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Issue 6, 2017
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Analytical form of the autocorrelation function for the fluorescence correlation spectroscopy

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Abstract

Fluorescence correlation spectroscopy (FCS) can provide information about diffusion coefficients and rate constants of chemical reactions in small systems of interacting molecules. However, the interpretation of FCS experiments depends crucially on the model of the autocorrelation function for the fluorescence intensity fluctuations. In this theoretical work, we consider a system of fluorescent molecules that diffuse and interact with massive particles, e.g. surfactant micelles. Using the general formalism of FCS, we derive a new analytical approximation of the autocorrelation function for systems in which both diffusion and a binary reaction occur. This approximation provides a smooth interpolation between the limit of fast reaction (much faster than diffusion), and the opposite limit of slow reaction. Our studies of noncovalent interactions of micelles with dyes by FCS provided an experimental case to which the approximate autocorrelation function was successfully applied [X. Zhang, A. Poniewierski, A. Jelińska, A. Zagożdżon, A. Wisniewska, S. Hou and R. Hołyst, Soft Matter, 2016, 12, 8186–8194].

Graphical abstract: Analytical form of the autocorrelation function for the fluorescence correlation spectroscopy

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Publication details

The article was received on 23 Nov 2016, accepted on 10 Jan 2017 and first published on 13 Jan 2017


Article type: Paper
DOI: 10.1039/C6SM02643E
Citation: Soft Matter, 2017,13, 1267-1275
  • Open access: Creative Commons BY-NC license
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    Analytical form of the autocorrelation function for the fluorescence correlation spectroscopy

    R. Hołyst, A. Poniewierski and X. Zhang, Soft Matter, 2017, 13, 1267
    DOI: 10.1039/C6SM02643E

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