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Acebal CC, Grünhut M, Llamas NE, Insausti M, Zelená L, Sklenářová H, Solich P, Band BSF. An integrated on-line method for the preconcentration and simultaneous determination of metsulfuron methyl and chlorsulfuron using oxidized carbon nanotubes and second order fluorescent data. Microchem J 2016. [DOI: 10.1016/j.microc.2016.06.011] [Citation(s) in RCA: 7] [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: 11/15/2022]
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Insausti M, Fernández Band BS. Single excitation-emission fluorescence spectrum (EEF) for determination of cetane improver in diesel fuel. Spectrochim Acta A Mol Biomol Spectrosc 2015; 140:416-420. [PMID: 25617982 DOI: 10.1016/j.saa.2015.01.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 12/12/2014] [Accepted: 01/05/2015] [Indexed: 06/04/2023]
Abstract
A highly sensitive spectrofluorimetric method has been developed for the determination of 2-ethylhexyl nitrate in diesel fuel. Usually, this compound is used as an additive in order to improve cetane number. The analytical method consists in building the chemometric model as a first step. Then, it is possible to quantify the analyte with only recording a single excitation-emission fluorescence spectrum (EEF), whose data are introduced in the chemometric model above mentioned. Another important characteristic of this method is that the fuel sample was used without any pre-treatment for EEF. This work provides an interest improvement to fluorescence techniques using the rapid and easily applicable EEF approach to analyze such complex matrices. Exploding EEF was the key to a successful determination, obtaining a detection limit of 0.00434% (v/v) and a limit of quantification of 0.01446% (v/v).
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Affiliation(s)
- Matías Insausti
- Laboratorio FIA, INQUISUR - CONICET, Departamento de Química, Universidad Nacional del Sur, Av. Alem 1253, B8000CPB Bahía Blanca, Buenos Aires, Argentina
| | - Beatriz S Fernández Band
- Laboratorio FIA, INQUISUR - CONICET, Departamento de Química, Universidad Nacional del Sur, Av. Alem 1253, B8000CPB Bahía Blanca, Buenos Aires, Argentina.
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Pereyra MT, Fernández Band BS, Lista AG. Measurement uncertainty estimated from accuracy assessment by using an in-house reference material: two case studies for the extraction of total PAH in industrial wastewater sludges. Microchem J 2015. [DOI: 10.1016/j.microc.2014.12.001] [Citation(s) in RCA: 2] [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: 11/17/2022]
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Razuc MF, Grünhut M, Garrido M, Fernández Band BS. Second order advantage applied to the spectrophotometric analysis of ciprofloxacin and dexamethasone in ophthalmic drops; automatic green method using on-line photodegradation. ANAL SCI 2014; 30:1121-7. [PMID: 25492460 DOI: 10.2116/analsci.30.1121] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
On-line photodegradation and spectrophotometric analysis assisted by multivariate curve resolution-alternating least squares (MCR-ALS) was developed the simultaneous determination of ciprofloxacin (CIP) and dexamethasone (DEX) in ophthalmic suspensions using an automated flow-batch analysis (FBA) system. CIP and DEX have strongly overlapped UV spectra. Overcoming this lack of selectivity involves augmenting data dimensionality. This could be performed by adding information about the sample photodegradation to obtain the so-called second order advantage. Commercial sample analysis was successfully performed and no statistical differences (α = 0.05) with respect to pharmacopeia methods were obtained. The proposed method offers several advantages over the methods developed to date. In agreement with the principles of green chemistry, only water was used as solvent, low amounts of waste were generated and on-line waste treatment was included in the system. Moreover, the cost per analysis was significantly reduced compared to methods that employ separative techniques.
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Affiliation(s)
- Mariela F Razuc
- Laboratory of Flow Injection Analysis, INQUISUR (Universidad Nacional del Sur-CONICET)
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Acebal CC, Grünhut M, Šrámková I, Chocholouš P, Lista AG, Sklenářová H, Solich P, Band BSF. Application of a fully integrated photodegradation-detection flow-batch analysis system with an on-line preconcentration step for the determination of metsulfuron methyl in water samples. Talanta 2014; 129:233-40. [DOI: 10.1016/j.talanta.2014.05.024] [Citation(s) in RCA: 10] [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: 03/17/2014] [Revised: 05/14/2014] [Accepted: 05/16/2014] [Indexed: 10/25/2022]
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Alvarez MB, Quintas PY, Domini CE, Garrido M, Fernández Band BS. Chemometric approach to visualize and easily interpret data from sequential extraction procedures applied to sediment samples. J Hazard Mater 2014; 274:455-464. [PMID: 24813665 DOI: 10.1016/j.jhazmat.2014.04.039] [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] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 03/25/2014] [Accepted: 04/20/2014] [Indexed: 06/03/2023]
Abstract
The aim of this study was to assess metal mobility/availability in coastal surface (oxic) sediment samples from the Bahía Blanca estuary. Particularly, two sequential extraction procedures able to discriminate metals associated to amorphous Fe and Mn oxides and those associated with crystalline oxides of Fe were applied. Sequential procedures differ in the number of steps, type of reagents used, and in the order in which metals associated to organic matter are extracted. The studied metals were Cd, Cr, Cu, Pb, Ni and Zn because of their hazardous potential and relative abundance in the estuary. Tucker4 model with three factors describes appropriately the data sets (explained variance of 64.05%). This model made it possible to visualize and explain the information underlying in the data set. From the multivariate analysis, it was possible to evaluate the metal behaviour and their availability. In this way, Cd and Zn are associated to the more available fractions whereas Ni, Cr, Cu and Pb are mainly associated to the unavailable fractions. On the other hand, Zn and Cu are associated to organic matter fraction. Despite the fact that the two-fractionation schemes are quite different, the results obtained with both schemes are comparable.
