Green silver nanoparticles as a multifunctional sensor for toxic Cd(ii) ions

2018 ◽  
Vol 42 (18) ◽  
pp. 15022-15031 ◽  
Author(s):  
Archana Aravind ◽  
Maria Sebastian ◽  
Beena Mathew
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Environmental Samples ◽  
Allium Sativum ◽  
Limit Of Detection ◽  
Electrochemical Sensing ◽  
Optical Fluorescence ◽  
Multifunctional Sensor

Silver nanoparticles (AgNPs) were synthesized using Allium sativum (AS) extract. The AgNP-AS was able to detect Cd(ii) ions with various techniques such as optical, fluorescence and electrochemical sensing. The limit of detection was found to be 0.277 μM. Silver nanoparticles were able to quantify Cd(ii) ions from environmental samples. The antibacterial activity of AgNP-AS was explored towards waterborne bacteria.

Green synthesized unmodified silver nanoparticles as a multi-sensor for Cr(iii) ions

2018 ◽  
Vol 4 (10) ◽  
pp. 1531-1542 ◽  
Author(s):  
Archana Aravind ◽  
Maria Sebastian ◽  
Beena Mathew
Keyword(s):  
Silver Nanoparticles ◽  
Lycopersicon Esculentum ◽  
Surface Functionalization ◽  
Electrochemical Sensing ◽  
Green Method ◽  
Optical Fluorescence

In this work we present optical, fluorescence and electrochemical sensing of Cr(iii) ions using silver nanoparticles (AgNPs) synthesized by a green method using Lycopersicon esculentum (LE) extract without any surface functionalization.

scholarly journals Silver Nanoparticles Supported Graphitic Like Carbon Nitride for the Electrochemical Sensing of Nitrobenzene and its Derivatives

2021 ◽  
Author(s):  
Pandiyarajan C ◽  
Rameshkumar Perumal ◽  
Murugesan S ◽  
Selvaraj M
Keyword(s):  
Silver Nanoparticles ◽  
Carbon Nitride ◽  
Limit Of Detection ◽  
Electrochemical Techniques ◽  
Graphitic Carbon ◽  
Electrochemical Sensing ◽  
Graphitic Carbon Nitride ◽  
Transmission Electron ◽  
Low Concentrations ◽  
Ft Ir

Abstract Nitrobenzene (NB) is toxic even at low concentrations and hence, its contamination in the environment is a pervasive concern. The electrochemical techniques have emerged as rosy method to sense and degrade NB and graphitic carbon nitride (g-C3N4) catalysts are found to be promising for this. In this study, silver nanoparticles (AgNPs) decorated N-[3-(trimethoxysilyl)propyl]ethylenediamine (EDAS) modified graphitic carbon nitride nanocomposites (EDAS/(g-C3N4-Ag)NC) having various silver concentrations are prepared through a facile method and applied for the electrochemical sensing of NB derivatives. UV-vis absorption edge at 430 nm together with a broad surface plasmon resonance (SPR) peak at 450 nm indicates the existence of AgNPs on the g-C3N4 nanosheets. FT-IR spectra endorse the presence of g-C3N4 nanosheets in the composite. The presence of Ag in EDAS/(g-C3N4-Ag)NC is confirmed by transmission electron microscopy, energy dispersive X-ray analysis and cyclic voltammetry (CV). The nanocomposite prepared with 2 mM Ag+ shows superb electrocatalytic activity towards the reduction of nitrobenzene and its derivatives. Sensitivity of the modified electrode and limit of detection (LOD) for NB assessed by square wave voltammetry are found to be 0.594 A M− 1 cm− 2 and 2 µM, respectively, in the linear range of 5–50 µM.

Antibacterial Activity of Biodegradable Particles based on Chitosan Containing Colloidal Silver

2020 ◽  
Vol 36 (4) ◽  
pp. 87-93
Author(s):  
V.Yu. Reshetova ◽  
A.F. Krivoshchepov ◽  
I.A. Butorova ◽  
N.B. Feldman ◽  
S.V. Lutsenko ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Polymer Matrix ◽  
Adipic Acid ◽  
Antibacterial Effect ◽  
Academic Excellence ◽  
Colloidal Silver ◽  
Scanning Electron Microscopy Data ◽  
Covalent Bonds ◽  
Agar Diffusion Test

Chitosan beads with colloidal silver nanoparticles inclued in the polymer matrix have been obtained by the introduction of chitosan into an acidified nanosilver sol. Dual interconnection of drops of the resulting solution was then carried out by ionotropic gelation at the first stage and covalent crosslinking of the polymer matrix with adipic acid at the second stage. The surface morphology of the obtained beads was studied by scanning electron microscopy. Data of Fourier transform IR spectroscopy confirmed the formation of covalent bonds between chitosan and adipic acid. The antibacterial activity of obtained beads against S. aureus and E. coli was evaluated using agar diffusion test. It was shown that the сhitosan beads modified with nanostructured silver exhibited an antibacterial effect against the tested strains, and they can be used as a basis for creating biodegradable wound healing dressings with a prolonged antibacterial effect. chitosan, silver nanoparticles, antibacterial activity, wound dressings This work was supported by the "Russian Academic Excellence Project 5-100". The study was carried out with the financial support of the Russian Foundation for Basic Research in the framework of the Scientific Project no. 18-29-18039.

