甲硝唑与钴（Ⅱ）、镍（Ⅱ）配合物的合成及与DNA作用

甲硝唑与过渡金属钴（Ⅱ）、镍（Ⅱ）的卤盐反应得到配合物[Co（C6H9O3N3）2Br2]（1）和[Ni（C6H9O3N3）2Cl2]·2H2O（2）,通过元素分析、红外光谱分析及热重分析对配合物可能的组成进行了表征.并进一步对两种配合物与DNA的相互作用进行研究,光谱分析及黏度分析表明两者均以部分插入的方式与DNA的相互作用.     

一种新的甲硝唑荧光光纤传感器的研制

将1,4-二(苯并(噁)唑-1',3'-基-2')苯(BBOB)包埋在增塑的聚氯乙烯膜中,研制了一种新的荧光猝灭型甲硝唑光纤传感器.猝灭机制包括甲硝唑的初级内滤效应和甲硝唑与BBOB形成电荷转移复合物两种作用.传感器可逆性好,响应时间小于30s,响应线性范围是4.00×10^-6～1.00×10^-4mol/L,检测限为1.00×10^-6mol/L,对1.00×10^-4mol/L甲硝唑的相对偏差为0.82%(n=10).常见的无机离子、药物不影响甲硝唑的测定,对商品制剂中甲硝唑的测定结果与药典法一致.     

甲硝唑、替硝唑和奥硝唑药品的远红外与太赫兹吸收光谱研究

甲硝唑、替硝唑和奥硝唑为5′-硝基咪唑类化合物,常用于抗厌氧菌和抗滴虫治疗。运用太赫兹时域光谱技术(THz-TDS)和傅里叶变换红外光谱(FTIR)技术在室温环境中测量了三种药品在0.9～19.5THz波段的光谱特性,得到其指纹谱。另外,通过探测替硝唑参照品和不同厂家、不同批次替硝唑药片在太赫兹波段的光谱信息,结合相关系数法、阵列相关系数法等信息处理技术对光谱信号进行数据挖掘;最终建立了一种能够快速、有效、系统地鉴定替硝唑片活性成分和稳定性的分析方法。研究结果为此类药品生产和销售质量的规范化和现代化提供了可视化途径。     

小波变换-偏最小二乘算法及其在复方甲硝唑注射液分析中的应用

提出了结合小波变换的偏最小二乘法（ＷＰＬＳ）,即先对光谱信号进行小波变换,去除噪声,再用偏最小二乘法对多组分同时测定。将该法用于模拟体系及复方甲硝唑注射液体系,结果表明,该法优于偏最小二乘法。     

甲硝唑的伏安研究及其分析应用

本研究了甲硝唑在金微上电极上的３伏安行为，考虑了底液、人体内微量共存物质及表面活性剂对甲硝唑还原行为的；知０．２ｍｏｌ／Ｌ柠檬酸二氧钾底液中，甲硝唑的浓度与ｉｐ（Ｅｐ＝－０．４６ＶＵＳ Ａｇ／ＡｇＣｌ）在０．５０－２２００μｇ／ｍＬ范围内存在良好的线性关系，在检测限为０．２０μｇ／ｍＬＲＳＤ为５．０４％（ｎ＝８）．电极过程为一含有咐附的受扩散控制的不可逆氧化还原过程。     

Determination of dimetridazole and metronidazole in poultry and porcine tissues by gas chromatography-electron capture negative ionization mass spectrometry

A sensitive and selective method using gas chromatography-electron capture negative ionization mass spectrometry (GC-ECNI-MS) for analysis of dimetridazole (DMZ) and metronidazole (MNZ) in poultry muscles, porcine kidney and liver, and chicken liver, was developed and validated for the purpose of food surveillance testing of the residues of these two nitroimidazoles in various types of animal tissues in the Hong Kong Special Administrative Region. Before homogenization and extraction with toluene, [2H₃]dimetridazole-(DMZ-d³) and secnidazole (SNZ) were added to tissue samples as internal standards. The organic extracts were mixed with n-hexane and subject to solid-phase extraction cleanup by amine extraction columns. MNZ and SNZ were derivatized with BSA prior to GC-ECNI-MS determination. Good recovery and precision were obtained and the limit of detection was below parts per billion levels for poultry and porcine tissues. The method could also be applied for the detection of the hydroxylated metabolite of DMZ.     

Voltammetry and determination of metronidazole at a carbon fiber microdisk electrode

The electrochemistry of metronidazole, 1-(hydroxyethyl)-2-methyl-5-nitroimidazole, was investigated at a carbon fiber microdisk electrode in pH 9 Britton Robinson buffer. Under these conditions, the reduction of metronidazole is controlled by both mass transport to the microdisk and adsorption with an equilibrium constant of 4 × 10³ mol⁻¹ dm³ and a saturation coverage of 0.88 × 10⁻⁸ mol cm⁻². The adsorption and accumulation of metronidazole on the surface of the carbon fiber allows its determination at low concentrations by square wave adsorptive stripping voltammetry. A detection limit for metronidazole of 5 × 10⁻⁷ mol dm⁻³ and a R.S.D. of 3.7% at 1 × 10⁻⁶ mol dm⁻³ (n = 4) were obtained with a two electrode system with no stirring during the accumulation step. Based on this method, a simple procedure for the determination of metronidazole in urine is described which requires no pre-treatment of the sample before analysis.     

Simultaneous determination of metronidazole and tinidazole in plasma by using HPLC–DAD coupled with second-order calibration

<正>A method using HPLC-DAD coupled with second-order calibration was developed to simultaneously determine metronidazole and tinidazole in plasma samples in this paper.The second-order calibration method based on APTLD(alternating penalty trilinear decomposition) algorithm was proposed to analyze the three-way HPLC-DAD data from both standard and prediction samples, which makes it possible that calibration can be performed even in the presence of unknown interferences with a simple and green chromatographic condition and short analysis time.The results showed that good recoveries were obtained although the chromatographic and spectral profiles of the analytes of interest as well as background were partially overlapped with each other in plasma samples.     

联立方程组新解法测定面康净片中两组分含量

采用联立方程组新解法不经提取分离直接测定面康净片中甲硝唑和维生素Ｂ６的含量。甲硝唑和维生素Ｂ６的平均回收率和相对标准偏差分别是１０１．４％，０．９７％和１００．６％，１．３１％。方法简便、快速、准确。     

Kinetic‐Spectrophotometric Determination of Metronidazole Benzoate in Surfactant Medium

A kinetic method for the accurate and sensitive determination of metronidazole benzoate (MB) has been described. The method is based on the oxidation of MB with KMnO₄ in alkaline medium in the presence of sodium dodecyl sulphate (SDS). At a fixed time of 10 min, the formed magnate ion is spectrophotometrically measured at 610 nm. The determination of MB by the fixed‐concentration and rate constant method is feasible with the calibration equation obtained, but the fixed‐time method proves to be more applicable. The proposed method was successfully used for the quantitative determination of MB in suspended oral syrup after the separation of MB with a simple separation method. Beer's law was obeyed from 0.55 mgL^?1 to 33 mgL^?1 and the RSD% value for syrup was 3.44. The results obtained agreed with those obtained by the BP method.