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Alcaraz MR, Espinosa-Mansilla A, Durán-Merás I, Muñoz de la Peña A. An optimized methodology for the determination of multiclass organic ultraviolet sunscreens and metabolites in human milk through chromatographic and chemometric resolution. Talanta 2024; 270:125560. [PMID: 38128275 DOI: 10.1016/j.talanta.2023.125560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 12/11/2023] [Accepted: 12/13/2023] [Indexed: 12/23/2023]
Abstract
Organic UV filters (UVFS) are used to mitigate the dermal effects associated with health risks from UV radiation, making them essential in personal care products. UVFS are frequently identified in environmental samples due to their high lipophilicity and persistence, underscoring the urgency of comprehensive assessments and regulatory measures aimed at safeguarding ecosystems and human health. The present study reports a multiclass analytical method for determining 16 UV sunscreens and metabolites in breast milk based on an ultrasound-assisted-dispersive liquid-liquid micro-extraction (UA-DLLME) with further chromatographic and chemometric resolution. The experimental conditions of the UA-DLLME were optimized through the implementation of the Design of Experiment tools. To model the responses, least-squares and artificial neural network methodologies were implemented. The optimal conditions were found by employing the desirability function. The samples were analyzed through reverse-phase liquid chromatographic separation, UV diode array, and fast-scanning fluorescence detection. The chromatographic analysis enabled the resolution of 16 analytes in a total time of 13.0 min. Multivariate curve resolution-alternating least-square (MCR-ALS) modelling was implemented to resolve analytes that were not fully resolved and to determine analytes that coeluted with endogenous components of the breast milk samples. An enrichment factor of 5-fold concentration was obtained with this methodology, reaching recoveries between 65 % and 105 % for 13 multiclass UV sunscreens and metabolites in breast milk samples with RSD % and REP % lower than 12 %.
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Affiliation(s)
- Mirta R Alcaraz
- Laboratorio de Desarrollo Analítico y Quimiometría (LADAQ), Cátedra de Química Analítica I, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Ciudad Universitaria, Santa Fe, S3000ZAA, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290 CABA, C1425FQB, Argentina; Departamento de Química Analítica, Universidad de Extremadura, Badajoz, 06006, Spain.
| | | | - Isabel Durán-Merás
- Departamento de Química Analítica, Universidad de Extremadura, Badajoz, 06006, Spain
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Martín-Tornero E, de Jorge Páscoa RNM, Espinosa-Mansilla A, Martín-Merás ID, Lopes JA. Comparative quantification of chlorophyll and polyphenol levels in grapevine leaves sampled from different geographical locations. Sci Rep 2020; 10:6246. [PMID: 32277161 PMCID: PMC7148322 DOI: 10.1038/s41598-020-63407-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 03/27/2020] [Indexed: 01/23/2023] Open
Abstract
Near infrared spectroscopy (NIRS) and mid-infrared spectroscopy (MIRS) in combination with chemometric analysis were applied to discriminate the geographical origin of grapevine leaves belonging to the variety “Touriga Nacional” during different vegetative stages. Leaves were collected from plants of two different wine regions in Portugal (Dão and Douro) over the grapes maturation period. A sampling plan was designed in order to obtain the most variability within the vineyards taking into account variables such as: solar exposition, land inclination, altitude and soil properties, essentially. Principal component analysis (PCA) was used to extract relevant information from the spectral data and presented visible cluster trends. Results, both with NIRS and MIRS, demonstrate that it is possible to discriminate between the two geographical origins with an outstanding accuracy. Spectral patterns of grapevine leaves show significant differences during grape maturation period, with a special emphasis between the months of June and September. Additionally, the quantification of total chlorophyll and total polyphenol content from leaves spectra was attempted by both techniques. For this purpose, partial least squares (PLS) regression was employed. PLS models based on NIRS and MIRS, both demonstrate a statistically significant correlation for the total chlorophyll (R2P = 0.92 and R2P = 0.76, respectively). However, the PLS model for the total polyphenols, may only be considered as a screening method, because significant prediction errors, independently of resourcing on NIRS, MIRS or both techniques simultaneously, were obtained.
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Affiliation(s)
- Elísabet Martín-Tornero
- Department of Analytical Chemistry & Research Institute on Water, Climate Change & Sustainability (IACYS), University of Extremadura, 06006, Badajoz, Spain
| | - Ricardo Nuno Mendes de Jorge Páscoa
- LAQV/REQUIMTE, Laboratório de Química Aplicada, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313, Porto, Portugal.
