scholarly journals Microwave Assisted Green Synthesis of Silver Nanoparticles using Pomegranate Peel Extract: Characterization and Antibacterial Activity Studies

2019 ◽  
Vol 32 (2) ◽  
pp. 458-462
Author(s):  
Gugulothu Yaku ◽  
Bandi Rajkumar ◽  
T.V.D. Prasad Rao
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Low Cost ◽  
Diffusion Method ◽  
Microwave Assisted Synthesis ◽  
Pomegranate Peel ◽  
Stabilizing Agent ◽  
X Ray ◽  
Microwave Assisted ◽  
Pomegranate Peel Extract

In the present work, a simple and low cost and eco-friendly technique is applied for the microwave assisted synthesis of silver nanoparticles (AgNPs) using the extract of pomegranate peel wastes, which does not require any use of external stabilizing agent. The extract of pomegranates peelings waste served as a reducing as well as capping/stabilizing agent. The synthesized silver nanoparticles were characterized by using powder X-ray diffraction (XRD), transmission eelectron microscopy (TEM), FT-IR, UV-visible spectroscopy and scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDX). The stability of AgNPs was analyzed by zeta potential measurements. The antibacterial activity of synthesized AgNPs was also evaluated on six Gram-positive and Gram-negative bacteria using agar well diffusion method.

scholarly journals Optical characterization and concentration-dependent antibacterial activity of silver nanoparticles (AgNPs) using aqueous Melastoma malabathricum extract against Staphylococcus aureus

2020 ◽  
Vol 11 (4) ◽  
pp. 5382-5387
Author(s):  
Irshad Ul Haq Bhat ◽  
Maisarah Binti Alias
Keyword(s):  
Staphylococcus Aureus ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Functional Groups ◽  
Diffusion Method ◽  
Synthetic Approach ◽  
Potential Candidate ◽  
X Ray ◽  
Melastoma Malabathricum ◽  
Resonance Band

The approach towards green synthetic methods has been enormously encouraged to synthesise nanoparticles for various uses. In this study, the one-pot synthetic method was adapted to synthesise silver nanoparticles (AgNPs) using Melastoma malabathricum (M. malabathricum) aqueous extract. The formation of AgNPs was confirmed by observing the results obtained by optical characterisation methods. The plasma resonance band along with shoulder at 375 nm and 595 nm, respectively, in Uv-Visible spectra supported the conversion of silver (Ag) to AgNPs reduced by functional groups present in the plant extract. The size of AgNPs was 31 nm and cubic in shape as confirmed by X-ray diffractometry (XRD) using Scherer equation. X-Ray Fluorescence (XRF) results also confirmed the presence of silver. The FTIR characterisation confirmed the presence of reducing functional groups. The antibacterial activity of AgNPs against Staphylococcus aureus (S. aureus) was carried out by disc diffusion method with increasing concentration of AgNPs, and enhanced inhibition zone was observed. The AgNPs obtained can be further explored against different bacterial strains and can a potential candidate as an antibacterial agent using the green synthetic approach.

Synthesis of antibacterial silver–chitosan-modified bionanocomposites by RAFT polymerization and chemical reduction methods

2016 ◽  
Vol 49 (2) ◽  
pp. 173-193 ◽  
Author(s):  
Mojtaba Abbasian ◽  
Farideh Mahmoodzadeh
Keyword(s):  
Antibacterial Activity ◽  
Hybrid Materials ◽  
Chemical Reduction ◽  
Proton Nuclear Magnetic Resonance ◽  
Diffusion Method ◽  
Infrared Spectrometry ◽  
Resonance Spectroscopy ◽  
Ag Nps ◽  
Stabilizing Agent ◽  
X Ray

Chitosan (Cts) was first modified with 4-cyano,4-[(phenylcarbothioyl)sulfanyl]pentanoic acid to serve as reversible addition–fragmentation chain transfer (RAFT) agent, and then the controlled grafting polymerizations of acrylic acid (PAA) were performed. The resultant copolymers were used as a stabilizing agent for preparation of colloidal silver nanoparticles (Ag NPs) in the range of 2–10 nm. Afterwards, montmorillonites (MMTs) were added to the solution of colloidal Ag NPs for improving thermal stability. Proton nuclear magnetic resonance spectroscopy, Fourier transform infrared spectrometry, energy dispersive X-ray spectroscopy, X-ray diffraction analysis, and scanning electron microscopy images demonstrate the successful synthesis of the graft copolymer. Their thermal behavior was examined by differential scanning calorimetry and thermogravimetric analyses.The antibacterial activity of Ag/Cts-g-PAA and Ag/Cts-g-PAA/MMT was investigated against Staphylococcus aureus, Escherichia coli, and Candida albicans by the disc diffusion method using Mueller Hinton agar. Antimicrobial tests show that Ag/Cts-g-PAA has much higher antimicrobial activity than Ag/Cts-g-PAA/MMT. This method would enable a wide variety of molecular designs to afford novel types of tailored hybrid materials composed of natural polysaccharides and synthetic polymers. The new hybrid materials were used as a stabilizing agent for preparation of Ag bionanocomposites with good antibacterial activity.

