scholarly journals Photochemical synthesis of biocompatible and antibacterial silver nanoparticles embedded within polyurethane polymers

2015 ◽  
Vol 14 (4) ◽  
pp. 661-664 ◽  
Author(s):  
Sara Saez ◽  
Chiara Fasciani ◽  
Kevin G. Stamplecoskie ◽  
Luke Brian-Patrick Gagnon ◽  
Thien-Fah Mah ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Silver Nanoparticles ◽  
Photochemical Synthesis ◽  
Antibiofilm Activity ◽  
Primary Cells

In situ formed AgNP within polyurethane improved the antibacterial and antibiofilm activity against Pseudomonas aeruginosa with negligible toxicity for primary cells and erythrocytes.

scholarly journals Antimicrobial and Antibiofilm Potency of Green Silver Nanoparticles Synthesized by Aqueous Garlic Extract Against Microbes Causing Otitis Media

2019 ◽  
Author(s):  
Eman A. Mustafa ◽  
Abd El Gawad Hashem ◽  
Hala N. Elhifnawi ◽  
Hanady G. Nada ◽  
Rania A. Khattab
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Silver Nanoparticles ◽  
Otitis Media ◽  
Aspergillus Flavus ◽  
Economic Problem ◽  
Garlic Extract ◽  
Diffusion Method ◽  
P Value ◽  
Antibiofilm Activity ◽  
Biofilm Production

Abstract Aim of study: Otitis media (OM) is highly prevalent worldwide and is the main cause of hearing loss in developing countries. Resistant microorganisms and biofilm formation have become a major health and economic problem. The aim of this study was to establish an eco-friendly method for synthesis of silver nanoparticles using aqueous garlic extract and sunlight. Moreover, detect its potential to inhibit otitis media microbes.Methods: Basically, highly resistant and biofilm forming otitis media pathogenic isolates were determined by Kirby-Bauer disc diffusion method and their biofilm production qualitatively was tested. Then, compared their susceptibility to tetracyclin 30µg (for bacteria) and nystatin 100 µg (for fungi) alone and with different concentrations of green synthesized silver nanoparticles (AgNPs), as well as, their biofilm production. AgNPs were prepared by easy, fast, non-toxic, economically eco-friendly way, using the direct sunlight irradiation on aqueous garlic extract. Their characterization by UV- visible spectral analysis, TEM, DLS, XRD and FTIR were studied. Results: Two multidrug resistant bacterial isolates; Pseudomonas aeruginosa and Bacillus cereus were detected as biofilm producers with black colonies on congo-red agar and three resistant fungal isolates to nystatin; Penicillium chrysogenum, Aspergillus niger and Aspergillus flavus were tested against green synthesized AgNPs. Highly significant (p-value<0.001) antimicrobial and antibiofilm activity of biosynthesized AgNPs against tested pathogens were illustrated in this study. TEM images for Pseudomonas aeruginosa and Aspergillus flavus after treated with AgNPs, were exhibited shrinkage in the cytoplasmic materials, rupture of cell walls, precipitation of AgNPs particles inside the cells and biofilm was mostly disseminated.Conclusion: aqueous garlic extract that used to stabilize the AgNPs may be ideal natural candidates for future studies exploring their safely use in biomedical applications especially against the repeated infections caused by multi drug resistant (MDR) and biofilm forming microbials as in otitis media.

The In Vitro Antibiofilm Activity of Water Leaf Extract of Papaya (Carica papaya L.) against Pseudomonas aeruginosa

2017 ◽  
Vol 2 (3) ◽  
pp. 150-163
Author(s):  
Ekajayanti Kining ◽  
Syamsul Falah ◽  
Novik Nurhidayat
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Contact Time ◽  
Cell Attachment ◽  
Water Extract ◽  
Opportunistic Pathogen ◽  
Bacterial Biofilm ◽  
Antibiofilm Activity ◽  
Bacterial Survival ◽  
Optimum Conditions

