共查询到20条相似文献,搜索用时 64 毫秒
1.
2.
3.
4.
5.
6.
7.
在酸性条件下,Ce(Ⅳ)-罗丹明6G发光体系有较强的化学发光,盐酸多西环素及土霉素的存在能抑制其发光。且化学发光信号的减小值(ΔI)与盐酸多西环素及土霉素的浓度在一定的范围内有较好的线性关系。据此结合流动注射技术,建立了快速测定盐酸多西环素及土霉素的流动注射化学发光分析新方法。优化了影响化学发光的各种因素。结果表明在优化的条件下,盐酸多西环素及土霉素的线性范围分别是1.0×10-7~1.0×10-4g/mL,1.0×10-6~1.0×10-4g/mL,测定的检出限为5.0×10-8g/mL及2.7×10-7g/mL,对1.0×10-6g/mL的盐酸多西环素及1.0×10-5g/mL的盐酸土霉素分别进行了9次平行测定,其相对标准偏差分别为1.4%、1.6%。方法已用于盐酸多西环素及土霉素片剂的测定。 相似文献
8.
流动注射-化学发光法测定半胱氨酸 总被引:3,自引:1,他引:3
在酸性条件下,半胱氨酸对Ru(phen)32+-Ce(Ⅳ)反应体系化学发光有显著的增强作用,据此建立了流动注射-化学发光法检测半胱氨酸的新体系。对影响流动注射化学发光的各因素进行了实验研究,优化了反应条件和各项测定参数。结果表明,在优化条件下,半胱氨酸在1.0×10-8~8.0×10-7g/mL的范围内发光强度与其质量浓度呈良好的线性关系,检出限(3σ)为3.7×10-9g/mL,对质量浓度为2.0×10-7g/mL的半胱氨酸进行11次平行测定,相对标准偏差(RSD)为3.3%。对合成样品中半胱氨酸测定的回收率在98%~102%之间,采样频率为90次/h。并对其可能的反应机理进行了探讨。 相似文献
9.
10.
11.
A rapid and precise continuous-flow method is described for the determination of propranolol based on the chemiluminescence (CL) produced by its reaction with potassium permanganate in a sulphuric acid medium. The optimum chemical conditions for the chemiluminescence emission were investigated. Two manifolds were tested and their characteristics such as the length of the reactor, injection volume and flow rate were compared. When using the selected manifold, propranolol gives a linear calibration graph over the concentration range 1.0-17.5 mg l−1. The detection limit calculated as proposed by IUPAC was 70 ng ml−1 and the detection limit calculated as proposed by Clayton was 0.87 mg l−1. For analysis of 10 solutions of 10.0 mg l−1 propranolol, if error propagation theory is assumed, the relative error was 0.1%. The standard deviation (S.D.) for 10 replicate samples was 0.07 mg l−1. The method has been validated versus a published fluorimetric method.The present chemiluminescence procedure was applied to the determination of propranolol in simple British and Spanish pharmaceutical formulations, with excellent recoveries, as the determination is free from interference from common excipients. However, some drugs, such as hydralazine and bendroflumethizide which may also be present in the formulation, increase the emission intensity. 相似文献
12.
A simple, sensitive and selective flow injection-chemiluminescence method for the determination of sulfadiazine in compound naristillae has been investigated. It is based upon the chemilimunescence reaction of sulfadiazine, formaldehyde and potassium permanganate in polyphosphate acid medium. The optimum conditions for the chemiluminescence emission were investigated. Under the optimum conditions, the linear range for the determination of sulfadiazine was 8.0 × 10−7 to 2.0 × 10−4 mol/L with a detection limit of 2.0 × 10−7 mol/L calculated as proposed by IUPAC and a relative standard deviation of 2.53% for 11 solutions of 5.0 × 10−5 mol/L sulfadiazine on the same day. It was also found that the coexisting ephedrine hydrochloride did not interfere with this determination. This led to the successful application of the proposed method for the direct and selective determination of sulfadiazine in compound naristillae. 相似文献
13.
