Electron spin resonance measurement of radical scavenging activity of Aronia melanocarpa fruit juice

Stefka Valcheva-Kuzmanova; Branka Blagovic; Srecko Valic

Articles

Abstract

Pharmacognosy Magazine,2012,8,30,171-174.

DOI:10.4103/0973-1296.96583

Published:May 2012

Type:Original Article

Authors:

Author(s) affiliations:

Stefka Valcheva-Kuzmanova¹, Branka Blagovic², Srecko Valic³
¹Department of Preclinical and Clinical Pharmacology and Toxicology, Medical University, 9002 Varna, Bulgaria
²Department of Chemistry and Biochemistry, School of Medicine, University of Rijeka, Croatia (Hrvatska)
³Department of Chemistry and Biochemistry, School of Medicine, University of Rijeka; Rudjer Boškovic Institute, Bijenicka c. 54, 10000 Zagreb, Croatia (Hrvatska)

Abstract:

Background: The fruits of Aronia melanocarpa (Michx.) Elliot contain large amounts of phenolic substances, mainly procyanidins, anthocyanins and other flavonoids, and phenolic acids. The ability of phenolic substances to act as antioxidants has been well established. Objective: In this study, we investigated the radical scavenging activity of A. melanocarpa fruit juice (AMFJ). Materials and Methods: The method used was electron spin resonance (ESR) spectroscopy. The galvinoxyl free radical was used as a scavenging object. AMFJ was added to the galvinoxyl free radical solution. The measure of the radical scavenging activity was the decrease of signal intensity. Results: AMFJ showed a potent antiradical activity causing a strong and rapid decrease of signal intensity as a function of time and juice concentration. This effect of AMFJ was probably due to the activity of its phenolic constituents. Conclusion: The ESR measurements in this study showed a pronounced radical scavenging effect of AMFJ, an important mechanism of its antioxidant activity.