Abstract
Kinetics of ortho-phenylenediamine (PDA) oxidation has been investigated in the “pseudoperoxidase” system, Methemalbumin-H2O2, in the presence of 2-amino-4-tert-butylphenol (ATBP), 2-amino-4,6-ditert-butylphenol (ADTBP) and its four N-acyl derivates, as well as flavonoids (quercetin, morin, silibin, hesperidin and naringin). Under standard experimental conditions (20°C, phosphate buffered saline, pH 7.4, containing 5.25% ethanol and DMF) ATBP, ADTBP and two its N-acyl-derivatives and also all five flavonoids inhibited PDA oxidation with different efficiency, which was characterized in terms of the inhibition constants, Ki, M, or the percent of inhibition degree at the maximal concentrations of these inhibitors. Quercetin (Ki = 7.7 × 10−5 M) and ATBP (Ki = 1.26 × 10−4 M) were the most effective antioxidants. Using these characteristics and other required criteria, the pairs PDA-quercetin and PDA-ATBP were proposed for a practical application in the test-systems for evaluation of total antioxidant activity of biological objects.
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Abbreviations
- ABTS:
-
2,2′-azino-bis(3-ethyl-2,3-dihydrobenz-thiazoline-6-sulfonate) diammonium salt
- ADTBP:
-
2-amino-4,6-ditert-butylphenol
- AOA:
-
antioxidant activity
- ATBP:
-
2-amino-4-tert-butylphenol
- MetHa:
-
methemalbumin (hemin complex with BSA at the ratio 1: 3)
- DMF:
-
dimethylformamide
- PDA:
-
orthophenylenediamine
- InH:
-
inhibitors of free radical processes
- TMB:
-
3,3′,5,5′-tetramethylbenzidine
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Original Russian Text © Yu.A. Grigorenko, E.I. Karaseva, D.I. Metelitza, V.L. Sorokin, G.A. Ksendsova, O.I. Shadyro, 2008, published in Biomeditsinskaya Khimiya.
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Grigorenko, Y.A., Karaseva, E.I., Metelitza, D.I. et al. Substituted aminophenols and flavonoids as potential components for test-systems for total antioxidant activity. Biochem. Moscow Suppl. Ser. B 2, 75–81 (2008). https://doi.org/10.1007/s11828-008-1008-x
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DOI: https://doi.org/10.1007/s11828-008-1008-x