Silver ions and silver nanoparticles in zeolite A composites for antibacterial activity

2014 ◽  
Vol 264 ◽  
pp. 418-422 ◽  
Author(s):  
Duangkamon Jiraroj ◽  
Sukkaneste Tungasmita ◽  
Duangamol N. Tungasmita
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Silver Ions ◽  
Zeolite A

scholarly journals Green Synthesis of Silver Nanoparticles using Salacca zalacca Extract as Reducing Agent and It’s Antibacterial Activity

2019 ◽  
Vol 31 (12) ◽  
pp. 2804-2810
Author(s):  
Anti Kolonial Prodjosantoso ◽  
Oktanio Sigit Prawoko ◽  
Maximus Pranjoto Utomo ◽  
Lis Permana Sari
Keyword(s):  
Escherichia Coli ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Staphylococcus Epidermidis ◽  
Silver Ions ◽  
Reduction Reaction ◽  
Face Centered Cubic ◽  
Gram Positive Bacteria ◽  
Transmission Electron ◽  
Face Centered

In this article, the synthesis of silver nanoparticles through a reduction reaction process using Salacca zalacca extract is reported. The AgNPs were characterized using X-ray diffraction, transmission electron microscopy, Fourier transform infrared and UV-visible spectrophotometry methods. The AgNPs antibacterial activity was determined against of Gram-positive bacteria (Staphylococcus epidermidis) and Gram-negative bacteria (Escherichia coli). The main functional groups contained in Salacca zalacca extract are carbonyl, hydroxyl and nitrile groups, which are believed to reduce the silver ions to metal. The surface plasmon resonance values of brownish red AgNPs are in the range of 410 nm to 460 nm. The structure of AgNPs is face centered cubic (FCC). The diameter of silver nanoparticles crystallite is 14.2 ± 2.6 nm. The AgNPs growth inhibition zones of Escherichia coli and Staphylococcus epidermidis are 9.6 mm and 9.2 mm, respectively.

scholarly journals A Green Approach to Synthesize Silver Nanoparticles in Starch-co-Poly(acrylamide) Hydrogels by Tridax procumbens Leaf Extract and Their Antibacterial Activity

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Siraj Shaik ◽  
Madhusudana Rao Kummara ◽  
Sudhakar Poluru ◽  
Chandrababu Allu ◽  
Jaffer Mohiddin Gooty ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Leaf Extract ◽  
Silver Ions ◽  
Inhibition Zone ◽  
Zone Method ◽  
Green Approach ◽  
Tridax Procumbens ◽  
Poly Acrylamide

A series of starch-co-poly(acrylamide) (starch-co-PAAm) hydrogels were synthesized by employing free radical redox polymerization. A novel green approach, Tridax procumbens (TD) leaf extract, was used for reduction of silver ions (Ag+) into silver nanoparticles in the starch-co-PAAm hydrogel network. The formation of silver nanoparticles was confirmed by UV-visible spectroscopy (UV-Vis), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (X-RD) studies. 22% of weight loss difference between hydrogel and silver nanocomposite hydrogel (SNCH) clearly indicates the formation of silver nanoparticles by TGA. TEM images indicate the successful incorporation of silver nanoparticles ranging from 5 to 10 nm in size and spherical in shape with a narrow size distribution. These developed SNCHs were used to study the antibacterial activity by inhibition zone method against gram-positive and gram-negative bacteria such as Bacillus and Escherichia coli. The results indicated that these SNCHs can be used potentially for biomedical applications.

scholarly journals Preparation And Characterization of Sodium Alginate/Acrylic Acid Composite Hydrogels Conjugated To Silver Nanoparticles As An Antibiotic Delivery System

2021 ◽  
Author(s):  
Parvaneh Mohamadinia ◽  
Navideh Anarjan
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Acrylic Acid ◽  
Sodium Alginate ◽  
Release Kinetics ◽  
Silver Ions ◽  
Composite Hydrogels ◽  
Gel Fraction ◽  
Good Biocompatibility ◽  
The Impact

