向日葵花盘中色烯类成分研究及其不同部位中含量测定

目的研究向日葵中色烯类成分并测定其不同部位中的含量。方法向日葵老花盘乙酸乙酯提取物采用HPLC进行分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。向日葵不同部位甲醇提取物的分析采用Feinigen Red Classical C_(18)色谱柱(4.6 mm×250 mm,5μm);流动相甲醇-水;体积流量1 mL/min;检测波长257 nm;柱温25℃。结果从中分离得到5个化合物,分别鉴定为6-羟基乙酰基-2,2-二甲基色烯(1)、7-羟基-6-羟基乙酰基-2,2-二甲基色烯(2)、5-乙酰基-2-(丙-2-甲叉基)苯并呋喃-3-酮(3)、6-乙酰基-2,2-二甲基色烯(4)、6-乙酰基-7-羟基-2,3-二甲基色烯(5)。化合物3在向日葵不同部位的含量大小依次为老花盘、茎、叶,在嫩花盘、根和茎髓中检测不到化合物3;化合物4在向日葵不同部位的含量大小依次为老花盘、茎、根、嫩花盘、叶,在茎髓中检测不到化合物4。结论所有化合物均为首次从该植物中分离得到,其中化合物3为首次从天然产物中分离得到。化合物3~4在向日葵的老花盘中含量最高。

Large-scale preparation of fernwort-like single-crystalline superstructures of CuSe as Fenton-like catalysts for dye decolorization

A simple green hydrothermal template-free method was developed to prepare single-crystalline superstructures of fern- wort-like copper selenide （CuSe） in large-scale by using polyvinylpyrrolidone （PVP） as both reductant and surfactant for the first time. Time-dependent morphologic evolution was made in order to explore the formation mechanism of the as-prepared product. The copper selenides with different morphologies, phases and structural forms could be prepared by varying the synthesis parameters, such as precursor molar ratios, precursor combinations, and the molecular weight of PVP. The fernwort-like superstructures of CuSe show excellent Fenton-like catalytic activities in degrading malachite green （MG） and rhodamine B （RhB）. These catalysts play an important role in the degradation process of MG and RhB solution with the aid of H202 which can yield highly reactive hydroxyl radicals （HO.）. Besides, the as-prepared CuSe catalyst is stable and reusable, thus it could be applied to the treatment of the dye contaminated waste water.