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Calmels JJ, Aguilar L, Mancebo-Aracil J, Radivoy G, Domini C, Garrido M, Sánchez MD, Nador F. Novel pH-sensitive catechol dyes synthesised by a three component one-pot reaction. Front Chem 2023; 10:1116887. [PMID: 36704615 PMCID: PMC9871305 DOI: 10.3389/fchem.2022.1116887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 12/27/2022] [Indexed: 01/12/2023] Open
Abstract
The synthesis and characterisation of new dyes based on indolizines bearing catechol groups in their structure is presented. The preparation was carried out through a simple three component one-pot reaction promoted by CuNPs/C, between pyridine-2-carbaldehyde, an aromatic alkyne and a tetrahydroisoquinoline (THIQ) functionalized with catechol groups. The products were isolated in 30%-34% yield, which was considered more than acceptable considering that the catechol hydroxyl groups were not protected prior to reaction. In view of the colour developed by the products and their response to the acidic and basic conditions of the medium, product 3aa was studied by UV-Vis and NMR spectroscopies at different pH values. We concluded that product 3aa suffered two deprotonations at pKa of 4.4 and 9.5, giving three species in a pH range between 2-12, with colours varying from light red to deep orange. The reversibility of the process observed for 3aa at different pH values, together with its changes in colour, make this new family of products attractive candidates to use them as pH indicators.
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Affiliation(s)
- Juan José Calmels
- Instituto de Química del Sur (INQUISUR-CONICET)—Grupo de Nanocatálisis y Síntesis Orgánica del Sur Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Buenos Aires, Argentina
| | - Leandro Aguilar
- Instituto de Química del Sur (INQUISUR-CONICET)—Grupo de Nanocatálisis y Síntesis Orgánica del Sur Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Buenos Aires, Argentina
| | - Juan Mancebo-Aracil
- Instituto de Química del Sur (INQUISUR-CONICET)—Grupo de Nanocatálisis y Síntesis Orgánica del Sur Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Buenos Aires, Argentina
| | - Gabriel Radivoy
- Instituto de Química del Sur (INQUISUR-CONICET)—Grupo de Nanocatálisis y Síntesis Orgánica del Sur Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Buenos Aires, Argentina
| | - Claudia Domini
- Instituto de Química del Sur (INQUISUR-CONICET), Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Argentina
| | - Mariano Garrido
- Instituto de Química del Sur (INQUISUR-CONICET), Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Argentina
| | - Miguel D. Sánchez
- Instituto de Física del Sur (IFISUR-CONICET), Departamento de Física, Universidad Nacional del Sur (UNS), Bahía Blanca, Argentina
| | - Fabiana Nador
- Instituto de Química del Sur (INQUISUR-CONICET)—Grupo de Nanocatálisis y Síntesis Orgánica del Sur Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Buenos Aires, Argentina,*Correspondence: Fabiana Nador,
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2
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Tavani F, Capocasa G, Martini A, Sessa F, Di Stefano S, Lanzalunga O, D'Angelo P. Direct structural and mechanistic insights into fast bimolecular chemical reactions in solution through a coupled XAS/UV–Vis multivariate statistical analysis. Dalton Trans 2021; 50:131-142. [DOI: 10.1039/d0dt03083j] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combined multivariate and theoretical analysis of coupled XAS/UV–Vis data was proven to be an innovative method to obtain direct structural and mechanistic evidence for bimolecular reactions in solution involving organic substrates.
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Affiliation(s)
- Francesco Tavani
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | - Giorgio Capocasa
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | - Andrea Martini
- Dipartimento di Chimica
- Università degli Studi di Torino
- 10125 Torino
- Italy
- The Smart Materials Research Institute
| | - Francesco Sessa
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | | | | | - Paola D'Angelo
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
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3
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Tavani F, Martini A, Capocasa G, Di Stefano S, Lanzalunga O, D'Angelo P. Direct Mechanistic Evidence for a Nonheme Complex Reaction through a Multivariate XAS Analysis. Inorg Chem 2020; 59:9979-9989. [PMID: 32598841 PMCID: PMC8008396 DOI: 10.1021/acs.inorgchem.0c01132] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
![]()
In
this work, we propose a method to directly determine the mechanism
of the reaction between the nonheme complex FeII(tris(2-pyridylmethyl)amine)
([FeII(TPA)(CH3CN)2]2+) and peracetic acid (AcOOH) in CH3CN, working at room
temperature. A multivariate analysis is applied to the time-resolved
coupled energy-dispersive X-ray absorption spectroscopy (EDXAS) reaction
data, from which a set of spectral and concentration profiles for
the reaction key species is derived. These “pure” extracted
EDXAS spectra are then quantitatively characterized by full multiple
scattering (MS) calculations. As a result, structural information
for the elusive reaction intermediates [FeIII(TPA)(κ2-OOAc)]2+ and [FeIV(TPA)(O)(X)]+/2+ is obtained, and it is suggested that X = AcO– in opposition to X = CH3CN. The employed strategy is
promising both for the spectroscopic characterization of reaction
intermediates that are labile or silent to the conventional spectroscopic
techniques, as well as for the mechanistic understanding of complex
redox reactions involving organic substrates. A combined multivariate and theoretical XAS analysis was
proven to be a powerful method to obtain direct evidence for the mechanism
of the reaction between the nonheme complex FeII(tris(2-pyridymethyl)amine)
([FeII(TPA)(CH3CN)2]2+) and peroxyacetic acid. This approach allowed to determine the time
evolution of the concentration profiles for all reaction intermediates
and to quantitatively characterize their structures, suggesting the
sixth coordinating ligand of the nonheme oxo complex [FeIV(TPA)(O)(X)]+/2+ is X = AcO− in
opposition to X = CH3CN.