| | - Anunciación Espinosa-Mansilla
- Department of Analytical Chemistry & Research Institute on Water, Climate Change & Sustainability (IACYS), University of Extremadura, 06006, Badajoz, Spain
| | - Isabel Durán Martín-Merás
- Department of Analytical Chemistry & Research Institute on Water, Climate Change & Sustainability (IACYS), University of Extremadura, 06006, Badajoz, Spain
| | - João Almeida Lopes
- Research Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisbon, Portugal
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Espinosa-Mansilla A, Peña AMD, Salinas F. Semiautomatic Determination of Furanic Aldehydes in Food and Pharmaceutical Samples by a Stopped-Flow Injection Analysis Method. J AOAC Int 2020. [DOI: 10.1093/jaoac/76.6.1255] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
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, 06071 Badajoz, Spain
| | - A Muñoz Dela Peña
- University of Extremadura, Department of Analytical Chemistry, 06071 Badajoz, Spain
| | - F Salinas
- University of Extremadura, Department of Analytical Chemistry, 06071 Badajoz, Spain
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Martin-Tornero E, Luque-Uría A, Durán-Merás I, Espinosa-Mansilla A. A novel analytical methodology for the determination of hydroxy polycyclic aromatic hydrocarbons in breast and cow milk samples. J Chromatogr B Analyt Technol Biomed Life Sci 2020; 1136:121912. [PMID: 31841982 DOI: 10.1016/j.jchromb.2019.121912] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/27/2019] [Accepted: 11/28/2019] [Indexed: 12/30/2022]
Abstract
Hydroxy polycyclic aromatic hydrocarbons (OHPAHs) in biological fluids, such as milk, are considered as biomarkers of exposure to polycyclic aromatic hydrocarbons (PAHs) in organism. The presence of OHPAHs in milk samples indicates a potential contamination on human organisms and milk producing animals. In this way, infants can be contaminated by lactation through the consumption of milk of both, human and animal origins. In this paper, eight OHPAHs have been analyzed in commercial cow milks and in human breast milk using HPLC and fast scanning fluorimetric detection (FSFD). Extraction and cleaning procedures of OHPAHs from milk samples have been investigated, and the experimental results using two bibliographic protocols and a new proposed protocol have been compared. The new protocol using enzymatic hydrolysis, proteins precipitation and, solvent extraction using acetonitrile, was proposed as the most adequate for the determination of 2-hydroxyfluorene, 1-/9-, 2-/3- and 4-hydroxyphenanthrenes, 1-hydroxypyrene and 3-hydroxybenzo[a]pyrene. The method recoveries ranged from 80-102% and 75-91% for fresh cow milk and for human breast milk, respectively, for all components except for 3-OHBz[a] Py. Low recovery values were calculated for 3-hydroxybenzo[a]pyrene in all cases. No statistical difference in the method performance was observed between fresh cow milk and human breast milk.
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Affiliation(s)
- E Martin-Tornero
- Department of Analytical Chemistry, University of Extremadura, 06006 Badajoz, Spain; Research Institute on Water, Climate Change & Sustainability (IACYS), University of Extremadura, 06006 Badajoz, Spain.
| | - A Luque-Uría
- Department of Analytical Chemistry, University of Extremadura, 06006 Badajoz, Spain
| | - I Durán-Merás
- Department of Analytical Chemistry, University of Extremadura, 06006 Badajoz, Spain; Research Institute on Water, Climate Change & Sustainability (IACYS), University of Extremadura, 06006 Badajoz, Spain
| | - A Espinosa-Mansilla
- Department of Analytical Chemistry, University of Extremadura, 06006 Badajoz, Spain; Research Institute on Water, Climate Change & Sustainability (IACYS), University of Extremadura, 06006 Badajoz, Spain
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Martín Tornero E, Espinosa-Mansilla A, Muñoz de la Peña A, Durán Merás I. Phenanthrene metabolites determination in human breast and cow milk by combining elution time-emission fluorescence data with multiway calibration. Talanta 2018; 188:299-307. [DOI: 10.1016/j.talanta.2018.05.096] [Citation(s) in RCA: 7] [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: 04/04/2018] [Revised: 05/24/2018] [Accepted: 05/28/2018] [Indexed: 12/15/2022]
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Martín Tornero E, Espinosa-Mansilla A, Durán Merás I. High-performance liquid chromatography with fast-scanning fluorescence detection and post-column on-line photoderivatization for the analysis of folic acid and its metabolites in vegetables. Microchem J 2017. [DOI: 10.1016/j.microc.2017.03.044] [Citation(s) in RCA: 13] [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: 11/15/2022]
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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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Hurtado-Sánchez MDC, Espinosa-Mansilla A, Durán-Merás I. Influence of the presence of natural monosaccharides in the quantification of α-dicarbonyl compounds in high content sugar samples. A comparative study by ultra-high performance liquid chromatography–single quadrupole mass spectrometry using different derivatization reactions. J Chromatogr A 2015; 1422:117-127. [DOI: 10.1016/j.chroma.2015.10.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 09/16/2015] [Accepted: 10/02/2015] [Indexed: 11/16/2022]
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Hurtado-Sánchez MDC, Espinosa-Mansilla A, Rodríguez-Cáceres MI, Durán-Merás I. Evaluation of liquid chromatographic behavior of lumazinic derivatives, from α-dicarbonyl compounds, in different C18 columns: application to wine samples using a fused-core column and fluorescence detection. J Agric Food Chem 2014; 62:97-106. [PMID: 24325310 DOI: 10.1021/jf404180t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Several C18 columns, packed with totally porous particles of different sizes and shell thicknesses, have been compared for simultaneous determination of α-dicarbonyl compounds, previous derivatization to lumazinic derivatives. Chromatographic conditions for the separation have been optimized for each column, and chromatographic parameters have been calculated and exhaustively compared. A core-shell C18 column provided the best results, and a HPLC method with fluorimetric detection has been proposed. The developed method has been validated in terms of linearity, precision, and sensitivity. Detection and quantification limits obtained were comprised between 0.02 and 0.30 and 0.07 and 1.0 ng mL(-1), respectively, while RSD values obtained were lower than 6% and 5% in intraday and interday repeatability studies, respectively. The method has been applied to analysis of the α-dicarbonyl compounds in different types of wines. The higher levels of the total α-dicarbonyl compounds were found in sweet wines and the lower levels in white wines.
