蝉翼藤抗氧化酮成分研究

目的：研究蝉翼藤抗氧化活性成分。方法：采用活性跟踪，利用各种色谱法分离，运用多种波谱技术(1D-NMR,2D-NMR和MS)鉴定结构。结果：从具有抗氧化活性的蝉翼藤根95%乙醇提取物的氯仿部位得到9个酮类化合物：1,2,5-三羟基-6,8-二甲氧基-酮(1), 1,5-二羟基-2,6,8-甲氧基-酮(2), 3,8-二羟基-1,4-二甲氧基-酮(3), 4,6-二羟基-1,5,7-三甲氧基-酮(4), 7-羟基-1,2,3,8-四甲氧基-酮(5), 1,7-二羟基-酮(6), 4-羟基-3,7-二甲氧基-酮(7), 1,7-二甲氧基-酮(8)和aucuparin(9)。结论：化合物1，2为新化合物,化合物3为新天然产物,化合物4，6为首次从该属中获得；化合物9在ABTS和FRAP模型中显示出显著的抗氧化活性；化合物1清除DPPH自由基能力的IC₅₀为0.31 mg·L^-1。ABTS和FRAP两个模型显示较高相关性(r=0.955 5)。

Antioxidant xanthones from Securidaca inappendiculata

Objective: To study the antioxidant constituents from the roots of Securidaca inappendiculata. Method: The bioassay-guided isolation of antioxidant constituents was carried out by the column chromatographic techniques. The combination of IR, MS, NMR and 2D-NMR spectroscopics methods was used to identify their structures. Result: Two new xanthones, 1, 2, 5-trihydroxy-6, 8-dimethoxy-9H-xanthen-9-one(1), 1, 5-dihydroxy-2, 6, 8-trimethoxy-9H-xanthen-9-one(2), along with seven known ones, 3, 8-dihydroxy-1, 4-dimethoxy-9H-xanthen-9-one(3), 4, 6-dihydroxy-1, 5, 7-trimethoxy-9H-xanthen-9-one(4), 7-hydroxy-1, 2, 3, 8-tetramethoxy-9H-xanthen- 9-one(5), 1, 7-dihydroxy-9H-xanthen-9-one(6), 4-hydroxy-3, 7-dimethoxy-9H-xanthen-9-one(7), 1, 7-dimethoxy-9H-xanthen-9-one(8) and aucuparin(9), were isolated from the roots of S. inappendiculata. Conclusion: Compounds 1 and 2 were new xanthones, and compound 3 was isolated as a natural product for the first time, and compounds 4 and 6 were isolated for the first time from this genus. The antioxidant activities of all compounds were evaluated by ABTS,FRAP and DPPH assays respectively. Compound 9 showed significant activity by the ABTS and FRAP assays. Compound 1 showed significant activity with IC₅₀ value of 0.31 mg·L^-1 in DPPH assay. Scavenging capacity of all compounds determined by all assays were well correlated between ABTS and FRAP assay(r=0.955 5).