Sequentially Reduced Biogenic Silver-gold Nanoparticles With Enhanced Antimicrobial Potential Over Silver And Gold Monometallic Nanoparticles

Nagaonkar, Dipali; Rai, Mahendra

doi:10.5185/amlett.2015.5737

Cited by 30 publications

(16 citation statements)

References 1 publication

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“…India and used for NP synthesis. 6g of dried powder was mixed in 50 ml of distilled water and incubated at room temperature for 24 h. The extract was filtered and centrifuged for 30 min at 4000 rpm ( Nagaonkar and Rai, 2015 ). The supernatant was used for ZnO NPs biosynthesis and stored at 4°C for further use.…”

Section: Methodsmentioning

confidence: 99%

Effective Antimicrobial Activity of Green ZnO Nano Particles of Catharanthus roseus

et al. 2018

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In the present study, zinc oxide nanoparticles (ZnO NPs) were synthesized using leaf extract of Catharanthus roseus (C. roseus) under different physical parameters. Biosynthesis of ZnO NPs was confirmed by UV-Visible spectrophotometer and further, characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy-Dispersive X-ray spectroscopy (EDX), Atomic Force Microscopy (AFM), Photoluminescence study and Dynamic Light Scattering (DLS). We have also confirmed that several physical parameters such as pH, temperature, concentration of metal ions and reaction time were able to regulate shape and size of synthesized ZnO NPs. XRD and TEM analysis provided the information about the average size and hexagonal morphology of ZnO NPs. FTIR spectra analysis suggested that phenolic compounds played crucial role in the biosynthesis of ZnO NPs. The significant antibacterial activity of ZnO NPs was observed against Staphylococcus aureus MTCC 9760 (S. aureus), Streptococcus pyogenes MTCC 1926 (S. pyogenes), Bacillus cereus MTCC 430 (B. cereus), Pseudomonas aeruginosa MTCC 424 (P. aeruginosa), Proteus mirabilis MTCC 3310 (P. mirabilis) and Escherichia coli MTCC 40 (E. coli). The synthesized ZnO NPs have shown antibacterial efficacy against both Gram-positive and Gram-negative pathogens. Synergistic effects of ZnO NPs and streptomycin showed increased efficacy as indicated by the increased zone of clearance in comparison to their individual effects (either ZnO NPs or streptomycin). Overall, the results elucidated a rapid, cost-effective, environmentally friendly and convenient method for ZnO NPs synthesis, which could be used as a potential antimicrobial agent against drug resistant microbes.

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Section: Methodsmentioning

confidence: 99%

Effective Antimicrobial Activity of Green ZnO Nano Particles of Catharanthus roseus

et al. 2018

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“…B). Regardless of lower values of zeta potential, both of the nanoparticles were found to be highly stable for more than 180 days, which can be attributed to capping layer derived from metabolites present in the fungal filtrate .…”

Section: Resultsmentioning

confidence: 96%

Mycosynthesized Silver Nanoparticles as Potent Growth Inhibitory Agents Against Selected Waterborne Human Pathogens

Sonar¹,

Nagaonkar

Ingle

et al. 2017

CLEAN Soil Air Water

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Search for innovative technologies for eradication of water contamination and thereby reducing waterborne diseases is a global need. Use of antimicrobial metal nanoparticles for water purification processes has opened up new possibilities to combat waterborne diseases. The present study demonstrates the synthesis of antibacterial silver nanoparticles by using fungal filtrates of Fusarium oxysporum and Phoma sorghina. Transmission electron microscopy confirmed the synthesis of isotropic, spherical nanoparticles with 20–25 nm as mean size. The mycosynthesized nanoparticles were evaluated for their growth inhibition activity against waterborne pathogens. Staphylococcus aureus was found to be the most susceptible organism to the silver nanoparticles synthesized from P. sorghina; whereas, high bacteriostatic activity of silver nanoparticles was observed against Brevibacillus borstelensis. The present findings indicate the potential of silver nanoparticles for use in water purification processes.

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“…The peak at 1408 cm −1 is due to COO − symmetric stretching of chloroplasts shifted to leaf extract a, b a 1 , c, d a 2 , e, f a 3 , g EDX and h SAED 1404 cm −1 [67]. A minor peak at about 661 cm −1 is due to C-Cl or C-Br stretch of alkyl halides [68]. In FTIR, such kind of shifting vibrational spectra has been ascribed that the O-H (3402 cm −1 ) and (NH) C = O groups (1636 cm −1 ) can bind with AuNPs [25,64].…”

Section: Ftirmentioning

confidence: 97%

Size-dependent catalytic property of gold nanoparticle mediated by Justicia adhatoda leaf extract

Latha

Periasamy²,

Gnanamoorthy

et al. 2018

SN Appl. Sci.

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In this contribution, we demonstrate the synthesis of gold nanoparticles (AuNPs) using an entirely green chemistry process. Justicia adhatoda leaf extract used as a bioreductant for the synthesis of AuNPs and its particle sizes are controlled by altering the concentration of metal salt. The optical and morphological properties were studied. We report on the synthesis of stable spherical, well-dispersed colloidal AuNPs (27.1, 33.3 and 46.8 nm) by efficient reducing agents with its mechanisms. The X-ray diffraction analysis also confirmed the obtained sizes of AuNPs with its crystallite size (20.2, 40.1 and 40.3 nm). Catalytic activity of fabricated AuNPs are also examined on the degradation of organic dyes.

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Sequentially Reduced Biogenic Silver-gold Nanoparticles With Enhanced Antimicrobial Potential Over Silver And Gold Monometallic Nanoparticles

Cited by 30 publications

References 1 publication

Effective Antimicrobial Activity of Green ZnO Nano Particles of Catharanthus roseus

Effective Antimicrobial Activity of Green ZnO Nano Particles of Catharanthus roseus

Mycosynthesized Silver Nanoparticles as Potent Growth Inhibitory Agents Against Selected Waterborne Human Pathogens

Size-dependent catalytic property of gold nanoparticle mediated by Justicia adhatoda leaf extract

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