Pseudomonas aeruginosa is one of opportunistic pathogen forming bacterial biofilm. The biofilm sustains the bacterial survival and infections. This study aimed to assess the activity of water extract of papaya leaves on inhibition of cells attachment, growth and degradation of the biofilm using crystal violet (CV) biofilm assay. Research results showed that water extract of papaya leaves contains alkaloids, tanins, flavonoids, and steroids/terpenoids and showed antibacterial activity and antibiofilm against P. aeruginosa. Addition of extract can inhibit the cell attachment and was able to degrade the biofilm of 40.92% and 48.058% respectively at optimum conditions: extract concentration of 25% (v/v), temperature 37.5 °C and contact time 45 minutes. With a concentration of 25% (v/v), temperature of 50 °C and the contact time of 3 days, extract of papaya leaves can inhibit the growth of biofilms of 39.837% v/v.

Confocal and SEM imaging to demonstrate food pathogen- biofilm biocontrol by pyocyanin from Pseudomonas aeruginosa BTRY1

2016 ◽  
Vol 6 (01) ◽  
pp. 5218
Author(s):  
Laxmi Mohandas ◽  
Anju T. R. ◽  
Sarita G. Bhat*
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Biofilm Formation ◽  
Laser Scanning ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Antibiofilm Activity ◽  
Opportunistic Pathogens ◽  
Redox Active ◽  
Sem Imaging ◽  
The Impact

An assortment of redox-active phenazine compounds like pyocyanin with their characteristic blue-green colour are synthesized by Pseudomonas aeruginosa, Gram-negative opportunistic pathogens, which are also considered one of the most commercially valuable microorganisms. In this study, pyocyanin from Pseudomonas aeruginosa BTRY1 from food sample was assessed for its antibiofilm activity by micro titer plate assay against strong biofilm producers belonging to the genera Bacillus, Staphylococcus, Brevibacterium and Micrococcus. Pyocyanin inhibited biofilm activity in very minute concentrations. This was also confirmed by Scanning Electron Microscopy (SEM) and Confocal Laser Scanning Microscopy (CLSM). Both SEM and CLSM helped to visualize the biocontrol of biofilm formation by eight pathogens. The imaging and quantification by CLSM also established the impact of pyocyanin on biofilm-biocontrol mainly in the food industry.

scholarly journals Rapid evolution and host immunity drive the rise and fall of carbapenem resistance during an acute Pseudomonas aeruginosa infection

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rachel Wheatley ◽  
Julio Diaz Caballero ◽  
Natalia Kapel ◽  
Fien H. R. de Winter ◽  
Pramod Jangir ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Efflux Pump ◽  
Rapid Evolution ◽  
Carbapenem Resistance ◽  
Host Immunity ◽  
High Definition ◽  
Loss Of Resistance ◽  
Pseudomonas Aeruginosa Infection ◽  
Second Wave

AbstractIt is well established that antibiotic treatment selects for resistance, but the dynamics of this process during infections are poorly understood. Here we map the responses of Pseudomonas aeruginosa to treatment in high definition during a lung infection of a single ICU patient. Host immunity and antibiotic therapy with meropenem suppressed P. aeruginosa, but a second wave of infection emerged due to the growth of oprD and wbpM meropenem resistant mutants that evolved in situ. Selection then led to a loss of resistance by decreasing the prevalence of low fitness oprD mutants, increasing the frequency of high fitness mutants lacking the MexAB-OprM efflux pump, and decreasing the copy number of a multidrug resistance plasmid. Ultimately, host immunity suppressed wbpM mutants with high meropenem resistance and fitness. Our study highlights how natural selection and host immunity interact to drive both the rapid rise, and fall, of resistance during infection.

Molecular docking, quorum quenching effect, antibiofilm activity and safety profile of silver-complexed sulfonamide on Pseudomonas aeruginosa

Biofouling ◽  
2021 ◽  
pp. 1-17
Author(s):  
Fallon dos Santos Siqueira ◽  
Camilla Filippi dos Santos Alves ◽  
Alencar Kolinski Machado ◽  
Josiéli Demétrio Siqueira ◽  
Thiago dos Santos ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Molecular Docking ◽  
Safety Profile ◽  
Quorum Quenching ◽  
Antibiofilm Activity ◽  
Quenching Effect
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