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González-Gómez D, Cañada-Cañada F, Campiglia AD, Espinosa-Mansilla A, Muñoz de la Peña A, Jeong JS. Rapid ultrasensitive chemometrics-fluorescence methodology to quantify fluoroquinolones antibiotics residues in surface water. J WATER CHEM TECHNO+ 2016. [DOI: 10.3103/s1063455x16050064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Culzoni M, Muñoz de la Peña A, Machuca A, Goicoechea H, Brasca R, Babiano R. Photoinduced electron transfer fluorometric Hg(II) chemosensor based on a BODIPY armed with a tetrapod receptor. Talanta 2013; 117:288-96. [DOI: 10.1016/j.talanta.2013.09.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Revised: 09/02/2013] [Accepted: 09/05/2013] [Indexed: 10/26/2022]
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Culzoni M, Mancha de Llanos A, De Zan M, Espinosa-Mansilla A, Cañada-Cañada F, Muñoz de la Peña A, Goicoechea H. Enhanced MCR-ALS modeling of HPLC with fast scan fluorimetric detection second-order data for quantitation of metabolic disorder marker pteridines in urine. Talanta 2011; 85:2368-74. [DOI: 10.1016/j.talanta.2011.07.086] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Revised: 07/11/2011] [Accepted: 07/23/2011] [Indexed: 11/30/2022]
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Merás ID, Muñoz de la Peña A, Acedo-Valenzuela MI, Jiménez Girón A. Stopped-flow and kinetic-fluorimetric determination of quinalphos in water samples. Talanta 2009; 69:397-402. [PMID: 18970580 DOI: 10.1016/j.talanta.2005.08.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2005] [Revised: 07/05/2005] [Accepted: 08/04/2005] [Indexed: 10/25/2022]
Abstract
The hydrolysis of the pesticide quinalphos in basic medium was kinetically followed and the measurement of the reaction rates allowed us to develop two kinetic-fluorimetric methods. In one of them the mixing of the reagents was directly performed in the measurement cell and, in the another one, the stopped-flow mixing technique was used. The reaction was completed in 100 s after the reactants were mixed and it allowed the simple application of the proposed methods to routine analyses of the pesticide. The sensitivity of the methods was very high, being the detection limits 50 and 140 ng mL(-1) for the manual procedure and the stopped-flow mixing technique, respectively. Both methods were compared using regression with uncertainties in both axes. The effect of the presence of several pesticides in the determination was tested. A solid-phase extraction process was also developed for the application of the methods to diverse waters samples. The proposed kinetic-fluorimetric methods were applied to the determination of quinalphos in drinking water, well water and river water, with very satisfactory results.
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Affiliation(s)
- I Duran Merás
- Department of Analytical Chemistry, University of Extremadura, Badajoz, Spain.
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Cañada-Cañada F, Muñoz de la Peña A, Espinosa-Mansilla A. Analysis of antibiotics in fish samples. Anal Bioanal Chem 2009; 395:987-1008. [DOI: 10.1007/s00216-009-2872-z] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Revised: 05/21/2009] [Accepted: 05/26/2009] [Indexed: 10/20/2022]
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Cañada-Cañada F, Arancibia J, Escandar G, Ibañez G, Espinosa Mansilla A, Muñoz de la Peña A, Olivieri A. Second-order multivariate calibration procedures applied to high-performance liquid chromatography coupled to fast-scanning fluorescence detection for the determination of fluoroquinolones. J Chromatogr A 2009; 1216:4868-76. [DOI: 10.1016/j.chroma.2009.04.033] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2008] [Revised: 03/26/2009] [Accepted: 04/09/2009] [Indexed: 11/16/2022]
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Jiménez Girón A, Durán-Merás I, Espinosa-Mansilla A, Muñoz de la Peña A, Cañada Cañada F, Olivieri A. On line photochemically induced excitation–emission-kinetic four-way data. Anal Chim Acta 2008; 622:94-103. [DOI: 10.1016/j.aca.2008.05.079] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2008] [Accepted: 05/27/2008] [Indexed: 10/22/2022]
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Jiménez Girón A, Durán Merás I, Muñoz de la Peña A, Espinosa Mansilla A, Cañada Cañada F, Olivieri AC. Photoinduced fluorimetric determination of folic acid and 5-methyltetrahydrofolic acid in serum using the kinetic evolution of the emission spectra accomplished with multivariate second-order calibration methods. Anal Bioanal Chem 2008; 391:827-35. [DOI: 10.1007/s00216-008-1840-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2007] [Revised: 12/20/2007] [Accepted: 01/08/2008] [Indexed: 10/22/2022]
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Murillo JA, Alañón Molina A, Muñoz de la Peña A, Durán Merás I, Jiménez Girón A. Resolution of Ofloxacin–Ciprofloxacin and Ofloxacin–Norfloxacin Binary Mixtures by Flow-Injection Chemiluminescence in Combination with Partial Least Squares Multivariate Calibration. J Fluoresc 2007; 17:481-91. [PMID: 17577647 DOI: 10.1007/s10895-007-0198-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2007] [Accepted: 05/03/2007] [Indexed: 11/29/2022]
