流动系统中鲁米诺电生化学发光(ECL)系统研究初探

本文描述了一个新的鲁米诺电生化学发光流动系统.通过微铂电极流动池,H2O2被还原为OH-以维持鲁米诺化学发光所要求的pH条件.本文对鲁米诺化学发光机理进行了初步探讨,并详细研究了ECL的最佳条件,该系统明显降低了反应噪声,优于混合反应系统,可作为液相色谱间接测定检测器.     

Con-A诱发的淋巴细胞化学发光

本文以刀豆素 A(ConA)为诱发剂,研究了绵羊肺淋巴液中的淋巴细胞鲁米诺依赖的化学发光现象.结果表明,ConA诱发的淋巴细胞化学发光测定具有迅速、简便和敏感等优点,可作为淋巴细胞活化的检测方法.淋巴细胞悬液(106～107个细胞/ml)1ml、ConA溶液(2mg/ml)0.1ml、鲁米诺溶液(10-3M)50μl为最佳测定体系.多形核白细胞(PMN)混杂可明显增强发光体系的发光强度.因此,测定外周血中的淋巴细胞化学发光,细胞的纯化是一个不可忽视的问题.消炎痛可抑制其发光,说明发光可能与花生四烯酸代谢有关.     

鲁米诺-H2O2流动注射化学发光法测定乐果

在碱性介质中,乐果能够有效增强鲁米诺-H2O2体系的化学发光,据此建立了测定乐果的流动注射化学发光分析方法,并对反应的机理进行了探讨.在最佳条件下,乐果-鲁米诺-H2O2体系化学发光强度在2s内达到了最大值,乐果在5.0×10-8-1.0×10-5 g/mL范围内呈良好的线性关系,检出限(S/N=3)为1.5×10-8 g/mL.该体系应用于加标蔬菜样品测定,乐果测定回收率为108.0%-119.3%,测定偏差为2.7%-4.6%.化学发光的机理可能是由于乐果先被过氧化氢氧化生成过氧化磷酸盐,过氧化磷酸盐氧化鲁米诺生成激发态,从而产生发光.     

过氧化氢－次氯酸钠氧化鲁米诺发光的研究

过氧化氢－次氯酸钠可氧化碱性鲁米诺而产生强比学发光，对影响发光的诸因素及化学发光机理进行了研究，并探讨了该化学发光反应在过氧化氢测定中的应用     

鲁米诺化学发光法测定食品中的二氧化硫残留量

建立了一种测定食品中二氧化硫残留量的方法。以鲁米诺作为发光剂,空气中的氧气作为氧化剂,亚硫酸根作为敏化剂,硫酸钴作为鲁米诺-空气-亚硫酸根离子化学发光体系的催化剂,通过测定加入亚硫酸盐溶液前后体系的发光总强度的变化,可确定亚硫酸盐的浓度。应用该方法可准确测定干果干菜等食品中二氧化硫残留量。     

过氧化氢—次氯酸钠氧化鲁米诺发光的研究

过氧化氢－次氯酸钢可氧化碱性鲁米诺而产生强化学发光，对影响发光的诸因素及化学发光机理进行了研究，并探讨了该化学发光反应在过氧化氢测定中的应用。     

影响鲁米诺体系电致化学发光因素的研究

系统研究了鲁米诺体系的电致化学发光行为 ,发现电学参数和溶液的酸碱性很大程度地影响电化学发光的产生、光强及连续性。确定了在碱性环境中的最佳电化学发光条件 ,发现在 KOH- KCl( p H=12 .5)介质中 ,于 Pt电极上施加 +1.3V( vs.Ag/ Ag Cl)的正矩形脉冲 ,可得到鲁米诺的最佳发光信号。发光强度与鲁米诺的浓度在 1.0× 10 -7— 1.0× 10 -5mol/ L范围内呈线性关系。并讨论了 H2 O2 及硫脲对鲁米诺的电致化学发光的影响。     

流动注射-化学发光法用于药物分析研究进展

简述了近年来国内外流动注射-化学发光法在药物分析领域中的主要运用。主要介绍了鲁米诺-H2O2体系、鲁米诺-铁氰化钾体系、鲁米诺-高碘酸盐体系、鲁米诺-KMnO4体系、鲁米诺-Ag(Ⅲ)配合物体系以及其他体系在药物分析中的运用。     

Cu2+对鲁米诺阳极电致化学发光的抑制作用

本文研究了Ｃｕ＾２＋对碱性鲁米诺阳极电致化学发光的影响,发现Ｃｕ＾２＋对发光峰强度有明显的抑制作用。通过对溶液ｐＨ值及离子强度、溶液中支持电解质种类、理米诺浓度和ＥＤＴＡ对抑制作用影响的讨论,结合Ｐｔ电极表现ＸＰＳ谱图的分析结果,给出了可能的抑制机理;非常微小的Ｃｕ（ＯＨ）２分子聚体参与了电极氧化过程中双电层的形成,阻碍了电化学发光活性物质的生成和传质速率。在一定条件下,发光峰强度的减小量与Ｃｕ＾     

鲁米诺增强声致发光应用研究的进展与问题

本文结合自己的工作，介绍了化学发光剂鲁米诺增强声致发光应用研究中的几种典型情况，并相应地 一些得到探讨的问题。     

丙酮敏化光泽精氧化发光反应的研究及应用

本文研究了H2O2-ClO-氧化光泽精发光的特性及丙酮的敏化作用,对发光和敏化机理进行了探讨,同时还研究了丙酮敏化光泽精氧化发光反应的分析应用.     

