Synthesis of Platinum Nanoparticles by Reaction of Filamentous Cyanobacteria with Platinum(IV)−Chloride Complex

Lengke, Maggy F.; Fleet, Michael E.; Southam, Gordon

doi:10.1021/la060873s

Cited by 153 publications

(63 citation statements)

References 30 publications

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“…Experiments were maintained in the dark because platinum in solution is unstable when exposed to light [38]. Micro-centrifuge tubes containing the bacteria-platinum mixture were only removed from darkness to be vortexed weekly during the longer exposure times.…”

Section: Metallidurans and Aqueous Platinum Experimentsmentioning

confidence: 99%

“…The oxidation state of platinum can be determined by XANES while information regarding the binding partners and local coordination of platinum is provided by EXAFS data. Determining the oxidation state and binding partners of platinum will shed light on how aqueous platinum binds to bacterial cells [38]. X-ray Absorption Spectroscopy energy measurements of the Pt-L 3 edge were collected from each sample and were calibrated to the inflection of the Pt foil edge at 11,564 eV [47].…”

Section: X-ray Absorption Spectroscopy (Xas) Data Collectionmentioning

confidence: 99%

“…Linear combination fitting in ATHENA mathematically identified which standard(s) aligned with the energy edge of the immobilized platinum. Energy position alignment corresponded to the oxidation state of the immobilized platinum [38]. EXAFS data analysis was performed in ARTEMIS, a XAS analysis software program complimentary to ATHENA [48].…”

Section: Xas Data Analysismentioning

confidence: 99%

“…Mathematical derivatives of post edge energy peaks from the bound platinum in the bacterial samples were fitted to post edge energy peaks from the platinum in the standards. Peak alignment, normalized to platinum chloride standards, indicated potential binding partners of the immobilized platinum [38].…”

Section: Xas Data Analysismentioning

confidence: 99%

“…Lengke et al [38] demonstrated that cyanobacteria are able to reduce aqueous Pt(IV) species in a stepwise reaction that first produces intracellular and extracellular spherical platinum (II) organic nano-condensates. The amorphous platinum (II) colloids then experienced further diagenesis to produce crystalline, elemental platinum.…”

Section: Introductionmentioning

confidence: 99%

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Immobilisation of Platinum by Cupriavidus metallidurans

et al. 2018

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Abstract:The metal resistant bacterium Cupriavidus metallidurans CH34, challenged with aqueous platinous and platinic chloride, rapidly immobilized platinum. XANES/EXAFS analysis of these reaction systems demonstrated that platinum binding shifted from chloride to carboxyl functional groups within the bacteria. Pt(IV) was more toxic than Pt(II), presumably due to the oxidative stress imparted by the platinic form. Platinum immobilisation increased with time and with increasing concentrations of platinum. From a bacterial perspective, intracellular platinum concentrations were two to three orders of magnitude greater than the fluid phase, and became saturated at almost molar concentrations in both reaction systems. TEM revealed that C. metallidurans was also able to precipitate nm-scale colloidal platinum, primarily along the cell envelope where energy generation/electron transport occurs. Cells enriched in platinum shed outer membrane vesicles that were enriched in metallic, colloidal platinum, likely representing an important detoxification strategy. The formation of organo-platinum compounds and membrane encapsulated nanophase platinum, supports a role for bacteria in the formation and transport of platinum in natural systems, forming dispersion halos important to metal exploration.

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Section: Metallidurans and Aqueous Platinum Experimentsmentioning

confidence: 99%

Section: X-ray Absorption Spectroscopy (Xas) Data Collectionmentioning

confidence: 99%

Section: Xas Data Analysismentioning

confidence: 99%

Section: Xas Data Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Immobilisation of Platinum by Cupriavidus metallidurans

et al. 2018

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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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