Abstract
A flow-injection chemiluminescence (CL) method is described for the determination of ciprofloxacin (CIP), norfloxacin (NOR) and ofloxacin (OFL), commonly used antibiotics of the fluoroquinolones family. The method is based on the CL reaction of the fluoroquinolones with tris(2,2'-bipyridyl) ruthenium(II) and Ce (IV), in sulfuric acid medium. The maximum CL emission, given at 0.45 min for CIP, at 0.35 min for NOR and at 0.04 min for OFL, respectively, were measured, allowing the simple application of the proposed method to the routine analysis of the antibiotics. The methods were applied to the determination of CIP, NOR and OFL, in several pharmaceutical preparations, with very satisfactory results, and validated by a previously reported HPLC method. The time-resolved equipment allowed the measurement of the kinetic evolution of the chemiluminescence signals. In base to the differences in the kinetic behaviour of ofloxacin with respect to ciprofloxacin and norfloxacin, binary mixtures of the drugs were resolved by using the time-resolved chemiluminescence signals, in combination with first-order partial least-squares (PLS) multivariate calibration.
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Affiliation(s)
- J A Murillo
- Department of Analytical Chemistry and Foods Technology, University of Castilla-La Mancha, 13071 Ciudad Real, Spain
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Muñoz de la Peña A, Mora Diez N, Mahedero García MC, Bohoyo Gil D, Cañada-Cañada F. A chemometric sensor for determining sulphaguanidine residues in honey samples. Talanta 2007; 73:304-13. [PMID: 19073032 DOI: 10.1016/j.talanta.2007.03.047] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2006] [Revised: 03/22/2007] [Accepted: 03/23/2007] [Indexed: 11/30/2022]
Abstract
The inclusion complex of sulphaguanidine (SGN) in beta-cyclodextrin has been investigated. To avoid the problem of the low solubility of beta-cyclodextrin in water, solutions of beta-cyclodextrin in urea have been used. A 1:1 stoichiometry and an association constant of 450M(-1) have been established for the complex. A new spectrofluorimetric method has been developed for the determination of SGN residues in honey samples. This sulphonamide is widely employed for honey treatment. The method for the determination is based on second-order multivariate calibration, applying parallel factor analysis (PARAFAC). No previous separation or samples pre-treatment were required. The calibration solutions were prepared in water, with concentrations in the range from 0.02 to 0.20mugmL(-1) for SGN. The use of the second-order calibration method in the standard addition mode, using the excitation-emission matrices (EEMs) as analytical signal, allowed its determination in honey samples, even in the presence of interferences, with satisfactory results. The proposed procedure was validated by comparing the obtained results with a HPLC method, with satisfactory results for the assayed method.
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Affiliation(s)
- A Muñoz de la Peña
- Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, 06071 Badajoz, Spain
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Diez NM, de la Peña AM, García MCM, Gil DB, Cañada-Cañada F. Fluorimetric Determination of Sulphaguanidine and Sulphamethoxazole by Host-Guest Complexation in β-Cyclodextrin and Partial Least Squares Calibration. J Fluoresc 2007; 17:309-18. [PMID: 17393284 DOI: 10.1007/s10895-007-0174-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2006] [Accepted: 02/22/2007] [Indexed: 11/25/2022]
Abstract
The host-guest inclusion complexes of sulphamethoxazole (SMTX) and sulphaguanidine (SGN) with beta-cyclodextrin, in aqueous solutions, have been investigated. A 1:1 stoichiometry of the complexes was established, the association constants were calculated by different methods, and the influence of several chemical variables on the complexation processes were established. According to the results obtained, a spectrofluorimetric method for the determination of these sulphonamides has been proposed. The individual and binary mixtures of both sulphonamides have been determined in human urine samples, at representative therapeutic ranges, by application of a first-order multivariate calibration partial least squares (PLS-1) model. The calibration set was designed with 9 samples, containing different concentrations of the two sulphonamides, and 8 blank urine samples, with the aim of modelling the variability of the background. The concentration ranges for the sulphonamides were up to 0.5 microg mL(-1) for SMTX and 1.0 microg mL(-1) for SGN. Figures of merit as selectivity, analytical sensitivity and limit of detection (LOD) were also calculated. The proposed procedure was validated by comparing the obtained results with a HPLC method, with satisfactory results for the assayed method.
