Spatial fluorescence cross-correlation spectroscopy by means of a spatial light modulator

✍ Scribed by Yoann Blancquaert; Jie Gao; Jacques Derouard; Antoine Delon

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 325 KB
• Volume: 1
• Category: Article
• ISSN: 1864-063X
• DOI: 10.1002/jbio.200810007

✦ Synopsis

Abstract

Spatial fluorescence cross‐correlation spectroscopy is a rarely investigated version of fluorescence correlation spectroscopy, in which the fluorescence signals from different observation volumes are cross‐correlated. In the reported experiments, two observation volumes, typically shifted by a few μm, are produced, with a spatial light modulator and two adjustable pinholes. We illustrated the feasibility and potentiality of this technique by: i) measuring molecular flows, in the range 0.2–1.5 μm/ms, of solutions seeded with fluorescent nanobeads or rhodamine molecules (simulating active transport phenomenons); ii) investigating the permeability of the phospholipidic membrane of giant unilamellar vesicles versus hydrophilic or hydrophobic molecules (in that case the laser spots were set on both sides of the membrane). Theoretical descriptions are proposed together with a discussion about fluorescence‐correlation‐spectroscopy‐based, alternative methods. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)