Batch‐injection versus Flow‐injection Analysis Using Screen‐printed Electrodes: Determination of Ciprofloxacin in Pharmaceutical Formulations

This article highlights the potential use of multi‐walled carbon‐nanotube modified screen‐printed electrodes (SPEs) for the amperometric sensing of ciprofloxacin and compares the association of batch‐injection analysis (BIA) and flow‐injection analysis (FIA) with amperometric detection. Both analytical systems provided precise (RSD<5 %) and sensitive determination of ciprofloxacin (LOD<0.1 μmol L^?1) within wide linear range (up to 200 μmol L^?1). Accuracy of both methods was attested by recovery values (93–107 %) and comparison with capillary electrophoresis. The BIA system is completely portable (especially due to association with SPEs) and provided faster analyses (130 h^?1) and more sensitive detection than the FIA system due to the higher flow rates of injection.     

Electrochemical and Molecular Dynamics Evaluation on Inhibition Performance of 2-(1-Methyl-Nonyl)-Quinoline

A novel vapor phase inhibitor, 2-(1-methyl-nonyl)-quinoline, was designed to cope with top-of-line corrosion (TLC) in wet gas pipelines and characterized via electrochemical measurements, scanning vibrating electrode technique (SEVT), surface analysis techniques, and molecular dynamics methods. 2-(1-methyl-nonyl)-quinoline showed parallel adsorption and was predominantly a cathodic-type inhibitor. The inhibition efficiency increased with temperature (30–50°C) and pH (4.15–5.76), and reached 97.25% at a concentration of 0.0282 mol/L. The SEVT showed that the average current density of the X80 steel specimen without inhibitor (anode region, 6.58087 µA/cm²) was about 2.5 times that of the other with inhibitor (cathode region, ?2.61974 µA/cm²).     

Synthesis of Quinolone Analogues： 7-[2-Aminomethylaziridin-l-yl]- quinolones

New quinolone derivatives of 7-[2-aminomethylaziridin-1-yl]quinolone-3-carboxylic acids were synthesized. The structures of these compounds were characterized by 1H NMR and HRESI-MS.     

Ammonium iodide-mediated regioselective chalcogenation of chromones with diaryl disulfides and diselenides

A metal-free method for the synthesis of 3-chalcogenyl-chromones/quinolones from chromones/quinolones and diorganyl dichalcogenides using ammonium iodide under air was developed. This approach allowed the preparation of a wide range of 3-selenyl- and 3-sulfenyl-chromones/quinolones in good to excellent yields.     

可见光催化有氧脱氢合成2,3-二氢-4-吡啶酮与4-喹诺酮

报道了一种可见光促进4-哌啶酮及2,3-二氢-4-喹诺酮的有氧脱氢化方法.研究中通过使用一种二腈基哌嗪化合物（dicyanopyrazine-derived chromophore,DPZ）为光催化剂,能够以令人满意的分离产率（最高75%）分别合成出2,3-二氢-4-吡啶酮与4-喹诺酮.本反应为这两类重要含氮杂环化合物提供了一种直接的、可持续的以及高原子经济性的合成途径.     

新型香豆素硼氟荧光染料的合成及其光学性能

以邻氨基苯甲酸甲酯和4-二乙胺基水杨醛为原料,合成了一个新的香豆素喹啉衍生物3-{2-［8-(1H-苯并咪唑-2-基)喹啉-2-基］乙烯基}-7-二乙胺基香豆素(QMC),再与BF₃·Et₂O配位合成了硼氟配合物(BQMC),其结构经¹H NMR和MS(ESI)表征。并对BQMC的光学性能进行了研究。结果表明：BQMC的最大吸收波长在二氧六环中为490 nm,在DMSO中为532 nm; BQMC的最大发射波长在正己烷中为618 nm,在DMSO中为679 nm,与配体QMC相比,最大吸收波长红移了近50 nm,最大发射波长红移了近100 nm, BQMC的Stokes位移值从115 nm增至183 nm。在固态下,BQMC在750~825 nm之间有较宽的荧光发射峰,具有较强荧光。     

高效液相色谱-串联质谱法测定动物组织中的16种喹诺酮类药物残留

建立了动物组织样品中萘啶酸、恶喹酸、氟甲喹、诺氟沙星、依诺沙星、环丙沙星、洛美沙星、丹诺沙星、恩诺沙星、氧氟沙星、沙拉沙星、二氟沙星、麻保沙星、培氟沙星、司帕沙星、奥比沙星等16种喹诺酮类兽药多残留量的高效液相色谱-串联质谱测定方法。用酸性乙腈萃取样品中的16种喹诺酮类药物残留,然后用正己烷脱脂,旋转蒸发浓缩,以Inertsil C8-3色谱柱分离,在正离子模式下以电喷雾电离串联质谱进行测定。在10,50,100 μg/kg 3个加标水平下进行了验证试验,方法的线性范围为10~100 μg/kg,平均回收率为62.4%~102%,相对标准偏差为1.4%~11.9%。该方法简便、快速、准确,各项技术指标满足国内外法规的要求,可用于鸡肉、鸡肝和鱼肉等动物组织样品中喹诺酮类药物多残留的确证检测。     

喹诺酮药物的定量结构-活性关系

喹诺酮类抗菌素是一类重要的抗茵药物．本文对32个喹诺酮类分子进行了HF／6—31G＊水平的结构优化,在优化结构上获得了分子的表面静电势分布,并在此基础上对其统计导出的参数进行了计算,同时计算了反映三维信息的3D-Morse参数,其后,运用多元线性回归方法对喹诺酮分子抑制金黄色葡萄球菌DNA促旋酶（QR—gY—rase）活性、人类Ⅱ型拓扑异构酶（TOPO—Ⅱ）的抑制活性、以及二者抑制活性之差与分子的结构参数进行了关联．结果表明：分子静电势参数结合三维3D-Morse参数可以很好地用于喹诺酮类化合物抑制DNA促旋酶、TOP（3-Ⅱ活性与分子结构间的定量关系,并能有效地区分抑制两种酶的活性;同时结合3D-Morse参数的静电势参数被成功应用到定量结构-活性关系研究中．     

Synthesis of 6-chloro and 6-fluoro-4-hydroxyl-2-quinolone and their azo disperse dyes

<正>In this study,6-chloro-4-hydroxy-2-quinolone and 6-flouro-4-hydroxy-2-quinolone were synthesized from corresponding dianilides.These compounds were coupled with some diazotized aromatic amines to give the corresponding azo disperse dyes.The structures of the quinolone derivatives and new azo dyes were confirmed by UV-vis,FT-IR,~1H NMR and elemental analysis.     

Facile synthesis of 6,6,8,6,6-ring fused pentacyclic heterocycles: annelation of quinolines to quinoxalines under PTC condition

An efficient and simple synthesis of pentacyclic quinolonoquinoxalinooxazocines in a one-pot sequence has been performed by unique application of phase transfer catalysis. Preparative simplicity and conceptual novelty of the methodology offer an attractive general application for the synthesis of novel quinoline antibiotics.