Biosynthesis of gold nanoparticles using the bacteria Rhodopseudomonas capsulata

He, Shiying; Guo, Zhirui; Zhang, Yu; Zhang, Song; Wang, Jing; Gu, Ning

doi:10.1016/j.matlet.2007.01.018

Cited by 719 publications

(264 citation statements)

References 20 publications

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“…The evidence of the primary confirmation of UV-visible spectra of gold nanoparticles revealed a distinct absorption peak at 542 nm corresponding to surface plasmon resonance with broadening peak-disclosed poly-dispersed gold nanoparticles (Kalishwaralal et al 2010;Kalishwaralal et al 2009;Agnihotri et al 2009;He et al 2007).…”

Section: Discussionmentioning

confidence: 89%

Gold nanoparticles synthesized by Brassica oleracea (Broccoli) acting as antimicrobial agents against human pathogenic bacteria and fungi

Piruthiviraj

Margret²,

Krishnamurthy

2015

Appl Nanosci

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Production of antimicrobial agents through the synthesis of gold nanoparticles using green technology has been extensively made consistent by various researchers; yet, this study uses the flower bud's aqueous extracts of Brassica oleracea (Broccoli) as a reducing agent for chloroauric acid (1 mM). After 30 min of incubation, synthesis of gold nanoparticles (AuNps) was observed by a change in extract color from pale yellow to purple color. Synthesis of AuNps was confirmed in UV-visible spectroscopy at the range of approximately 560 nm. The SEM analysis showed the average nanoparticles size of 12-22 nm. The antimicrobial activity of AuNps was analyzed by subjecting it to human pathogenic bacteria (Grampositive Staphylococcus aureus and Gram-negative Klebsiella pneumonia) and fungi (Aspergillus flavus, Aspergillus niger and Candida albicans) using disc diffusion method. The broccoli-synthesized AuNps showed the efficient antibacterial and antifungal activity of above-mentioned microbes. It was confirmed that AuNps have the best antimicrobial agent compared to the standard antibiotics (Gentamicin and Fluconazole). When the concentrations of AuNps were increased (10, 25, and 50 lg/ml), the sensitivity zone also increased for all the tested microbes. The synthesized AuNps are capable of rendering high antimicrobial efficacy and, hence, have a great potential in the preparation of drugs used against major bacterial and fungal diseases in humans.

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Section: Discussionmentioning

confidence: 89%

Gold nanoparticles synthesized by Brassica oleracea (Broccoli) acting as antimicrobial agents against human pathogenic bacteria and fungi

Piruthiviraj

Margret²,

Krishnamurthy

2015

Appl Nanosci

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“…It has been illustrated that bacteria found at Alpine sites have the capability to produce zero valent palladium (Pd0) nanoparticles. It was found that Pseudomonas cells were involved in producing catalytically active nanoparticles [42] . Copper nanoparticles were found di cult to synthesize because copper at nanoscale are unstable.…”

Section: Synthesis Of Nanoparticles From Bacteriamentioning

confidence: 99%

“…The table also illustrates the location of the nanoparticles in relation to the cells and the suggested method of synthesis (Figure 2). [48] Rhodococcus species Au Intracellular Reduction [49] Escherichia coli Pd, Pt Extracellular Reduction [50] Rhodopseudomonas capsulata Au Extracellular Reduction [42] Pseudomonas aeruginosa Au Extracellular Reduction [51] Delftiaacidovorans Au Extracellular Reduction [41] Bacillus licheniformis Ag Intracellular Reduction [43] Shewanella sp. AsS Extracellular Reduction [52] Shewanella sp.…”

Section: Synthesis Of Nanoparticles From Plantsmentioning

confidence: 99%

A Brief Review on Nanoparticles: Types of Platforms, Biological Synthesis and Applications

Anwar¹

2018

Res. Rev. J Mat. Sci

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“…Recent works by Xie et al (2007a) demonstrated that proteins are the principal biomolecules involved in the algal synthesis of gold NPs. Other researchers He et al 2007) have postulated that microorganisms secrete enzymes which may be responsible for the reduction of metal ions which result in the NPs nucleation and growth. Ahmad et al (2003) postulated that a NADH-dependent reductase is involved in Ag NPs synthesis by Fusarium oxysporum.…”

Section: Mechanism Of Nanoparticle Synthesismentioning

confidence: 99%

A green chemical approach for the synthesis of gold nanoparticles: characterization and mechanistic aspect

Das

Marsili

2010

Rev Environ Sci Biotechnol

104

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This IRCSET-EMPOWER (Irish Research Council for Science, Engineering andTechnology Postdoctoral Research Grant) project aims to improve current methodology for the synthesis of metal nanoparticles (NPs). The development of efficient methodology for metal nanomaterials synthesis is an economical and environmental challenge. While the current methods for NPs synthesis are often energy-intensive and involve toxic chemicals, NPs biosynthesis can be carried on at circumneutral pH and mild temperature, resulting in low cost and environmental impact. Nanomaterial biosynthesis has been already observed in magnetotactic bacteria, diatoms, and S-layer bacteria, however, controlled NPs biosynthesis is a relatively new area of research with considerable potential for development. A thorough understanding of the biochemical mechanism involved in NPs biosynthesis is needed, before biosynthetic methods can be economically competitive. The analysis and identification of active species in the nucleation and growth of metal NPs is a daunting task, due to the complexity of the microbial system. This project work focuses on the controlled biosynthesis of gold NPs by fungal microorganisms and aims to determine the biochemical mechanism involved in nucleation and growth of the particles.

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Biosynthesis of gold nanoparticles using the bacteria Rhodopseudomonas capsulata

Cited by 719 publications

References 20 publications

Gold nanoparticles synthesized by Brassica oleracea (Broccoli) acting as antimicrobial agents against human pathogenic bacteria and fungi

Gold nanoparticles synthesized by Brassica oleracea (Broccoli) acting as antimicrobial agents against human pathogenic bacteria and fungi

A Brief Review on Nanoparticles: Types of Platforms, Biological Synthesis and Applications

A green chemical approach for the synthesis of gold nanoparticles: characterization and mechanistic aspect

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