基于纳米TiO2的化学发光法检测核黄素

纳米TiO2与NaOH溶液作用能产生化学发光辐射,在表面活性剂十六烷基三甲基溴化铵(CTAB)的存在下,核黄素的加入能增强纳米TiO2-NaOH溶液的化学发光强度。基于此,构建了纳米TiO2-NaOH溶液化学发光新体系,建立了纳米TiO2-NaOH-核黄素体系检测核黄素的化学发光新方法。在优化实验条件下,核黄素质量浓度在5.0×10-6～3.5×10-4g/mL范围内与化学发光强度呈良好的线性关系,检出限为3.0×10-6g/mL,对2.5×10-5g/mL的核黄素进行11次平行测定,相对标准偏差为2.9%。该方法用于维生素B2片剂的测定,其结果与药典方法测得一致。该文同时对化学发光反应的机理进行了初步探讨。     

Study on Chemiluminescence System of Potassium Permanganate-Sodium Hydrosulfite-Aminopyrine

A new flow injection Chemiluminescence method for the determination of aminopyrine was studied. It is based on the chemiluminescence reaction of potassium permanganate-sodium hydrosulfite-aminopyrine. The main factors which affect the determination were investigated. Under the most favorable conditions. The linear range for the determination of amimopyrine was 2.0×10^-7~8.0×10^-5g/mL,the determination limit was 6.0×10^-8g/mL,the relative standard deviation was 1.8% for 11 mesurements to 4.0×10^-6g/mL aminopyrine standard solution. This method has been applied to the determination of aminopyrine in medicine.     

流动注射-化学发光法测定片剂中氨基比林

采用流动注射技术 ,研究了氨基比林 -高锰酸钾 -连二亚硫酸钠体系的化学发光行为。对影响化学发光强度的诸因素进行了实验探讨 ,建立了化学发光法测定片剂中氨基比林的新方法。方法的检出限为 6× 1 0 -8g/m L,线性范围为2 .0× 1 0 -7～ 8.0× 1 0 -5g/m L。对浓度为 4.0× 1 0 -6g/m L的氨基比林的相对标准偏差为 1 .8%     

高锰酸钾-甲氧苄啶-硫代硫酸钠化学发光反应

在硫酸介质中,高锰酸钾可以氧化甲氧苄啶发生化学发光反应,硫代硫酸钠对这一化学发光反应有极强的增敏作用。采用流动注射技术,建立了高锰酸钾甲氧苄啶硫代硫酸钠化学发光体系测定甲氧苄啶的化学发光新方法．考察了各种影响因素,确立了反应的最佳条件。方法的检出限为３．８×１０－８　ｇ／ｍＬ甲氧苄啶;线性响应范围为１×１０－７～１×１０－５　ｇ／ｍＬ。对４×１０－６　ｇ／ｍＬ甲氧苄啶进行１１次平行测定,相对标准偏差为１．８％。方法已成功地用于片剂中甲氧苄啶含量的测定,结果与药典标准法测得值一致。     

超高效液相色谱-电喷雾串联质谱法测定饲料中残留的三聚氰胺

饲料样品经1%三氯乙酸-二甲基亚砜提取,Waters Oasis MCX柱净化,超高效液相色谱分离,最终采用电喷雾串联四极杆质谱进行检测。结果表明,三聚氰胺在饲料中的含量范围为10～5000 μg/kg时,线性关系良好(r＞0.99)。在10～100 μg/kg 的添加水平范围内的平均回收率为83%～94%,相对标准偏差为4.2%～6.5%。该方法的检出限为10 μg/kg。     

鸡蛋中三聚氰胺的液相色谱快速测定

建立了鸡蛋中三聚氰胺的液相色谱快速检测方法。样品经1%三氯乙酸溶液超声提取,磺基水杨酸和乙腈沉淀蛋白,高速离心分离,上清液过滤后直接由高效液相色谱分析。在优化的条件下,样品的色谱分析时间仅为10 min;三聚氰胺标准品在0.05～20 mg/L范围内,线性相关系数为0.9999;方法定量限为0.10 mg/kg (S/N＞10);1.0,2.0,4.0,6.0 mg/kg 4个加标水平测试,回收率在94.2%～107%之间;6次平行测试的相对标准偏差(RSD)为1.53%～2.06%。该方法前处理简单、分析速度快、灵敏度高,满足鸡蛋中三聚氰胺检验工作的快速测定要求。     

