The effect of thiosulfate-oxidizing bacteria on the stability of the gold-thiosulfate complex

Lengke, Maggy F.; Southam, Gordon

doi:10.1016/j.gca.2005.03.012

Cited by 83 publications

(44 citation statements)

References 34 publications

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“…The precipitation of gold from gold(I) thiosulphate solutions has been observed in the presence of thiosulphate-oxidizing bacteria (Figures 3b and c; A. thiooxidans; Lengke and Southam, 2005). The gold precipitated by A. thiooxidans was accumulated inside the bacterial cells as fine-grained colloids ranging between 5 and 10 nm in diameter and in the bulk fluid phase as crystalline micrometre-scale gold (Lengke and Southam, 2005).…”

Section: Advantages Of Active Gold Bioaccumulationmentioning

confidence: 90%

“…Laboratory studies have been conducted to elucidate the interactions of gold with microorganisms using gold(III) chloride- (Beveridge and Murray, 1976;Darnall et al, 1986;Greene et al, 1986;Watkins et al, 1987;Gee and Dudeney, 1988;Karamushka et al, 1990a, b;Dyer et al, 1994;Beveridge, 1994, 1996;Canizal et al, 2001;Kashefi et al, 2001;Karthikeyan and Beveridge, 2002;Nair and Pradeep, 2002;Ahmad et al, 2003;Nakajima, 2003;Tsuruta, 2004;Keim and Farina, 2005;Lengke et al, 2006aLengke et al, , b, c, 2007, gold(I) thiosulphate- (Lengke and Southam, 2005, 2006, 2007Lengke et al, 2006a), gold L-asparagine- (Southam et al, 2000), aurothiomalate-complexes (Higham et al, 1986) and colloidal gold-containing solutions (Karamushka et al, 1987b(Karamushka et al, , 1990bUlberg et al, 1992). In study with 30 different microorganisms (eight bacteria, nine actinomycetes, eight fungi and five yeasts, Nakajima (2003) found that the bacteria were more efficient in removing gold(I/III) complexes from solution than other groups of microorganisms.…”

Section: Bioaccumulation Of Gold By Microorganismsmentioning

confidence: 99%

“…The gold precipitated by A. thiooxidans was accumulated inside the bacterial cells as fine-grained colloids ranging between 5 and 10 nm in diameter and in the bulk fluid phase as crystalline micrometre-scale gold (Lengke and Southam, 2005). While gold was deposited throughout the cell, it was concentrated along the cytoplasmic membrane, suggesting that gold precipitation was likely enhanced via electron transport processes associated with energy generation (Figures 3b and c; Figure 4).…”

Section: Advantages Of Active Gold Bioaccumulationmentioning

confidence: 99%

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The geomicrobiology of gold

et al. 2007

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Microorganisms capable of actively solubilizing and precipitating gold appear to play a larger role in the biogeochemical cycling of gold than previously believed. Recent research suggests that bacteria and archaea are involved in every step of the biogeochemical cycle of gold, from the formation of primary mineralization in hydrothermal and deep subsurface systems to its solubilization, dispersion and re-concentration as secondary gold under surface conditions. Enzymatically catalysed precipitation of gold has been observed in thermophilic and hyperthermophilic bacteria and archaea (for example, Thermotoga maritime, Pyrobaculum islandicum), and their activity led to the formation of gold-and silver-bearing sinters in New Zealand's hot spring systems. Sulphatereducing bacteria (SRB), for example, Desulfovibrio sp., may be involved in the formation of goldbearing sulphide minerals in deep subsurface environments; over geological timescales this may contribute to the formation of economic deposits. Iron-and sulphur-oxidizing bacteria (for example, Acidothiobacillus ferrooxidans, A. thiooxidans) are known to breakdown gold-hosting sulphide minerals in zones of primary mineralization, and release associated gold in the process. These and other bacteria (for example, actinobacteria) produce thiosulphate, which is known to oxidize gold and form stable, transportable complexes. Other microbial processes, for example, excretion of amino acids and cyanide, may control gold solubilization in auriferous top-and rhizosphere soils. A number of bacteria and archaea are capable of actively catalysing the precipitation of toxic gold(I/ III) complexes. Reductive precipitation of these complexes may improve survival rates of bacterial populations that are capable of (1) detoxifying the immediate cell environment by detecting, excreting and reducing gold complexes, possibly using P-type ATPase efflux pumps as well as membrane vesicles (for example, Salmonella enterica, Cupriavidus (Ralstonia) metallidurans, Plectonema boryanum); (2) gaining metabolic energy by utilizing gold-complexing ligands (for example, thiosulphate by A. ferrooxidans) or (3) using gold as metal centre in enzymes (Micrococcus luteus). C. metallidurans containing biofilms were detected on gold grains from two Australian sites, indicating that gold bioaccumulation may lead to gold biomineralization by forming secondary 'bacterioform' gold. Formation of secondary octahedral gold crystals from gold(III) chloride solution, was promoted by a cyanobacterium (P. boryanum) via an amorphous gold(I) sulphide intermediate. 'Bacterioform' gold and secondary gold crystals are common in quartz pebble conglomerates (QPC), where they are often associated with bituminous organic matter possibly derived from cyanobacteria. This may suggest that cyanobacteria have played a role in the formation of the Witwatersrand QPC, the world's largest gold deposit.

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Section: Advantages Of Active Gold Bioaccumulationmentioning

confidence: 90%

Section: Bioaccumulation Of Gold By Microorganismsmentioning

confidence: 99%

Section: Advantages Of Active Gold Bioaccumulationmentioning

confidence: 99%

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The geomicrobiology of gold

et al. 2007

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“…As compared to the case with At. thiooxidans [33], it was possible to rapidly produce bio-AuNPs by using Ac. aromatica with addition of formate as e-donor.…”

Section: Au(iii) Biosorption and Bioreductionmentioning

confidence: 99%

“…However, to our knowledge, the only acidophilic extremophile so far tested for bio-AuNPs production is the autotrophic S-oxidizer, Acidithiobacillus (At) thiooxidans. The bacterium deposited fine-grained Au(0) colloids (5-10 nm), by utilizing Au(S 2 O 3 ) 2 3− as an energy source, throughout the cell, especially along the cytoplasmic membrane [33]. In both neutrophilic and acidophilic bacterial AuNPs studies, as described above, attempts to control the particle size have been hardly reported.…”

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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Liquid‐Phase Synthesis of Inorganic Nanoparticles

Caruntu

O’Connor

2005

Encyclopedia of Inorganic Chemistry

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In this article we review some of the most representative liquid‐phase synthetic methodologies for the preparation of inorganic nanoparticles. Metallic nanoparticles and alloys have been chosen as a model to discuss the preparation of colloidal nanocrystals and their functionalization with organic molecules. Of a particular interest have been the synthetic methodologies allowing not only the compositional control of the nanoparticles but also the size/shape of the nanoparticles along with their ability to organize into hierarchical architectures suitable for different technological applications.

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The effect of thiosulfate-oxidizing bacteria on the stability of the gold-thiosulfate complex

Cited by 83 publications

References 34 publications

The geomicrobiology of gold

The geomicrobiology of gold

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

Liquid‐Phase Synthesis of Inorganic Nanoparticles

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