Bioaccumulation of gold by sulfate-reducing bacteria cultured in the presence of gold(I)-thiosulfate complex

Lengke, Maggy F.; Southam, Gordon

doi:10.1016/j.gca.2006.04.018

Cited by 184 publications

(73 citation statements)

References 43 publications

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“…Green chemistry methods using biological systems such plants, bacteria, fungus and similar organisms are an attractive and environmentally friendly alternative to chemical and physical methods. [8][9][10][11][12] Plant based synthesis of nanoparticles is normally carried out at moderate temperatures and pH values at atmospheric pressure. The green chemistry based approach also has the advantages of being straightforward processing and eco-friendly.…”

Section: Introductionmentioning

confidence: 99%

Biosynthesis of silver nanoparticles using indigenous Xanthorrhoea glauca leaf extract and their antibacterial activity against Escherichia coli and Staphylococcus epidermis

2016

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Section: Introductionmentioning

confidence: 99%

Biosynthesis of silver nanoparticles using indigenous Xanthorrhoea glauca leaf extract and their antibacterial activity against Escherichia coli and Staphylococcus epidermis

2016

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“…For instance, for approximately 3.5 billion years sulfate-reducing bacteria (SRB), which are anaerobic, heterotrophic bacteria that reduce sulfate and thiosulfate to hydrogen sulfide (H 2 S) and release it as a by-product of metabolism, have been active. Modern SRB, e.g., Desulfovibrio spp., are able to reduce the thiosulfate from mobile gold thiosulfate complexes; this destabilizes gold in solution, which may then be precipitated intracellularly or incorporated into the newly forming sulfide minerals [17,18]. This allows for the formation of metallogenically enhanced sedimentary sequences, which are ideal source rocks for hydrothermal gold deposits.…”

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confidence: 99%

Geobiological Cycling of Gold: From Fundamental Process Understanding to Exploration Solutions

et al. 2013

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Microbial communities mediating gold cycling occur on gold grains from (sub)-tropical, (semi)-arid, temperate and subarctic environments. The majority of identified species comprising these biofilms are β-Proteobacteria. Some bacteria, e.g., Cupriavidus metallidurans, Delftia acidovorans and Salmonella typhimurium, have developed biochemical responses to deal with highly toxic gold complexes. These include gold specific sensing and efflux, co-utilization of resistance mechanisms for other metals, and excretion of gold-complex-reducing siderophores that ultimately catalyze the biomineralization of nano-particulate, spheroidal and/or bacteriomorphic gold. In turn, the toxicity of gold complexes fosters the development of specialized biofilms on gold grains, and hence the cycling of gold in surface environments. This was not reported on isoferroplatinum grains under most near-surface environments, due to the lower toxicity of mobile platinum complexes. The discovery of gold-specific microbial responses can now drive the development of geobiological exploration tools, e.g., gold bioindicators and biosensors. Bioindicators employ genetic markers from soils and groundwaters to provide information about gold mineralization processes, while biosensors will allow in-field analyses of gold concentrations in complex sampling media.

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“…(a few nano-to micro-size, extra-and intracellular [15][16][17][18][19][20]); Lactobacillus spp. (5-30 nm, intracellular [21]; 20-50 nm and >100 nm, extra-and intracellular [22]); Pseudomonas aeruginosa (15-30 nm, extracellular [23]); Escherichia coli and Desulfovibrio desulfuricans (20-50 nm, intracellular; [24]); a range of dissimilatory Fe(III)-reducing bacteria/archaea including Pyrobaculum islandicum, Pyrococcus furiosus, Thermotoga maritima, Shewanella algae, Geobacter sulfurreducens and Geovibrio ferrireducens (nano-size, intracellular [25,26]); Rhodopseudomonas capsulate (10-20 nm, extracellular [27]); Rhodobacter capsulatus (<50 nm, extra-and intracellular [28]), Stenotrophomonas maltophilia (40 nm, intracellular [29]), Ralstonia metallidurans (extra-and intracellular [30]), sulfate-reducing bacteria (mostly <10 nm, extra-and intracellular [31]), and the radiation-resistant Deinococcus radiodurans (44 nm, extra-and intracellular [32]). …”

Section: Introductionmentioning

confidence: 99%

Size-Controlled Production of Gold Bionanoparticles Using the Extremely Acidophilic Fe(III)-Reducing Bacterium, Acidocella aromatica

Rizki¹,

Okibe²

2018

Minerals

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Recycling of gold-bearing "urban mine" resources, such as waste printed circuit boards (PCBs), is attracting an increasing interest. Some of the gold leaching techniques utilize acidic lixiviants and in order to eventually target such acidic leachates, the utility of the acidophilic Fe(III)-reducing heterotrophic bacterium, Acidocella (Ac.) aromatica PFBC was evaluated for production of Au (0) bionanoparticles (bio-AuNPs). Au(III) ions (as AuCl 4 − , initially 10 mg/L), were readily adsorbed onto the slightly-positively charged Ac. aromatica cell surface and transported into cytoplasm to successfully form intracellular bio-AuNPs in a simple one-step microbiological reaction. Generally, increasing the initial concentration of formate as e-donor corresponded to faster Au(III) bioreduction and a greater number of Au(0) nucleation sites with less crystal growth within 40-60 h: i.e., use of 1, 5, 10, or 20 mM formate led to production of bio-AuNPs of 48, 24, 13, or 12 nm in mean particle size with 2.3, 17, 62, and 97 particles/cell, respectively. Addition of Cu 2+ as an enzymatic inhibitor significantly decreased the number of Au(0) nucleation sites but enhanced crystal growth of individual particles. As a result, the manipulation of the e-donor concentration combined with an enzyme inhibitor enabled the 3-grade size-control of bio-AuNPs (nearly within a normal distribution) at 48, 26 or 13 nm by use of 1 mM formate, 20 mM formate (+Cu 2+ ) or 10 mM formate, respectively, from highly acidic, dilute Au(III) solutions.

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Bioaccumulation of gold by sulfate-reducing bacteria cultured in the presence of gold(I)-thiosulfate complex

Cited by 184 publications

References 43 publications

Biosynthesis of silver nanoparticles using indigenous Xanthorrhoea glauca leaf extract and their antibacterial activity against Escherichia coli and Staphylococcus epidermis

Biosynthesis of silver nanoparticles using indigenous Xanthorrhoea glauca leaf extract and their antibacterial activity against Escherichia coli and Staphylococcus epidermis

Geobiological Cycling of Gold: From Fundamental Process Understanding to Exploration Solutions

Size-Controlled Production of Gold Bionanoparticles Using the Extremely Acidophilic Fe(III)-Reducing Bacterium, Acidocella aromatica

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