Abstract
The electrochemical and analytical characteristics of enantioselective sensors based on glassy carbon electrodes modified by chelate complexes (bis(L-phenylalaninate) copper(II), glycinato-L-phenylalaninate copper(II), tris(L-phenylalaninate) cobalt(II), bis(L-phenylalaninate) zinc) are studied. It is found that the most promising sensor for determining tryptophan enantiomers is the sensor modified by copper(II) (bis)L-phenylalaninate. In determining tryptophan enantiomers, this sensor provides a linear concentration range from 6.25 × 10–7 to 0.5 × 10–3 M for L-tryptophan and from 5 × 10–6 to 0.5 × 10–3 M for D-tryptophan. The sensor is more sensitive to L-tryptophan. The proposed sensor was used for the recognition and determination of tryptophan enantiomers in human urine and plasma samples, and also in a mixture of enantiomers. The statistical assessment of the results of determinations by the spiked–found method indicates the absence of a significant systematic error.
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This work was supported by the Russian Science Foundation, project no. 21-13-00169, https://rscf.ru/project/21-13-00169/.
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Translated by V. Kudrinskaya
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Zil’berg, R.A., Zagitova, L.R., Vakulin, I.V. et al. Enantioselective Voltammetric Sensors Based on Amino Acid Complexes of Cu(II), Co(III), and Zn(II). J Anal Chem 76, 1438–1448 (2021). https://doi.org/10.1134/S1061934821120145
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DOI: https://doi.org/10.1134/S1061934821120145