Stability-indicating methods for the determination of disopyramide phosphate

Four methods were developed for the determination of intact disopyramide phosphate in the presence of its degradation product. In the first and second methods, third-derivative spectrophotometry and first derivative of the ratio spectra were used. For the third-derivative spectrophotometric method, the peak amplitude was measured at 272 nm, while for the derivative ratio spectrophotometric method, disopyramide phosphate was determined by measuring the peak amplitude at 248 and 273 nm. Both methods were used for the determination of disopyramide phosphate in the concentration range 12.5-87.5 microg/mL, with corresponding mean recovery 100.8 +/- 0.7% for the first method and 99.9 +/- 0.7% and 99.6 +/- 0.7% for the second method at 248 and 273 nm, respectively. In the third method, an ion selective electrode (ISE) was fabricated using phosphotungstic acid as an anionic exchanger, PVC as the polymer matrix, and dibutylsebacate as a plasticizer. The ISE was used for the determination of disopyramide phosphate in pure powder form in the concentration range 10(-2)-10(-5) M. The slope was found to be 58.5 (mV/decade), and the average recovery was 99.9 +/- 1.6%. The fourth method depended on the quantitative densitometric determination of the drug in concentration range of 0.25-2.5 microg/spot using silica gel 60 F245 plates and ethyl acetate-chloroform-ammonium hydroxide (85 + 10 + 5, v/v/v) as the mobile phase, with corresponding mean accuracy of 100.3 +/- 1.1%. The 4 proposed methods were found to be specific for disopyramide phosphate in presence of up to 80% of its degradation product for the spectrophotometric methods, 90% of its degradation for the densitometric method, and 40% for the ISE method. The 4 proposed procedures were successfully applied for the determination of disopyramide phosphate in Norpace capsules. Statistical comparison between the results obtained by these methods and the official method of the drug was done, and no significant differences were found.     

Determination of aniline in environmental water samples by alternating-current oscillopolarographic titration

A new method for the determination of aniline in environmental water based on oscillopolarographic titration was presented in this paper. Several factors including the kind, concentration, and volume of acid, the dosage of potassium bromide, the temperature and concentration of concomitant substances were investigated in detail. The experimental results indicated that this method was simple, rapid, and sensitive. The linear range was 8.367×10-4 to 2.789×10-2 mol L-1, the relative standard deviation (R.S.D.) was lower than 0.96%, and the spiked recoveries of aniline in environmental water samples were in the range of 99.4-106.9% under the optimal conditions. The results indicated that the present method could be used as an alternative method for aniline determination in realworld water samples.     

流动注射化学发光法测定头孢他啶

在碱性条件下,头孢他啶对金纳米粒子催化高锰酸钾氧化鲁米诺化学发光体系的发光强度具有明显的增敏作用,基于此建立了一种测定头孢他啶的化学发光方法.在优化实验条件下,用该法测定头孢他啶的线性范围为3.0×10-5～5.0×10-2 g/L,检出限为1.0×10-5 g/L,相对标准偏差为2.0%(ρ=4.0×10-3 g/L...     

