Analysis of volatile components in herbal pair herba schizonepetae-ramulus cinnamomi

Analysis of volatile components in herbal pair （HP） herba schizonepetae-ramulus cinnamomi （HS-RC）, single herb HS and RC was carried out by gas chromatography-mass spectrometry （GC-MS） data and chemometric resolution method （CRM）. The two-dimensional data obtained from GC-MS instruments were resolved into a pure chromatogram and a mass spectrum of each chemical compound by CRM. In total, 47, 61 and 51 chemical components in volatile oil of HS, RC, and HP HS-RC were respectively determined qualitatively and quantitatively, accounting for 90.52%, 88.37%, and 88.72% total contents of volatile oil of HS, RC, and HP HS-RC, respectively. The number of the volatile components of HP HS-RC is almost the addition of that of two single herbs, but their relative contents are changed.     

季铵盐催化合成7,7-二氯双环[4.1.0]庚烷

研究了季铵盐A-1催化二氯卡宾与环己烯的加成反应,考察了不同相转移催化剂的催化活性、反应温度、催化剂用量、反应时间对产物7,7-二氯双环[4.1.0]庚烷收率的影响.在优化反应条件(即反应温度为50C,反应时间为5 h)下,以季铵盐A-1为相转移催化剂,产率可达94.0%.实验证明,季铵盐A-1的催化活性要优于其他短碳链的季铵盐和聚乙二醇,并且在分离过程中不乳化,使产物易于分离纯化.     

苯二氧基二乙酸的制备及其酸离解常数的测定

利用苯二酚与一氯乙酸在碱性条件下的成醚反应 ,制备了三种苯二氧基二乙酸 ,通过采用本生阀密封装置和控制反应体系的 p H值 ,减少了酚羟基的氧化和一氯乙酸的水解反应 ,提高了反应的产率和选择性。用自动电位滴定仪测定了三种苯二氧基二乙酸的酸离解常数 ,在数据处理上采用了分段回归分析的方法 ,提高了精确度 ,Excel电子表格的引用使得数据的处理变得更为简便和准确。运用 CNDO/2量化计算方法对离解常数的测定结果进行了讨论。     

Chemical component analysis of volatile oil in drug pair Herba Ephedrae-Ramulus Cinnamomi by GC-MS and CRM

Active volatile components in drug pair(DP)Herba Ephedrae-Ramulus Cinnamomi(HE-RC),single drug HE and RC were analyzed by gas chromatography/mass spectrometry(GC/MS),chemometric resolution method(CRM)and overall volume integration.By means of CRM,the two-dimensional data obtained from GC-MS instruments were resolved into a pure chromatogram and a mass spectrum of each chemical compound.In total,97,62,and 78 volatile chemical components in volatile oil of HE,RC,and DP HE-RC,were respectively determined qualitatively and quantitatively,accounting for 90.08%,91.62%,and 89.76% total contents of volatile oil of HE,RC,and DP HE-RC respectively.It is further demonstrated that the numbers of volatile components of DP HE-RC are almost the sum of those of two single drugs,but some relative contents of them are changed.Some new components,such as 1,6-dimethylhepta-1,3,5-triene,tetracyclo[4.2.1.1(2,5).0(9,10)]deca-3,7-diene,globulol and(E,E)-6,10,14-trimethyl-5,9,13-pentadecatrien-2-one are found in DP HE-RC because of chemical reactions and physical changes during decoction.     

药对白术-防风及其单味药中挥发油的比较分析

采用气质联用技术(GC-MS)结合交互移动窗口因子分析法(AMWFA)解析药对白术-防风及其单味药的挥发油成分,并比较单味药与药对的共有组分数。利用质谱库结合保留时间进行定性分析,总体积积分法进行定量分析。白术、防风和药对白术-防风中分别定性了58、115、87种挥发油成分,各占其总含量的87.83%、91.96%、88.51%。白术、防风与药对白术-防风的共有组分分别为26、22种。结果表明,单味药与药对在挥发油的种类和含量上均存在较明显的差异。     

Simultaneous determination of adenine, uridine and adenosine in cordyceps sinensis and its substitutes by LC／ESI-MS

A simple, sensitive and reproducible high performance liquid chromatography-mass spectrometry coupled with electrospray ionization method for simultaneous separation and determination of adenine, adenosine and uridine was developed. The analytical column is a 2.0 mm× 150 mm Shimadzu VP-ODS column and volume fraction of the mobile phase is 86.5 %water, 12.0%methanol and 1.5%formic acid. 2-chloroadenosine was used as internal standard. Selective ion monitoring mode and selective ion monitoring ions at ratio of mass to electric charge of 136 for adenine, 268 for adenosine and 267 for uridine were chosen for quantitative analysis of the three active components. The results show that the regression equations and linear range are Y=0. 062X 0. 005 and 2.0 - 140.0μg · mL 1for adenine, Y=0. 049X 0. 004 and 4. 0 - 115.0 μg · mL-1 for uridine, Y=0. 154X 0. 014 and 1.0 - 125.0 μg · mL 1 for adenosine. The limits of detection are 0.6 μg · mL 1 for adenine, 1.0μg · mL-1 for uri dine and 0.2 μg · mL 1 for adenosine.The recoveries of the three constituents are from 96.6% to 103.2%.     

一种新型有源电力滤波器的谐波抑制应用

首先分析和比较了目前常用的有源电力滤波器的拓扑结构,并针对变电站谐波治理的特点和要求,提出了一种新型有源电力滤波器,接着分析了新型有源电力滤波器的结构特点与滤波原理,最后给出新型有源电力滤波器投入现场的效果.     

混凝投药装置伺服控制器的应用研究

针对净水工艺中如何设计良好的控制器来控制投药伺服电机的难题,从伺服控制器的精度、控制系统稳定性和可靠性等方面进行考虑,采用基于DSP的双CPU冗余结构的投药控制器,硬件设计中引入在系统可编程技术和高密度在系统可编程逻辑器件,输入输出信号进行高速的光电耦合隔离,较好地解决了各方面的问题,因而具有较高的工程应用价值.     

Synthesis and properties of rubber-steel cord adhesion promoter nickel borate acylate

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