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Affiliation(s)
- N Mora Diez
- Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, 06071 Badajoz, Spain.
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de la Peña AM, Mahedero MC, Bautista-Sánchez A. HOST-GUEST ROOM TEMPERATURE PHOSPHORESCENCE OF 1-NAPHTHALENACETIC ACID INCLUDED IN β-CYCLODEXTRIN IN PRESENCE OF 1,3-DIBROMOPROPANE. ANAL LETT 2007. [DOI: 10.1081/al-100107303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Muñoz de la Peña A, Durán Merás I, Jiménez Girón A. Four-way calibration applied to the simultaneous determination of folic acid and methotrexate in urine samples. Anal Bioanal Chem 2006; 385:1289-97. [PMID: 16685520 DOI: 10.1007/s00216-006-0408-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2005] [Revised: 02/15/2006] [Accepted: 03/06/2006] [Indexed: 11/29/2022]
Abstract
First-, second- and third-order calibration methods were investigated for the simultaneous determination of folic acid and methotrexate. The interest in the determination of these compounds is related to the fact that methotrexate inhibits the body's absorption of folic acid and prolonged treatment with methotrexate may lead to folic acid deficiency, and to the use of folic acid to cope with toxic side effects of methotrexate. Both analytes were converted into highly fluorescent compounds by oxidation with potassium permanganate, and the kinetics of the reaction was continuously monitored by recording the kinetics curves of fluorescence emission, the evolution with time of the emission spectra and the excitation-emission matrices (EEMs) of the samples at different reaction times. Direct determination of mixtures of both drugs in urine was accomplished on the basis of the evolution of the kinetics of EEMs by fluorescence measurements and four-way parallel-factor analysis (PARAFAC) or multiway partial least squares (N-PLS) chemometric calibration. The core consistency diagnostic (CORCONDIA) was employed to determine the correct number of factors in PARAFAC and the procedure converged to a choice of three factors, attributed to folic acid, methotrexate and to the sum of fluorescent species present in the urine.
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Affiliation(s)
- A Muñoz de la Peña
- Department of Analytical Chemistry, University of Extremadura, 06071, Badajoz, Spain.
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Muñoz de la Peña A, Mora Díez N, Bohoyo Gil D, Olivieri A, Escandar G. Simultaneous determination of flufenamic and meclofenamic acids in human urine samples by second-order multivariate parallel factor analysis (PARAFAC) calibration of micellar-enhanced excitation–emission fluorescence data. Anal Chim Acta 2006. [DOI: 10.1016/j.aca.2006.03.077] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Muñoz de la Peña A, Espinosa Mansilla A, Mora Díez N, Bohoyo Gil D, Olivieri AC, Escandar GM. Second-order calibration of excitation-emission matrix fluorescence spectra for the determination of N-phenylanthranilic acid derivatives. Appl Spectrosc 2006; 60:330-8. [PMID: 16608576 DOI: 10.1366/000370206776342643] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
A spectrofluorimetric method has been developed for the quantitative determination of mefenamic, flufenamic, and meclofenamic acids in urine samples. The method is based on second-order data multivariate calibration (unfolded partial least squares (unfolded-PLS), multi-way PLS (N-PLS), parallel factor analysis (PARAFAC), self-weighted alternating trilinear decomposition (SWATLD), and bilinear least squares (BLLS)). The analytes were extracted from the urine samples in chloroform prior to the determination. The chloroform extraction was optimized for each analyte, studying the agitation time and the extraction pH, and the optimum values were 10 minutes and pH 3.5, respectively. The concentration ranges in chloroform solution of each of the analytes, used to construct the calibration matrix, were selected in the ranges from 0.15 to 0.8 microg mL-1 for flufenamic and meclofenamic acids and from 0.25 to 3.0 microg mL-1 for mefenamic acid. The combination of chloroform extraction and second-order calibration methods, using the excitation-emission matrices (EEMs) of the three analytes as analytical signals, allowed their simultaneous determination in human urine samples, in the range of approximately 80 mg L-1 to 250 mg L-1, with satisfactory results for all the assayed methods. Improved results over unfolded-PLS and N-PLS were found with PARAFAC, SWATLD, and BLLS, methods that exploit the second-order advantage.