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del Carmen Hurtado-Sánchez M, Espinosa-Mansilla A, Rodríguez-Cáceres MI, Martín-Tornero E, Durán-Merás I. Development of a method for the determination of advanced glycation end products precursors by liquid chromatography and its application in human urine samples. J Sep Sci 2012; 35:2575-84. [DOI: 10.1002/jssc.201200255] [Citation(s) in RCA: 29] [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: 03/28/2012] [Revised: 05/16/2012] [Accepted: 05/23/2012] [Indexed: 01/13/2023]
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Calvo P, Lozano M, Espinosa-Mansilla A, González-Gómez D. In-vitro evaluation of the availability of ϖ-3 and ϖ-6 fatty acids and tocopherols from microencapsulated walnut oil. Food Res Int 2012. [DOI: 10.1016/j.foodres.2012.05.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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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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de Llanos AM, Espinosa-Mansilla A, Cañada-Cañada F, de la Peña AM. Separation and determination of 11 marker pteridines in human urine by liquid chromatography and fluorimetric detection. J Sep Sci 2011; 34:1283-92. [DOI: 10.1002/jssc.201000900] [Citation(s) in RCA: 17] [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] [Received: 12/15/2010] [Revised: 02/07/2011] [Accepted: 03/08/2011] [Indexed: 11/10/2022]
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Cañada-Cañada F, Espinosa-Mansilla A, Muñoz de la Peña A, Mancha de Llanos A. Determination of marker pteridins and biopterin reduced forms, tetrahydrobiopterin and dihydrobiopterin, in human urine, using a post-column photoinduced fluorescence liquid chromatographic derivatization method. Anal Chim Acta 2009; 648:113-22. [PMID: 19616696 DOI: 10.1016/j.aca.2009.06.045] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [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: 02/26/2009] [Revised: 06/17/2009] [Accepted: 06/17/2009] [Indexed: 11/18/2022]
Abstract
A liquid chromatographic method for the simultaneous analysis of marker pteridins and biopterin reduced forms, in urine samples is proposed. A Zorbax Eclipse XDB-C18 column was used for the chromatographic separation, using a 98/2 (v/v), citrate buffer (pH 5.5)-acetonitrile mobile phase, in isocratic mode. A post-column photoderivatization was carried out with an on-line photoreactor, located between a diode array detector (DAD) and a fast scanning fluorescence detector (FSFD). Neopterin (NEO), biopterin (BIO), pterin (PT) and dihydrobiopterin (BH2) were determined by measuring native fluorescence, using the photoreactor in OFF-mode, and tetrahydrobiopterin (BH4) was determined by measuring of the induced fluorescence of the generated photoproducts, using the photoreactor in ON-mode. In addition, Creatinine (CREA), as a reference of metabolites excrection in urine, was simultaneously determined using the DAD detector. Detection limits were 0.2, 13.0, 0.3, 0.3 and 3.5 ng mL(-1), for NEO, BH2, BIO, PT and BH4, respectively, and 0.4 microg mL(-1) for CREA. Ratio values for NEO/CREA, PT/CREA, BH4/CREA, BH2/CREA, NEO/BIO and BIO(total)/CREA, in urine samples, of healthy children and adults, phenylketonuric children and infected mononucleosis children, are reported. A comparative study, about the mean values obtained for each of the compounds, by the present procedure and by the classical iodine oxidation method (Fukushimas method), has been performed, in urine samples belonging to healthy volunteers. The values obtained were BH4/CREA: 0.41, BH2/CREA: 0.31 and BIO(total)/CREA: 0.73, by the proposed method, and BH4/CREA: 0.35, BH2/CREA: 0.20 and BIO(total)/CREA: 0.48, by iodine oxidation method.
