Spectral Properties of an Indotricarbocyanine Dye upon Complexation by Detonation Nanodiamonds and Blood Serum Proteins

Spectral properties of an indotricarbocyanine dye upon complexation with nanodiamonds in aqueous solutions were studied. Complexation was accompanied by disappearance of the H * -aggregate absorption band at 514 nm and a bathochromic shift of long-wavelength absorption maxima from 706 to 718 nm. The...

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Bibliographic Details
Published in:Journal of applied spectroscopy 2020-07, Vol.87 (3), p.412-420
Main Authors: Belko, N. V., Samtsov, M. P., Gusakov, G. A., Khludeev, I. I., Lugovski, A. P., Lugovski, A. A.
Format: Article
Language:English
Subjects:
Absorption spectra
Analysis
Analytical Chemistry
Anisotropy
Aqueous solutions
Atomic/Molecular Structure and Spectra
Biological products
Biosensors
Blood
Blood proteins
Chemical bonds
Complexation
Detonation
Diamonds
Dyes
Fluorescence
Fluorescence spectroscopy
Infrared analysis
Nanostructure
Physics
Physics and Astronomy
Protein binding
Proteins
Serum proteins
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Summary:Spectral properties of an indotricarbocyanine dye upon complexation with nanodiamonds in aqueous solutions were studied. Complexation was accompanied by disappearance of the H * -aggregate absorption band at 514 nm and a bathochromic shift of long-wavelength absorption maxima from 706 to 718 nm. The dye emission spectrum was almost unchanged. The fluorescence excitation peak shifted from 706 to 710 nm. The dye carboxyl groups played an important role in the complexation of the dye to nanodiamonds based on an analysis of the IR absorption spectra. The complexes broke down and the dye molecules bonded to serum proteins in the presence of human blood serum. This was confirmed by significant increases in the fluorescence lifetime and anisotropy. The obtained complexes could be used as a basis for fluorescent biosensors.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-020-01016-z