3 years ago

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

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

Publisher URL: www.sciencedirect.com/science

DOI: S0039914017306239

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