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Laser electrophoresis in surface electric double layer 表面双电层激光电泳
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A807555G
S. Semenov
{"title":"Laser electrophoresis in surface electric double layer","authors":"S. Semenov","doi":"10.1039/A807555G","DOIUrl":"https://doi.org/10.1039/A807555G","url":null,"abstract":"The dynamic scattering of laser light by dissolved charged macromolecules or suspended colloid particles in the surface potential well near the solid/liquid boundary is examined theoretically. This surface potential well is a combination of the long-range attraction potential of the electric double layer (EDL) and the short-range repulsion van der Waals potential. The frequency spectrum of the scattered light recorded in the heterodyne regime should contain peaks with the Doppler frequency shifts corresponding to the velocities of particle electrophoresis in the EDL. The wave reflected from the boundary surface may be used as the reference wave necessary in the heterodyne regime, and the intensity of the scattered wave collinear with the reflected wave should be recorded. Since field strengths in the EDL are about 105 V cm–1 such a method should have extremely high resolution. The case of the equilibrium reversible ‘partition’ of particles between the liquid film, where no force is present, and the surface layer is examined. In this case, the ‘partition coefficient’ defining the ratio of the bulk and surface fractions of particles may be about one, if the liquid film is thin enough (≈10–3 cm). Also, in this case, the integral frequency spectrum should contain the bulk part corresponding to the particle diffusion and the surface part with the Doppler peaks, where electrophoresis of particles should be seen.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"55 1","pages":"369-372"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86933478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Development and characterization of an integrated on-capillary tubular electrode for capillary electrophoresis/electrochemistry 毛细管电泳/电化学一体化管状电极的研制与表征
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A803356K
S. Lunte, M. Zhong
{"title":"Development and characterization of an integrated on-capillary tubular electrode for capillary electrophoresis/electrochemistry","authors":"S. Lunte, M. Zhong","doi":"10.1039/A803356K","DOIUrl":"https://doi.org/10.1039/A803356K","url":null,"abstract":"An integrated on-capillary electrochemical detector for capillary electrophoresis is described. It consists of a gold tube permanently fixed onto the end of a capillary. This detector configuration eliminates the need for micromanipulators for electrode alignment. The large surface area of the gold tubular electrode results in better sensitivity for PAD detection than is attainable with a gold wire electrode. Application of this detector to the determination of glucose in serum by CE–PAD is described.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"15 1","pages":"209-212"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87583314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Molecularly imprinted receptor having metalloporphyrin-based signaling binding site 具有金属卟啉信号结合位点的分子印迹受体
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A803404D
J. Matsui
{"title":"Molecularly imprinted receptor having metalloporphyrin-based signaling binding site","authors":"J. Matsui","doi":"10.1039/A803404D","DOIUrl":"https://doi.org/10.1039/A803404D","url":null,"abstract":"A molecularly imprinted polymer capable of spectroscopic change based upon molecular recognition was prepared using a metalloporphyrin-based functional monomer. The effectiveness of the metalloporphyrin functional monomer was demonstrated on molecular imprinting of a nucleobase derivative, 9-ethyladenine (9-EA). When the concentration of 9-EA was increased, the visible absorbance spectra of the polymer dispersed in chloroform showed a red shift and the degree of the shift was dependent upon the concentration change. This readable molecular recognition phenomenon suggests a potential application of the molecularly imprinted polymer as optical sensor materials.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"32 1","pages":"225-227"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91286876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 30
Molecularly imprinted polymer combinatorial libraries for multiple simultaneous chiral separations 用于多重同时手性分离的分子印迹聚合物组合文库
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A806195E
L. Sabourin, R. Ansell, K. Mosbach, I. Nicholls