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Affiliation(s)
- A Muñoz de la Peña
- Departamento de Química Analítica, Facultad de Ciencias, Universidad de Extremadura, 06071, Badajoz, España.
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Espinosa-Mansilla A, Muñoz de la Peña A, Cañada-Cañada F, González Gómez D. Determinations of fluoroquinolones and nonsteroidal anti-inflammatory drugs in urine by extractive spectrophotometry and photoinduced spectrofluorimetry using multivariate calibration. Anal Biochem 2005; 347:275-86. [PMID: 16289005 DOI: 10.1016/j.ab.2005.09.032] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2005] [Revised: 09/21/2005] [Accepted: 09/22/2005] [Indexed: 11/18/2022]
Abstract
Multivariate calibration methods are chemometric tools that may be applied to the analysis of spectroscopic data with multichannel detection. Two procedures, based on spectrophotometric and fluorimetric signals, are reported for the simultaneous determination of two fluoroquinolones (ciprofloxacin and ofloxacin) and two nonsteroidal anti-inflammatory drugs (diclofenac and mefenamic acid) using first- and second-order multivariate calibration methods. In the spectrophotometric method, an extractive procedure into chloroform using trioctylmethylammonium chloride-adogen as counter ion was optimized, with the object of extracting the analytes from urine samples and eliminating matrix interferences. After separation, the absorption spectrum of the organic phase was used as the analytical signal in a partial least squares method. A photoinduced spectrofluorimetric (PIF) method using excitation-emission fluorescence matrices, is proposed, to apply three-way chemometric calibration, with the aim of analyzing ofloxacin, ciprofloxacin, and diclofenac in urine samples without the previous extractive sample-cleaning step. For both procedures, recoveries around 100% were found for all the analytes. However, the PIF three-way chemometric method provides the most sensitive and selective procedure as the urine interferences are modulated using the three-way chemometric technique.
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Affiliation(s)
- A Espinosa-Mansilla
- Department of Analytical Chemistry, University of Extremadura, Avda. Elvas s/n, 06071 Badajoz, Spain.
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Espinosa-Mansilla A, Peña AMDL, Gómez DG, Salinas F. HPLC determination of enoxacin, ciprofloxacin, norfloxacin and ofloxacin with photoinduced fluorimetric (PIF) detection and multiemission scanning. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 822:185-93. [PMID: 16006203 DOI: 10.1016/j.jchromb.2005.05.045] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2005] [Accepted: 05/13/2005] [Indexed: 11/26/2022]
Abstract
The fluorescence emission of the fluoroquinolones enoxacin (ENO), ciprofloxacin (CIPRO), norfloxacin (NOR) and ofloxacin (OFLO) notably increased by UV irradiation during few minutes, in ethanolic-water medium. An HPLC method has been developed, for the determination of these fluoroquinolones, based in the separation of the formed irradiation photoproducts. Optimization of the analytical wavelengths has been carried out by fast multiemission scanning fluorescence detection. The highest sensitivity has been found when measuring at emission wavelengths of 407 and 490 nm, for ENO and OFLO, respectively, and at 444 nm for both NOR and CIPRO (exciting at 277 nm). According to the criterium of Clayton, using 0.05 as false positive and false negative error assurance probabilities, detection limits of 7.3, 6.0, 6.3 and 14.5 ng/mL, for ENO, NOR, CIPRO and OFLO, respectively, have been found. Urine and serum samples have been successfully analyzed, with recovery values ranging among 99-97% and 98-103%, for urine and serum, respectively.
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Affiliation(s)
- A Espinosa-Mansilla
- Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, Campus Universitario, Avda. Elvas S/N Badajoz, 6071 Badajoz, Spain.
