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Renewable-surface graphite–ceramic enzyme sensors for the determination of hypoxanthine in fish meat 可再生表面石墨陶瓷酶传感器测定鱼肉中的次黄嘌呤
Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A900896I
J. Niu, J. Lee
{"title":"Renewable-surface graphite–ceramic enzyme sensors for the determination of hypoxanthine in fish meat","authors":"J. Niu, J. Lee","doi":"10.1039/A900896I","DOIUrl":"https://doi.org/10.1039/A900896I","url":null,"abstract":"Sol–gel processes were used to fabricate amperometric biosensors that are active for hypoxanthine (Hx) determination. Xanthine oxidase was immobilized in the bulk of the silica–graphite matrix (SGM) to produce electrodes where new surfaces can be generated on demand by mechanical polishing. The immobilized enzyme electrodes can be used in unmediated hydrogen peroxide oxidation mode, or in unmediated and mediated oxygen reduction mode, to result in three different types of Hx biosensors with detection limits of 1.3 × 10–6, 5.6 × 10–6 and 3.8 × 10–7M, respectively. Benzyl viologen was used as the charge transfer mediator to enhance the response in the hydrogen peroxide production mode. The sensors show good linear response over a wide range of concentrations of about 1 × 10–6–1 × 10–3M. The use of bulk immobilization and the possibility of renewable surfaces have enabled the easy operation of these sensors with high stability. The experimental results from a carp sample stored under different conditions demonstrate the practicality of these sensors as simple, rapid and cost effective measurement of fish meat freshness.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"11 1","pages":"81-83"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80791740","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: 32
High-performance chelation ion chromatography of transition and heavy metal ions on polystyrene–divinylbenzene resin dynamically modified with 4-chlorodipicolinic acid 4-氯二吡啶酸动态改性聚苯乙烯-二乙烯苯树脂上过渡离子和重金属离子的高效螯合离子色谱
Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A908318I
M. J. Shaw, S. Hill, Phil Jones, P. Nesterenko
{"title":"High-performance chelation ion chromatography of transition and heavy metal ions on polystyrene–divinylbenzene resin dynamically modified with 4-chlorodipicolinic acid","authors":"M. J. Shaw, S. Hill, Phil Jones, P. Nesterenko","doi":"10.1039/A908318I","DOIUrl":"https://doi.org/10.1039/A908318I","url":null,"abstract":"A neutral polystyrene–divinylbenzene column, combined with 4-chlorodipicolinic acid present in the mobile phase, has been developed as a chromatographic system for the high efficiency isocratic separation of transition and heavy metal ions. Retention arises from the formation of a stable dynamically coated chelating stationary phase, the capacity of which is dependent upon both the pH and ligand concentration in the eluent. The results obtained illustrate the increased loading and selectivity of this chlorinated chelating molecule in comparison with unsubstituted dipicolinic acid, exemplified by the separation of 7 metals in under 8 min. The column also displayed a strong affinity for CdII and an unusual retention for NiII, which showed a good symmetrical peak shape.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"32 1","pages":"399-401"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76457896","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
FTIR spectroscopic assessment of water structure in human breast benign and malignant tissues 人乳腺良性和恶性组织中水结构的FTIR光谱评价
Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A905147C
Tiyu Gao, Y. Ci
{"title":"FTIR spectroscopic assessment of water structure in human breast benign and malignant tissues","authors":"Tiyu Gao, Y. Ci","doi":"10.1039/A905147C","DOIUrl":"https://doi.org/10.1039/A905147C","url":null,"abstract":"Considerable compositional differences of water, nucleic acids and proteins were observed between benign and malignant breast tissues based on the curve-fitting analysis of the infrared absorption band in the frequency region 3100–3600 cm–1. Compared to normal tissue, the tendency of an increase in the proportions of strongly H-bonded water (ASBW) with biomolecules and a decrease in that of weakly H-bonded water (AWBW) was observed in abnormal tissues. Subsequently, ASBW/AWBW ratios dramatically increased. The proportions of nucleic acid–NH2 groups (ANA) and the proportions of protein N–H groups (APR) in abnormal tissues increased from those of normal tissue. The ratios ANA/APR in fibroadenoma and carcinoma tissues are higher than those in normal and hyperplasia tissues whose ANA/APR ratios are located in the same region. The ANA and ANA/APR in carcinoma tissue are the highest. These differences may be related to the cell proliferation in abnormal tissues and the unregulated growth and dedifferentiation of carcinoma cells.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"37 1","pages":"341-343"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81106359","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: 4
