共查询到19条相似文献,搜索用时 78 毫秒
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毛细管电泳电化学检测单糖的研究 总被引:4,自引:0,他引:4
采用毛细管区带电泳直立式安培电化学检测方法分离和测定单糖。考察了电解质溶液的PH和浓度对单糖分离的影响,适量加入氯化钠可改善分离条件。应用该法进行了乳糖的组成和人血中葡萄糖的测定。 相似文献
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高效毛细管电泳—电化学法检测烟酰胺腺嘌呤二核苷酸 总被引:2,自引:0,他引:2
报道了一种测定烟酰胺腺嘌呤二核苷酸的毛细管电泳电化学检测方法。采用30cm×25μm的石英毛细管分离NADH与脲酸,以微型碳糊电极测定经分离后的NADH的含量。在pH7.5的磷酸盐缓冲溶液中,标准工作曲线的范围为1.0-100μmol/L;最代检测浓度为0.60μmol/L。 相似文献
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在PDMS微管道集成电化学检测系统中,利用集成的三维调节精确准直定位装置,以直径为150μm的铜圆盘电极,采用柱端检测模式,构建了PDMS微管道-安培检测平台,解决了由于PDMS管道几何位置易变造成的准直问题.应用该系统分离检测了精氨酸和组氨酸,结果令人满意. 相似文献
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首次采用毛细管电泳—电化学检测法(CE-ED)同时测定山楂中的6种活性成分:表儿茶素,山奈酚,氯原酸,4-羟基苯甲酸,槲皮素和原儿茶酸的含量。考察了缓冲液酸度和浓度、检测电位、分离电压和进样时间等实验参数对分离检测的影响。在最佳实验条件下,工作电极为直径300µm的碳圆盘电极,检测电位为+0.95V(vs. SCE), 缓冲液为60mmol/L 硼砂—硼酸溶液(pH=8.7),
分离电压16kV,上述六组分在21 min 内即可实现分离。六种组分在三个数量级的范围内呈良好线性关系,检测下限(S/N=3)范围为3.0×10-8g mL-1 至2.0×10-7g mL-1。该方法已成功地应用于实际样品分析,结果令人满意。 相似文献
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提出了基于毛细管电泳芯片的电化学和电化学发光同时检测技术.在此芯片系统中,三联吡啶钌Ru(bpy)32+[Tris(2,2'-bypiridyl) ruthenium(Ⅱ)]既作为电化学发光(ECL)检测所需的发光试剂与被分析物反应,生成激发态的Ru(bpy)32+*,从而产生电化学发光信号;又具有催化作用参与电极表面的电化学反应,从而得到增强的电流响应.电化学信号与电化学发光信号同时产生并被分别纪录,从而实现了电化学和电化学发光的同时检测.这种芯片由两部分构成,分别是带有分离和进样通道的聚二甲基硅氧烷(PDMS)层和ITO(Indium tin oxide)工作电极底片.PDMS层与ITO电极底片采用可逆键合的方式组成芯片,该芯片大大简化了操作过程,提髙了发光信号的采集效率.在整个实验过程中,ITO电极表现出良好的稳定性,可长时间多次使用.选用山莨菪碱和氧氟沙星两种药物分子作为被分析物,对芯片系统性能进行了表征. 相似文献
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毛细管电泳安培型电化学检测法 总被引:2,自引:0,他引:2
本文评述了近年来安培型电化学检测法在毛细管电泳中的发展概况,归纳了二种检测方式及其装置的结构特点。阐述了金属电极、液膜电极和修饰电极等在电化学检测应用研究中的作用以及此方法在微区分析、活体分析中的重要意义,并展望了其发展前景。 相似文献
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Methamphetamine and amphetamine are well-known illicit drugs that have'a potent central nervous system stimulating effect. It is reported that methamphetamine is more addictive than heroin. The abuse of amphetamine and methamphetamine is increasing because they can be easily manufactured. There have been increasing interested in the development of analysis methods for methamphetamine and amphetamine. The determination of methamphetamine and amphetamine by gas chromatography (GC),GC-mass spectrometry (GC-MS), polarization fluoroimmunometry and high-performance liquid chromatography (HPLC) have been reported. Recently, Kuroda and Trenerry have reported the separation of these two compounds by CE. 相似文献
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沙棘黄酮口服液中芦丁和5-羟色胺的毛细管区带电泳电化学检测 总被引:6,自引:0,他引:6
建立了毛细管区带电泳 -电化学检测法 (CE -ED)测定芦丁和5_羟色胺含量的方法 ,研究了电极电位、运行缓冲液的酸度和浓度、电泳电压及进样时间等因素对分离检测的影响,确定了最佳测定条件 ;以直径为300μm的碳圆盘电极为检测电极,电极电位为0.90V(vsSCE),在50mmol/L硼酸盐缓冲液(pH8.5)中,上述2组分在12min内完全分离 ,被分析物的电流响应与浓度在约3个数量级范围内呈良好线性关系,检出限分别为3×10-7 mol/L和8×10-8 mol/L ,7次测定含5.0×10-4 mol/L的芦丁和5_羟色胺的标准溶液,峰高的相对标准偏差分别为2.5 %和3.8 % ;该法成功地用于中药沙棘黄酮口服液中芦丁和5_羟色胺的测定 相似文献
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A sensitive, simple and low-cost method based on capillary electrophoresis(CE) with electrochemical(EC) detection at a carbon fiber microdisk electrode(CFE) was developed for the determination of nicotine. Effects of detection potential, concentration and pH value of the phosphate buffer, and injection time as well as separation voltage were investigated. Under the optimized conditions: a detection potential of 1.20 V, 40 mmol/L phosphate buffer(pH 2.0), a sample injection time of 10 s at 10 kV and a separation voltage of 16 kV, the linear range obtained was from 5.0×10-7 mol/L to 1.0×10-4 mol/L with a correlation coefficient of 0.9989 and the limit of detection(LOD, S/N=3) obtained was 5.0×10-8 mol/L. The method was also used to determine the nicotine in cigarettes. Nicotine amount ranged from 0.211 mg/g to 0.583 mg/g in the pipe tobacco of seven brands of cigarette and the amount in one cigarette varied from 0.136 mg/cigarette to 0.428 mg/cigarette. 相似文献
