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FRET between CdSe quantum dots in lipid vesicles and water- and lipid-soluble dyes

Kloepfer, J.A., Cohen, N. and Nadeau, J.L. (2004) FRET between CdSe quantum dots in lipid vesicles and water- and lipid-soluble dyes. Journal of Physical Chemistry B, 108 (44). pp. 17042-17049. ISSN 1520-5207

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Abstract

Because of the coatings needed to solubilize and passivate quantum dots for biological applications, their use in fluorescent resonance energy transfer (FRET) has been limited. However, hydrophobic particles without polymer coatings may be embedded into lipid membranes, as demonstrated here with biomimetic vesicles. FRET is seen to a lipid-soluble dye (DiD) and a water-soluble dye (Cy3.5) in which the vesicles are suspended. The degree of energy transfer to each dye suggests that most of the QDs are located deep within the lipid, as confirmed by electron microscopy of whole mounts and thin sections of vesicles. Energy transfer is also seen to a voltage-sensitive, lipid-soluble dye (di-4-ANEPPS) only when the potassium ionophore valinomycin is present in the membrane. The effect is dependent upon potassium ion concentration rather than absolute membrane potential.

Item Type: Article
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Computing (Leeds)
Depositing User: Miss Jamie Grant
Date Deposited: 10 Mar 2009 19:03
Last Modified: 15 Sep 2014 01:39
Published Version: http://dx.doi.org/10.1021/jp048094c
Status: Published
Publisher: American Physical Society
Identification Number: 10.1021/jp048094c
URI: http://eprints.whiterose.ac.uk/id/eprint/7959

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