TY  - JOUR
AU  - Momić, Tatjana
AU  - Savić, Jasmina
AU  - Černigoj, Urh
AU  - Trebše, Polonca
AU  - Vasić, Vesna M.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3355
AB  - Studies of protolytic equilibria and investigations of stability of flavonoids at different acidities are necessary to better understand their antioxidant efficiencies and autoxidation characteristics. The protonation constant of carbonyl group and dissociation constants of OH groups of quercetin in aqueous solutions were determined spectrophotometrically. The distribution diagram of ionic species in aqueous solutions of various acidities was calculated. Study of the effects of UV irradiation on quercetin at pH 5.00, 7.50 and 10.00 indicated that UV irradiation accelerated quercetin autoxidation via the formation of the oxidation product. The stability of quercetin and oxidation product was investigated as a function of irradiation time by using spectrophotometric and HPLC techniques. The apparent pseudo-first-order rate constants for quercetin degradation and oxidation product formation were calculated and discussed.
T2  - Collection of Czechoslovak Chemical Communications
T1  - Protolytic equilibria and photodegradation of quercetin in aqueous solution
VL  - 72
IS  - 11
SP  - 1447
EP  - 1460
DO  - 10.1135/cccc20071447
ER  - 

@article{
author = "Momić, Tatjana and Savić, Jasmina and Černigoj, Urh and Trebše, Polonca and Vasić, Vesna M.",
year = "2007",
abstract = "Studies of protolytic equilibria and investigations of stability of flavonoids at different acidities are necessary to better understand their antioxidant efficiencies and autoxidation characteristics. The protonation constant of carbonyl group and dissociation constants of OH groups of quercetin in aqueous solutions were determined spectrophotometrically. The distribution diagram of ionic species in aqueous solutions of various acidities was calculated. Study of the effects of UV irradiation on quercetin at pH 5.00, 7.50 and 10.00 indicated that UV irradiation accelerated quercetin autoxidation via the formation of the oxidation product. The stability of quercetin and oxidation product was investigated as a function of irradiation time by using spectrophotometric and HPLC techniques. The apparent pseudo-first-order rate constants for quercetin degradation and oxidation product formation were calculated and discussed.",
journal = "Collection of Czechoslovak Chemical Communications",
title = "Protolytic equilibria and photodegradation of quercetin in aqueous solution",
volume = "72",
number = "11",
pages = "1447-1460",
doi = "10.1135/cccc20071447"
}

Momić, T., Savić, J., Černigoj, U., Trebše, P.,& Vasić, V. M.. (2007). Protolytic equilibria and photodegradation of quercetin in aqueous solution. in Collection of Czechoslovak Chemical Communications, 72(11), 1447-1460.
https://doi.org/10.1135/cccc20071447

Momić T, Savić J, Černigoj U, Trebše P, Vasić VM. Protolytic equilibria and photodegradation of quercetin in aqueous solution. in Collection of Czechoslovak Chemical Communications. 2007;72(11):1447-1460.
doi:10.1135/cccc20071447 .

Momić, Tatjana, Savić, Jasmina, Černigoj, Urh, Trebše, Polonca, Vasić, Vesna M., "Protolytic equilibria and photodegradation of quercetin in aqueous solution" in Collection of Czechoslovak Chemical Communications, 72, no. 11 (2007):1447-1460,
https://doi.org/10.1135/cccc20071447 . .