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Affiliation(s)
- Francesco Tavani
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
| | - Andrea Martini
- Dipartimento di Chimica, Università degli Studi di Torino, Via P. Giuria 7, 10125 Torino, Italy.,The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russia
| | - Giorgio Capocasa
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
| | - Stefano Di Stefano
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
| | - Osvaldo Lanzalunga
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
| | - Paola D'Angelo
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
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4
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Brasca R, Kelterer AM, Maeder M, Alcaráz MR, Culzoni MJ. Quantum chemical computation-based strategy for alternating least squares initialization in multivariate curve resolution analysis of spectral-pH data. Microchem J 2018. [DOI: 10.1016/j.microc.2018.04.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Hisazumi J, Kleinebudde P. In-line monitoring of multi-layered film-coating on pellets using Raman spectroscopy by MCR and PLS analyses. Eur J Pharm Biopharm 2017; 114:194-201. [DOI: 10.1016/j.ejpb.2017.01.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 01/16/2017] [Accepted: 01/16/2017] [Indexed: 10/20/2022]
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6
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Sun H, Guo S, Zhu N, Sang N, Chen Z. In situ determination of multiple polycyclic aromatic hydrocarbons uptake by crop leaf surfaces using multi-way models. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 218:523-529. [PMID: 27431694 DOI: 10.1016/j.envpol.2016.07.032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Revised: 07/12/2016] [Accepted: 07/12/2016] [Indexed: 06/06/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) in the atmosphere can partition into agricultural crops, which poses a potential risk to human health through the food chain. In this study, controlled chamber experiments were conducted to investigate the kinetic uptake of anthracene (Ant), phenanthrene (Phe), fluoranthene (Fla) and pyrene (Pyr), individually or as a mixture, by the leaf surfaces of living soybean and corn seedlings using the excitation-emission matrix (EEM) coupled with three-way parallel factor analysis (PARAFAC) and n-way partial least squares (n-PLS). The four selected PAHs achieved equilibrium between the air and the two living crop leaf surfaces over the 15-day monitoring period. Inter-species and inter-chemical variability existed in terms of the time required to achieve equilibrium, mass transfer coefficients (kAL) and the equilibrated adsorption capacity (EAC), which was mainly attributed to the different lg KOA values among the four PAHs and the variable leaf-wax content between the soybean and corn species. Compared with when the PAHs existed singly, the time required to achieve adsorption equilibrium was longer while the EAC was reduced for each of the four PAHs in a mixture, which was attributed to competitive adsorption among the coexisting components. These findings prove that the novel analytical method provides a novel platform for the in situ characterization of the environmental behaviors of multiple PAHs, with their spectra overlapping, between the air and plant skin. The coexistence of multiple PAHs in the air inhibits their individual uptake capacity by crop leaf skin, but increases the total adsorption of PAHs, potentially reducing crop security and increasing human health risk via the terrestrial food web.
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Affiliation(s)
- Haifeng Sun
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China; Guangzhou Key Laboratory of Environmental Exposure and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Shuai Guo
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China
| | - Na Zhu
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China
| | - Nan Sang
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China.
| | - Zhang Chen
- Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China
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7
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Gonzalez MM, Denofrio MP, García Einschlag FS, Franca CA, Pis Diez R, Erra-Balsells R, Cabrerizo FM. Determining the molecular basis for the pH-dependent interaction between 2'-deoxynucleotides and 9H-pyrido[3,4-b]indole in its ground and electronic excited states. Phys Chem Chem Phys 2015; 16:16547-62. [PMID: 24985024 DOI: 10.1039/c4cp01910e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Interaction between norharmane and three different 2'-deoxynucleotides (dNMP) (2'-deoxyguanosine 5'-monophosphate (dGMP), 2'-deoxyadenosine 5'-monophosphate (dAMP) and 2'-deoxycytidine 5'-monophosphate (dCMP)), in aqueous solution, was studied in the ground state by means of UV-vis and (1)H-NMR spectroscopy and in the first electronic excited state using steady-state and time-resolved fluorescence spectroscopy. In all cases, the norharmane-dNMP interaction dependence on the pH was examined. Possible mechanisms for the interaction of both ground and electronic excited states of norharmane with nucleotides are discussed. Spectroscopic, molecular modeling and chemometric analysis were performed to further characterize the chemical structure of the complexes formed and to get additional information concerning the interaction between dNMPs and norharmane.
