Optoacoustic determination of analytical parameters and physicochemical constants in highly concentrated solutions of chromophores

Publication date: 1 November 2017
Source:Talanta, Volume 174
Author(s): Kristina V. Lobko, Mikhail A. Shishkin, Tatyana A. Filimonova, Dmitry S. Volkov, Ivan M. Pelivanov, Mikhail A. Proskurnin
Determination of chromophores of various classes—rosaniline (fuchsine), cyanidin-3-O-glucoside, tris(1,10-phenanthroline) iron(II), and phenol red — in their concentrated solutions near their solubility limits is performed with the optoacoustic technique for optically dense solutions; light-absorption coefficients of samples range from 0.5 to 500cm^–1. The assessment of these substances in organo-aqueous and organic solvents is possible up to ca. 0.1molL^–1. Characteristic stability and rate constants of the chelation of iron(II) with 1,10-phenanthroline are determined. It was found that turbidities up to 200 FTU and dynamic viscosities up to 20mPas do not affect the determination. The determination of total anthocyanins (as cyanidin-3-O-glucoside) in bilberry and sweet-cherry juices agrees with the reference spectrophotometric method and demonstrates the possibilities of the optoacoustic technique for the analysis of real samples without dilution and with almost no sample preparation.

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