Analysis of Phenylethanoid Glycosides and Flavonoid Glycosides from Scutellaria galericulata

Objective:To investigate the chemical constituents of Scutellaria galericulata.Method: The herb of S.galericulata was crushed and then extracted with 95% ethanol.The extracts were combined and concentrated under reduced pressure.The extracts were dispersed in water and respectively extracted with petroleum ether, ethyl acetate, chloroform and n-butanol to get petroleum ether fraction, ethyl acetate fraction, chloroform fraction and n-butanolfraction.Ethyl acetate fraction were separated and purified by silica gel column chromatography, Sephadex LH-20 and HPTLC.The structures of the glycosides compounds were identified by their physico-chemical properties and spectral data.Result: Eleven compounds were isolated and purified as: isocrenatoside (1),osmanthuside B_6 (2), eutigoide A (3), plantainoside C (4), calceorioside B (5), isomartynoside (6), verbascoside (7), acteoside (8), desrhamnosyl acteoside (9), 5,7-dihydroxy-8,2'-dimethoxyflavone-7-O-beta-D-glucopyranoside (10), and apigenin-7-O-rhamnoside (11).Conclusion: Compounds 1-4 and 7-11 were isolated from S.galericulata for the first time, and the literature review showed that plantainoside C, apigenin-7-O-rhamnoside and other compounds had anti-inflammatory and antioxidant activities, providing a good reference for further studies onpharmacodynamic material basis and the development and utilization of S.galericulata

ELectro-oxidation of Glyoxal to Glyoxalic Acid

本文介绍了一种用电化学法合成乙醛酸的新方法 ,采用以DSA作阳极材料的离子交换膜电解槽和周期性间歇操作方式 ,研究了乙二醛和盐酸混合体系中各种工艺条件对电流效率(CEa)和乙醛酸收率 (RSa)的影响 ,得最佳电解条件 :反应温度 30～ 40℃ ,电解液流速 1.4m/s,电极电流密度 45 0A/m2 ,乙二醛初始浓度 (wt%以下同 ) 9.1%～ 16 .0 % ,盐酸初始浓度 4%～ 6 % ,在此条件下电解乙二醛 ,乙醛酸收率 91.1% ,电流效率 80 .0 % .An investigation has been made to obtain the glyoxalic acid by the electrochemical oxidation of glyoxal solution with hydrochloric acid under various experimental conditions.The cell used consists of a lead cathode, a DSA anode and a cation_exchange membrane of model CM001.The current efficiency and yield for glyoxalic acid generation were 80.0% and 91.1% respectively, under optimal operating conditions: velocity of electrolyte flow 1.4 m·s -1 ,current density 450A·m -2 ,temperature 30～40 ℃,initial concentration of glyoxal and hydrochloric acid 9.1%～16.0%, 4%～6%, respectively.作者联系地址：华东理工大学联合化学反应工程研究所!反应工程国家重点实验室上海200237,华东理工大学联合化学反应工程研究所!反应工程国家重点实验室上海200237,华东理工大学联合化学反应工程研究所!反应工程国家重点实验室上海200237,华东理工大学联合化学反应工程研究所!反应工程国家重点Author's Address: UNILAB Research Center of Chemical Reaction Eenginering, East China University of Science and Technology, State Key lab.for Reaction Engineering,Shanghai,200237,China$$

掺杂InGaAs/InAlAs单量子阱中电子对称态和反对称态磁输运研究

利用变温Hall测量研究了重掺杂InGaAs/InAlAs单量子阱中二维电子气,发现在量子阱中由于存在电子对称态和反对称态导致纵向电阻出现拍频现象.通过分析拍频节点位置,得到电子对称态和反对称态之间的能级间距为4meV.此外,通过迁移率谱方法和多载流子拟合过程研究了不同迁移率电子的浓度和迁移率随温度的变化关系