o:1557 Uticaj Mg(II) i Ca(II) jona na autooksidaciju orto-dihidroksi fenolnih jedinjenja u vodenim rastvorima The influence of Mg(II) and Ca(II) ions on the otho-dihydroxy phenolic compounds autoxidation in aqueous solutions : doctoral dissertation sr In this dissertation, the influence of diamagnetic metal ions Mg (II) and Ca (II) on the autoxidation of polyphenol compounds, containing one or two ortho-dihydroxyl groups, in aqueous solutions at different pH values, was studied. The autoxidation of polyphenols distributed in nature, such as: catechol, caffeic acid, rosmarinic acid, chlorogenic acid, rutin and hematoxylin was investigated. For this purpose, the following instrumental methods were applied: UV/Vis spectrophotometry with subsequent hemometric treatment of UV/Vis spectra, ESR spectroscopy, high performance liquid chromatography (HPLC) and mass spectrometry (MS). It has been shown that the pH value of the solution and/or the presence and type of metal ions affect the speed and manner of the autoxidation processes of the investigated compounds. Applied techniques have enabled the determination of the number and structure of intermediate products as well as stable autoxidation products. The obtained results allow a more detailed insight into mechanisms of antioxidative activities of studied polyphenols and a more comprehensive view of their biochemical behavior with the implications for further human use. Bibliografija: listovi 157-168. Datum odbrane: 07.12.2018. Inorganic chemistry 1025756393 91552101 6644 91552100 1025756393 2019-03-15T10:46:14.053Z 45 no 46 mentor Slavoljub C. 1963- Živanović 2018 63 mentor Goran Nikolić 2018 63 član komisije Danijela 1969- Kostić 2018 63 član komisije Žarko 1975- Mitić 2018 63 član komisije Nenad 1984- Krstić 2018 176 listova 4491575 http://phaidrabg.bg.ac.rs/o:1557 no yes 4 2019-03-15T10:46:14.320Z 70 autooksidacija, katehol, kafena kiselina, rutin, ruzmarinska kiselina, hematoksilin, hlorogenska kiselina, magnezijum, kalcijum autooxidation, catechol, caffeic acid, rutin, rosmarinic acid, hematoxylin, chlorogenic acid, magnesium, calcium 546.4:[542.943:547.565.2(043.3) P 360 1738 18A07 18A0703 2018