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Affiliation(s)
- Mónica B Alvarez
- Instituto de Química del Sur, INQUISUR (UNS-CONICET), Av. Alem 1253, B8000CPB Bahía Blanca, Buenos Aires, Argentina.
| | - Pamela Y Quintas
- Marine Chemistry Laboratory, IADO (UNS-CONICET), Florida 8000, B8000FWB, Bahía Blanca, Buenos Aires, Argentina
| | - Claudia E Domini
- Instituto de Química del Sur, INQUISUR (UNS-CONICET), Av. Alem 1253, B8000CPB Bahía Blanca, Buenos Aires, Argentina
| | - Mariano Garrido
- Instituto de Química del Sur, INQUISUR (UNS-CONICET), Av. Alem 1253, B8000CPB Bahía Blanca, Buenos Aires, Argentina
| | - Beatriz S Fernández Band
- Instituto de Química del Sur, INQUISUR (UNS-CONICET), Av. Alem 1253, B8000CPB Bahía Blanca, Buenos Aires, Argentina
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Pereyra MT, Lista AG, Fernández Band BS. Quantification of uncertainty in mercury wastewater analysis at different concentration levels and using information from proficiency test with a limited number of participants. Talanta 2013; 111:69-75. [PMID: 23622527 DOI: 10.1016/j.talanta.2013.02.045] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 02/15/2013] [Accepted: 02/17/2013] [Indexed: 10/27/2022]
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Insausti M, Romano C, Pistonesi MF, Band BSF. Simultaneous determination of quality parameters in biodiesel/diesel blends using synchronous fluorescence and multivariate analysis. Microchem J 2013. [DOI: 10.1016/j.microc.2012.12.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [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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Razuc M, Garrido M, Caro YS, Teglia CM, Goicoechea HC, Fernández Band BS. Hybrid hard- and soft-modeling of spectrophotometric data for monitoring of ciprofloxacin and its main photodegradation products at different pH values. Spectrochim Acta A Mol Biomol Spectrosc 2013; 106:146-54. [PMID: 23376269 DOI: 10.1016/j.saa.2012.12.085] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 12/07/2012] [Accepted: 12/31/2012] [Indexed: 05/12/2023]
Abstract
A simple and fast on line spectrophotometric method combined with a hybrid hard-soft modeling multivariate curve resolution (HS-MCR) was proposed for the monitoring of photodegradation reaction of ciprofloxacin under UV radiation. The studied conditions attempt to emulate the effect of sunlight on these antibiotics that could be eventually present in the environment. The continuous flow system made it possible to study the ciprofloxacin degradation at different pH values almost at real time, avoiding errors that could arise from typical batch monitoring of the reaction. On the base of a concentration profiles obtained by previous pure soft-modeling approach, reaction pathways have been proposed for the parent compound and its photoproducts at different pH values. These kinetic models were used as a constraint in the HS-MCR analysis. The kinetic profiles and the corresponding pure response profile (UV-Vis spectra) of ciprofloxacin and its main degradation products were recovered after the application of HS-MCR analysis to the spectra recorded throughout the reaction. The observed behavior showed a good agreement with the photodegradation studies reported in the bibliography. Accordingly, the photodegradation reaction was studied by high performance liquid chromatography coupled with UV-Vis diode array detector (HPLC-DAD). The spectra recorded during the chromatographic analysis present a good correlation with the ones recovered by UV-Vis/HS-MCR method.