Preliminary study on fluorimetric detection of aflatoxins Q1, P1 and B1 using heptakis-di-O-methyl-β-cyclodextrin as post-column HPLC reagent 柱后高效液相色谱法检测黄曲霉毒素Q1、P1和B1的初步研究
Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A809150A
B. Vázquez, C. Fente, C. Franco, A. Cepeda, G. Mahuzier, P. Prognon
{"title":"Preliminary study on fluorimetric detection of aflatoxins Q1, P1 and B1 using heptakis-di-O-methyl-β-cyclodextrin as post-column HPLC reagent","authors":"B. Vázquez, C. Fente, C. Franco, A. Cepeda, G. Mahuzier, P. Prognon","doi":"10.1039/A809150A","DOIUrl":"https://doi.org/10.1039/A809150A","url":null,"abstract":"Post-column fluorimetric detection for the determination of aflatoxins Q1, P1 and B1 was carried out by using HPLC with a 2.0 mm id column. The post-column reagent consisted of a 10–2M aqueous solution of heptakis-di-O-methyl-β-cyclodextrin. The fluorescence enhancement achieved was 37- and 27-fold for AFQ1 and AFB1, respectively, whereas the AFP1 signal was increased just about 2-fold. With the proposed method, aflatoxins Q1, P1 and B1 can be simultaneously determined in human urine. The detection limits (S/N = 3) were as follows: 0.7 ng ml–1 for AFQ1, 0.5 ng ml–1 for AFP1 and 0.3 ng ml–1 for AFB1.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"69 1","pages":"5-7"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77808441","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: 19
Ceramic microchips for capillary electrophoresis–electrochemistry 毛细管电泳-电化学用陶瓷微芯片
Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A904807C
C. Henry, M. Zhong, S. Lunte, Moon Kim, H. Bau, J. Santiago
{"title":"Ceramic microchips for capillary electrophoresis–electrochemistry","authors":"C. Henry, M. Zhong, S. Lunte, Moon Kim, H. Bau, J. Santiago","doi":"10.1039/A904807C","DOIUrl":"https://doi.org/10.1039/A904807C","url":null,"abstract":"A capillary electrophoresis–electrochemistry chip constructed from low-temperature co-fired ceramic (LTCC) tape is presented. This is the first report of such a chip constructed in this manner using these materials. Electroosmotic flow at pH 7 is demonstrated by the migration of a neutral marker, catechol. The separation and detection of two phenolic compounds are presented.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"172 1","pages":"305-307"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84011638","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: 53
Liquid chromatography–mass spectrometric analysis of phenylurea herbicides and their degradation products using an atmospheric pressure ionization interface 常压电离界面液相色谱-质谱法分析苯脲类除草剂及其降解产物
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A709147H
T. Yarita, K. Sugino, T. Ihara, A. Nomura
{"title":"Liquid chromatography–mass spectrometric analysis of phenylurea herbicides and their degradation products using an atmospheric pressure ionization interface","authors":"T. Yarita, K. Sugino, T. Ihara, A. Nomura","doi":"10.1039/A709147H","DOIUrl":"https://doi.org/10.1039/A709147H","url":null,"abstract":"A method was developed for the determination of two phenylurea herbicides and their degradation products using liquid chromatography–atmospheric pressure chemical ionization (APCI)-mass spectrometry without any additives in the mobile phase. The APCI detection sensitivity of these compounds was maximized when the vaporizer temperature was set at 250 °C and a positive-ion detection mode was chosen. Under these conditions, the detection limits (S/N = 3) of these compounds in total-ion and selected-ion monitoring were 2.5–3.0 and 0.12–0.26 ng, respectively. In a biodegradability test on diuron, small quantities of degradation products could be determined by the proposed method.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"101 1","pages":"91-92"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75571507","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
Self-assembled silanes and the thiol functionalization of surfaces 自组装硅烷和表面的硫醇功能化
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A807021K
M. McGovern, M. Thompson
{"title":"Self-assembled silanes and the thiol functionalization of surfaces","authors":"M. McGovern, M. Thompson","doi":"10.1039/A807021K","DOIUrl":"https://doi.org/10.1039/A807021K","url":null,"abstract":"The relative thickness and coverage of the silanes, mercaptopropyltrimethoxysilane and 1-(trifluoroacetato-)-11-trichlorosilyl-undecane subsequent to reaction on silicon surfaces has been assessed by X-ray photoelectron spectroscopic analysis. Use of the probe, N-pentafluorophenyl-N′-iodoacetyl hydrazide, allows an estimation of the availability of thiol groups on the substrate surface following reaction in air and in O2-free conditions. Although the trimethoxysilane generates multilayer structures, it is only capable of attaching 3.5 times less probe than the fluorine-containing silane. The results of these experiments confirm that 1-(trifluoroacetato-)-11-trichlorosilyl-undecane is a much more effective linking agent for the immobilization of biomolecules to substrate surfaces.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"74 1","pages":"391-393"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74567751","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: 10
