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


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.


CONCLUSIONS
The ESR measurements in this study showed a pronounced radical scavenging effect of AMFJ, an important mechanism of its antioxidant activity.
Department of Preclinical and Clinical Pharmacology and Toxicology, Medical University, 9002 Varna, Bulgaria.
Stefka
S
Valcheva-Kuzmanova
Branka
B
Blagović
Srećko
S
Valić