ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

DFT study of free radical scavenging activity of erodiol

Zoran Marković, Jelena Đorović, Milan Dekić, Milanka Radulović, Svetlana Marković, and Marija Ilić

Department of Chemical-Technological Sciences, State University of Novi Pazar, Vuka Karadžića bb, 36300, Novi Pazar, Serbia

E-mail: zmarkovic@np.ac.rs

Abstract: Antioxidant activity of erodiol was examined at the M05-2X/6-311+G(d,p) level of theory in the gas and aqueous phases. The structure and energy of radicals and anions of the most stable erodiol rotamer were analyzed. To estimate antioxidant potential of erodiol, different molecular properties were examined: bond dissociation enthalpy, proton affinity together with electron transfer energy, and ionization potential followed by proton dissociation enthalpy. It was found that hydrogen atom transfer is the prevailing mechanism of erodiol behavior in gas; whereas single electron transfer followed by proton transfer and sequential proton loss electron transfer mechanisms represent the thermodynamically preferred reaction paths in water.

Keywords: depside – erodiol – free radical scavenging mechanisms – BDE – IP – PA

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-013-0402-0

Chemical Papers 67 (11) 1453–1461 (2013)