EurekaMag.com logo
+ Translate

Direct determination of oxidation state of gold deposits in metal-reducing bacterium Shewanella algae using X-ray absorption near-edge structure spectroscopy (XANES)


, : Direct determination of oxidation state of gold deposits in metal-reducing bacterium Shewanella algae using X-ray absorption near-edge structure spectroscopy (XANES). Journal of Bioscience and Bioengineering 103(6): 568-571

X-ray absorption near-edge structure spectroscopy (XANES) was successfully employed to determine the gold valence in the metal-reducing bacterium Shewanella algae after exposure to a 1 mM aqueous HAuCl4 solution for 10-120 min. XANES spectra revealed the oxidation state of gold in the bacterial cells to be Au(0) without any contribution from Au(Ill), demonstrating that S. algae cells can reduce AuCl4- ions to elemental gold. Transmission electron microscopy (TEM) and energy dispersive X-ray (EDX) analysis confirmed that gold nanoparticles 5-15 nm in size were deposited in the periplasmic space of the bacterial cells; a preferable, cell surface location for the easy recovery of biogenic nanoparticles.

(PDF same-day service: $19.90)

Accession: 015516310

PMID: 17630130

DOI: 10.1263/jbb.103.568

Submit PDF Full Text: Here


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Related references

Schulze, D.G.; Sutton, S.R.; Bajt, S., 1995: Determining manganese oxidation state in soils using X-ray absorption near-edge structure (XANES) spectroscopy. The redox chemistry of soil Mn is important in Mn uptake by plants, the movement of trace elements absorbed on or occluded in Mn-oxides, and the etiology of some soil-borne plant fungal diseases. The objectives of this study were to develop calibr...

Nunes, C.A.; Resende, E.C.; Aes, I.Guimar.R.; Anastácio, A.S.; Guerreiro, Mário.C., 2011: In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods. A goethite-based catalyst was evaluated using in-situ X-ray absorption near-edge structure (XANES) spectroscopy during methane oxidation under increasing reaction temperature. Determination of rank by median absolute deviation (DRMAD), evolving fa...

Christensen, C.R.; Cutler, J.N.; Christensen, D.A., 2004: Using X-ray absorption near edge structure (XANES) spectroscopy to determine selenium oxidation states in animal mineral supplements and feeds. Synchrotron-based X-ray absorption near edge structure (XANES) spectroscopy is a relatively new technique within the life sciences. XANES has been utilized to identify the location, oxidation state and spatial distribution of heavy metal elements...

Takahashi Y.; Kolonin G.R.; Shironosova G.P.; Kupriyanova I.I.; Uruga T.; Shimizu H., 2005: Determination of the Eu(II)/ Eu(III) ratios in minerals by X-ray absorption near-edge structure (XANES) and its application to hydrothermal deposits. Europium L (sub III) -edge X-ray absorption near-edge structure (XANES) was employed to determine the Eu(II)/Eu(III) ratios in minerals. This ratio can be determined based on the peak-area ratio of white lines, the resonance peak, in normalized XA...

Yamamoto, Yuhei; Takahashi, Yoshio; Kanai, Yutaka; Watanabe, Yoshio; Uruga, Tomoya; Tanida, Hajime; Terada, Yasuko; Shimizu, Hiroshi, 2008: High-sensitive measurement of uranium LIII -edge X-ray absorption near-edge structure XANES for the determination of the oxidation states of uranium in crustal materials. The uranium L(III) -edge XANES spectra for natural rocks at the concentration range of 0.96-124 mg kg(-1) were measured using a log spiral bent crystal Laue analyzer (BCLA) combined with a multi-element Ge detector. It was found that the quality o...

Vairavamurthy Appathural; Manowitz Bernard; Zhou Weiqing; Jeon Yongseog, 1994: Determination of hydrogen sulfide oxidation products by sulfur K-edge X-ray absorption near-edge structure spectroscopy. ACS Symposium Series 550: 412-430

Sutton S.R.; Delaney J.; Bajt S.; Rivers M.L.; Smith J.V., 1993: Microanalysis of iron oxidation state in iron oxides using X-ray absorption near edge structure (XANES). Abstracts of Papers Submitted to the Lunar and Planetary Science Conference 24: 1385-1386

Dauphin Yannicke; Cuif Jean Pierre; Salome Murielle; Susini Jean, 2005: Speciation and distribution of sulfur in a mollusk shell as revealed by in situ maps using X-ray absorption near-edge structure (XANES) spectroscopy at the S K-edge. The microstructure and composition, including chemical speciation of S, of the calcitic and aragonitic shell layers of two mollusc shells were investigated using a combination of thermogravimetric analyses, scanning electron microscopy, electron p...

Gu, W.; Wang, H.; Wang, K., 2014: Nickel L-edge and K-edge X-ray absorption spectroscopy of non-innocent Ni[S₂C₂(CF₃)₂]₂(n) series (n = -2, -1, 0): direct probe of nickel fractional oxidation state changes. A series of nickel dithiolene complexes Ni[S2C2(CF3)2]2(n) (n = -2, -1, 0) has been investigated using Ni L- and K-edge X-ray absorption spectroscopy (XAS). The L3 centroid shifts about 0.3 eV for a change of one unit in the formal oxidation state...

Dauphin, Y.; Cuif, J.P.; Doucet, J.; Salome, M.; Susini, J.; Williams, C.T., 2003: In situ mapping of growth lines in the calcitic prismatic layers of mollusc shells using X-ray absorption near-edge structure (XANES) spectroscopy at the sulphur K-edge. The microstructure and composition, including chemical speciation of sulphur (S), of two mollusc shells were investigated using a combination of scanning electron microscopy, X-ray absorption near-edge structure spectroscopy (XANES) and electron p...