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Ibañez G, Escandar G, Mansilla AE, Peña AMDL. Determination of triamterene in pharmaceutical formulations and of triamterene and its main metabolite hydroxytriamterene sulfate in urine using solid-phase and aqueous solution luminescence. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2005.02.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Espinosa-Mansilla A, Peña AMDL, Gómez DG, Salinas F. Photoinduced spectrofluorimetric determination of fluoroquinolones in human urine by using three- and two-way spectroscopic data and multivariate calibration. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2004.10.039] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Escandar G, González Gómez D, Espinosa Mansilla A, Muñoz de la Peña A, Goicoechea H. Determination of carbamazepine in serum and pharmaceutical preparations using immobilization on a nylon support and fluorescence detection. Anal Chim Acta 2004. [DOI: 10.1016/j.aca.2003.11.014] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Muñoz de la Peña A, Mahedero MC, Bautista-Sánchez A. High-performance liquid chromatographic determination of phenylureas by photochemically-induced fluorescence detection. J Chromatogr A 2002; 950:287-91. [PMID: 11991003 DOI: 10.1016/s0021-9673(02)00042-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
A HPLC method, using photochemically-induced fluorescence detection, is described for the separation and determination of four phenylurea herbicides including diuron, isoproturon, linuron and neburon. A post-column photoreactor, consisting of a reactor knitted around a 4 W xenon lamp, has been included between the column and the detector, in order to transform the non-fluorescent herbicides into fluorophors. The influence of mobile phase composition, flow-rate, pH, and buffer concentration has been studied. An acetonitrile-buffer solution of potassium phosphate dibasic of pH 7 and 0.01 M concentration (60:40, v/v), was selected as optimum. For the fluorimetric detection, optimal excitation/emission wavelengths 324/403, 301/433, 335/411 and 326/385 nm were selected for the determination of diuron, isoproturon, linuron and neburon, respectively. The detection limits ranged between 0.07 and 0.46 microg/ml, according to the compound.
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Affiliation(s)
- A Muñoz de la Peña
- Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, Badajoz, Spain.
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Muñoz de la Peña A. Stopped-flow fluorimetric determination of amoxycillin and clavulanic acid by partial least-squares multivariate calibration. Talanta 2002; 56:635-42. [DOI: 10.1016/s0039-9140(01)00612-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2001] [Revised: 10/26/2001] [Accepted: 10/29/2001] [Indexed: 11/15/2022]
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Muñoz de la Peña A, Mahedero MC, Bautista Sánchez A. Room temperature phosphorescence in cyclodextrins. Analytical applications. ACTA ACUST UNITED AC 2000. [DOI: 10.1051/analusis:2000280670] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Durán Merás I, Muñoz de la Peña A, Salinas López F, Rodríguez Cáceres MI. Complexation of antibacterial quinolonic acid and cinolonic derivatives with Zn(II) and Al(III): application to their determination in human urine. Analyst 2000; 125:1471-6. [PMID: 11002930 DOI: 10.1039/b002512g] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nalidixic acid, 7-hydroxymethylnalidixic acid, oxolinic acid, pipemidic acid and cinoxacine form complexes with zinc(II) in the presence of acetate buffer of pH 5.5 and oxolinic acid, pipemidic acid and cinoxacine form complexes with aluminium(III) in the presence of chloroacetate buffer of pH 3.0. In all cases, an enhancement of the fluorescence emission was observed. Fluorimetric studies on the spectral characteristics of the complexes were performed. A 1:1 stoichiometry for all the complexes was established. The association constants were calculated, by using the changes in the fluorescence of all antibacterials, that occurred when the complexes were formed. The fluorescence reactions were used to develop methods for the determination of all of the above compounds, showing a higher sensitivity than in the absence of the cationic ions. The methods were satisfactorily applied to the determination of these compounds in urine.
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Affiliation(s)
- I Durán Merás
- Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, Badajoz, Spain.