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Affiliation(s)
- Mariela Razuc
- FIA Laboratory, Department of Chemistry, Universidad Nacional del Sur, INQUISUR (UNS-CONICET), Av. Alem 1253, Bahía Blanca (B8000CPB), Buenos Aires, Argentina
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B. Lima M, Insausti M, Domini CE, Pistonesi MF, Ugulino de Araújo MC, Fernández Band BS. Automatized flow-batch method for fluorescent determination of free glycerol in biodiesel samples using on-line extraction. Talanta 2012; 89:21-6. [DOI: 10.1016/j.talanta.2011.10.055] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 10/27/2011] [Accepted: 10/28/2011] [Indexed: 10/15/2022]
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Grünhut M, Martins VL, Centurión ME, Ugulino Araújo MC, Band BSF. Flow-Batch Analyzer for the Chemiluminescence Determination of Catecholamines in Pharmaceutical Preparations. ANAL LETT 2011. [DOI: 10.1080/00032719.2010.500765] [Citation(s) in RCA: 18] [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] [Indexed: 10/18/2022]
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Pistonesi MF, Di Nezio MS, Centurión ME, Lista AG, Fragoso WD, Pontes MJ, Araújo MC, Band BSF. Simultaneous determination of hydroquinone, resorcinol, phenol, m-cresol and p-cresol in untreated air samples using spectrofluorimetry and a custom multiple linear regression-successive projection algorithm. Talanta 2010; 83:320-3. [DOI: 10.1016/j.talanta.2010.09.027] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2010] [Revised: 08/27/2010] [Accepted: 09/18/2010] [Indexed: 10/19/2022]
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Acebal CC, Grünhut M, Lista AG, Fernández Band BS. Successive projections algorithm applied to spectral data for the simultaneous determination of flavour enhancers. Talanta 2010; 82:222-6. [DOI: 10.1016/j.talanta.2010.04.024] [Citation(s) in RCA: 6] [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] [Received: 03/12/2010] [Revised: 04/12/2010] [Accepted: 04/14/2010] [Indexed: 11/27/2022]
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Grünhut M, Centurión ME, Fragoso WD, Almeida LF, de Araújo MC, Band BSF. Flow-batch technique for the simultaneous enzymatic determination of levodopa and carbidopa in pharmaceuticals using PLS and successive projections algorithm. Talanta 2008; 75:950-8. [DOI: 10.1016/j.talanta.2007.12.029] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2007] [Revised: 12/18/2007] [Accepted: 12/19/2007] [Indexed: 10/22/2022]
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Llamas NE, Di Nezio MS, Palomeque ME, Fernández Band BS. Direct Determination of Saccharin and Acesulfame-K in Sweeteners and Fruit Juices Powders. FOOD ANAL METHOD 2008. [DOI: 10.1007/s12161-007-9006-z] [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] [Indexed: 11/28/2022]
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Acebal CC, Lista AG, Fernández Band BS. Simultaneous determination of flavor enhancers in stock cube samples by using spectrophotometric data and multivariate calibration. Food Chem 2008. [DOI: 10.1016/j.foodchem.2007.06.009] [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] [Indexed: 11/28/2022]
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Grünhut M, Palomeque ME, Lista AG, Band BSF. Enzymatic reverse FIA method for total phenols determination in urine samples. Talanta 2007; 71:1520-3. [DOI: 10.1016/j.talanta.2006.07.032] [Citation(s) in RCA: 4] [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: 05/04/2006] [Revised: 07/13/2006] [Accepted: 07/14/2006] [Indexed: 11/29/2022]
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Di Nezio MS, Pistonesi MF, Centurión ME, Palomeque ME, Lista AG, Fernández Band BS. A home-made hybrid system for the simultaneous determination of ergotamine, dipyrone and caffeine in pharmaceutical preparations. J BRAZIL CHEM SOC 2007. [DOI: 10.1590/s0103-50532007000700020] [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: 11/22/2022] Open
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Lu W, Fernández Band BS, Yu Y, Geng Li Q, Chuan Shang J, Wang C, Fang Y, Tian R, Ping Zhou L, Li Sun L, Tang Y, Hua Jing S, Huang W, Ping Zhang J. Resonance light scattering and derived techniques in analytical chemistry: past, present, and future. Mikrochim Acta 2006. [DOI: 10.1007/s00604-006-0670-2] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Pistonesi MF, Di Nezio MS, Centurión ME, Palomeque ME, Lista AG, Fernández Band BS. Determination of phenol, resorcinol and hydroquinone in air samples by synchronous fluorescence using partial least-squares (PLS). Talanta 2006; 69:1265-8. [DOI: 10.1016/j.talanta.2005.12.050] [Citation(s) in RCA: 259] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2005] [Revised: 12/28/2005] [Accepted: 12/29/2005] [Indexed: 11/30/2022]
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Nezio MSD, Palomeque ME, Fernández Band BS. A Multi‐Element Flow Injection System for Heavy Metals Determination. ANAL LETT 2006. [DOI: 10.1080/00032710600622373] [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: 10/24/2022]
