o:879 Uticaj dijamagnetnih dvovalentnih jona metala na autooksidaciju vicinalnih trihidroksilnih fenolnih jedinjenja u vodenim rastvorima : doktorska disertacija sr In this dissertation the influence of divalent diamagnetic metal ions (Mg(II), Ca(II), Sr(II), Ba(II), Zn(II), Cd(II) and Pb(II)) on vicinal trihydroxy phenolic compounds autoxidation in aqueous solutions was examined. Autoxidation processes of pyrogallol (the simplest compound with appropriate structure), gallic acid and ethyl gallate were studied with the application of UV/Vis spectrophotometry with chemometric data processing, EPR spectroscopy, High-performance liquid chromatography (HPLC) and Mass spectrometry (ESI-MS). It was determined that pH value of solution and presence and type of diamagentic metal ions have great influence on investigated compounds autoxidation processes rates and mechanism. With the aid of applied techniques the structures of transition free radical species and stable autoxidation processes products were determined. Obtained results enabled better understanding of investigated compounds autoxidation processes which is of great importance since gallic acid is found in many plants, while ethyl gallate is used as an antioxidant in food. Umnoženo za odbranu. Univerzitet u Nišu, Prirodno-matematički fakultet, Departman za hemiju, 2014. Bibliografija: listovi 166-168. Summary. 1024720873 91552101 1338 91552100 1024720873 2014-10-20T11:13:24.053Z 45 no 46 mentor Aleksandar M., 1978- Veselinović 2014 63 mentor Goran M. 1966- Nikolić 2014 63 član komisije Ružica, 1951- Nikolić 2014 63 član komisije Danijela, 1969- Kostić 2014 63 član komisije Vesna. 1965- Nikolić 2014 63 član komisije Jelena. 1971- Živković 2014 PDF/A (183 lista) 18919327 http://phaidrabg.bg.ac.rs/o:879 no yes 4 2014-10-20T11:13:24.320Z 70 Vodeni rastvori, pirogalol, galna kiselina, etil-galat autoxidation, pyrogallol, gallic acid, ethyl-gallate,diamagnetic metal ions 54 1738 18A07 18A0703 2014