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Muñoz de la Peña A, Pérez Rodríguez M, Escandar GM. Optimization of the room-temperature phosphorescence of the 6-bromo-2-naphthol-alpha-cyclodextrin system in aqueous solution. Talanta 2000; 51:949-955. [PMID: 18967926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/1999] [Revised: 11/25/1999] [Accepted: 12/10/1999] [Indexed: 05/27/2023]
Abstract
The influence of different factors on the room-temperature phosphorescence (RTP) emission from the inclusion complex between alpha-cyclodextrin (alpha-CD) and 6-bromo-2-naphthol (BN) was analyzed. Although RTP signals are detected even in aerated solutions, an efficient enhancement of the phosphorescence emission (about 13 times) is obtained when the solutions of the complex are deaerated with nitrogen bubbling, while quenching is produced when sodium sulfite is used for deoxygenation. Association constants of the 1:1 and 2:1 alpha-CD-BN complexes have been evaluated by molecular absorption and fluorimetric methods. Exciting at 287 nm, the RTP phosphorescence emission showed two maxima located at 500 and 535 nm and a shoulder at 577 nm. The RTP emission increases with the irradiation time of the sample by the xenon lamp of the fluorimeter, until it achieves a constant value after around 10 min of irradiation. The addition of organic molecules such as alcohols and bromoalcohols as a third component of the system produces an enhancement of the RTP emission smaller than that obtained in the absence of them. The calibration graph for BN was linear for the range of concentrations between 0.4 and 2.0 mug ml(-1) with a detection limit of 0.26 mug ml(-1), with relative standard deviation (RSD) (n=6) of 4%, for 1.6 mug ml(-1). The solution was transparent, and there was no precipitation.
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Affiliation(s)
- A Muñoz de la Peña
- Department of Analytical Chemistry, University of Extremadura, 06071 Badajoz, Spain
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Bautista A, Aaron JJ, Mahedero MC, Muñoz de la Peña A. Usefulness of micellar media for the quantitative analysis of phenylurea herbicides in water by
photochemically-induced fluorescence. ACTA ACUST UNITED AC 1999. [DOI: 10.1051/analusis:1999154] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Muñoz de la Peña A, Espinosa Mansilla A, Murillo Pulgarı́n J, Alañón Molina A, Fernández López P. Stopped-flow determination of dipyridamole in pharmaceutical preparations by micellar-stabilized room temperature phosphorescence. Talanta 1999; 48:1061-73. [DOI: 10.1016/s0039-9140(98)00315-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/1998] [Revised: 09/29/1998] [Accepted: 10/02/1998] [Indexed: 10/18/2022]
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Maafi M, Taha-Bouamri K, Bautista A, Aaron JJ, Mahedero MC, Peña AMDL, Salinas F. Analysis of phenylurea herbicides by photochemically induced fluorescence spectrometry. Biomed Chromatogr 1999. [DOI: 10.1002/(sici)1099-0801(199904)13:2<189::aid-bmc878>3.0.co;2-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Garrido Frenich A, Martı́nez Galera M, Gil Garcı́a M, Martı́nez Vidal J, Muñoz de la Peña A, Salinas F. Cross-sections of spectrochromatograms for the resolution of overlapping peaks in diode-array high-performance liquid-chromatography. Talanta 1998; 46:1329-40. [DOI: 10.1016/s0039-9140(97)00423-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/1997] [Revised: 11/28/1997] [Accepted: 12/02/1997] [Indexed: 11/17/2022]
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Murillo JA, Alañón A, Fernández P, Muñoz de la Peña A, Espinosa-Mansilla A. Simultaneous determination of nafcillin and methicillin by different fluorimetric techniques using partial least-squares calibration. Analyst 1998; 123:1073-7. [PMID: 9709491 DOI: 10.1039/a708001h] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The simultaneous determination of nafcillin and methicillin was accomplished by constant wavelength synchronous fluorimetry, in combination with partial least-squares multivariate calibration. The total luminescence information of the compounds was used to optimize the spectral data set to perform the calibration. A calibration set of standard samples was designed by combination of a factorial design, with three levels for each factor, and a central composite design. A comparative study of the results obtained using the excitation, the emission, the constant wavelength synchronous and the constant energy synchronous spectral data as analytical signals was performed. The data, set composed of the constant wavelength synchronous spectra, was selected as the analytical signal. The method was successfully applied to the determination of nafcillin and methicillin in mixtures.
