Search Results

You are looking at 1 - 1 of 1 items for

  • Author: Valentina Arsić Arsenijević x
Clear All Modify Search
Open access

Snježana Mirković, Katarina Rajković, Sanja Jeremić, Marijana Gavrilović, Ljiljana Tomić, Valentina Arsić Arsenijević and Boro Krstić

Abstract

The objective of this paper was to assess the antiradical effectiveness of propolis extract (PE) based on 2.2-diphenyl-1-picrylhydrazyl radical (DPPH) bleaching assay kinetic profile. The kinetic profile of scavenging DPPH for PE exhibited one kinetic period characterized by one kinetic constant. The second-order rate constant (k 2) for the oxidation of PE by DPPH, determined for the first time in this study, was 0.17 dm3g−1s−1. The obtained k2 value was compared to that of synthetic antioxidants and natural extracts used in the food industry. Kinetic analysis of PE antiradical effectiveness showed that the k 2 was within the range values for natural colorants of fruit extracts and should be considered as a fast acting natural antioxidant source. The k 2 parameter indicates the extent of oxidation inhibition that is based on all of the kinetic profiles of DPPH bleaching rather than single point measurements. For this reason, the kinetic analysis should become a necessary step for more precise antioxidative characterization of propolis.