Antioxidant Activity Of Some Phanerogam Plant Extracts

摘要

Nine phanerogam plants (common lady's-mantle, bear's garlic, common sweet flag, agrimony, gold-enrod, common speedwell, european mistletoe, horsetail and milfoil) were evaluated regarding their total flavonoid contents and antioxidant activity. The flavonoid contents ranged from 0.72 (goldenrod) to 0.25 mmol/g dry matter (horsetail). The contents of quercetin, rutin, kaempferol and myricetin were quantified by high performance liquid chromatography. Quercetin content was found to be very low in golden-rod and mistletoe extracts (0.20 μmol/g dry matter in european mistletoe) and almost undetectable in the other seven extracts. The rutin content was much higher, ranging from 96.25 (goldenrod) to 0.49 μmol/g dry matter (common sweet flag). Except for horsetail, kaempferol was found in all other eight extracts, the biggest quantity (2.15 μmol/g dry matter) being in the goldenrod extract. Myricetin was only found in goldenrod and agrimony (0.35 and 0.08 μmol/g dry matter respectively). Goldenrod and milfoil showed the highest values for the antioxidant activity, expressed as mol quercetin equivalent, in the DPPH·(1,1-diphenyl-2-picrylhydrazyl) method, namely 0.00542 and 0.00532. These results suggest them to be used as natural sources of antioxidants instead of synthetic ones.