Flow‐Injection Chemiluminescence Study of Luminol–Hydrogen Peroxide–Carbendazim System

Abstract

A new flow‐injection chemiluminescence (CL) method is described for the determination of carbendazim. The method is based on the CL reaction of luminol and hydrogen peroxide (H₂O₂). Carbendazim can greatly enhance the chemiluminescence intensity in sodium hydroxide–sodium dihydrogen phosphate (NaOH–NaH₂PO₄) medium (pH=12.6). Under the optimum conditions, the linear range for the determination of carbendazim is 2.00×10^?8 to 2.00×10^?6 g mL^?1 with a detection limit (S/N=3) of 7.24×10^?9 g mL^?1. The relative standard deviation is 1.8% for 1.0×10^?7 g mL^?1 carbendazim (n=8). The proposed method has been applied to the determination of carbendazim in tap‐water samples. Furthermore, the possible enhanced CL mechanism is discussed by examining the CL spectra and fluorescence spectra.     

异丙醇-ClO——H2O2化学发光新体系研究

本文首次报道异丙醇-ClO--H2O2新体系的化学发光,对影响该化学发光反应的因素进行了研究,并探讨了该发光新体系的分析应用和反应机理。     

丙酮化学发光反应中卤素离子敏化效应的研究

本文报导了丙酮化学发光反应中卤素离子的敏化效应,对其敏化机理进行了探讨,并研究卤素离子敏化效应的分析应用。     

Determination of Montelukast in Plasma Using β − Cyclodextrins Coated on CoFe<Subscript>2</Subscript>O<Subscript>4</Subscript> Magnetic Nanoparticles in Luminol–H<Subscript>2</Subscript>O<Subscript>2</Subscript> Chemiluminescence System Optimized by Doehlert Design

A novel chemiluminescence method using β ? cyclodextrins coated on CoFe₂O₄ magnetic nanoparticles is proposed for the chemiluminometric determination of montelukast in plasma. The effect of coated β ? cyclodexterinon CoFe₂O₄ magnetic nanoparticles in the chemiluminescence of luminol–H₂O₂ system was investigated. It was found that β ? cyclodexterin coated on CoFe₂O₄ magnetic nanoparticles could greatly enhance the chemiluminescence of the luminol–H₂O₂ system. Doehlert design was applied in order to optimize the number of experiments to be carried out to ascertain the possible interactions between the parameters and their effects on the chemiluminescence emission intensity. This design was selected because the levels of each variable may vary in a very efficient way with few experiments. Doehlert design and response surface methodology have been employed for optimization pH and concentrations of the components. Results showed under the optimized experimental conditions, the relative CL intensity (ΔI) is increased linearly in the concentration range of 0.003–0.586 μgml^?1 of montelukast with limit of detection (LOD) 1.09 × 10^?4 μgml^?1 at S/N ratio of 3, limit of quantitative (LOQ) 3.59 × 10^?4 μgml^?1 and the relative standard deviation 2_.63 %. The method has been successfully applied to the determination of montelukast in plasma of human body. Results specified that relative chemiluminescence intensity (ΔI) has good proportional with the montelukast concentration with R² = 0.99979. The test of the recovery efficiency for known amounts of montelukast was also performed, the recoveries range obtained from 98.2 to 103.3 %, with RSDs of <4 % indicated that the proposed method was reliable.     