N-溴代琥珀酰亚胺-二氯荧光素化学发光体系测定废水中5-磺基水杨酸

建立了测定5-磺基水杨酸的流动注射化学发光新方法。 研究了影响化学发光强度的因素,并初步探讨了可能的发光机理。 在最佳化学发光条件下,化学发光强度与5-磺基水杨酸浓度在5.0×10-8~2.0×10-5 mol/L范围内呈良好的线性关系,检出限为1.0×10-8 mol/L,对5.0×10-6 mol/L的5-磺基水杨酸平行测定9次,其相对标准偏差为2.7%。 该法可用于强力霉素废水中5-磺基水杨酸的测定。     

流动注射化学发光分析法测定卡马西平

基于酸性条件下溴化钠对NaIO4-H2O2-卡马西平化学发光反应体系具有明显的增敏作用,结合流动注射技术建立了一种测定卡马西平的新方法.在优化的实验条件下,方法的线性范围为1.0×10-9～8.0×10-6g/mL,检出限为3.6×10-10g/mL,相对标准偏差为2.5％(c=2.0×10-7g/mL,n=11),回收率在98.4％～100.6％间.     

电感耦合等离子体质谱法测定拉考沙胺注射液中10种杂质元素

拉考沙胺注射液样品用稀释剂定容至100.0mL,采用电感耦合等离子体质谱法测定样品溶液中锂、钒、钴、镍、铜、砷、镉、锑、汞、铅等10种杂质元素的含量。采用内标法定量,10种杂质元素的检出限(3s/k)为0.002~0.040μg·L^-1,测定下限(10s/k)为0.007~0.120μg·L^-1。以空白样品为基体进行加标回收试验,所得回收率为95.2%~124%,测定值的相对标准偏差(n=6)为1.0%~2.5%。通过风险评估和每日最大推荐剂量,确定了拉考沙胺注射液中各杂质元素的每日允许暴露量与各杂质元素的含量限度。     

催化荧光光度法测定血红蛋白

基于血红蛋白(Hb)对过氧化氢氧化靛蓝胭脂红体系的催化作用,建立了模拟酶催化荧光光度法测定血红蛋白的新方法并对催化氧化反应的机理进行了初步探讨。实验发现体系的荧光强度与血红蛋白浓度在6.20×10-11~7.75×10-8mol/L范围内线性关系良好,方法的检出限为1.67×10-11mol/L。方法用于人血中血红蛋白含量的测定,回收率为98.8%~103.2%。     

Simultaneous determination of dapsone and pyrimethamine by derivative spectrophotometry in pharmaceutical formulations

A simple and fast method was developed for the simultaneous determination of dapsone and pyrimethamine by first-order digital derivative spectrophotometry. Acetonitrile was used as a solvent to extract the drugs from the pharmaceutical formulations, and the samples were subsequently evaluated directly by digital derivative spectrophotometry. The simultaneous determination of both drugs was performed by the zero-crossing method at 249.4 and 231.4 nm for dapsone and pyrimethamine, respectively. The best signal-to-noise ratio was obtained when the first derivative of the spectrum was used. The linear range of determination for the drugs was from 6.6 x 10(-7) to 2.0 x 10(-4) and from 2.5 x 10(-6) to 2.0 x 10(-4) mol/L for dapsone and pyrimethamine, respectively. The excipients of commercial pharmaceutical formulations did not interfere in the analysis. Chemical and spectral variables were optimized for determination of both analytes. A good level of repeatability, 0.6 and 1.7% for dapsone and pyrimethamine, respectively, was observed. The proposed method was applied for the simultaneous determination of both drugs in pharmaceutical formulations.     

超高效液相色谱–串联质谱法测定生活饮用水中10种农药残留

采用超高效液相色谱–串联质谱法测定生活饮用水中10种农药残留。水样直接进样,选用Waters ACQUITY UPLC~BEH C_(18)柱分离,以乙腈–0.1%甲酸溶液为流动相进行梯度洗脱,质谱选用多反应监测模式分析,10种农药的质量浓度在0.5~50μg/L范围内与色谱峰面积呈线性相关,检出限(3S/N)在0.03~0.50μg/L之间,测定值的相对标准偏差在1.14%~9.91%之间,加标回收率在91.6%~107.1%之间。该法简便准确,适用于生活饮用水中农药残留的检测。     

基于微孔板化学发光法检测碱性磷酸酶的研究

CDP-Star能被ALP迅速水解,且水解产物能够持续发光.本研究对化学发光法检测ALP的反应条件进行了优化.优化后的反应条件为:125 μtmol/L的CDP- Star在pH 9.5缓冲液中,37℃下与ALP反应10min.在此条件下,△RLU与ALP的活力呈线性关系.因此,建立了一种基于微孔板化学发光法检测ALP的实验方法.结果表明,本方法检测ALP的检测线性范围是0.05～10 U/L和10～1000 U/L,相对于光吸收法具有速度快、灵敏度高、重复性好等优点.因此,本方法可以被开发成试剂盒,应用于高通量全自动生化分析仪的测试分析.     

