Novel squarylium dyes for detection of amyloid fibrils in vitro

Bìofìzičnij Vìsnik. 2015;2(32):61-68


Journal Homepage

Journal Title: Bìofìzičnij Vìsnik

ISSN: 2075-3810 (Print); 2075-3829 (Online)

Publisher: V.N. Karazin Kharkiv National University

Society/Institution: V.N. Karazin Kharkiv National University

LCC Subject Category: Medicine: Medicine (General): Medical physics. Medical radiology. Nuclear medicine

Country of publisher: Ukraine

Language of fulltext: Russian, Ukrainian, English

Full-text formats available: PDF



K. O. Vus
V. M. Trusova
G. P. Gorbenko
R. Sood
P. Kinnunen


Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 12 weeks


Abstract | Full Text

A series of novel symmetrical and asymmetrical squarylium dyes with the different substituents in the donor moieties have been tested for their ability to detect and characterize insulin and lysozyme amyloid fibrils prepared in acidic buffer at elevated temperature. The dye-protein binding parameters were estimated in terms of the one-site Langmuir adsorption model using the data of direct and reverse fluorimetric titrations. By comparing the dye quantum yields, binding affinities, and extents of the fluorescence enhancement in the protein-bound state, G6 and G7 were selected as the most prospective amyloid tracers. Furthermore, these probes provided evidence for the lower polarity of the lysozyme fibrillar grooves compared to insulin aggregates. The novel dyes G6 and G7 were recommended for amyloid fibril detection and characterization in the near-infrared region.