Abstract Hydrogels are specific groups of polymers that are highly swellable in aqueous solutions, despite their water-in-soluble structures. Thus, they are promising drug delivery systems attributable to their unique characteristics such as high hydrophilicity, high controllability, facile production routines and, good biocompatibility. The aim of this research was the preparation of sodium alginate/acrylic acid composite hydrogels conjugated to silver nanoparticles to deliver the cephalexin as a model antibiotic compound. The reduction of silver ions into silver nanoparticles as well as the stabilization of created nanoparticles ensued simultaneously with hydrogel backbone formulation during microwave irradiation and monomer cross-linking processes. The impact of acrylic acid and silver ions concentrations and also the radiation time of microwave were then investigated on the main characteristics of hydrogels, namely, swelling ratio, gel fraction, cephalexin load and, antibacterial activity. The results indicated that the hydrogels’ characteristics could be significantly predicted by studied all independent parameters, through various second-order polynomial models. The multiple optimization analysis suggested that the prepared hydrogels using 7.8 g acrylic acid and 1.5 g silver nitrate and 1 min microwave radiation could give the best hydrogels with the highest swelling degree, gel fraction, cephalexin absorption and, antibacterial activity. The morphology and either absorption or release kinetics of cephalexin by/from the optimum prepared hydrogels were also investigated. No significant differences between the experimental and predicted data was confirmed the suitability of the suggested models.

Phytochemical Synthesis of Silver Nanoparticles Using Anthemis Nobilis Extract and Its Antibacterial Activity

2020 ◽  
Vol 234 (3) ◽  
pp. 531-540
Author(s):  
Saba Ghamipoor ◽  
Faeze Fayyazi ◽  
Saeed Bahadorikhalili
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Nitrate Solution ◽  
Synthesis Method ◽  
Silver Ions ◽  
Good Alternative ◽  
Ft Ir ◽  
Average Size ◽  
Physical And Chemical

AbstractIn this work, green synthesis of silver nanoparticles is described by phytochemical reducing silver nitrate aqueous solution using Anthemis nobilis. For this purpose, Anthemis nobilis extract was used for the synthesis of silver nanoparticles as both surfactant and reducing agent. Green synthesis method is a good alternative to physical and chemical methods, since it is fast, simple, environmentally-friendly and economic. The produced nanoparticles are identified using FE-SEM, EDX, and FT-IR and Uv/Vis techniques. Formation of silver nanoparticles is verified in 430–420 nm range. Reduction of silver ions by hydroxyl functional group is also confirmed by FT-IR device. EDX device confirms the presence of a peak for Ag element without any impurity peak. Silver nanoparticles are identified by FE-SEM device and found to have average size between 17 and 42 nm. Also, the antibacterial activity of the synthesized nanoparticles is compared with that of staphyloccusaureus and pseudomonasa aeruginosa and the maximum inhibitory activity against the bacteria is obtained using 1 mM nitrate solution.

scholarly journals COUROUPITA GUIANENSIS LEAF CALLUS EXTRACT MEDIATED SYNTHESIS AND ANTIBACTERIAL ACTIVITY OF SILVER NANOPARTICLES.

2017 ◽  
Vol 10 (5) ◽  
pp. 126
Author(s):  
Jsr Murthy ◽  
Venkata Kumar T ◽  
Narayana Rao V
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Cell Surface ◽  
Size Variation ◽  
Silver Ions ◽  
Bacterial Strains ◽  
Couroupita Guianensis ◽  
Spectral Peaks ◽  
Characteristic Maximum