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Affiliation(s)
- J A Murillo
- Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Ciudad Real, Spain
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Peña MS, de la Peña AM, Salinas F, Mahedero MC, Aaron JJ. Determination of binary mixtures of sulfonamides by photochemically induced fluorescence using partial least squares multivariate calibration. Analyst 1994. [DOI: 10.1039/an9941901177] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Espinosa-Mansilla A, Muñoz de la Peña A, Salinas F. Semiautomatic determination of furanic aldehydes in food and pharmaceutical samples by a stopped-flow injection analysis method. J AOAC Int 1993; 76:1255-61. [PMID: 8286965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A kinetic study of the reactions of 5-hydroxymethyl-2-furfuraldehyde and furfural with 2-thiobarbituric acid (TBA) by a stopped-flow flow injection analysis technique has been undertaken. A semiautomatic method for the analytical determination of these furanic aldehydes is proposed on the basis of reaction with TBA. The proposed stopped-flow method was successfully applied to several commercial pharmaceutical preparations and food samples. The procedure is faster than the earlier procedure for determination of these compounds in foods and pharmaceuticals.
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Affiliation(s)
- A Espinosa-Mansilla
- University of Extremadura, Department of Analytical Chemistry, Badajoz, Spain
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Espinos-Mansilla A, Muñoz de la Peña A, Salinas F, Martínez-Galera M. Simultaneous determination of 2-furfuraldehyde, 5-hydroxymethylfurfuraldehyde and malonaldehyde in mixtures by derivative spectrophotometry and partial least-squares analysis. Anal Chim Acta 1993. [DOI: 10.1016/0003-2670(93)85049-p] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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de la Peña AM, Pulgarin A. Analytical Chemistry in the EC. Research in Analytical Chemistry in Spain today, through an evaluation of the scientific literature. ACTA ACUST UNITED AC 1992. [DOI: 10.1039/ap9922900517] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Muñoz de la Peña A, Salinas F, Durán M. Simultaneous determination of propranolol and hydralazine by derivative synchronous spectrofluorimetry. Anal Chim Acta 1991. [DOI: 10.1016/0003-2670(91)80062-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Salinas F, Muñoz de la Peña A, Durán-Merás I, Soledad Durán M. Determination of salicylic acid and its metabolites in urine by derivative synchronous spectrofluorimetry. Analyst 1990; 115:1007-11. [PMID: 2221396 DOI: 10.1039/an9901501007] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The simultaneous determination of salicylic acid in binary and/or ternary mixtures and its two main urinary metabolites is proposed. Mixtures of salicylic, salicyluric and gentisic acids are resolved by synchronous spectrofluorimetry, in combination with first-derivative measurements. The urine is extracted with diethyl ether in acid medium. Salicylic and salicyluric acids are re-extracted into glycine-sodium hydroxide buffer solution of pH 11.6 and determined at that pH, and salicylic and gentisic acids are re-extracted into boric acid-sodium hydroxide buffer solution of pH 8.5 and determined at pH 6.
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Affiliation(s)
- F Salinas
- Department of Analytical Chemistry, University of Extremadura, Badajoz, Spain
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Salinas F, de la Peña AM, Merás ID. Analysis of Mixtures of Doxycycline and Oxytetracycline in Pharmaceutical Preparations by First Derivative Fluorimetry. ANAL LETT 1990. [DOI: 10.1080/00032719008052487] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Muñoz de la Peña A, Salinas F, Duràn Meràs I. Simultaneous determination of salicylic and salicyluric acids in urine by first-derivative synchronous fluorescence spectroscopy. Anal Chem 1988; 60:2493-6. [PMID: 3245586 DOI: 10.1021/ac00173a012] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Salinas F, Peña AMDL, Murillo JA. Spectrophotometric and First Derivative Spectrophotometric Determination of Magnesium with 1-Hydroxy-2-Carboxyanthraquinone. ANAL LETT 1986. [DOI: 10.1080/00032718608069111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Salinas F, de la Peña AM, de la Peña FM. Determination of magnesium by spectrofluorimetry and synchronous scanning first and second derivative spectrofluorimetry with 2-quinizarinsulphonate. Mikrochim Acta 1985. [DOI: 10.1007/bf01196835] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Salinas F, de la Peña AM, Murillo JA. Spectrofluorimetric determination of BrO 3 − by oxidation of 1,2,4-trihydroxyanthraquinone-3-carboxylic acid. Mikrochim Acta 1984. [DOI: 10.1007/bf01237262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Salinas F, de la Peña AM, Murillo JA. Spectrofluorimetric determination of aluminium(III) in Portland cement and aluminium bronze with 1-hydroxy-2-carboxyanthraquinone. Analyst 1984. [DOI: 10.1039/an9840901135] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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