Microwave-irradiated green synthesis of gold nanoparticles for catalytic and anti-bacterial activity

Sunkari, Srinivasarao; Gangapuram, Bhagavanth Reddy; Dadigala, Ramakrishna; Bandi, Rajkumar; Alle, Madhusudhan; Veerabhadram, Guttena

doi:10.1186/s40543-017-0121-1

Cited by 24 publications

(6 citation statements)

References 40 publications

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“…For example, the spectrum of gPdNPs has a peak at 390 nm (Figure 1), which is specific for PdNPs [18,61]. A peak of gAuNPs in the range 525-590 nm is specific for chemically-synthesized AuNPs of different sizes, according to data reported in the literature [8,12,13,19,38,42,43,48] as well as our results [56,62]. The color, size and shape of AuNPs and gAuNPs are dependent on the NPs' synthesis conditions: culture liquid of a 1-day culture incubated for 3 days with HAuCl 4 produces a dark blue solution of small gAuNPs with a peak at 525 nm.…”

Section: Characterization Of the Green-synthesized Nanoparticlessupporting

confidence: 57%

“…NPs of noble metals possess low cytotoxicity, enable easy modification of their surfaces, have straightforward synthesis processes and excellent biocompatibility [8][9][10]. Such advantages make metallic NPs obtained by green synthesis (gNPs) prospective for applications in biological analysis, drug delivery and imaging, environmental monitoring, industrial catalysis and electronic devices [11][12][13][14][15][16][17][18][19]. A special role of these gNPs is related to antimicrobial and antibiofilm agents [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Metallic Nanoparticles Obtained via “Green” Synthesis as a Platform for Biosensor Construction

et al. 2019

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Novel nanomaterials, including metallic nanoparticles obtained via green synthesis (gNPs), have a great potential for application in biotechnology, industry and medicine. The special role of gNPs is related to antibacterial agents, fluorescent markers and carriers for drug delivery. However, application of gNPs for construction of amperometric biosensors (ABSs) is not well documented. The aim of the current research was to study potential advantages of using gNPs in biosensorics. The extracellular metabolites of the yeast Ogataea polymorpha were used as reducing agents for obtaining gNPs from the corresponding inorganic ions. Several gNPs were synthesized, characterized and tested as enzyme carriers on the surface of graphite electrodes (GEs). The most effective were Pd-based gNPs (gPdNPs), and these were studied further and applied for construction of laccase- and alcohol oxidase (AO)-based ABSs. AO/GE, AO-gPdNPs/GE, laccase/GE and laccase-gPdNPs/GE were obtained, and their analytical characteristics were studied. Both gPdNPs-modified ABSs were found to have broader linear ranges and higher storage stabilities than control electrodes, although they are less sensitive toward corresponding substrates. We thus conclude that gPdNPs may be promising for construction of ABSs for enzymes with very high affinities to their substrates.

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Section: Characterization Of the Green-synthesized Nanoparticlessupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Metallic Nanoparticles Obtained via “Green” Synthesis as a Platform for Biosensor Construction

et al. 2019

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“…Various physical and chemical process like laser radiation [8], sonochemical method [9], co-precipitation [10], inverse microemulsions [11], ultrasound irradiation [12], and chemical reduction [13] have been reported for the synthesis of metal nanoparticles. All these methods require dangerous chemicals, noxious solvents, high temperature and pressure conditions, and so on [14][15][16]. However, biological methods are very simple, eco-friendly, and do not require toxic reducing and stabilising agents, therefore this method is widely used [17,18].…”

Section: Introductionmentioning

confidence: 99%

Eco‐friendly synthesis of silver and gold nanoparticles with enhanced antimicrobial, antioxidant, and catalytic activities

Vijayan

Joseph²,

Mathew³

2018

IET nanobiotechnol.

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The present work is emphasised on the bio-fabrication of silver and gold nanoparticles in a single step by a microwave-assisted method using the leaf extract of as both reducing and stabilising agent The synthesised nanoparticles are highly stable and show surface plasmon resonance peak at 413 and 535 nm, respectively, for silver and gold nanoparticles in UV-Vis spectrum. The functional group responsible for the reduction of metal ions were obtained from Fourier transform infrared spectroscopy. The crystalline nature of nanoparticles with face-centred cubic geometry was confirmed by the X-ray diffraction and selected area electron diffraction patterns. The morphology and sizes of the silver and gold nanoparticles were obtained from transmission electron microscopy images. The nanoparticles exhibit effective antimicrobial activities against various pathogenic strains. These antimicrobial properties were analysed by employing agar well diffusion method. The nanoparticles show significant antioxidant properties, and it was determined using 2, 2-diphenyl-1-picrylhydrazyl assay. The nanoparticles also show potent catalytic activity in the degradation of anthropogenic pollutant dyes Congo red and eosin Y by excess NaBH. Thus, the current study demonstrates the potential use of as a reducing and stabilising agent for the synthesis of silver and gold nanoparticles and their relevance in the field of biomedicine and catalysis.

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“…Au-NPs were synthesised from HAuCl 4 using a papaya leaf extract via a green synthetic technique. Investigating these NPs for biomedical applications revealed that they are effective against S. aureus and P. putida (Sunkari et al, 2017).…”

Section: Plant Extract Encapsulated With Mnpsmentioning

confidence: 99%

Natural Products-Based Metallic Nanoparticles as Antimicrobial Agents

et al. 2022

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Natural products offer a wide range of bioactivity including antimicrobial properties. There are many reports showing the antimicrobial activities of phytochem icals from plants. However, the bioactivity is limited due to multidrug resistant properties of the microorganism and different composition of cell membrane. The antibacterial activity of the natural products is different toward Gram-negative and Gram-positive bacteria. These phenomena are caused by improper physicochemical conditions of the substance which hinder the phytochemical bioactivity against the broad range of bacteria. One of the strategies to improve the antimicrobial action is by biogenic synthesis via redox balance of the antimicrobial active substance with metal to form nanosized materials or nanoparticles (NPs). Antibiotic resistance is not relevant to NPs because the action of NPs is via direct contact with bacterial cell walls without the need of penetration into microbial cells. The NPs that have shown their effectiveness in preventing or overcoming biofilm formation such as silver-based nanoparticles (AgNPs), gold-based nanoparticles (AuNPs), platinum-based nanoparticles (PtNPs) and Zinc oxide-based nanoparticles (ZnONPs). Due to its considerably simple synthesis procedure has encouraged researchers to explore antimicrobial potency of metallic nanoparticles. Those metallic nanoparticles remarkably express synergistic effects against the microorganisms tested by affecting bacterial redox balance, thus disrupting their homeostasis. In this paper, we discuss the type of metallic nanoparticle which have been used to improve the antimicrobial activity of plant extract/constituents, preparation or synthesis process and characterisation of the plant-based metallic nanoparticles.

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Microwave-irradiated green synthesis of gold nanoparticles for catalytic and anti-bacterial activity

Cited by 24 publications

References 40 publications

Metallic Nanoparticles Obtained via “Green” Synthesis as a Platform for Biosensor Construction

Metallic Nanoparticles Obtained via “Green” Synthesis as a Platform for Biosensor Construction

Eco‐friendly synthesis of silver and gold nanoparticles with enhanced antimicrobial, antioxidant, and catalytic activities

Natural Products-Based Metallic Nanoparticles as Antimicrobial Agents

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