Spectrophotometric investigation of the complexing reaction between rutin and titanyloxalate anion in 50% ethanol
Само за регистроване кориснике
2000
Чланак у часопису (Објављена верзија)
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In the present work, rutin (3,3',4',5,7-pentahydrohyflavone-3-rhamnoglucoside) was determinated via a complexing reaction with a titanyloxalate anion. K-2[TiO(C2O4)(2)] and rutin react in 50% ethanol forming a 1:2 complex in a pH range from 4.00 to 11.50, in which the TiO(C2O4)(2)(2-) ion is linked to rutin through the 4-carbonyl and 5-hydroxyl group. The thermodynamic stability constant log beta(2)(0) of the complex is determined to 10.80 at pH = 6.50. The change of the standard Gibbs free energy Delta G(0) amounts to -61 kJ . mol(-1), indicating that the process of complex formation is spontaneous. The optimal conditions for the spectrophotometric determination of microconcentrations of rutin are at pH = 6.40 and lambda = 430 nm, where the complex shows an absorption maximum with a molar absorption coefficient a(430) = (60+/-2) . 10(3) dm(3) . mol(-1) . cm(-1). The method is applied rutin determination from tablets.
Извор:
Monatshefte für Chemie Chemical Monthly, 2000, 131, 7, 769-777Издавач:
- Springer-Verlag Wien, Vienna
DOI: 10.1007/s007060050024
ISSN: 0026-9247
WoS: 000088565300009
Scopus: 2-s2.0-0008626740
Институција/група
PharmacyTY - JOUR AU - Kuntić, Vesna AU - Malešev, Dušan AU - Radović, Z AU - Vukojević, Vladana PY - 2000 UR - https://farfar.pharmacy.bg.ac.rs/handle/123456789/233 AB - In the present work, rutin (3,3',4',5,7-pentahydrohyflavone-3-rhamnoglucoside) was determinated via a complexing reaction with a titanyloxalate anion. K-2[TiO(C2O4)(2)] and rutin react in 50% ethanol forming a 1:2 complex in a pH range from 4.00 to 11.50, in which the TiO(C2O4)(2)(2-) ion is linked to rutin through the 4-carbonyl and 5-hydroxyl group. The thermodynamic stability constant log beta(2)(0) of the complex is determined to 10.80 at pH = 6.50. The change of the standard Gibbs free energy Delta G(0) amounts to -61 kJ . mol(-1), indicating that the process of complex formation is spontaneous. The optimal conditions for the spectrophotometric determination of microconcentrations of rutin are at pH = 6.40 and lambda = 430 nm, where the complex shows an absorption maximum with a molar absorption coefficient a(430) = (60+/-2) . 10(3) dm(3) . mol(-1) . cm(-1). The method is applied rutin determination from tablets. PB - Springer-Verlag Wien, Vienna T2 - Monatshefte für Chemie Chemical Monthly T1 - Spectrophotometric investigation of the complexing reaction between rutin and titanyloxalate anion in 50% ethanol VL - 131 IS - 7 SP - 769 EP - 777 DO - 10.1007/s007060050024 ER -
@article{ author = "Kuntić, Vesna and Malešev, Dušan and Radović, Z and Vukojević, Vladana", year = "2000", abstract = "In the present work, rutin (3,3',4',5,7-pentahydrohyflavone-3-rhamnoglucoside) was determinated via a complexing reaction with a titanyloxalate anion. K-2[TiO(C2O4)(2)] and rutin react in 50% ethanol forming a 1:2 complex in a pH range from 4.00 to 11.50, in which the TiO(C2O4)(2)(2-) ion is linked to rutin through the 4-carbonyl and 5-hydroxyl group. The thermodynamic stability constant log beta(2)(0) of the complex is determined to 10.80 at pH = 6.50. The change of the standard Gibbs free energy Delta G(0) amounts to -61 kJ . mol(-1), indicating that the process of complex formation is spontaneous. The optimal conditions for the spectrophotometric determination of microconcentrations of rutin are at pH = 6.40 and lambda = 430 nm, where the complex shows an absorption maximum with a molar absorption coefficient a(430) = (60+/-2) . 10(3) dm(3) . mol(-1) . cm(-1). The method is applied rutin determination from tablets.", publisher = "Springer-Verlag Wien, Vienna", journal = "Monatshefte für Chemie Chemical Monthly", title = "Spectrophotometric investigation of the complexing reaction between rutin and titanyloxalate anion in 50% ethanol", volume = "131", number = "7", pages = "769-777", doi = "10.1007/s007060050024" }
Kuntić, V., Malešev, D., Radović, Z.,& Vukojević, V.. (2000). Spectrophotometric investigation of the complexing reaction between rutin and titanyloxalate anion in 50% ethanol. in Monatshefte für Chemie Chemical Monthly Springer-Verlag Wien, Vienna., 131(7), 769-777. https://doi.org/10.1007/s007060050024
Kuntić V, Malešev D, Radović Z, Vukojević V. Spectrophotometric investigation of the complexing reaction between rutin and titanyloxalate anion in 50% ethanol. in Monatshefte für Chemie Chemical Monthly. 2000;131(7):769-777. doi:10.1007/s007060050024 .
Kuntić, Vesna, Malešev, Dušan, Radović, Z, Vukojević, Vladana, "Spectrophotometric investigation of the complexing reaction between rutin and titanyloxalate anion in 50% ethanol" in Monatshefte für Chemie Chemical Monthly, 131, no. 7 (2000):769-777, https://doi.org/10.1007/s007060050024 . .