基于微量元素分析技术的中药板蓝根和大青叶营养转运模式研究

采用电感耦合等离子体质谱(ICP-MS)和电感耦合等离子体发射光谱(ICP-OES)技术,测定不同生长时间的板蓝根和大青叶中的微量元素含量.其中,采用ICP-MS法测量Cr、Co、La、Ce、Pr、Nd、Sm、Eu、Gd、Dy、Li、Be、V、Ga、U、Nb、Zr、Bi、Th、Er、Yb、Y、Sc元素,采用ICP-OE...     

板蓝根化学成分及抗氧化活性的研究

采用高效液相色谱-串联质谱法（HPLC-MS/MS）和直接进样的电喷雾串联质谱法（ESI-MS/MS）分析板蓝根乙酸乙酯提取物、正丁醇提取物和95%乙醇提取物的化学成分。同时,采用铁离子还原能力法（FRAP）评价板蓝根的抗氧化活性,并通过自由基清除能力法（DPPH）对FRAP法的测试结果进行验证。结果表明：在板蓝根乙酸乙酯提取物、正丁醇提取物和95%乙醇提取物中共鉴别出吲哚类、喹唑酮类、有机酸类、核苷类、嘌呤类、氨基酸类、黄酮类以及糖类等28个化合物。研究发现,板蓝根抗氧化活性部位主要集中在极性较低的化学组分中,吲哚类、喹唑酮类和有机酸类化合物是其主要的有效成分。该方法简便、快捷、灵敏,可为中药化学成分分析和抗氧化活性评价提供方法参考。     

当归药材及其混伪品ITS2条形码鉴定

为了确保该药材的质量及临床安全用药,需要对常用中药当归及其混伪品进行分子鉴定。本文介绍了利用 ITS2 条形码进行鉴定的方法:对 ITS2 序列进行 PCR 扩增,并将纯化后的 PCR 产物进行双向测序,运用 CodonCode Aligner 拼接后,基于 HMMer 注释方法去掉两端的 5.8S 区和 28S 区获得 ITS2 条形码,用 MEGA5.0 软件进行相关数据分析,构建 NJ 树。结果表明:当归与其混伪品ITS2 条形码间存在明显差异,基于 ITS2 条形码构建的 NJ 树能够将当归及其混伪品区分开。因此,ITS2 条形码可有效地鉴别中药当归及其混伪品,为保证其临床用药安全提供了新的技术手段。     

超滤法处理双黄连粉针药液

本文报道了采用ＰＥＳ－Ｃ中空纤维膜处理双黄连粉针药液。结果表明经超滤法处理后双黄连药液清澈透明，有效成份基本不变，粒度符合标准。超滤膜性能稳定，采用碱液清洗方法可以使膜的性能得到恢复。     

Pharmacokinetics and tissue distribution study of praeruptorin d from radix peucedani in rats by high-performance liquid chromatography (HPLC)

Praeruptorin D (PD), a major pyranocoumarin isolated from Radix Peucedani, exhibited antitumor and anti-inflammatory activities. The aim of this study was to investigate the pharmacokinetics and tissue distribution of PD in rats following intravenous (i.v.) administration. The levels of PD in plasma and tissues were measured by a simple and sensitive reversed-phase high-performance liquid chromatography (HPLC) method. The biosamples were treated by liquid-liquid extraction (LLE) with methyl tert-butyl ether (MTBE) and osthole was used as the internal standard (IS). The chromatographic separation was accomplished on a reversed-phase C(18) column using methanol-water (75:25, v/v) as mobile phase at a flow rate of 0.8 mL/min and ultraviolet detection wave length was set at 323 nm. The results demonstrate that this method has excellent specificity, linearity, precision, accuracy and recovery. The pharmacokinetic study found that PD fitted well into a two-compartment model with a fast distribution phase and a relative slow elimination phase. Tissue distribution showed that the highest concentration was observed in the lung, followed by heart, liver and kidney. Furthermore, PD can also be detected in the brain, which indicated that PD could cross the blood-brain barrier after i.v. administration.     

赤芍活性成分微波辅助提取工艺的响应曲面法优化研究

以水为溶剂,采用微波辅助法提取赤芍活性成分;以最大紫外吸收波长处的吸光度为评价指标,通过单因素实验、Box-Behnken设计和响应曲面法考察了提取温度、提取时间、液料比等对提取效果的影响,对赤芍的提取工艺进行了优化分析;采用毛细管电泳法对所得赤芍水提液进行分离检测,并对不同产地赤芍的活性成分含量进行了比较分析。确定赤芍活性成分的最优提取条件为:提取温度89.99℃、提取时间75.32min、液料比79.25∶1(mL∶g),在此条件下,赤芍水提液的吸光度预测值为0.3022,实测值为0.2899,表明该方法预测效果良好,可为中药活性成分的微波辅助提取提供参考。     

三种中成药中乌头生物碱飞行时间质谱分析

对风湿骨康片、骨刺消痛胶囊和消痛灵酊3种中成药中的乌头生物碱提取分离后,进行基质辅助激光解吸电离-飞行时简质谱和电喷雾-四极杆飞行时间串联质谱分析.发现在这3种中成药中含有双酯型生物碱、其水解产物单酯生物碱以及尼奥灵类生物碱等11种生物碱.苯甲酰中乌头原碱是前两类口服药中的主要生物碱成分.而消痛灵酊中则以次乌头碱为主.     

Analysis of volatile chemical components of Radix Paeoniae Rubra by gas chromatography-mass spectrometry and chemometric resolution

The volatile chemical components of Radix Paeoniae Rubra (RPR) were analyzed by gas chromatography-mass spectrometry with the method of heuristic evolving latent projections and overall volume integration. The results show that 38 volatile chemical components of RPR are determined, accounting for 95.21% of total contents of volatile chemical components of RPR. The main volatile chemical components of RPR are (Z, Z)-9,12-octadecadienoic acid, n-hexadecanoic acid, 2-hydroxy- benzaldehyde, 1-(2-hydroxy-4-methoxyphenyl)-ethanone, 6,6-dimethyl-bicyclo[3.1.1] heptane-2-methanol, 4,7-dimethyl-benzofuran, 4-(1-methylethenyl)-1-cyclohexene-1-carboxaldehyde, and cyclohexadecane.     

On canonical number systems

Let be such that d1,p_d=1,p₀2 and . We are proving in this note a new criterion for the pair to be a canonical number system. This enables us to prove that if p₂,…,p_d−1,∑_i=1^dp_i0 and p₀>2∑_i=1^d|p_i|, then is a canonical number system.     

中药羌活黄酮的超声波提取研究

利用超声辅助提取中药羌活中黄酮类化合物,通过正交设计试验优化羌活中黄酮的超声提取工艺条件。结果表明,在料液比1∶40(g·mL^-1)、提取温度60℃、乙醇浓度80%、提取时间20 min的条件下黄酮提取率最高,达5.703%。