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  Characterization of the fluorescence correlation spectroscopy (FCS) standard Rhodamine 6G and calibration of its diffusion coefficient in aqueous solutions

Majer, G., & Melchior, J. P. (2014). Characterization of the fluorescence correlation spectroscopy (FCS) standard Rhodamine 6G and calibration of its diffusion coefficient in aqueous solutions. The Journal of Chemical Physics, 140(9): 094201, pp. 1-6. doi:10.1063/1.4867096.

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JChemPhys_140_2014_094201.pdf (beliebiger Volltext), 559KB
 
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 Urheber:
Majer, Günter1, Autor           
Melchior, Jan P., Autor
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1Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_2364731              

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 Zusammenfassung: Precise diffusion measurements of rhodamine 6G (Rh6G) dissolved in D2O at concentrations between 50 and 200 μM were carried out in the temperature range from 280 to 320 K using pulsed field gradient nuclear magnetic resonance (PFG-NMR). The obtained diffusion coefficients can be used as a calibration reference in fluorescence correlation spectroscopy (FCS). Besides measuring the diffusivity of Rh6G, the diffusion coefficient of the solvent in the same system could be determined in parallel by PFG-NMR as the resonances of water and Rh6G are well separated in the (1)H NMR spectrum. To analyze the differences due to the isotope effect of the solvent (D2O vs. H2O), the correlation time τD of Rh6G was measured by FCS in both D2O and H2O. The obtained isotopic correction factor, τD(D2O)/τD(H2O) = 1.24, reflects the isotope effect of the solvent´s self-diffusion coefficients as determined previously by PFG-NMR.

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Sprache(n): eng - English
 Datum: 2013-12-062014-02-172014-03-062014-03-07
 Publikationsstatus: Erschienen
 Seiten: 6
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 Art der Begutachtung: Expertenbegutachtung
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Titel: The Journal of Chemical Physics
  Andere : J. Chem. Phys.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, N.Y. : American Institute of Physics
Seiten: - Band / Heft: 140 (9) Artikelnummer: 094201 Start- / Endseite: 1 - 6 Identifikator: ISSN: 0021-9606
CoNE: https://pure.mpg.de/cone/journals/resource/954922836226