Free radical scavenging activity for infusions of 30 medicinal plants detected with Electron Paramagnetic Resonance
DPPH radical scavenging activity for thirty medicinal plant infusions was investigated with a use of Electron Paramagnetic Resonance. Infusions were prepared in similar way in which herbs or herbal teas are prepared directly for human consumption. Samples were obtained mostly from popular and easy available medicinal plants, used as single herbs or in herbal mixtures. The total flavonoid content for fifteen selected plants was measured using modified Christ-Müller method. The best DPPH radical scavenging activity (more than 50% of DPPH radical reduced in examined sample after 1 h) was obtained for Melissae folium (87%), Sambuci flos (81%), Ulmariae flos (79%), Hyperici herba (67%) and Arnicae anthodium (66%). Green tea confirmed to be strong DPPH scavenger among examined plants (65%). The highest flavonoid amounts were discovered for Ulmariae flos (1.5%), Hyperici herba (1.2%), Betulae folium (0.9%). There was no correlation between DPPH scavenging activity and the total content of flavonoids in examined plan material.