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Acebal CC, Eugenia Centurión M, Lista AG, Fernández Band BS. Automated Method for the Total Creatinine Determination in Dehydrated Broths. ANAL LETT 2006. [DOI: 10.1080/00032710500477175] [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: 10/24/2022]
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Llamas NE, Di Nezio MS, Palomeque ME, Band BSF. Automated turbidimetric determination of cyclamate in low calorie soft drinks and sweeteners without pre-treatment. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2005.03.044] [Citation(s) in RCA: 11] [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: 11/25/2022]
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Di Nezio MS, Palomeque ME, Band BSF. Automated flow-injection method for cadmium determination with pre-concentration and reagent preparation on-line. QUIM NOVA 2005. [DOI: 10.1590/s0100-40422005000100025] [Citation(s) in RCA: 7] [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: 11/22/2022] Open
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Pistonesi M, Centurión ME, Fernández Band BS, Damiani PC, Olivieri AC. Simultaneous determination of levodopa and benserazide by stopped-flow injection analysis and three-way multivariate calibration of kinetic-spectrophotometric data. J Pharm Biomed Anal 2004; 36:541-7. [PMID: 15522528 DOI: 10.1016/j.jpba.2004.07.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [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: 10/09/2003] [Revised: 06/23/2004] [Accepted: 07/04/2004] [Indexed: 11/25/2022]
Abstract
The simultaneous determination of levodopa and benserazide in pharmaceutical formulations is described, based on the application of multidimensional partial least-squares regression to the kinetic-spectrophotometric data provided by diode-array detection within a stopped-flow injection method where analytes react with periodate. Flow injection parameters were adequately optimized. Accurate analysis is performed with no sample pre-treatment steps, and with minimum experimental effort. Satisfactory recovery results were obtained on a number of synthetic and commercial samples, in the latter case including the comparison with liquid chromatography measurements.
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Affiliation(s)
- Marcelo Pistonesi
- Laboratorio FIA-Química Analítica, Departamento de Química, Universidad Nacional del Sur, Av. Alem 1253, (B8000CPB) Bahía Blanca, Argentina
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Di Nezio MS, Palomeque ME, Fernández Band BS. A sensitive spectrophotometric method for lead determination by flow injection analysis with on-line preconcentration. Talanta 2004; 63:405-9. [DOI: 10.1016/j.talanta.2003.11.012] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2003] [Revised: 11/06/2003] [Accepted: 11/06/2003] [Indexed: 11/25/2022]
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Vidal E, Palomeque ME, Lista AG, Fernández Band BS. Flow injection analysis: Rayleigh light scattering technique for total protein determination. Anal Bioanal Chem 2003; 376:38-41. [PMID: 12734616 DOI: 10.1007/s00216-003-1877-2] [Citation(s) in RCA: 31] [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: 01/21/2003] [Revised: 02/18/2003] [Accepted: 02/20/2003] [Indexed: 11/28/2022]
Abstract
A novel flow injection analysis (FIA) method with Rayleigh light scattering (RLS) detection was developed for the determination of total protein concentrations. This method is based on the weak intensity of RLS of bromothymol blue (BB) (3',3"-dibromothymolsulfonephthalein) which can be enhanced by the addition of protein in weakly acidic solution. A common spectrofluorimeter was used as a detector. It was proved that the application of this method to quantify the total proteins in real samples by using bovine serum albumin was possible. The RLS signal was detected at lambda(ex)= lambda(em)=572 nm. The linear range was 7.0-70.0 microg mL(-1), the detection limit was 3.75 microg mL(-1), the reproducibility was 5.5% (n=7), and the sample throughput was 26 h(-1).
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Affiliation(s)
- Ezequiel Vidal
- FIA Laboratory, Department of Chemistry, Universidad Nacional del Sur, Av. Alem 1253, 8000 Bahía Blanca, Argentina
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Abstract
An automated method to determine captopril (1-[(2S)-3-mercapto-2-methylpropionyl]-L-proline) is proposed. A flow injection manifold based on the indirect biamperometric detection of the captopril by using Fe(III)/Fe(II) as an indicating redox system and a Z-shaped flow-cell configuration, was developed. The calibration curve is linear over the range 0.03-3.6 microg ml(-1) of captopril. The relative standard deviation for the determination of 0.76 microg ml(-1) of captopril is 0.97% (n = 12) and the sample throughput is 69 h(-1). This method was applied to the determination of captopril to commercially available pharmaceutical preparations.
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Affiliation(s)
- Miriam E Palomeque
- Department of Chemistry and Eng Chemistry, FIA Laboratory, Universidad Nacional del Sur, Av Alem 1253, 8000 Bahía Blanca, Argentine
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