Diversity of Bacterial Synthesis of Silver Nanoparticles

Javaid, Aqib; Oloketuyi, Sandra Folarin; Khan, Mohammad Mansoob

doi:10.1007/s12668-017-0496-x

Cited by 118 publications

(51 citation statements)

References 207 publications

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“…Nitrate reductase is an enzyme produced by some bacteria activated at alkaline pH in the presence of a substrate (NO3 − ). This enzyme catalyses the reduction of nitrate to nitrite, illustrated in the equation [67] Ag + (aq) + NO3 − (aq) + NADH + H + + e − → Ag 0 (s) + NO2 − (aq) + NAD + + H2O(l) Ho et al described a synthesis method using ascorbic acid as a reducing agent for the reduction of AgNO 3 . They were able to obtain hybrid AgNPs inside a polylysine shell modified by different fatty acids.…”

Section: Green Chemistrymentioning

confidence: 99%

“…Extracellular biosynthesis occurs outside bacterial cell either using bacterial biomass, the supernatant of bacterial cultures, or cell free extracts. An organic base is used in the supernatant to ensure the proper recovery of AgNPs by centrifugation and further resuspension [67]. Extracellular biosynthesis is preferred over the intracellular process as it does not require downstream processing one of the first bacteria used for the synthesis of AgNPs by culturing in high concentrations of AgNO 3 was Pseudomonas stutzeri AG29, a silver-resistant bacterium isolated from a silver mine which reduces Ag + to Ag 0 with accumulation inside the cell [68].…”

Section: Green Chemistrymentioning

confidence: 99%

Section: Green Chemistrymentioning

confidence: 99%

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Metal-Based Nanoparticles as Antimicrobial Agents: An Overview

et al. 2020

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Metal-based nanoparticles have been extensively investigated for a set of biomedical applications. According to the World Health Organization, in addition to their reduced size and selectivity for bacteria, metal-based nanoparticles have also proved to be effective against pathogens listed as a priority. Metal-based nanoparticles are known to have non-specific bacterial toxicity mechanisms (they do not bind to a specific receptor in the bacterial cell) which not only makes the development of resistance by bacteria difficult, but also broadens the spectrum of antibacterial activity. As a result, a large majority of metal-based nanoparticles efficacy studies performed so far have shown promising results in both Gram-positive and Gram-negative bacteria. The aim of this review has been a comprehensive discussion of the state of the art on the use of the most relevant types of metal nanoparticles employed as antimicrobial agents. A special emphasis to silver nanoparticles is given, while others (e.g., gold, zinc oxide, copper, and copper oxide nanoparticles) commonly used in antibiotherapy are also reviewed. The novelty of this review relies on the comparative discussion of the different types of metal nanoparticles, their production methods, physicochemical characterization, and pharmacokinetics together with the toxicological risk encountered with the use of different types of nanoparticles as antimicrobial agents. Their added-value in the development of alternative, more effective antibiotics against multi-resistant Gram-negative bacteria has been highlighted.

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Section: Green Chemistrymentioning

confidence: 99%

Section: Green Chemistrymentioning

confidence: 99%

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Metal-Based Nanoparticles as Antimicrobial Agents: An Overview

et al. 2020

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“…15,120 In the quest for more efficient antimycobacterial drugs that are able to overcome the "classical" issues discussed above and partially responsible for the global TB status, the antibacterial peptides and nanoparticles gained recently special attention. 19,121 Several classes of nanoparticles with intrinsic antibacterial and antibiofilm effects are proven, 122 including metallic nanoparticles (e.g copper, 123 iron, 124 gold 125 or silver-based 126 ), carbon nanotubes, 127 polysaccharides as chitosan 128 and chitosan in conjunction with polycationic polymer 129 or combinations of the above-mentioned antibacterial molecules as chitosan-gold NP. 130 Among these antibacterial nanoparticles, due to their strong antibacterial activity and long-history of using silver as antiseptic, AgNPs have received most of the attention.…”

Section: Silver Nanoparticles As An Emerging Therapeutic Approach In mentioning

confidence: 99%

<p>Silver Nanoparticles for the Therapy of Tuberculosis</p>

Tabaran

Matea²,

Mocan³

et al. 2020

IJN

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Rapid emergence of aggressive, multidrug-resistant Mycobacteria strain represents the main cause of the current antimycobacterial-drug crisis and status of tuberculosis (TB) as a major global health problem. The relatively low-output of newly approved antibiotics contributes to the current orientation of research towards alternative antibacterial molecules such as advanced materials. Nanotechnology and nanoparticle research offers several exciting new-concepts and strategies which may prove to be valuable tools in improving the TB therapy. A new paradigm in antituberculous therapy using silver nanoparticles has the potential to overcome the medical limitations imposed in TB treatment by the drug resistance which is commonly reported for most of the current organic antibiotics. There is no doubt that AgNPs are promising future therapeutics for the medication of mycobacterial-induced diseases but the viability of this complementary strategy depends on overcoming several critical therapeutic issues as, poor delivery, variable intramacrophagic antimycobacterial efficiency, and residual toxicity. In this paper, we provide an overview of the pathology of mycobacterial-induced diseases, andhighlight the advantages and limitations of silver nanoparticles (AgNPs) in TB treatment.

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“…A number of review articles have been authored which give useful overviews of bacteriogenic metallic nanoparticle synthesis. (14,15,(17)(18)(19)(20)(21)(22) However, to date, no in-depth summary of findings has been published relating to the reaction conditions under which AgNPs are synthesised and the impact that these conditions have on the products. Therefore, this article aims to bring together such results and discuss how biosynthetic reaction parameters can be used to optimise AgNP production with a focus on shape and size control.…”

Section: Introductionmentioning

confidence: 99%

Bacteria and nanosilver: the quest for optimal production

Mabey

Cristaldi

Oyston

et al. 2019

Critical Reviews in Biotechnology

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Silver nanoparticles (AgNPs) have potential uses in many applications, but current chemical production methods are challenged by scalability, limited particle stability, and the use of hazardous chemicals. The biological processes present in bacteria to mitigate metallic contaminants in their environment present a potential solution to these challenges. Before commercial exploitation of this technology can be achieved, the quality of bacteriogenic AgNPs needs to be improved for certain applications. While the colloidal and morphological stabilities of biogenic AgNPs are widely regarded as superior to chemogenic particles, little control over the synthesis of particle morphologies has been achieved in biological systems. This article reviews a range of biosynthetic reaction conditions and how they affect AgNP formation in bacteria to understand which are most influential. While there remains uncertainty, some general trends are emerging: higher Ag + concentrations result in higher AgNP production, up to a point at which the toxic effects begin to dominate; the optimal temperature appears to be heavily species-dependent and linked to the optimal growth temperature of the organism. However, hotter conditions generally favour higher production rates, while colder environments typically give greater shape diversity. Little attention has been paid to other potentially important growth conditions including halide concentrations, oxygen exposure, and irradiation with light. To fully exploit biosynthetic production routes as alternatives to chemical methods, hurdles remain with controlling particle morphologies and require further work to elucidate and harness. By better understanding the factors influencing AgNP production a foundation can be laid from which shape-controlled production can be achieved.

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Diversity of Bacterial Synthesis of Silver Nanoparticles

Cited by 118 publications

References 207 publications

Metal-Based Nanoparticles as Antimicrobial Agents: An Overview

Metal-Based Nanoparticles as Antimicrobial Agents: An Overview

<p>Silver Nanoparticles for the Therapy of Tuberculosis</p>

Bacteria and nanosilver: the quest for optimal production

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