流动注射化学发光分析法测定三类磺胺类药物 总被引:2,自引:0,他引:2
研究发现可溶性锰(Ⅳ)氧化磺胺类药物(磺胺甲基异口恶唑、磺胺嘧啶和磺胺脒)可以产生弱的化学发光,甲醛对这一化学发光反应有较强的增敏作用,据此建立了一种测定磺胺类药物的流动注射化学发光分析法。该方法对3种磺胺类药物磺胺甲基异口恶唑、磺胺嘧啶、磺胺脒的检出限分别为2×10-8、3×10-8、2×10-8g/mL;线性范围分别为6.0×10-8~1.0×10-5、1.0×10-7~8.0×10-6、4.0×10-8~8.0×10-6g/mL。对6.0×10-6g/mL磺胺甲基异口恶唑、4.0×10-6g/mL磺胺嘧啶和4.0×10-6g/mL磺胺脒的相对标准偏差分别为1.1%、1.2%和2.2%(n=11)。此法已用于复方新诺明片剂中磺胺甲基异口恶唑的测定,结果与药典方法测定值一致。并对化学发光反应的机理进行了探讨。 相似文献
14.
根据盐酸三氟拉嗪能显著增强铁氰化钾-鲁米诺体系的化学发光强度,建立了测定盐酸三氟拉嗪的流动注射-化学发光分析法.方法的线性范围为1.0×10-6~2.0×10-5 g/mL,2.0×10-5~1.0×10-4g/mL,线性相关系数分别为0.9996 和0.9990,相对标准偏差为1.4%(p=1.0×10-5 g/mL... 相似文献
15.
Cao W Mu X Yang J Shi W Zheng Y 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2007,66(1):58-62
It is found that phenol can react with potassium permanganate in the acidic medium and produce chemiluminescence, which is greatly enhanced by formaldehyde. The optimum conditions for this chemiluminescent reaction are in detail studied using a flow injection system. The experiments indicate that under optimum conditions, the chemiluminescence intensity is linearly related to the concentration of phenol in the range 5.0x10(-9) to 1.0x10(-6)gmL-1 with a detection limit (3sigma) of 3x10(-9)gmL-1. The relative standard deviation is 1.2% for 4.0x10(-7)gmL-1 phenol solution in 11 repeated measurements. This method has the advantages of simple operation, fast response and high sensitivity. The method is successfully applied to the determination of phenol in the waste water. 相似文献
16.
17.
A simple, sensitive and rapid colorimetric method is described for determining dimethoate [O,O-dimethyl-S-(N-methylcarbanoylmethyl)phosphorodithioate] and omethoate by an enzymatic method using pig liver acetone powder as enzyme source and p-nitrobenzenediazonium fluoroborate as the chromogenic reagent. This colorimetric method is more sensitive than non-enzymatic methods. Inhibition can be detected at ng levels and amounts ranging from 50 to 1000 ng of omethoate and from 1 to 10 mug of dimethoate can be estimated. 相似文献
18.
19.
A chromatographic method for the determination of transition metals in human hair samples is described. The method involves the separation of Cu, Pb, Zn, Ni, Co, Cd and Mn in a C18 column coated with sodium hexadecane-sulfonate (SHS) and spectrophotometric detection (520 nm) after post-column reaction of the eluted metals with 4-(2-pyridylazo)-resorcinol (PAR). The eluent was a 100 mM tartrate solution adjusted to pH 3.1 with a 2 M sodium hydroxide solution (flow-rate=1.0 ml min(-1)). A good separation of the eluted metals (specially for Cu/Pb and Zn/Ni) has been achieved. The detection limits, expressed as mug l(-1), were 2.2 (Cu), 8.0 (Pb), 2.8 (Zn), 1.5 (Ni), 1.5 (Co), 12.0 (Cd), and 1.4 (Mn). A microwave-assisted closed vessel acid digestion procedure with HNO(3)+HClO(4) (4+1 ml) was used for the hair samples solubilisation. Nineteen hair samples were analysed with the proposed method. The results were in good agreement with those obtained by atomic absorption spectrometry (AAS). 相似文献