Comparison of antioxidant properties of infusions from different parts of Arnica montana and Arnica chamissonis var. foliosa Less.
Arnica chamissonis (AC) was a good source of total phenolics, phenolic acids and flavonoids. Irrespective of raw material the highest reducing powers were observed in AC infusions, whereas the highest chelating power (about 100%) was stated in the rhizomes of AC. Free radicals were the most effectively scavenged by extracts of AC flower heads and herb (about 60% – SASA and 90% – ABTS , respectively). Lipid peroxidation was strongly inhibited by flower heads infusion of both Arnica genera and herb infusions of Arnica montana (AM) – about 100%. Positive correlations between ABTS +. and O2 - radical scavenging properties, reducing power and total phenolics content (r=0.97, r=0.79, r=0.83, and r=0.50, respectively), flavonoids content (r=0.92, r=0.77, r=0.66, and r=0.51, respectively) and phenolic acids content (r=0.86, r=0.94 and r=0. 75, respectively) were found. In addition, inhibition of lipid peroxidation was correlated with total phenolics and flavonoids contents (r=0.50, r=0.51, respectively). Key words: antioxidant activity, Arnica, free radicals, phenolic compounds