作者:Runsheng Xu、Jing Zhang、Ke Yuan
DOI:10.3390/molecules15096357
日期:——
Two new flavones, 8,3′-dihydroxy-3,7,4′-trimethoxy-6-O-β-D-glucopyranosyl flavone (1) and 6,8,3′-trihydroxy-3,7,4′-trimethoxyflavone (2) were isolated from Tridax procumbens Linn., together with the four known compounds puerarin (3), esculetin (4), oleanolic acid (5) and betulinic acid (6). The structures of the two new flavones were elucidated based on chemical analysis and spectral methods (IR, 1D and 2D NMR, ESI-MS, HR-ESI-MS). The antioxidant activity of the two new flavones were evaluated by two methods, the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity and ferric reducing antioxidant power (FRAP) assays, and the data showed that compounds 1 and 2 have certain antioxidant activity, with the antioxidant activity of compound 2 being stronger than that of compound 1.
从Tridax procumbens Linn.中分离出两种新的黄酮,8,3′-二羟基-3,7,4′-三甲氧基-6-O-β-D-吡喃葡萄糖基黄酮(1)和6,8,3′-三羟基-3,7,4′-三甲氧基黄酮(2)、和四种已知化合物葛根素(3)、鱼藤素(4)、齐墩果酸(5)和白桦脂酸(6)。根据化学分析和光谱方法(红外光谱、1D 和 2D NMR、ESI-MS、HR-ESI-MS)阐明了这两种新黄酮的结构。通过 1,1-二苯基-2-苦基肼(DPPH)自由基清除活性和铁还原抗氧化能力(FRAP)测定两种方法对两种新黄酮的抗氧化活性进行了评价,数据显示化合物 1 和 2 具有一定的抗氧化活性,其中化合物 2 的抗氧化活性强于化合物 1。