Extracellular synthesis of silver nanoparticles by novel Pseudomonas veronii AS41G inhabiting Annona squamosa L. and their bactericidal activity

2015 ◽  
Vol 136 ◽  
pp. 1434-1440 ◽  
Author(s):  
Syed Baker ◽  
K. Mohan Kumar ◽  
P. Santosh ◽  
D. Rakshith ◽  
S. Satish
Keyword(s):  
Silver Nanoparticles ◽  
Bactericidal Activity ◽  
Annona Squamosa ◽  
Extracellular Synthesis ◽  
Pseudomonas Veronii

Antimicrobial Activity of Silver Nanoparticles Synthesized by Streptomyces Species JF714876

2012 ◽  
Vol 5 (1) ◽  
pp. 1638-1642 ◽  
Author(s):  
Vidyasagar G M ◽  
Shankaravva B ◽  
R Begum ◽  
Imrose ◽  
Sagar R ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Silver Ions ◽  
Human Beings ◽  
Streptomyces Species ◽  
Force Microscopy ◽  
E Coli ◽  
Extracellular Synthesis ◽  
Atomic Force ◽  
Uv Visible

Microorganisms like fungi, actinomycetes and bacteria are considered nanofactories and are helpful in the production of nanoparticles useful in the welfare of human beings. In the present study, we investigated the production of silver nanoparticles from Streptomyces species JF714876. Extracellular synthesis of silver nanoparticles by Streptomyces species was carried out using two different media. Silver nanoparticles were examined using UV-visible, IR and atomic force microscopy. The size of silver nanoparticles was in the range of 80-100 nm. Antimicrobial activity of silver nanoparticle against bacteria such as E. coli, S. aureus, and dermatophytes like T. rubrum and T. tonsurans was determined. Thus, this study suggests that the Streptomyces sp. JF741876 can produce silver ions that can be used as an antimicrobial substance.

scholarly journals Silver-nanoparticles increase bactericidal activity and radical oxygen responses against bacterial pathogens in human osteoclasts

2018 ◽  
Vol 14 (2) ◽  
pp. 601-607 ◽  
Author(s):  
Valerie Aurore ◽  
Fabienne Caldana ◽  
Marianne Blanchard ◽  
Solange Kharoubi Hess ◽  
Nils Lannes ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Bactericidal Activity ◽  
Bacterial Pathogens ◽  
Human Osteoclasts

scholarly journals Potential Applications for Annona squamosa Leaf Extract in the Treatment and Prevention of Foodborne Bacterial Disease

2013 ◽  
Vol 8 (3) ◽  
pp. 1934578X1300800 ◽  
Author(s):  
Achara Dholvitayakhun ◽  
Nathanon Trachoo ◽  
Uthai Sakee ◽  
T.P. Tim Cushnie
Keyword(s):  
Bactericidal Activity ◽  
Public Health Problem ◽  
Time Frame ◽  
Bacterial Disease ◽  
Major Public Health Problem ◽  
Annona Squamosa ◽  
Treatment And Prevention ◽  
Heat Labile ◽  
Potential Applications ◽  
Time Kill

Foodborne disease is a major public health problem. The present study examined Annona squamosa leaves, which are traditionally used to treat diarrhea and other infections, for their potential to be used in modern food safety or medicine. Active constituents were partially purified by ethanol extraction and column chromatography. MICs of the extract were 62.5 to 125 μg/mL against Bacillus cereus, Listeria monocytogenes and Staphylococcus aureus, and 250 μg/mL against Campylobacter jejuni. In time-kill assays, 500 μg/mL of the extract reduced colony forming unit numbers of C. jejuni almost 10 000-fold within 12 hours. Similar decreases were seen against B. cereus, but over a longer time-frame. LC-MS analysis indicated the presence of reticuline and oxophoebine. Assessment of stability by MIC assay showed activity was heat-labile, with loss of activity greatest following high temperature treatments. Activity was relatively stable at refrigeration temperature. These results indicate A. squamosa has broad-spectrum but heat-labile activity against foodborne bacterial pathogens, and bactericidal activity against B. cereus and C. jejuni. This bactericidal activity is not sufficiently rapid for A. squamosa to be used as a food sanitizer, but the extract could potentially be developed as an additive for refrigerated foods, or a modern treatment for foodborne illness.

scholarly journals Levan-Capped Silver Nanoparticles for Bactericidal Formulations: Release and Activity Modelling

2019 ◽  
Vol 20 (6) ◽  
pp. 1502 ◽  
Author(s):  
Álvaro González-Garcinuño ◽  
Rubén Masa ◽  
María Hernández ◽  
Ángel Domínguez ◽  
Antonio Tabernero ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Dose Response ◽  
Bactericidal Activity ◽  
Lethal Dose ◽  
Response Model ◽  
Inhibition Activity ◽  
E Coli ◽  
Unique Model ◽  
Bacteria Inhibition ◽  
Silver Release

An environmentally friendly technique was used to produce levan-capped silver nanoparticles of about 30 nm (with a loading of 30%) that showed bactericide effect, for E. coli and B. subtilis. That effect was mathematically studied with a dose-response model (lethal dose of 12.4 ppm and 6.8 ppm respectively). These silver nanoparticles were subsequently introduced in a gel to create a silver release system with bacteria inhibition activity. Silver release from the gel and its bactericidal activity was theoretically studied to develop a unique model that is able to predict accurately both silver release and lethal dose for any type of bacteria. This model will be useful for performing predictions for future silver in gel applications.

A new method for producing highly concentrated non-aqueous dispersions of silver nanoparticles and the evaluation of their bactericidal activity

2014 ◽  
Vol 16 (11) ◽  
Author(s):  
Roselaine da S. Oliveira ◽  
Marcos A. Bizeto ◽  
Ana M. A. Liberatore ◽  
Ivan H. J. Koh ◽  
Fernanda F. Camilo
Keyword(s):  
Silver Nanoparticles ◽  
Bactericidal Activity ◽  
New Method ◽  
Aqueous Dispersions
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