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