Biogenic of silver nanoparticles using ayurveda tooth powder and its antibacterial activity of extended-spectrum beta-lactamases producing E.coli

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Abdullah A. Alarfajj ◽  
Mohammedsaleh Almallahi ◽  
Murugan A. Munusamy ◽  
Mickymaray Suresh ◽  
Wael Alturaiki
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Low Cost ◽  
Diffusion Method ◽  
Tem Analysis ◽  
Beta Lactamases ◽  
Extended Spectrum ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Extended Spectrum Beta Lactamases

Extended-spectrum beta-lactamases (ESBL) are enzymes produced by E. coli like some gram negative bacteria. The patients who are affected by ESBL producing bacteria facing a major problem and they may need different β- lactam antibiotics to treat the infection. But this extensive use of β- lactam antibiotics against ESPLs creating major public health threat.  As an alternative currently many eco- friendly, non-toxic, low cost nanoparticles are synthesizing by biogenic way used as an alternative for the β- lactam antibiotics. In the present study silver nanoparticles (AgNPs) were synthesized using Ayurveda Toothpowder. The synthesized AgNPs were characterized using ultraviolet (UV)-visible (vis) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscope (TEM) analysis and finally the antibacterial activity was performed against ESBL producing bacteria by well diffusion method. Antibacterial tests against ESPL producing E.coli cells using biogenic synthesized AgNPs showed significant antibacterial effect at low concentration of AgNPs. The results proved that the biogenic synthesised nanoparticles using Toothpowder extract would help to arrest ESBL producing bacteria a

scholarly journals GREEN SYNTHESIS, CHARACTERIZATION OF SILVER NANOPARTICLES OF A MARINE RED ALGA SPYRIDIA FUSIFORMIS AND THEIR ANTIBACTERIAL ACTIVITY

2017 ◽  
Vol 9 (5) ◽  
pp. 192 ◽  
Author(s):  
Subbiah Murugesan ◽  
Sundaresan Bhuvaneswari ◽  
Vajiravelu Sivamurugan
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Red Alga ◽  
Diffusion Method ◽  
Present System ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Uv Visible

Objective: In the present system, the green synthesis of silver nanoparticles using marine the red alga Spyridia fusiformis and antibacterial activity was carried out.Methods: The seaweed extract was used for the synthesis of AgNPs at room temperature. The silver nanoparticles were characterized by using UV–Visible spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscope and X-ray diffraction (XRD) techniques. The antibacterial activity of biosynthesized silver nanoparticles was carried out by disc diffusion method against pathogenic bacteria.Results: The UV-visible spectroscopy revealed surface plasmon resonance at 450 nm. The FT-IR measurements showed the possible functional groups responsible for the formation of nanoparticles. The X-ray diffraction analysis showed that the particles were crystalline in nature. TEM micrograph has shown the formation of silver nanoparticles with the size in the range of 5–50 nm. The silver nanoparticles synthesized from the S. fusiformis showed higher activity and proved their efficacy in controlling the pathogenic bacterial strains. The nanoparticles showed highest inhibition activity on K. pneumaniae and S. aureus up to 26 and 24±0.01 mm at 100 μg/ml of nanoparticles.Conclusion: The synthesised AgNPs have shown the best antibacterial activity against human pathogens E. coli, K. pneumoniae, S. aureus and P. aeruginosa. The above eco-friendly AgNPs synthesis procedure could be a viable solution for industrial applications in the future and therapeutic needs.

scholarly journals Evaluation of the antimicrobial activity of silver nanoparticles obtained by microwave-assisted green synthesis using Handroanthus impetiginosus (Mart. ex DC.) Mattos underbark extract

RSC Advances ◽  
2020 ◽  
Vol 10 (35) ◽  
pp. 20676-20681
Author(s):  
Renata Pascoal Illanes Tormena ◽  
Eliane Vieira Rosa ◽  
Bruna de Fátima Oliveira Mota ◽  
Juliano Alexandre Chaker ◽  
Christopher William Fagg ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Plant Extract ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Green Route ◽  
Low Toxicity ◽  
Handroanthus Impetiginosus

Silver nanoparticles with low toxicity and improved antibacterial activity are obtained by a green route using microwave-assisted synthesis with plant extract.

scholarly journals Silver Nanoparticles on Chitosan/Silica Nanofibers: Characterization and Antibacterial Activity

2019 ◽  
Vol 21 (1) ◽  
pp. 166 ◽  
Author(s):  
Małgorzata Zienkiewicz-Strzałka ◽  
Anna Deryło-Marczewska ◽  
Yury A. Skorik ◽  
Valentina A. Petrova ◽  
Adam Choma ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Low Cost ◽  
Physicochemical Characterization ◽  
Analytical Techniques ◽  
Electrospinning Technique ◽  
X Ray ◽  
Silica Phase ◽  
Silica Nanofibers

A simple, low-cost, and reproducible method for creating materials with even silver nanoparticles (AgNP) dispersion was established. Chitosan nanofibers with silica phase (CS/silica) were synthesized by an electrospinning technique to obtain highly porous 3D nanofiber scaffolds. Silver nanoparticles in the form of a well-dispersed metallic phase were synthesized in an external preparation step and embedded in the CS/silica nanofibers by deposition for obtaining chitosan nanofibers with silica phase decorated by silver nanoparticles (Ag/CS/silica). The antibacterial activity of investigated materials was tested using Gram-positive and Gram-negative bacteria. The results were compared with the properties of the nanocomposite without silver nanoparticles and a colloidal solution of AgNP. The minimum inhibitory concentration (MIC) of obtained AgNP against Staphylococcus aureus (S. aureus) ATCC25923 and Escherichia coli (E. coli) ATCC25922 was determined. The physicochemical characterization of Ag/CS/silica nanofibers using various analytical techniques, as well as the applicability of these techniques in the characterization of this type of nanocomposite, is presented. The resulting Ag/CS/silica nanocomposites (Ag/CS/silica nanofibers) were characterized by small angle X-ray scattering (SAXS), X-ray diffraction (XRD), and atomic force microscopy (AFM). The morphology of the AgNP in solution, both initial and extracted from composite, the properties of composites, the size, and crystallinity of the nanoparticles, and the characteristics of the chitosan fibers were determined by electron microscopy (SEM and TEM).

Sign in / Sign up

Export Citation Format

Share Document