Radical Scavenging Activity of Selected Medicinal Plants From Limpopo Province of South Africa

Plants collected from Limpopo province of South Africa were investigated for their antioxidative potential using the DPPH radical scavenging assay. Acetone extracts of Flueggea virosa had the highest antioxidant activity with an IC₅₀ value of 30 µg/ml, closely matching the ascorbic acid with an IC₅₀ value of 25 µg/ml. The lowest antioxidant readings were observed with extracts of Rhynchosia venulosa (root extract) and Ficus ingens (leaf extract). Acetone extract of Bridelia virosa leaves had the highest phenolic content (156 mg GAE/g extract), while the lowest content was recorded for R. venulosa root extract and leaf extract of F. ingens (8.3 and 17.7 mg GAE/g extract, respectively). There was a linear correlation between antioxidant activity and total phenolic content. Extracts with high phenolic content had low IC₅₀ values, while extracts with low phenolic concentrations had high IC₅₀ values.     

仙鹤草根芽中新二氢黄酮醇甙的结构研究

从仙鹤草根芽的苯提取物和丙酮提取物中分得三个化合物。通过理化性质,波谱数据(UV,IR,NMR,MS,GD,GC),化学降解和衍生物制备,两个已知化合物分别鉴定为软脂酸(Ⅷ)和胡萝卜甙(Ⅸ),一个新化合物确定为(2S,3S)-(一)-花旗松素-3-O-β-D-葡萄吡喃糖甙(Ⅹ)。