The growth of Y2SiO5:Ce thin films with pulsed laser deposition

Y₂SiO₅:Ce phosphor thin films were grown onto Si(100) substrates with pulsed laser deposition (PLD) using a 248-nm KrF excimer laser. Process parameters were varied during the growth process and the effect on the surface morphology and cathodoluminescence (CL) was analysed. The process parameters that were changed included the following: gas pressure (vacuum (5×10⁻⁶ Torr), 1×1⁻² Torr and 1 Torr O₂), different gas species (O₂, Ar and N₂ at a pressure of 455 mTorr), laser fluence (1.6±0.1 J cm⁻² and 3.0±0.3 J cm⁻²) and substrate temperature (400 and 600°C). The surface morphology was investigated with atomic force microscopy (AFM). The morphology of the thin films ablated in vacuum and 10 mTorr ambient O₂ showed more or less the same trend. An increase in the pressure to 1 Torr O₂, however, showed a definite increase in deposited particle sizes. Ablation in N₂ gas resulted in small particles of 20 nm in diameter and ablation in O₂ gas produced bigger particles of 20, 30 and 40 nm as well as an agglomeration of these particles into bigger size clusters of 80 to 100 nm. Ablation in Ar gas led to particle sizes of 30 nm and the particles were much more spherically defined and evenly distributed on the surface. The higher fluence deposition led to bigger particle and grain sizes as well as thicker layers with respect to the lower fluence. The particle sizes of the higher fluence vary mainly between 130 and 140 nm and the lower fluence sizes vary between 50 and 60 nm. The higher fluence particles consist of smaller particles ranging from 5 to 30 nm as measured with AFM. The surface structure of the thin film ablated at 400°C substrate temperature is less compact (lesser agglomeration of particles than at 600°C). The increase in substrate temperature definitely resulted in a rougher surface layer. CL was measured to investigate the effect of the surface morphology on the luminescent intensities. The increased O₂ ambient (1 Torr) resulted in a higher CL intensity compared to the thin films ablated in vacuum. The thin film ablated in Ar gas showed a much higher CL intensity than the other thin films. Ablation at a high fluence resulted in a higher CL intensity. The higher substrate temperature resulted in better CL intensities. The more spherically shaped particles and rougher surface led to increase CL intensities.     

Sensitive Chemiluminescence Assay for Patulin in Apple Juice by Flow Injection

Abstract

A sensitive chemiluminescence (CL) procedure for the determination of patulin by flow injection is described. It was found that patulin inhibits the CL generated from the luminol–dissolved oxygen system significantly. The decrement of chemiluminescence intensity was linear with the patulin concentration over the range from 0.04 to 10.0 ng mL^?1 with a detection limit of 0.01 ng mL^?1 (3σ_noise). At a flow rate of 2.0 mL min^?1, a complete analytical process could be performed within 0.5 min, including sampling and washing, with a relative standard deviation of less than 3.0% (n=5). The proposed method was applied successfully in the determination of patulin in apple juice, and the recovery was between 96.9% and 103.9%.     

A Sensitive Chemiluminescence Flow Injection Procedure for Assay of Fluoride in Waters and Humane Urine by Use of Immobilized Reagents

A new simple, rapid, selective and sensitive analytical procedure based on chemiluminescence (CL) detection is described for the determination of free fluoride at sub‐nanogram levels by use of controlled‐reagent‐release technology in a flow injection system. The analytical reagents involved in the CL reaction, including luminol and periodate, were both immobilized on anion‐exchange resins in a flow injection system. Through water injection luminol and periodate were eluted from the anion exchange column to generate the chemiluminescence, which was enhanced in the presence of fluoride. The increased CL intensity was linear with fluoride concentration in the range from 0.1 to 10 ng·mL^? 1. The limit of detection was 20 pg·mL^? 1 (3σ) and the relative standard deviation (RSD) was 1.02% (n = 5) for a 1.0 ng·mL^? 1 fluoride. At a flow rate of 2.0 mL·min^? 1, including sampling and washing, a typical analytical procedure could be performed in 0.5 min with a RSD of less than 3.0%. The proposed method was successfully applied to determine the free fluoride in water and human urine, and the results were in good agreement with those obtained by ion chromatography.     

化学发光在免疫学研究中的应用

化学发光测定(chemiluminescence,CL)是近年来的新技术之一,正当前的医学、生物学和生物化学中已成为一个重要研究手段。CL在免疫学研究中的应用主要有两方面:1.白细胞的功能测定。白细胞接到外来刺激时,氧化代谢增强,产生氧化代谢中间产物,由此产生光反应。根据光反应出现的速度和强度,可测知血清的调理功能和白细胞的氧化代谢功能。临床上用于某些免疫缺陷病的诊断、患者白细胞免疫水平的检测及临床监护。此外亦应用于免疫病理学和基础免疫学的研究。2.发光免疫测定,用luminol或过氧化物酶标记抗原或抗体,采用固相或双抗沉淀技术,可用来检测微量抗原。因为发光免疫测定兼有CL反应的快速性、高度敏感性和免疫反应的专一性等特点,在微量抗原的定量检测中有广泛的应用前景。     

Ultrasound-enhanced chemiluminescence tomography in biological tissue

This paper reports ultrasound-assisted optical imaging of chemiluminescent probes in biological tissue. A focused low power ultrasound sonochemically enhances a peroxyoxalate chemiluminescence (CL) that involves indocyanine green (ICG) as luminescent pigments. By scanning the focus, it produces tomographic images of CL in scattering media. The authors demonstrate imaging using a slab of porcine muscle measuring 50 × 50 × 75 mm, in which a capsuled CL reagent is embedded at 25 mm depth. Spatial resolution of imaging and concentration characteristics of CL reagents to enhanced CL intensity are also studied to evaluate the potential for use in bio-imaging applications with exploring the CL enhancement mechanisms. CL enhancement ratio, defined as the ratio of ultrasonically enhanced CL intensity to the base intensity without ultrasound irradiation, was found to be constant even in varying ICG and oxidizer concentrations, implying to be applicable for quantitative determination of these molecules.