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 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.

Green synthesis of silver nanoparticles from Psidium guajava leaves and its antibacterial activity

2017 ◽  
Vol 6 (7) ◽  
pp. 5441 ◽  
Author(s):  
Geetha Venugopal
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Plant Extract ◽  
Psidium Guajava ◽  
Zone Of Inhibition ◽  
Guava Leaf ◽  
Green Synthesized Silver Nanoparticles

In the present study, Psidium guajava leaves were taken for synthesizing silver nanoparticles and checked their antibacterial activity against E.coli, Klebsiella, Pseudomonas, Staphylococcus and Acinetobacter. The plant extract was analysed for the detection of the presence of protein, carbohydrate, flavonoids, terpenoids, glycosides, steroids, saponins, phenols and tannins. In this present study, the antibacterial activity of green synthesized silver nanoparticles from guava leaf shows the zone of inhibition against all the five pathogens.

scholarly journals Green synthesis characterization and antimicrobial activity against Staphylococcus aureus of silver nanoparticles using extracts of neem, onion and tomato

RSC Advances ◽  
2019 ◽  
Vol 9 (30) ◽  
pp. 17002-17015 ◽  
Author(s):  
Kishore Chand ◽  
M. Ishaque Abro ◽  
Umair Aftab ◽  
Ahmer Hussain Shah ◽  
Muhammad Nazim Lakhan ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Neem Leaves

The silver nanoparticles were synthesized from the neem leaves, onions, and tomato extracts, and the antibacterial activity of the particles was studied.

Green Synthesis, Characterization and Antimicrobial Activity of Silver Nanoparticles Produced fromFumaria officinalis L. Plant Extract

2018 ◽  
Vol 80 (6) ◽  
pp. 803-813 ◽  
Author(s):  
Milorad Cakić ◽  
Slobodan Glišić ◽  
Dragan Cvetković ◽  
Miroslav Cvetinov ◽  
Ljiljana Stanojević ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Plant Extract

scholarly journals Green synthesis of silver nanoparticles in aloe vera plant extract prepared by a hydrothermal method and their synergistic antibacterial activity

2016 ◽  
Author(s):  
Patcharaporn Tippayawat ◽  
Nutthakritta Phromviyo ◽  
Parichart Boueroy ◽  
Apiwat Chompoosor
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Hydrothermal Method ◽  
Plant Extract ◽  
Pathogenic Bacteria ◽  
Antibacterial Effect ◽  
Aloe Vera ◽  
Diffusion Method

Background: There is worldwide interest in silver nanoparticles (AgNPs) synthesized by various chemical reactions for use in applications exploiting their antibacterial activity, even though these processes exhibit a broad range of toxicity in vertebrates and invertebrates alike. To avoid the chemical toxicity, biosynthesis (green synthesis) of metal nanoparticles is proposed as a cost-effective and environmental friendly alternative. Aloe vera leaf extract is a medicinal agent with multiple properties including an antibacterial effect. Moreover the constituents of aloe vera leaves include lignin, hemicellulose, and pectins which can be used in the reduction of silver ions to produce as AgNPs@aloe vera (AgNPs@AV) with antibacterial activity. Methods: AgNPs were prepared by an eco-friendly hydrothermal method using an aloe vera plant extract solution as both a reducing and stabilizing agent. AgNPs@AV were characterized using XRD and SEM. Additionally, an agar well diffusion method was used to screen for antimicrobial activity. MIC and MBC were used to correlate the concentration of AgNPs@AV its bactericidal effect. SEM was used to investigate bacterial inactivation. Then the toxicity with human cells was investigated using an MTT assay. Results: The synthesized AgNPs were crystalline with sizes of 70.70 ± 22-192.02 ± 53 nm as revealed using XRD and SEM. The sizes of AgNPs can be varied through alteration of times and temperatures used in their synthesis. These AgNPs were investigated for potential use as an antibacterial agent to inhibit pathogenic bacteria. Their antibacterial activity was tested on S. epidermidis and P. aeruginosa. The results showed that AgNPs had a high antibacterial which depended on their synthesis conditions, particularly when processed at 100 oC for 6 h and 200 oC for 12 h. The cytotoxicity of AgNPs was determined using human PBMCs revealing no obvious cytotoxicity. These results indicated that AgNPs@AV can be effectively utilized in pharmaceutical, biotechnological and biomedical applications. Discussion: Aloe vera extract was processed using a green and facile method. This was a hydrothermal method to reduce silver nitrate to AgNPs@AV. Varying the hydrothermal temperature provided the fine spherical shaped nanoparticles. The size of the nanomaterial was affected by its thermal preparation. The particle size of AgNPs could be tuned by varying both time and temperature. A process using a pure AG phase could go to completion in 6h at 200 oC, whereas reactions at lower temperatures required longer times. Moreover, the antibacterial effect of this hybrid nanomaterial was sufficient that it could be used to inhibit pathogenic bacteria since silver release was dependent upon its particle size. The high activity of the largest AgNPs might have resulted from a high concentration of aloe vera compounds incorporated into the AgNPs during hydrothermal synthesis.

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