Green Synthesis of Silver Nanoparticles Using Artocarpus hirsutus Seed Extract and its Antibacterial Activity

2020 ◽  
Vol 21 (10) ◽  
pp. 980-989
Author(s):  
Sampath Shobana ◽  
Sunderam Veena ◽  
S.S.M. Sameer ◽  
K. Swarnalakshmi ◽  
L.A. Vishal
Keyword(s):  
Silver Nanoparticles ◽  
Cell Wall ◽  
Antibacterial Activity ◽  
Listeria Monocytogenes ◽  
Nanoparticle Synthesis ◽  
Enterobacter Aerogenes ◽  
Seed Extract ◽  
Diffusion Method ◽  
Multi Drug Resistance ◽  
Gastrointestinal Bacteria

Aims: To evaluate the antibacterial activity of Artocarpus hirsutus mediated seed extract for nanoparticle synthesis. Background: Gastrointestinal bacteria are known for causing deadly infections in humans. They also possess multi-drug resistance and interfere with clinical treatments. Applied nanotechnology has been known to combat such infectious agents with little interference from their special attributes. Here we synthesize silver nanoparticles from Artocarpus hirsutus seed extract against two gastro-intestinal bacterial species: Enterobacter aerogenes and Listeria monocytogenes. Objective: To collect, dry, and process seeds of Artocarpus hirsutus for nanoparticle synthesis. To evaluate the morphological interaction of silver nanoparticles with bacteria. Methods: Artocarpus hirsutus seeds were collected and processed and further silver nanoparticles were synthesized by the co-precipitation method. The synthesized nanoparticles were characterized using XRD, UV, FTIR, and SEM. These nanoparticles were employed to study the antibacterial activity of nanoparticles against Enterobacter aerogenes and Listeria monocytogenes using well diffusion method. Further, morphological interaction of silver nanoparticles on bacteria was studied using SEM. Result: Silver nanoparticles were synthesized using Artocarpus hirsutus seed extract and characterization studies confirmed that silver nanoparticles were spherical in shape with 25-40 nm size. Antibacterial study exhibited better activity against Enterobacter aerogenes with a maximum zone of inhibition than on Listeria monocytogenes. SEM micrographs indicated that Enterobacter aerogenes bacteria were more susceptible to silver nanoparticles due to the absence of cell wall. Also, the size and charge of silver nanoparticles enable easy penetration of the bacterial cell wall. Conclusion: In this study, silver nanoparticles were synthesized using the seed extract of Artocarpus hirsutus for the first time exploiting the fact that Moraceae species have high phytonutrient content which aided in nanoparticle synthesis. This nanoparticle can be employed for large scale synthesis which when coupled with the pharmaceutical industry can be used to overcome the problems associated with conventional antibiotics to treat gastrointestinal bacteria.

Antibacterial activity of garlic extract and silver Nanoparticles: an in vitro analysis

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
SHREYASHI M ◽  
SULAGNA D ◽  
SANKARI D ◽  
THIRUMURUGAN D ◽  
INFANT SANTHOSE B ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Garlic Extract ◽  
Vitro Analysis ◽  
In Vitro Analysis

scholarly journals Simultaneous electrochemical sensing of dihydroxy benzene isomers at cost-effective allura red polymeric film modified glassy carbon electrode

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Pattan-Siddappa Ganesh ◽  
Ganesh Shimoga ◽  
Seok-Han Lee ◽  
Sang-Youn Kim ◽  
Eno E. Ebenso
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Tap Water ◽  
Differential Pulse ◽  
Oxidation Potential ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Allura Red

Abstract Background A simple and simultaneous electrochemical sensing platform was fabricated by electropolymerization of allura red on glassy carbon electrode (GCE) for the interference-free detection of dihydroxy benzene isomers. Methods The modified working electrode was characterized by electrochemical and field emission scanning electron microscopy methods. The modified electrode showed excellent electrocatalytic activity for the electrooxidation of catechol (CC) and hydroquinone (HQ) at physiological pH of 7.4 by cyclic voltammetric (CV) and differential pulse voltammetric (DPV) techniques. Results The effective split in the overlapped oxidation signal of CC and HQ was achieved in a binary mixture with peak to peak separation of 0.102 V and 0.103 V by CV and DPV techniques. The electrode kinetics was found to be adsorption-controlled. The oxidation potential directly depends on the pH of the buffer solution, and it witnessed the transfer of equal number of protons and electrons in the redox phenomenon. Conclusions The limit of detection (LOD) for CC and HQ was calculated to be 0.126 μM and 0.132 μM in the linear range of 0 to 80.0 μM and 0 to 110.0 μM, respectively, by ultra-sensitive DPV technique. The practical applicability of the proposed sensor was evaluated for tap water sample analysis, and good recovery rates were observed. Graphical abstract Electrocatalytic interaction of ALR/GCE with dihydroxy benzene isomers.

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