On-flow identification of metabolites of paracetamol from human urine using directly coupled CZE–NMR and CEC–NMR spectroscopy 用直接耦合cce - nmr和CEC-NMR谱分析人尿中扑热息痛代谢物的流动鉴定
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A803671C
K. Pusecker, J. Schewitz, P. Gfrörer, L. Tseng, K. Albert, E. Bayer, I. Wilson, N. J. Bailey, G. Scarfe, J. Nicholson, J. Lindon
{"title":"On-flow identification of metabolites of paracetamol from human urine using directly coupled CZE–NMR and CEC–NMR spectroscopy","authors":"K. Pusecker, J. Schewitz, P. Gfrörer, L. Tseng, K. Albert, E. Bayer, I. Wilson, N. J. Bailey, G. Scarfe, J. Nicholson, J. Lindon","doi":"10.1039/A803671C","DOIUrl":"https://doi.org/10.1039/A803671C","url":null,"abstract":"Direct NMR spectroscopic detection on-flow to capillary electrophoresis (CE) or capillary electrochromatography (CEC) was applied to the separation of metabolites of paracetamol from an extract of human urine. The detection and characterisation of the major metabolites, the glucuronide and sulfate conjugates of the drug as well as identification of the endogenous material hippurate was achieved. This demonstrates that NMR detection and identification of drug metabolites is possible with nanolitre volumes of analyte.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"232 1","pages":"213-215"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80132565","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: 38
Behaviour of selenium compounds in FI-HG-AAS 硒化合物在FI-HG-AAS中的行为
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A805575K
A. Chatterjee, K. Irgolic
{"title":"Behaviour of selenium compounds in FI-HG-AAS","authors":"A. Chatterjee, K. Irgolic","doi":"10.1039/A805575K","DOIUrl":"https://doi.org/10.1039/A805575K","url":null,"abstract":"The borohydride active volatile compound formation potential of twelve selenium compounds [selenous acid, selenic acid, selenocystine (Secys), selenohomocystine (Sehcys), selenomethionine (Semet), selenoethionine (Seet), trimethylselenonium iodide (TmSe), selenocystathionine (Secystha), selenocystamine (Secysta), selenourea (Seur), selenocholine (Sech), and dimethyl(3-amino-3- carboxy-1-propyl)selenonium iodide (DmpSe)] were investigated in a FI-HG system with different sodium borohydride concentrations (0.3% in 0.1% sodium hydroxide, and 0.5, 0.7, and 1.0% in 0.2% sodium hydroxide) in the presence of 3 M hydrochloric acid using an atomic absorption spectrometer as selenium-specific detector. Percentage recoveries with respect to selenous acid of selenic acid, Secys, Sehcys, Semet, Seet, TmSe, Secystha; Secysta, Seur, Sech, and DmpSe were 0, 10.3, 19.7, 23.5, 32.4, 13.7, 16.5, 16.5, 11.3, 5.6 and 7.7%, respectively in the presence of 0.3% borohydride stabilized with 0.1% sodium hydroxide. By multiplying the borohydride concentrations, percentage recoveries of TmSe, DmpSe, Sech, Sehcys and Secysta were elevated, whereas those of Semet, Seet and Seur were reduced. However, percentage recoveries of Secys and Secystha remained almost uniform within the entire borohydride range. TmSe exhibited a 105% recovery with respect to selenous acid at 1.0% borohydride concentration, whereas selenic acid was inert to borohydride active volatile compound formation.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"59 1","pages":"337-340"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85023938","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: 18
Comparison of three different microemulsion systems as the run buffer for the capillary electrophoretic separation of ketone test solutes 三种不同微乳液体系作为毛细管电泳分离酮类测试溶质的缓冲液的比较
Analytical Communications Pub Date : 1998-01-01 DOI: 10.1039/A804998J
H. Watarai, I. Takahashi
{"title":"Comparison of three different microemulsion systems as the run buffer for the capillary electrophoretic separation of ketone test solutes","authors":"H. Watarai, I. Takahashi","doi":"10.1039/A804998J","DOIUrl":"https://doi.org/10.1039/A804998J","url":null,"abstract":"Capillary electrophoretic behavior of ketones and β-diketones was examined using anionic, nonionic and cationic oil in water (o/w) microemulsions as separation media, containing naphthalene as a fluorophore for means of indirect fluorescence detection. The migration behavior was greatly dependent on the charge type of microemulsions as well as on the composition and pH. Among the systems examined, sodium dodecyl sulfate (SDS) microemulsions were the most advantageous because of the wider separation window, the higher dissolution capacity and the rapid distribution rate. Capacity factors of the solutes in the electrophoresis employing SDS microemulsions were correlated to the distribution and interfacial adsorption parameters determined in bulk two-phase systems.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"18 1","pages":"289-292"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85647181","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: 12
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