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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, Espinosa-Mansilla A, Peña AMDL, Girón AJ, González-Gómez D. Determination of danofloxacin in milk combining second-order calibration and standard addition method using excitation–emission fluorescence data. Food Chem 2009. [DOI: 10.1016/j.foodchem.2008.08.032] [Citation(s) in RCA: 14] [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: 10/21/2022]
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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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Espinosa-Mansilla A, Durán-Merás I, Cañada FC, Márquez MP. High-performance liquid chromatographic determination of glyoxal and methylglyoxal in urine by prederivatization to lumazinic rings using in serial fast scan fluorimetric and diode array detectors. Anal Biochem 2007; 371:82-91. [PMID: 17884007 DOI: 10.1016/j.ab.2007.07.028] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [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: 06/01/2007] [Revised: 07/17/2007] [Accepted: 07/26/2007] [Indexed: 11/15/2022]
Abstract
Glyoxal and methylglyoxal are two important markers of oxidative stress and both are involved in the evaluation of several diseases. A new HPLC method for determining glyoxal and methylglyoxal in urine was developed. The method is based on the reaction of alpha-dialdehydes, glyoxal and methylglyoxal, with 5,6-diamino-2,4-hydroxypyrimidine sulfate in basic medium to form highly fluorescent lumazine derivatives. Creatinine was also included in the method even though it does not react with the reagent. The derivatives and creatinine are separated on a C(18) reversed-phase column with a mobile phase consisting of acetonitrile:citrate buffer, pH 6.0 (3:97 v/v). The flow rate was 1.0mLmin(-1) and the effluent was monitored photometrically at 250 nm for determination of creatinine and fluorimetrically at 500 nm (exciting at 330 nm) for determination of glyoxal and methylglyoxal derivatives. Recording time of the separation is less than 10 min. Determination of the analytes is performed in urine after incubation of the sample, with the reagent in alkaline medium, for 30 min at 60 degrees C. Urinary levels of glyoxal and methylglyoxal, expressed as glyoxal/creatinine and methylglyoxal/creatinine ratios, in healthy young women and men were determined. For women, values of 0.80+/-0.37 and 0.60+/-0.22 microg/mg of creatinine were found for glyoxal and methylglyoxal, respectively. For men, values of 0.63+/-0.15 and 0.49+/-0.05 microg/mg of creatinine were found for glyoxal and methylglyoxal, respectively. These results were also related to the body mass index of each individual.
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Cañada-Cañada F, Espinosa-Mansilla A, Muñoz de la Peña A. Separation of fifteen quinolones by high performance liquid chromatography: Application to pharmaceuticals and ofloxacin determination in urine. J Sep Sci 2007; 30:1242-9. [PMID: 17623463 DOI: 10.1002/jssc.200600536] [Citation(s) in RCA: 31] [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] [Indexed: 11/06/2022]
Abstract
A simple chromatographic method is described for assaying 15 quinolones and fluoroquinolones (pipemidic acid, marbofloxacin, enoxacin, ofloxacin, norfloxacin, ciprofloxacin, danofloxacin, lomefloxacin, enrofloxacin, sarafloxacin, difloxacin, oxolinic acid, nalidixic acid, flumequine and piromidic acid), in urine and pharmaceutical samples. The determination was achieved by LC using an RP C18 analytical column. A mobile phase composed of mixtures of methanol-ACN-10 mM citrate buffer at pH 3.5 and 10 mM citrate buffer at pH 4.5, delivered under an optimum gradient program, at a flow rate of 1.5 mL/min, allows to accomplish the chromatographic separation in 26 min. For detection, diode-array UV-Vis at 280 nm and fluorescence detection set at excitation wavelength/emission wavelength: 280/450, 280/ 495, 280/405 and 320/360 nm were used. Detection and quantification limits were between 0.3-18 and 0.8-61 ng/mL, respectively. The method was validated in terms of interday (n = 6) and intraday (n = 6) precision and accuracy. The procedure was successfully applied to the analysis of human and veterinary pharmaceuticals. Also, ofloxacin was determined in human urine samples belonging to a patient undergoing treatment with this active principle, among others.
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Durán Merás I, Espinosa-Mansilla A, Rodríguez DA. Complexation study of cinalukast and montelukast with cyclodextrines. J Pharm Biomed Anal 2007; 43:1025-32. [PMID: 17118608 DOI: 10.1016/j.jpba.2006.10.007] [Citation(s) in RCA: 12] [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] [Received: 06/05/2006] [Revised: 10/02/2006] [Accepted: 10/04/2006] [Indexed: 11/27/2022]
Abstract
A fluorimetric study on the spectral characteristics of two antileukotrienes, cinalukast and montelukast, has been performed. Ionization constants of both of them have been photometrically calculated. Cinalukast pK(a) in ethanol:water 50:50 (v/v) medium resulted to be 2.2+/-0.1. Because the spectral characteristics of montelukast are widely affected by the solvent nature, pK(a) was estimated in two different ethanol:water media, 70:30 (v/v) and 10:90 (v/v) and the values calculated were pK(a)=2.9+/-0.1, and pK(a1)=2.0+/-0.1 and pK(a2)=6.5+/-0.1, respectively. It has been proven that the fluorescence of both, cinalukast and montelukast, is significantly intensified in the presence of cyclodextrins (CyDs). The host-guest complexation processes between cinalukast and alpha-CyD or heptakis-(2,6-di-O-methyl)-beta-cyclodextrin (DIMEB) and between montelukast and DIMEB have been investigated by fluorescence spectroscopy. A 1:1 stoichiometric ratio was established for the three studied inclusion complexes. The changes produced on the fluorescence of cinalukast or montelukast, when they are included on the hydrophobic CyD cavity are used to calculate their association constants by a non-linear regression method. Semiempirical MO calculations using AM1 method were performed in order to characterize the studied inclusion complexes. A new method for cinalukast determination in human serum, based on the fluorescence of the complex cinalukast-DIMEB exhibiting limit of detection of 7.95 ng mL(-1) has been proposed with satisfactory results. Adequate recovery values between 95 and 103% were calculated at five different concentration levels.
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Affiliation(s)
- I Durán Merás
- Department of Analytical Chemistry, University of Extremadura, 06071 Badajoz, Spain.
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Espinosa-Mansilla A, Muñoz de la Peña A, González Gómez D, Cañada-Cañada F. HPLC determination of ciprofloxacin, cloxacillin, and ibuprofen drugs in human urine samples. J Sep Sci 2006; 29:1969-76. [PMID: 17017009 DOI: 10.1002/jssc.200600126] [Citation(s) in RCA: 25] [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] [Indexed: 11/11/2022]
Abstract
This paper reports, for the first time, a liquid chromatographic method for the simultaneous determination of three frequently co-administered active principles, two antibiotics, ciprofloxacin (CIPRO) and cloxacillin (CLOXA) belonging to the fluoroquinolones and beta-lactam families, respectively, and ibuprofen (IBU), a non-steroidal anti-inflammatory drug. The chromatographic separation was performed on a C-18 analytical column, using isocratic elution with methanol-acetonitrile-pH 3 formate buffer (CT = 0.1 M) (15:12:73, v/v/v) for 3 min and, after that, a linear gradient with methanol-acetonitrile (88:12, v/v) for 8 min. Several absorption spectra were obtained for each peak using a DAD detector. Chromatograms at the maximum absorption wavelength for each analyte, 220 nm for both IBU and CLOXA, and 280 nm for CIPRO were selected as the most suitable. The proposed chromatographic method requires about 15 min per sample. The presence of a urine background was tested and no interference was found. The method was satisfactorily applied to the determination of CIPRO, CLOXA, and IBU, in fortified urine, and in urine samples from a patient undergoing treatment with these three active principles, among others. Limits of quantification in urine were 1.00, 1.70, and 2.87 microg/mL for CIPRO, CLOXA, and IBU, respectively.
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Affiliation(s)
- Anunciación Espinosa-Mansilla
- Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, Campus Universitario, Badajoz, Spain
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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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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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25
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Espinosa-Mansilla A, Muñoz de la Peña A, Goicoechea HC, Olivieri AC. Two multivariate strategies applied to three-way kinetic spectrophotometric data for the determination of mixtures of the pesticides carbaryl and chlorpyrifos. Appl Spectrosc 2004; 58:83-90. [PMID: 14727724 DOI: 10.1366/000370204322729504] [Citation(s) in RCA: 24] [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] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Two pesticides, carbaryl and chlorpyrifos, have been simultaneously determined using second-order kinetic spectrophotometric measurements upon alkaline oxidative degradation. In spite of the complexity of the system and of the serious spectral overlap among the reagents and products, calibration and prediction is possible thanks to the power of second-order multivariate techniques. Strategies such as parallel factor analysis (PARAFAC) and multivariate curve resolution coupled to alternating least-squares (MCR-ALS) have been employed, which adequately exploit the second-order advantage. They allow for a correct determination of the analytes both in synthetic binary samples and in a commercial formulation, in this latter case even in the presence of unmodeled interferents. Multi-way partial least-squares (n-PLS) produced good results only on synthetic binary mixtures but could not be applied to a commercial sample because it contained an uncalibrated component.
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Galeano Diaz T, Espinosa-Mansilla A, Murillo B, Salinas F. Voltammetric Behavior and Determination of Nordihydroguaiaretic Acid in Presence of Other Antioxidants Using PLS Calibration. ELECTROANAL 2003. [DOI: 10.1002/elan.200390081] [Citation(s) in RCA: 8] [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: 11/09/2022]
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Acedo-Valenzuela MI, Espinosa-Mansilla A, Muñoz De La Peña A, Cañada-Cañada F. Determination of antitubercular drugs by micellar electrokinetic capillary chromatography (MEKC). Anal Bioanal Chem 2002; 374:432-6. [PMID: 12373391 DOI: 10.1007/s00216-002-1494-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [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: 04/19/2002] [Revised: 07/04/2002] [Accepted: 07/08/2002] [Indexed: 11/29/2022]
Abstract
A method for the determination of isoniazid (ISO), pyrazinamide (PYR) and rifampicin (RIF) in pharmaceutical products, by micellar electrokinetic capillary chromatography (MEKC) with ultraviolet detection is described. The influence of pH, concentration of surfactants, buffer and organic solvents, over the separation were studied as experimental variables. The optimal separation was carried out at 30 degrees C and 20 kV, using a 40 mM borate buffer and 100 mM sodium dodecylsulphate (SDS) adjusted to pH 8.5. Under these conditions, the analysis is accomplished in about 8 min. The method was applied to the determination of these compounds in different pharmaceuticals with good results when compared with a reference liquid chromatographic (LC) method.
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Affiliation(s)
- M I Acedo-Valenzuela
- Department of Analytical Chemistry, Faculty of Science, University of Extremadura, Avda. de Elvas s/n, 06011-Badajoz, Spain.
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Espinosa-Mansilla A. Determination of antitubercular drugs in urine and pharmaceuticals by LC using a gradient flow combined with programmed diode array photometric detection. Talanta 2002; 58:273-80. [DOI: 10.1016/s0039-9140(02)00240-0] [Citation(s) in RCA: 27] [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: 01/28/2002] [Revised: 04/23/2002] [Accepted: 05/03/2002] [Indexed: 11/15/2022]
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Espinosa-Mansilla A. Selection of the wavelength range and spectrophotometric determination of leucovorin and methotrexate in human serum by a net analyte signal based method. Talanta 2002; 58:255-63. [DOI: 10.1016/s0039-9140(02)00243-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2001] [Revised: 04/30/2002] [Accepted: 05/03/2002] [Indexed: 11/28/2022]
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Espinosa-Mansilla A, Durán Merás I, Zamora Madera A, Pedano L, Ferreyra C. Kinetic fluorimetric determination of the antineoplastic methotrexate (MTX) in human serum. J Pharm Biomed Anal 2002; 29:851-8. [PMID: 12093518 DOI: 10.1016/s0731-7085(02)00212-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [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: 11/26/2022]
Abstract
A kinetic study of the oxidation of methotrexate (MTX) in acidic medium and in the presence of potassium permanganate has been made on the basis of the fluorescence-time curves. A kinetic method for the determination of MTX was developed with a range of application between 0.22 and 3.30 microM. The proposed kinetic method permits us to determine MTX in human serum and to avoid the natural fluorescence of the serum. A detection limit of 0.18 microM was calculated in the presence of ascorbic acid as activator. Only 100 s per sample is necessary for the analysis. The interference of pteridin derivatives and the rescue agent folinic acid (leucovorin) was tested.
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Affiliation(s)
- A Espinosa-Mansilla
- Department of Analytical Chemistry, University of Extremadura, 06071, Badajoz, Spain.
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Durán Merás I, Espinosa-Mansilla A, Rodrı́guez Gómez M, Salinas López F. Kinetic fluorimetric study of the oxidation reaction of folinic acid (leucovorin) with potassium permanganate. Determination in human urine. Talanta 2001; 55:623-30. [DOI: 10.1016/s0039-9140(01)00472-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2001] [Accepted: 06/12/2001] [Indexed: 11/25/2022]
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Espinosa-Mansilla A, Cabanillas AG, Salinas F, Mora N, Zamoro A. Rapid Kinetic Spectrophotometric Determination of Phosalone (Zolone) in a Commercial Formulation. J AOAC Int 2000. [DOI: 10.1093/jaoac/83.1.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
A kinetic study of the degradation of phosalone in an alkaline medium was undertaken by using a pneumatic stopped-flow system. A rapid semiautomatic method is proposed for determining phosalone. Linear calibration graphs up to 8.0 × 10−5M (detection limit = 1.40 × 10−6M) were obtained, with a measurement period of only 3.5 s per sample and a relative standard deviation of 1.4%. Several pesticides were assayed as interference species, and several did not interfere even at a 6:1, M:M foreign species/phosalone ratio. A strong interference (ratio < 1) was generated by azinphos-methyl and carbaryl. The proposed method was applied to the analysis of a commercial formulation, and the results were validated by comparison with those for a chromatographic method.
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Affiliation(s)
| | | | - Francisco Salinas
- University of Extremadura, Department of Analytical Chemistry, 06071 Badajoz, Spain
| | - Nielena Mora
- University of Extremadura, Department of Analytical Chemistry, 06071 Badajoz, Spain
| | - Angel Zamoro
- University of Extremadura, Department of Analytical Chemistry, 06071 Badajoz, Spain
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Espinosa-Mansilla A, Guiberteau Cabanillas A, Salinas F, Mora N, Zamoro A. Rapid kinetic spectrophotometric determination of phosalone (Zolone) in a commercial formulation. J AOAC Int 2000; 83:1-7. [PMID: 10692997] [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: 02/15/2023]
Abstract
A kinetic study of the degradation of phosalone in an alkaline medium was undertaken by using a pneumatic stopped-flow system. A rapid semiautomatic method is proposed for determining phosalone. Linear calibration graphs up to 8.0 x 10(-5) M (detection limit = 1.40 x 10(-6) M) were obtained, with a measurement period of only 3.5 s per sample and a relative standard deviation of 1.4%. Several pesticides were assayed as interference species, and several did not interfere even at a 6:1, M:M foreign species/phosalone ratio. A strong interference (ratio < 1) was generated by azinphos-methyl and carbaryl. The proposed method was applied to the analysis of a commercial formulation, and the results were validated by comparison with those for a chromatographic method.
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Affiliation(s)
- A Espinosa-Mansilla
- University of Extremadura, Department of Analytical Chemistry, Badajoz, Spain
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Espinosa-Mansilla A, Madera AZ, Salinas F. Use of a stopped-flow pneumatic mixing module to analyze dinitrophenol pesticides. Simultaneous determination of dinoseb and dinobuton. J Agric Food Chem 1999; 47:1976-1980. [PMID: 10552481 DOI: 10.1021/jf980821b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A kinetic study of the degradation of dinobuton in an alkaline medium has been undertaken by using a stopped-flow pneumatic system. A semiautomatic method for determining dinobuton is proposed for the first time. A detection limit of 0.40 microg mL(-)(1) was calculated. Simultaneous determination of dinobuton and dinoseb can be made by combination of equilibrium and kinetic measurements. The proposed method has been applied to analyze binary mixtures of dinobuton and dinoseb samples with the amount of both components simulating the composition of one undegraded and several degraded dinobuton samples. Also, the procedure has been tested in the analysis of a commercial formulation of dinobuton and the results validated with high-performance liquid chromatography (HPLC).
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Affiliation(s)
- A Espinosa-Mansilla
- Department of Analytical Chemistry, University of Extremadura, Badajoz, Spain.
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Espinosa-Mansilla A, Acedo Valenzuela M, Salinas F, Cañada Cañada F. Kinetic determination of ansamicins in pharmaceutical formulations and human urine. Manual and semiautomatic (stopped-flow) procedures. Anal Chim Acta 1998. [DOI: 10.1016/s0003-2670(98)00537-6] [Citation(s) in RCA: 21] [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: 11/26/2022]
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Espinosa-Mansilla A, Durán-Merás I, Salinas F. Simultaneous determination of pteridines in multicomponent mixtures using derivative spectrophotometry and partial least-squares calibration. J Pharm Biomed Anal 1998; 17:1325-34. [PMID: 9800651 DOI: 10.1016/s0731-7085(98)00036-3] [Citation(s) in RCA: 18] [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: 11/18/2022]
Abstract
Simple binary mixtures composed of very similar pteridines (neopterin and pterin) have been resolved by derivative spectrophotometry. Detection limits of 0.30 microgram ml-1 and 0.12 microgram ml-1 for pterin and neopterin, respectively, have been calculated. Also, different mixtures of pteridines considered as disease markers, such as pterin, neopterin, xanthopterin and isoxanthopterin, have been determined by using a partial least-squares (PLS-2) model. Calibration set containing 0-7 micrograms ml-1 for each component was used. The resolution of several mixtures and single determination was tested in artificial samples.
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Affiliation(s)
- A Espinosa-Mansilla
- Department of Analytical Chemistry, University of Extremadura, Badajoz, Spain
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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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Espinosa-Mansilla A, Durán-Merás I, Salinas F. High-performance liquid chromatographic-fluorometric determination of glyoxal, methylglyoxal, and diacetyl in urine by prederivatization to pteridinic rings. Anal Biochem 1998; 255:263-73. [PMID: 9451513 DOI: 10.1006/abio.1997.2470] [Citation(s) in RCA: 39] [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] [Indexed: 02/06/2023]
Abstract
A sensitive and simple liquid chromatographic method to determine glyoxal, methylglyoxal, and diacetyl is reported. The method is based on the conversion to the corresponding pteridin derivatives (pterin, 6-methylpterin, and 6,7-dimethylpterin). The proposed method using fluorometric detection has been applied to the determination of the three alpha-dicarbonyl compounds in human urine. Linearity (peak area vs concentration of alpha-dicarbonyl) was observed at least up to 43 microM. Detection limits of 32 pmol for glyoxal, 11 pmol for methylglyoxal, and 99 pmol for diacetyl were calculated (20 microliters was injected). Levels of 132 microM for glyoxal and 15 microM for methylglyoxal were determined in normal urine samples, while diacetyl was not detected.
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Affiliation(s)
- A Espinosa-Mansilla
- Department of Analytical Chemistry, University of Extremadura, Badajoz, Spain
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Espinosa-Mansilla A, Salinas F, Payá IO. Abilities of partial least squares (PLS) multivariate calibration in the analysis of a quaternary mixture of sulfonamides. ACTA ACUST UNITED AC 1996. [DOI: 10.1007/pl00012717] [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] [Indexed: 11/28/2022]
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Espinosa-Mansilla A, Salinas F, De Orbe Paya I. Simultaneous determination of sulfadiazine, doxycycline, furaltadone and trimethoprim by partial least squares multivariate calibration. Anal Chim Acta 1995. [DOI: 10.1016/0003-2670(95)00252-u] [Citation(s) in RCA: 55] [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: 10/27/2022]
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42
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Cabanillas AG, Espinosa-Mansilla A, Salinas F, López-de-Alba PL. Polarographic behavior of 2-carboxybenzaldehyde thiosemicarbazone and the indirect trace determination of palladium(II) ions in catalysts. ELECTROANAL 1995. [DOI: 10.1002/elan.1140070514] [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: 11/08/2022]
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Salinas F, Espinosa-Mansilla A, López-de-Alba PL. Extraction–spectrophotometric determination of silver in ores, electronics flow-solders and white metals with 2-carboxybenzaldehyde thiosemicarbazone. Analyst 1995. [DOI: 10.1039/an9952002857] [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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Salinas F, Espinosa-Mansilla A, Lopez de Alba PL. Multivariate Prediction by Using Conventional and Derivative Partial Least Squares Statistics in a Complex Chemical System. Ternary Metals Mixture Resolution. ANAL LETT 1995. [DOI: 10.1080/00032719508006028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Cabanillas AG, Diaz TG, Espinosa-Mansilla A, Lopez FS. Resolution of ternary mixtures of nitrofurantoin, furazolidone and furaltadone by application of Partial Least Squares analysis to the differential pulse polarographic signals. Talanta 1994; 41:1821-32. [DOI: 10.1016/0039-9140(94)e0121-7] [Citation(s) in RCA: 23] [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: 02/18/1994] [Revised: 04/15/1994] [Accepted: 04/15/1994] [Indexed: 10/18/2022]
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Abstract
The influence of physicochemical conditions in the formation of derivatized malonaldehyde (MLD)-azulene was studied, and kinetic and conventional spectrophotometric data were compared. Conventional and kinetic spectrophotometric procedures were used to study inference of several compounds. An advantageous kinetic method was used to determine MLD in human plasma. The proposed method is faster than the thiobarbituric acid (TBA) method, because 150 s is sufficient to develop the reaction and the kinetic measurements. A comparative study of the results obtained using the proposed kinetic method and those reported in the literature for MLD determination by using the TBA reaction is presented.
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Affiliation(s)
- A Espinosa-Mansilla
- Department of Analytical Chemistry, University of Extremadura, Badajoz, Spain
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Espinosa-Mansilla A, Salinas F, Zamoro A. Simultaneous determination of chlorpyrifos and carbaryl by differential degradation using diode-array spectrophotometry optimized by partial least squares. Analyst 1994. [DOI: 10.1039/an9941901183] [Citation(s) in RCA: 19] [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: 11/21/2022]
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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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Durán-Merás I, Muńoz de la Peña A, Espinosa-Mansilla A, Salinas F. Multicomponent determination of flavour enhancers in food preparations by partial least squares and principal component regression modelling of spectrophotometric data. Analyst 1993; 118:807-13. [PMID: 8372976 DOI: 10.1039/an9931800807] [Citation(s) in RCA: 48] [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] [Indexed: 01/30/2023]
Abstract
Three multivariate calibration methods, partial least squares (PLS-1 and PLS-2) and principal component regression (PCR), were applied to the simultaneous determination of three flavour enhancers (inosine 5'-monophosphate, guanosine 5'-monophosphate and monosodium glutamate), in mixtures by ultraviolet/visible absorption spectrophotometry. The absorption and first- and second-derivative absorption spectra of the ternary mixtures were used to perform the optimization of the calibration matrices by the PLS and PCR methods. The results obtained by the application of the different chemometric approaches are discussed and compared. No significant advantages were found for the prior differentiation step. The proposed method was applied satisfactorily to the determination of inosine 5'-monophosphate and guanosine 5'-monophosphate in several food preparations, in the presence of monosodium glutamate.
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Affiliation(s)
- I Durán-Merás
- Department of Analytical Chemistry, University of Extremadura, Badajoz, Spain
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Espinosa-Mansilla A, Salinas F, Leal AR. Determination of malonaldehyde in human plasma: elimination of spectral interferences in the 2-thiobarbituric acid reaction. Analyst 1993; 118:89-95. [PMID: 8442512 DOI: 10.1039/an9931800089] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A selective, derivative spectrophotometric method has been developed for the determination of malonaldehyde (MLD), based on a reaction with 2-thiobarbituric acid (TBA). The proposed method has been applied to the determination of MLD in human plasma. A study to eliminate several spectral interferences is described. A comparative study of the results obtained using the proposed derivative method and a conventional TBA method applied to human plasma is presented and the advantages of the proposed method over the conventional method for the determination of MLD in human plasma are evaluated.
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Affiliation(s)
- A Espinosa-Mansilla
- Department of Analytical Chemistry, University of Extremadura, Badajoz, Spain
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