{"title":"Molecularly imprinted polymer combinatorial libraries for multiple simultaneous chiral separations","authors":"L. Sabourin, R. Ansell, K. Mosbach, I. Nicholls","doi":"10.1039/A806195E","DOIUrl":"https://doi.org/10.1039/A806195E","url":null,"abstract":"We demonstrate that the ligand cross-reactivities of molecularly imprinted polymers can be beneficially employed for the simultaneous separation of different stereoisomeric structures. In this study, a limited molecularly imprinted polymer combinatorial library has been prepared and used for the simultaneous separation of a mixture of N-tert-butyloxycarbonyl-L-phenylalanine, N-tert-butyloxycarbonyl-D-phenylalanine, N-acetyl-L-phenylalaninyl-L-tryptophanyl methyl ester, N-acetyl-D-phenylalaninyl-D- tryptophanyl methyl ester, yohimbine and corynanthine.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"1 1","pages":"285-287"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78506005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
Determination of zirconium with Xylenol Orange by flow injection spectrophotometry: application to eluates from technetium-99m generators 二甲酚橙流动注射分光光度法测定锆:在锝-99m发生器洗脱液中的应用
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A708836A
K. Grudpan, Mayuree Utamong, C. Taylor
{"title":"Determination of zirconium with Xylenol Orange by flow injection spectrophotometry: application to eluates from technetium-99m generators","authors":"K. Grudpan, Mayuree Utamong, C. Taylor","doi":"10.1039/A708836A","DOIUrl":"https://doi.org/10.1039/A708836A","url":null,"abstract":"A procedure for the determination of zirconium using Xylenol Orange has been developed from a conventional spectrophotometric one. An acidic medium of sulfuric rather than perchloric acid has been adopted, to achieve a fast reaction rate and greater sensitivity. Under optimised conditions, calibrations were found to be linear over a range of at least up to 10 ppm of zirconium. The detection limit was found to be 0.08 ppm and precisions (RSDs) at the 1, 3 and 5 ppm levels were 2.3, 1.9 and 0.2%, respectively. The procedure has been shown to be free of interferences from species which are present in the eluate from a technetium-99m generator, and has been applied to the determination of zirconium in such an eluate.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"40 1","pages":"107-108"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74816044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Determination of phosphine by packed column gas chromatography with alkali flame ionisation detection 碱火焰电离填充柱气相色谱法测定磷化氢
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A801070F
M. Chughtai, J. Pridham
{"title":"Determination of phosphine by packed column gas chromatography with alkali flame ionisation detection","authors":"M. Chughtai, J. Pridham","doi":"10.1039/A801070F","DOIUrl":"https://doi.org/10.1039/A801070F","url":null,"abstract":"A method for the determination of phosphine using packed column isothermal gas chromatography has been developed and validated. The limit of detection is 0.01 ng ml–1 and response is linear over the ranges 0.1–1.0 and 2.5–25 ng ml–1. Reproducibility at 0.1 ng ml–1 was found to be 12.1% RSD. The method has been used to establish that phosphine is outgassed by newly fabricated semi-conductor devices containing phosphide compounds as dopants and is present in flatus of human origin.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"85 1","pages":"109-111"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79282075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Thermal degradation of ceramides as studied by mass spectrometry and vibrational spectroscopy 质谱法和振动光谱法研究神经酰胺的热降解
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A801326H
R. Neubert, K. Raith, Steve Raudenkolb, S. Wartewig
{"title":"Thermal degradation of ceramides as studied by mass spectrometry and vibrational spectroscopy","authors":"R. Neubert, K. Raith, Steve Raudenkolb, S. Wartewig","doi":"10.1039/A801326H","DOIUrl":"https://doi.org/10.1039/A801326H","url":null,"abstract":"The degradation of ceramides type IV induced by thermal treatment up to 140 °C was studied by using electrospray mass spectrometry, Fourier transform infrared photoacoustic spectroscopy and Fourier transform Raman spectrocopy. At temperatures above 125 °C structural changes such as cleavage of the CC bond, destruction of the amide structure and variations of the hydrogen bonds were observed in the head group of ceramides type IV. The mass spectrometry studies revealed the formation of free α-hydroxy fatty acids due to heat treatment. Degradation of ceramide III was not evident in the temperature range studied.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"42 1","pages":"161-164"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85402094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Electrochemical flow sensor for in-situ monitoring of total metal concentrations 用于现场监测总金属浓度的电化学流量传感器
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A803525C
