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Synthesis, photophysical study and BSA association of water-insoluble squaraine dyes

Paper ID Volume ID Publish Year Pages File Format Full-Text
26645 43969 2013 7 PDF Available
Title
Synthesis, photophysical study and BSA association of water-insoluble squaraine dyes
Abstract

In this work, the synthesis, spectroscopic characterisation, photophysical study and bovine serum albumin association of water-insoluble squaraine dyes are described. The photophysical behaviour of the dyes was investigated using UV–vis and steady-state fluorescence in solution, as well as its association with bovine serum albumin in phosphate buffer solution. No squaraine aggregation was observed in organic solvents, but a J-type aggregation could be observed in phosphate buffer solution. In the absence of protein, the J-aggregation promoted the fluorescence quenching; however, upon addition of protein, the fluorescence intensity increased by a factor of up to 80. Additionally, a linear relationship between the fluorescence intensity and the protein concentration could be observed for the squaraine dyes in a concentration range around 0.02–0.10 μM.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Three water-insoluble squaraine dyes based on indoleninium and benzothiazolium moieties were synthesised. ► The dyes presented intense absorption and fluorescence emission in the red region. ► In the phosphate buffer solution and absence of bovine serum albumin the squaraine dyes were almost nonfluorescent. ► The fluorescence intensities of the dyes increased with addition of protein in the buffer/dye solutions.

Keywords
Squaraine dyes; Photophysical characterisation; BSA association
First Page Preview
Synthesis, photophysical study and BSA association of water-insoluble squaraine dyes
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 252, 15 January 2013, Pages 77–83
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering