Sunlight Irradiation Induced Synthesis of Silver Nanoparticles using Glycolipid Bio-surfactant and Exploring the Antibacterial Activity

Das, Amar Jyoti; Kumar, Rajesh; Goutam, Surya Pratap

doi:10.4172/2155-9538.1000208

Cited by 43 publications

(23 citation statements)

References 21 publications

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“…Where α is the absorption coefficient, E g is the bandgap energy and B is constant, n is the value which depends upon transition and is 1/2 for allowed direct bandgap The values of direct bandgap energies of silver nanoparticles obtained from tauc plots of samples are higher than the bandgap energy value of bulk silver. Our band gap energy values are agreed well with the values reported by Das et al [63]. The reason for large bandgap energy values of silver nanoparticles as compared to bulk silver is that nanoparticles are made up of a small number of atoms.…”

Section: Band Gap Energiessupporting

confidence: 92%

Plasma-liquid synthesis of silver nanoparticles and their antibacterial and antifungal applications

Shuaib

Hussain

Ahmad

et al. 2020

Mater. Res. Express

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Silver nanoparticles are synthesized by employing argon atmospheric pressure DC microplasma technique. Specifically, the variation in fructose molar concentration is investigated for its role in the size of nanoparticles. The 2 mM molar concentration of fructose is optimum for the production of silver nanoparticles in the range '50±10 nm'. Antibacterial and antifungal action demonstrates that silver nanoparticles with small size and larger surface areas are very effective against bacteria and fungus.

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Section: Band Gap Energiessupporting

confidence: 92%

Plasma-liquid synthesis of silver nanoparticles and their antibacterial and antifungal applications

Shuaib

Hussain

Ahmad

et al. 2020

Mater. Res. Express

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“…A number of studies exist which reports the synthesis of silver nanoparticles by employing a reducing agent (majorly plant extract) and sunlight. Das et al (2016) reported employing sunlight irradiation induced strategy for the rapid synthesis of silver nanoparticles which were in the range of 70 -90 nm with spherical shape whilst using glycolipid bio-surfactant extracted from Pseudomonas sp. as a reducing agent.…”

Section: Results and Discussion Isolation And Identification Of Bactementioning

confidence: 99%

“…bulgaricus was mixed with 10ml of 1mM of AgNO 3. The reaction mixture was stirred properly and exposed to direct sunlight on a bright sunny day for 10 minutes (Das et al, 2016). Ten Milliliter (10ml) of AgNO 3 and 10ml of supernatant separately were used as control as such were placed alongside the reaction mixture.…”

Section: Introductionmentioning

confidence: 99%

Eco-friendly synthesis of silver nanoparticles using <i>Lactobacillus delbrueckii</i> subsp. <i>bulgaricus</i> isolated from kindrimo (locally fermented milk) in Kano State, Nigeria

Sani¹,

Aminu²,

Mukhtar³

2018

Bayero J. Pure App. Sci.

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Silver nanoparticles have gained global popularity because of its application in crucial areas such as medical diagnosis/therapy, solar cell development, water treatment, surface coating and cosmetic production. Bacterial synthesis of silver nanoparticles is regarded as eco-friendly due to minimal waste generated while being energy efficient. This study was aimed at synthesizing silver nanoparticles using Lactobacillus specie isolated from Kindrimo under the influence of sunlight irradiation. Lactobacillus delbrueckii subsp. bulgaricus isolated from Kindrimo was identified using morphological and biochemical techniques and confirmed using 16S rRNA gene sequencing. The eco-friendly protocol for the extracellular synthesis of silver nanoparticles was accomplished by treatment of Lactobacillus delbrueckii subsp. bulgaricus extract with silver nitrate solution in the ratio 1:10 under the influence of sunlight irradiation. Synthesized silver nanoparticles were confirmed and characterized using UV-Visible Spectrophotometry, Dynamic Light Scattering, Transmission Electron Microscopy and Energy Dispersion Spectroscopy. The absorbance spectrum preliminarily confirmed the formation of silver nanoparticles by revealing characteristic broad peak at 415nm. Dynamic Light Scattering measurements further confirmed synthesis by showing average particle size distribution of 147nm. Micrograph of Transmission Electron Microscopy revealed that the synthesized silver nanoparticles were polyhedral and spherical in shape with size ranging 1.4 to 8.9nm. The elemental composition of the resultant colloidal solution was shown to contain silver nanoparticles when subjected to Energy Dispersion Spectroscopy. This study proved that the effect of sunlight irradiation on Lactobacillus mediated synthesis of silver nanoparticles is energy efficient and inexpensive.

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“…The band gap reported for AgNPs ranged from 2.4 to 3.4 eV. 29,37,38 The AgNPs synthesized were also characterized by XRD, VP-SEM, AFM, FTIR and TGA (Fig. 2).…”

Section: Characterization Of Agnps Synthesized At Optimized Conditionsmentioning

confidence: 99%

Development of a new biomimetic method for the synthesis of silver nanoparticles based on fungal metabolites: optimization and antibacterial activity

Cisternas

Seabra

Pieretti

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: A biomimetic method was developed for the synthesis of silver nanoparticles (AgNPs). Synthetic chemical compounds were used according to the metabolites present in the fungal extracts for the synthesis of AgNPs. The main objective of this study was to find a simple and effective synthesis method without the presence of a living organism. METHODOLOGY: A central composite design combined with response surface methodology was used to optimize the necessary metabolite concentrations (flavin adenine dinucleotide (FAD), hydroquinone (HQ), and L-cysteine (L-cys)) for the synthesis of AgNPs. The design was assessed based on the size distribution and zeta potential of the nanoparticles. In addition, the antibacterial activity of the AgNPs against Escherichia coli, Staphylococcus aureus, Serratia marcescens and Salmonella enterica was tested. RESULTS:The results demonstrated that AgNO 3 (2 mmol L −1 ), HQ (20 mmol L −1 ), L-cys (20 mmol L −1 ) and FAD (50.5 nmol L −1 ) at pH 8.4 were the optimal reaction parameters. The characterization allowed the determination of quasi-spherical AgNPs with an average hydrodynamic size of 101 nm, a zeta potential of −24 mV and the presence of elemental silver (Ag 0 ) in their composition. Fourier transform infrared spectroscopy showed silver and L-cys interactions, supporting the role of L-cys as a coating agent. The antibacterial activity showed that AgNPs displayed a minimum inhibitory concentration of 20-30 ∼g mL −1 and a minimum bactericidal concentration of 30-40 ∼g mL −1 .CONCLUSIONS: This study demonstrates the feasibility of the reduction of Ag + to Ag 0 using synthetic metabolites, which mimic the reduction and synthesis of fungal biomass. Therefore, it represents a new biocompatible, eco-friendly and fast method to produce AgNPs.

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Sunlight Irradiation Induced Synthesis of Silver Nanoparticles using Glycolipid Bio-surfactant and Exploring the Antibacterial Activity

Cited by 43 publications

References 21 publications

Plasma-liquid synthesis of silver nanoparticles and their antibacterial and antifungal applications

Plasma-liquid synthesis of silver nanoparticles and their antibacterial and antifungal applications

Eco-friendly synthesis of silver nanoparticles using <i>Lactobacillus delbrueckii</i> subsp. <i>bulgaricus</i> isolated from kindrimo (locally fermented milk) in Kano State, Nigeria

Development of a new biomimetic method for the synthesis of silver nanoparticles based on fungal metabolites: optimization and antibacterial activity

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