Joseph Wang, B. Tian, Jianyang Wang
{"title":"Electrochemical flow sensor for in-situ monitoring of total metal concentrations","authors":"Joseph Wang, B. Tian, Jianyang Wang","doi":"10.1039/A803525C","DOIUrl":"https://doi.org/10.1039/A803525C","url":null,"abstract":"An electrochemically-based submersible probe for in-situ monitoring of the total content of dissolved metal species is described. The flow-through sensor relies on the coupling of an internal on-line acidification of the collected samples with potentiometric stripping detection of the metals released from their complexes. The optimisation and characterisation of the new remote sensor have been carried out with trace measurements of cadmium and lead in the presence of EDTA and NTA. Elevated levels of these ligands (e.g. 0.05 and 1.0 mM EDTA and NTA, respectively) had no effect upon the cadmium and lead peaks, as compared to the complete disappearance of the response without the internal acid delivery. Such real-time measurements of the total form of dissolved heavy metals hold great promise for environmental and industrial monitoring. Other in-situ speciation sensing schemes are anticipated based on the versatility of the renewable-reagent flow probe.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"102 1","pages":"241-243"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80630621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
New three-phase model for micellar liquid chromatography 胶束液相色谱的新三相模型
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A802244E
Wenzhi Hu, P. Haddad
{"title":"New three-phase model for micellar liquid chromatography","authors":"Wenzhi Hu, P. Haddad","doi":"10.1039/A802244E","DOIUrl":"https://doi.org/10.1039/A802244E","url":null,"abstract":"The amount of sodium dodecyl sulfate (SDS) adsorbed on a reversed-phase octadecylsilica (ODS) stationary phase in micellar liquid chromatographic (MLC) separation has been measured. It was found that the weight percentage of SDS on the stationary phase (16.5%) was similar to the percentage ratio of C/Si (C/Si = 17.1%) of the original ODS stationary phase. This indicated that the octadecyl groups of the ODS packing were largely covered by adsorbed surfactants and the stationary phase in the MLC system could be considered to be the adsorbed surfactant. Accordingly, a new three-phase equilibrium model in which the adsorbed surfactant was assumed to be the stationary phase was proposed to illustrate the behaviour of analyte partitioning in MLC. The negative impact of the adsorbed surfactant on the efficiency of MLC was discussed in terms of this new model. With the three-phase model, the equilibrium constant (K3) for direct transfer of the analyte from the surfactant in the mobile phase to the surfactant on the stationary phase could be calculated. The results obtained for K3 using two model analytes showed that the mobile phase and stationary phase portions of the surfactant in MLC had similar but not identical abilities for binding the analyte. The effects and limitations of the use of organic modifiers in MLC are also discussed.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"83 1","pages":"191-194"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80383591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Pulsed flow chemistry. A new approach to the generation of concentration profiles in flow analysis 脉冲流化学。流动分析中浓度曲线生成的新方法
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A708659H
X. D. Wang, T. Cardwell, R. Cattrall, G. E. Jenkins
{"title":"Pulsed flow chemistry. A new approach to the generation of concentration profiles in flow analysis","authors":"X. D. Wang, T. Cardwell, R. Cattrall, G. E. Jenkins","doi":"10.1039/A708659H","DOIUrl":"https://doi.org/10.1039/A708659H","url":null,"abstract":"Pulsed flow chemistry (PFC) is described as a new approach to automated on-line analytical chemistry. In contrast to existing flow-based analytical chemistry methods, PFC is characterized by pulsed flow, turbulent mixing and low axial dispersion. The PFC system is fully computerized and all operations are under software control. Consequently, most flow analysis methods (e.g., flow injection, continuous flow, flow titration, etc.) can be selected with a simple click of the mouse. The system is easily miniaturized and portable which makes it particularly suited to field instrumentation. The system has been tested using several flow-based techniques including on-line titration for the determination of calcium in waters with potentiometric detection and a calcium ion sensor.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"116 1","pages":"97-101"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87857572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
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