Objective: Synthesis of varied sized and morphologically distinct silver nanoparticles (AgNPs) using callus/callus extract, and their promising antibacterial and cytotoxicity was reported from very few plant systems. Here, we investigated silver nanoparticle synthetic potential of Couroupita guianensis leaf callus extract and their antibacterial activity.Methods: synthesis of callus mediated silver nanoparticles and characterisation of physical, chemical, and antibacterial activity of AgNPs.Results: Callus extract rapidly reduced silver ions and stabilized nanoparticles have displayed characteristic maximum UV absorbance at 410 nm. SEM and AFM images revealed their spherical morphology and size variation, which is ranged from 30.38 nm to 88.32 nm and were in small aggregates. Capping of AgNPs by the phenolic compounds and proteins revealed from FTIR spectral peaks. Silver nanoparticles displayed significantly high antimicrobial activity against both Gram positive and negative bacterial strains compared to silver ions and gentamicin. This enhanced antimicrobial activity of AgNPs may due their small size leading to efficient molecular contact with cell surface, and uptake and interaction with vital biomolecules.Conclusions: Stable AgNPs were synthesized through reduction and capping of silver ions by polyphenols and proteins present in callus extract. Theenhanced antimicrobial activity of AgNPs may due to their small size leading to efficient molecular contact with the cell surface, penetration, andinteraction, and inactivation of vital biomolecules.KEY WORDS: Couroupita guianensis, callus extract, Silver nanoparticles (AgNPs), antibacterial activity

scholarly journals Green Synthesis of Silver Nanoparticles Using Hypericum perforatum L. Extract and Evaluation of Their Antibacterial Activity

2020 ◽  
Vol 71 (2) ◽  
pp. 273-279
Author(s):  
Daniela Gitea ◽  
Andrei Teodorescu ◽  
Carmen Pantis ◽  
Delia Mirela Tit ◽  
Alexa Florina Bungau ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Antimicrobial Properties ◽  
Silver Ions ◽  
Antimicrobial Effect ◽  
Colloidal Dispersion ◽  
Colloidal Dispersions ◽  
Application Potential ◽  
Hypericum Perforatum L ◽  
Pathogenic Agents

Silver nanoparticles (AgNPs) ranging in size from 1-100 nm show good application potential in many medical fields (therapies, medical devices, molecular diagnostics) due to their antimicrobial properties. The purpose of this study is to characterize from physicochemical perspective the colloidal dispersion obtained through phyto-synthesis. The existence of colloidal silver particles was visually highlighted through Thyndall effect. The bio-reduction of silver ions was analyzed through modern techniques, UV-VIS spectrophotometry and Hyperspectral Microscopy. After getting the colloidal dispersion, its antibacterial activity was proved by sowing on different plates the following types of pathogenic agents: Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa. The UV-VIS spectrum for the methanolic extract with 10% H. perforatum L. and for the silver colloidal dispersions was achieved, observing a max at 455 nm. The hyperspectral images were achieved observing the shape, conformation, and the size of the obtained particles. During the antibacterial efficacy testing on those three strains of pathological agents, in all situations, the colloidal dispersion had a promising antimicrobial effect.

scholarly journals Green Synthesis of Silver Nanoparticles from Stem Extracts of Caralluma Fimbriyata and Its Antibacterial Activity

2014 ◽  
Vol 2 (3) ◽  
pp. 305-310
Author(s):  
N. Packialakshmi ◽  
S. Naziya
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Silver Ions ◽  
Zone Of Inhibition ◽  
Plant Parts ◽  
Ft Ir ◽  
Ir Analysis ◽  
Commercial Applications ◽  
Chemical Groups ◽  
Green Synthesized Silver Nanoparticles

The aim of this study was to synthesis of silver nanoparticles in the aqueous stem extracts of Caralluma fimbriyata and investigate its antibacterial activity. Nanoparticles are being used in many commercial applications. It was found that aqueous silver ions can be reduced by aqueous stem extracts of plant parts to generate to extremely stable silver nanoparticles in water. The chemical groups studied using FT-IR analysis. Green synthesized silver nanoparticles showed zone of inhibition against isolated gram positive and gram negative bacteria. DOI: http://dx.doi.org/10.3126/ijasbt.v2i3.10796Int J Appl Sci Biotechnol, Vol. 2(3): 305-310  

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