Academic Journal
The oxidative decomposition of natural bioactive compound rhamnetin
| العنوان: | The oxidative decomposition of natural bioactive compound rhamnetin |
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| المؤلفون: | Ramešová, Š. (Šárka), Degano, I., Sokolová, R. (Romana) |
| سنة النشر: | 2017 |
| المجموعة: | The Czech Academy of Sciences: Publication Activity (ASEP) / Akademie věd ČR - Publikační činnost |
| مصطلحات موضوعية: | oxidation, flavonoids, cyclic voltammetry |
| الوصف: | The oxidation of the natural bioflavonoid rhamnetin was studied by a multi-analytical approach. It was widely used as a dye for colouring tapestries, and it is known for degrading in the presence of atmospheric oxygen and light. The oxidation mechanism was studied by cyclic voltammetry and UV–Vis spectroelectrochemical methods in aqueous solution on glassy carbon and platinum electrodes. Two-electron and two-proton oxidation proceeds in acidic solution, while two-electron and one-proton oxidation was found for a dissociated molecule of rhamnetin, and one electron oxidative process was obtained for the dianion present in alkaline solution. The complicated oxidation mechanism involves not only electron transfer, but also several coupled chemical reactions. The products were identified by HPLC-DAD and HPLC-ESI-MS/MS techniques. The distribution of oxidation products was strongly dependent on the duration of exposure to atmospheric oxygen. The main oxidation product was identified as 2-[(3,4-dihydroxyphenyl)carbonyl]-2,4-dihydroxy-6-methoxy-1-benzofuran-3(2H)-one. Because rhamnetin in solution was fully degraded by oxygen in 6 min, it was necessary to prepare its solutions under argon atmosphere prior any electrochemical measurement. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 1572-6657 1873-2569 |
| Relation: | urn:pissn: 1572-6657; urn:eissn: 1873-2569; http://hdl.handle.net/11104/0268683 |
| DOI: | 10.1016/j.jelechem.2017.01.054 |
| الاتاحة: | https://doi.org/10.1016/j.jelechem.2017.01.054 http://hdl.handle.net/11104/0268683 |
| Rights: | info:eu-repo/semantics/restrictedAccess |
| رقم الانضمام: | edsbas.4D37BB1E |
| قاعدة البيانات: | BASE |
| تدمد: | 15726657 18732569 |
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| DOI: | 10.1016/j.jelechem.2017.01.054 |