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《Electroanalysis》2005,17(3):223-230
There is a need to develop analytical methods that are capable of rapidly measuring small biological markers in the field of metabolomics. Among others, carbohydrates play an important role biologically yet are traditionally hard to detect since they have no chromophore or fluorophore. In the present report, the first application of integrated pulsed amperometric detection (iPAD) coupled with microchip electrophoresis to the analysis of glucose, mannose, sucrose, maltose, glucosamine, lactose, maltotriose and galactose is demonstrated. iPAD is an electrochemical detection mode that can be used for direct detection of carbohydrates, amines and sulfur containing compounds. The effect of different solution parameters, including the buffer concentration, pH and the concentration of SDS on both separation and detection response was analyzed. In addition, a comparison study between PAD and iPAD was performed using glucose, glucosamine, sucrose and maltose as model carbohydrates. 相似文献
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毛细管电泳-电化学发光法检测淮山中乐果的残留量 总被引:1,自引:0,他引:1
《分析科学学报》2015,(6)
采用毛细管电泳-电化学发光(CE-ECL)法检测淮山中乐果的残留量。考察了检测电位、缓冲液浓度及其pH值、分离电压、进样电压和时间等实验参数对测定乐果的影响。在优化的实验条件下,乐果在0.50~10 000μg/L范围内与ECL强度呈良好线性,检出限为0.050μg/L。对0.500mg/L乐果溶液连续6次测定,峰高的相对标准偏差(RSD)为1.8%,迁移时间的RSD为1.0%。该方法用于淮山中乐果残留量的测定,加标回收率在98.3%~103.0%之间,RSD≤2.3%。 相似文献
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高效毛细管电泳安培法测定芦荟中芦荟苷的含量 总被引:1,自引:0,他引:1
建立了芦荟中芦荟苷含量的高效毛细管电泳安培检测方法. 探讨了缓冲溶液种类、浓度、酸碱度,工作电位,有机改性剂及其操作电压、进样时间等对检测的影响. Na2B4O7-NaOH(Na2B4O7浓度为30 mmol/L)为缓冲液,工作电位为-0.8 V,体积分数为2.5%甲醇为有机添加剂,进样时间为10 s,在15 kV分离高压,pH=9.5的碱性条件下柱端安培法检测了芦荟苷的含量. 该法的线性范围为50~0.05 mg/L,线性方程Y=856.2+123.3c,相关系数r=0.999 4,检出限为0.01 mg/L. 相似文献
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A method based on capillary electrophoresis with electrochemical detection has been developed for the separa-tion and determination of epicatechin,kaempferol,chlorogenic acid,4-hydroxybenzoic acid,quercetin and proto-catechuic acid in hawthorn for the first time.The effects of working electrode potential,pH and concentration ofrunning buffer,separation voltage and injection time on CE-ED were investigated.Under the optimum conditions,the analytes could be separated in a 60 mmol·L~(-1) borate buffer(pH 8.7)within 21 min.A 300 μm diameter carbondisk electrode has a good response at 0.95 V(vs.SCE)for all analytes.The response was linear over three ordersof magnitude with detection limits(S/N=3)ranging from 3×10~(-8) to 2×10~(-7) g·mL~(-1) for the analytes.The methodhas been successfully applied to the analysis of real sample,with satisfactory results. 相似文献
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中药菟丝子中生物活性成分的毛细管电泳-电化学检测 总被引:6,自引:0,他引:6
采用毛细管电泳-电化学检测法(CE-ECD)同时测定了菟丝子中芦丁、金丝桃甙、山柰酚、对香豆酸和槲皮素等5种主要生物活性成分的含量,考察了运行缓冲液酸度和浓度、分离电压、氧化电位和进样时间等实验参数对分离检测的影响。在最佳实验条件下,以直径300 μm的碳圆盘电极为工作电极,检测电位为+950 mV(vs. 参比电极),以50 mmol/L的硼砂缓冲溶液(pH 9.0)为运行缓冲液,上述各组分在19 min内能完全分离。芦丁、金丝桃甙、山柰酚、对香豆酸和槲皮素在两个数量级的范围内呈良好线性关系,检测下限(按S/N=3计) 分别为1.93×10-5,3.55×10-4,3.65×10-5,1.73×10-5和1.46×10-4 g/L。该法已成功地应用于菟丝子中活性成分的分离检测,结果令人满意。 相似文献