ratios ◽  
Uv Visible ◽  
Dodecylbenzene Sulfonic Acid ◽  
Diffraction Patterns ◽  
Thermal Stability Of

In this work, we report preparation and characterization of dodecylbenzene sulfonic acid (DBSA) doped tetraaniline via micelles assisted method using ammonium per sulphate (APS) as an oxidant. Here, DBSA act as dopant as well as template for tetraaniline nanostructures. The synthesized DBSA doped tetraaniline have been well characterized by X-ray diffraction patterns, Fourier transform infrared spectroscopy, UV-Visible spectroscopy, Scanning electron microscopy and thermogravimetry. The morphologies of tetraaniline were found to be dependent on molar ratios of N-phenyl-1, 4-phenylenediamine to DBSA. The spectroscopic data indicated that DBSA doped tetraaniline. Thermogravimetry studies revealed that the DBSA doping improved the thermal stability of tetraaniline.

scholarly journals Unveiling the Influence of Non-Toxic Fluorinated Ionic Liquids Aqueous Solutions in the Encapsulation and Stability of Lysozyme

2021 ◽  
Vol 2 (1) ◽  
pp. 149-166
Author(s):  
Margarida L. Ferreira ◽  
Nicole S. M. Vieira ◽  
João M. M. Araújo ◽  
Ana B. Pereiro
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Aqueous Solutions ◽  
Encapsulation Efficiency ◽  
Food Science ◽  
Colloidal Systems ◽  
Visible Spectroscopy ◽  
Surface Active ◽  
Uv Visible ◽  
Thermal Stability Of

Proteins are bioactive compounds with high potential to be applied in the biopharmaceutical industry, food science and as biocatalysts. However, protein stability is very difficult to maintain outside of the native environment, which hinders their applications. Fluorinated ionic liquids (FILs) are a promising family of surface-active ionic liquids (SAILs) that have an amphiphilic behavior and the ability to self-aggregate in aqueous solutions by the formation of colloidal systems. In this work, the protein lysozyme was selected to infer on the influence of FILs in its stability and activity. Then, the cytotoxicity of FILs was determined to evaluate their biocompatibility, concluding that the selected compounds have neglected cytotoxicity. Therefore, UV–visible spectroscopy was used to infer the FIL-lysozyme interactions, concluding that the predominant interaction is the encapsulation of the lysozyme by FILs. The encapsulation efficiency was also tested, which highly depends on the concentration and anion of FIL. Finally, the bioactivity and thermal stability of lysozyme were evaluated, and the encapsulated lysozyme keeps its activity and thermal stability, concluding that FILs can be a potential stabilizer to be used in protein-based delivery systems.

scholarly journals Partial characterization and the evaluation of antimicrobial activities of silver nanoparticles biosynthesized from Cymbopogon citratus leaf extract

2021 ◽  
Author(s):  
S M Rakib-Uz-Zaman ◽  
Mohammed Nimeree Muntasir ◽  
Ehsanul Hoque Apu ◽  
Sadrina Afrin Mowna ◽  
Mst Gitika Khanom ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Green Chemistry ◽  
Surface Plasmon ◽  
Multidrug Resistant ◽  
Resistant Bacteria ◽  
Cymbopogon Citratus ◽  
Visible Spectroscopy ◽  
Multidrug Resistant Bacteria ◽  
Uv Visible

Background: Silver nanoparticles (AgNPs) are toxic to microorganisms and can potentially kill multidrug-resistant bacteria. Nanoparticles can be synthesized in many different ways, such as physical or chemical methods. Recently, it has been found that plant molecules can perform the same reduction reactions necessary for the production of nanoparticles but in a much more efficient way. Results: Here, green chemistry was employed to synthesize silver nanoparticles using leaf extracts of Cymbopogon citratus. Effects of different parameters such as temperature, pH and volume of plant extract were also tested using their absorbance pattern at different wavelengths. The Surface Plasmon Resonance (SPR) changed with the changes in parameters. Changes in temperature from 20°C to 60°C have changed the highest absorbance from 0.972 to 3.893 with an SPR of 470 nm. At higher pH (11.1), the particles become highly unstable and have irregular shapes and sizes. At lower pH (3.97), the peak shifts to the right, indicating a smaller but unstable compound. We have also investigated the effect of the volume of plant extracts on the reaction time. The sample with the highest amount of plant extract showed the most absorbance with a value of 0.963 at λmax, which was calculated to be 470 nm. The total formation of the AgNPs was observed visually with a color change from yellow to brownish-black. UV-visible spectroscopy was used to monitor the quantitative formation of silver nanoparticles, showing a signature peak in absorbance between 400 and 500 nm. We have estimated the size of the nanoparticles as 47nm by comparing the experimental data with the theoretical value using Mieplot. The biosynthesized silver nanoparticles showed enhanced antibacterial activity against several multidrug-resistant bacteria, determined based on the minimal inhibitory concentration and zone of inhibition. Conclusion: The findings of this study indicate that an aqueous extract of C. citratus can synthesize silver nanoparticles when silver nitrate is used as a precursor and silver nanoparticles act as antimicrobial properties enhancers. These findings can influence further studies in this field to better understand the properties and applications of nanoparticles. Keywords: Silver nanoparticles, Plant extracts, Antimicrobial activity, Green chemistry, Optimization of parameters, Biosynthesis, Surface Plasmon Resonance, UV visible spectroscopy, Size estimation, Cymbopogon citratus

scholarly journals Green Synthesis of Ag Nanoparticles from Aqueous Extracts of Leaves and Fruit of Casuarina equisetifolia against Candida albicans and other Clinical Isolates

2021 ◽  
Vol 25 (01) ◽  
pp. 117-122
Author(s):  
Mahmoud Moustafa,
Keyword(s):  
Candida Albicans ◽  
Inhibition Zone ◽  
Multidrug Resistant ◽  
Maximum Activity ◽  
Casuarina Equisetifolia ◽  
Visible Spectroscopy ◽  
Natural Agents ◽  
Silver Nps ◽  
Uv Visible ◽  
Natural Drugs

The prevalence of the infectious diseases caused by Candida species and other human pathogenic microbes has led to the discovery of some natural agents against multidrug resistant microbes. Therefore, this research was designated to determine the capability of synthesized nanoparticles (NPs) from aqueous extract of leaves and fruits of Casuarina equisetifolia as anticandidal and antibacterial against some microbes. Silver NPs (AgNPs) were successfully gained from aqueous leaves and fruit extracts of C. equisetifolia which is defined on the basis of UV–visible spectroscopy, X-ray diffraction analysis and scanning electron microscope. The results showed that leaves and fruits extracts of C. equisetifolia acts as an excellent capping agent. XRD based on the FWHM analysis showed that AgCl and Ag had an average NPs size of 90.97 nm and 71.28 nm, respectively for fruits and 15.33 nm and 14.01 nm, respectively for leaves. UV–visible spectroscopy showed a maximum absorbance at 442 nm for fruits and 433 nm for leaves. SEM showed that the size of NPs from leaves lied in between of (30 to180 nm) and for fruits (70 to 250 nm). Candida albicans was severely affected by NPs of leaves with inhibition zone (3.03± 1.61 cm) and NPs of fruits had (1.37± 0.15 cm) inhibition zone. Nanoparticles from leaves exhibited maximum activity against P. mirabilis (3.52± 0.13 cm) and low activities against M. luteus (1.50±0.18 cm) inhibition zones. In conclusion, these eco-friendly synthesized AgNPs from leaves and fruits of C. equisetifolia could be used as competitive alternative natural drugs than conventional synthetic chemicals. © 2021 Friends Science Publishers

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