鲁米诺-过氧化氢-纳米银化学发光体系测定药物中的对乙酰氨基酚

碱性条件下,对乙酰氨基酚对鲁米诺-过氧化氢-纳米银化学发光体系有较强的抑制作用,基于此,结合流动注射技术,建立了测定对乙酰氨基酚的新方法。 研究了影响化学发光强度的各种因素,并初步探讨了可能的发光机理。 在最佳实验条件下,对乙酰氨基酚浓度在2.0×10-8～1.0×10-4 mol/L范围内与相对发光强度呈线性关系,检出限(3σ)为4.0×10-9 mol/L。 对1.0×10-7 mol/L的对乙酰氨基酚平行测定9次,相对标准偏差为2.6%。 该法用于片剂中扑热息痛含量的测定,结果令人满意。     

Trace determination of cobalt ion by using malic acid-malonic acid double substrate oscillating chemical system

A novel kinetic method for determination of trace amounts of cobalt ion was proposed and validated. The method is based on adding malic acid into classical Belousov-Zhabotinskii （B-Z） oscillating chemical system to form a double substrate one. The results showed that when the concentration of cobalt ion was in the range of 5.27× 10^-8 to 5.37 × 10^-12 mol L^-1, the change of the oscillating period was directly proportional to the negative logarithm of cobalt ion concentration. The sensitivity and precision of the developed method were quite satisfactory. The limit of detection was down to 5.20 × 10^-13 mol L^-1 which was a highest sensitivity found for determination of metal ions using oscillating chemical reaction so far. Some factors influencing the determination were also examined. The method has been successfully used to determine cobalt ion in vitamin B12 injection.     

中空纤维液相微萃取-高效液相色谱法测定纺织品中10种含氯苯酚类化合物

建立了中空纤维液相微萃取-高效液相色谱法测定纺织品中10种含氯苯酚类化合物的方法。系统地优化了影响萃取效率的因素,得到的最佳萃取条件为：萃取溶剂为正己烷,接受相NaOH溶液的浓度为0.10 mol/L,萃取时间为60 min,搅拌速度为600 r/min。在最佳萃取条件下,10种含氯苯酚在0.01～1.00 mg/L范围内线性关系良好（r>0.999）,10种含氯苯酚的检出限（信噪比为3）为0.01 mg/kg,富集倍数为95～101。在空白样品中添加0.01、0.05和0.1 mg/kg 3个不同水平的10种含氯苯酚类化合物,其平均回收率为78.8%～105.1%,相对标准偏差为0.3%～7.3%。研究结果表明该方法灵敏度高、简便、准确,可用于纺织品中含氯苯酚类化合物的测定。     

聚乙烯醇-亚铁氰化钾修饰电极测定油/水型乳液中氢过氧化物含量

建立了聚乙烯醇(PVA)-亚铁氰化钾修饰电极方波伏安法测定油/水(O/W)型乳液中氢过氧化物含量的方法。对电极修饰条件和氢过氧化物测量的主要参数进行了研究。结果表明,当亚铁氰化钾浓度为0.08 mol/L,分别修饰1μL亚铁氰化钾和1μL0.2%PVA时,修饰电极的电流响应值最强。在优化实验条件下,亚铁氰化钾氧化峰电流的降低值与氢过氧化物浓度在1.48×10-6～1.34×10-4mol/L范围内呈良好的线性关系,R2=0.9981,检出限为1.7×10-7mol/L。所建立的方法稳定性好,精密度高,能灵敏、准确地测量O/W型乳液中氢过氧化物含量。