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Affiliation(s)
- M Micaela Gonzalez
- CIHIDECAR - CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, 3p, Ciudad Universitaria, (1428) Buenos Aires, Argentina.
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8
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Lust A, Strachan CJ, Veski P, Aaltonen J, Heinämäki J, Yliruusi J, Kogermann K. Amorphous solid dispersions of piroxicam and Soluplus(®): Qualitative and quantitative analysis of piroxicam recrystallization during storage. Int J Pharm 2015; 486:306-14. [PMID: 25843761 DOI: 10.1016/j.ijpharm.2015.03.079] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 03/30/2015] [Accepted: 03/31/2015] [Indexed: 10/23/2022]
Abstract
The conversion of active pharmaceutical ingredient (API) from amorphous to crystalline form is the primary stability issue in formulating amorphous solid dispersions (SDs). The aim of the present study was to carry out qualitative and quantitative analysis of the physical solid-state stability of the SDs of poorly water-soluble piroxicam (PRX) and polyvinyl caprolactam-polyvinyl acetate-polyethylene-glycol graft copolymer (Soluplus(®)). The SDs were prepared by a solvent evaporation method and stored for six months at 0% RH/6 °C, 0% RH/25 °C, 40% RH/25 °C and 75% RH/25 °C. Fourier transform infrared spectroscopy equipped with attenuated total reflection accessory (ATR-FTIR) and Raman spectroscopy were used for characterizing the physical solid-state changes and drug-polymer interactions. The principal component analysis (PCA) and multivariate curve resolution alternating least squares (MCR-ALS) were used for the qualitative and quantitative analysis of Raman spectra collected during storage. When stored at 0% RH/6 °C and at 0% RH/25 °C, PRX in SDs remained in an amorphous form since no recrystallization was observed by ATR-FTIR and Raman spectroscopy. Raman spectroscopy coupled with PCA and MCR-ALS and ATR-FTIR spectroscopy enabled to detect the recrystallization of amorphous PRX in the samples stored at higher humidity.
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Affiliation(s)
- Andres Lust
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014, P.O. Box 56 (Viikinkaari 5E), Finland; Department of Pharmacy, Faculty of Medicine, University of Tartu, Nooruse 1, 50411 Tartu, Estonia.
| | - Clare J Strachan
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014, P.O. Box 56 (Viikinkaari 5E), Finland.
| | - Peep Veski
- Department of Pharmacy, Faculty of Medicine, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
| | - Jaakko Aaltonen
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014, P.O. Box 56 (Viikinkaari 5E), Finland.
| | - Jyrki Heinämäki
- Department of Pharmacy, Faculty of Medicine, University of Tartu, Nooruse 1, 50411 Tartu, Estonia.
| | - Jouko Yliruusi
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014, P.O. Box 56 (Viikinkaari 5E), Finland.
| | - Karin Kogermann
- Department of Pharmacy, Faculty of Medicine, University of Tartu, Nooruse 1, 50411 Tartu, Estonia.
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9
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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] [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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10
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Bortolato SA, McDonough K, Gurney RW, Martino DM. Second order multivariate curve resolution of Fourier transform infrared spectroscopic data of the photo-induced crosslinking of thymine functionalized polymers. Talanta 2014; 127:204-10. [PMID: 24913877 DOI: 10.1016/j.talanta.2014.04.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 04/04/2014] [Accepted: 04/07/2014] [Indexed: 11/30/2022]
Abstract
A meaningful characterization of the photo-induced curing process of materials based on styrene monomers functionalized with thymine and charged ionic groups was accomplished using FT-IR spectroscopy in combination with second-order multivariate calibration algorithms. The polymer composition as well as the irradiation dose effects on the photo-crosslinking of copolymer films was experimentally determined. Each FT-IR absorption spectra was decomposed into the contribution of individual species by means of chemometric algorithms. A second-order strategy involving a three-way array for each sample and analyzing all arrays simultaneously was used. Temperature and solvent frequently have a strong influence on the FT-IR peak producing shifts and trilinearity lost. A new methodology to properly pre-align the spectroscopic matrix data is used based on the decomposition of a three-way array via a suitably initialized and constrained PARAFAC model. The chemical reaction mechanism describing the underlying process in terms of identifiable steps was determined. Associated key parameters and equilibrium rate constants that characterize the interconversion and stability of diverse species were predicted. Additionally, it was possible to quantify all the species even in the presence of a non-calibrated compound.
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Affiliation(s)
- Santiago A Bortolato
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC) (UNL - CONICET) Güemes 3450, S3000GLN Santa Fe, Argentina
| | - Kristin McDonough
- Department of Chemistry and Physics, Simmons College, 300 The Fenway, Boston, MA, 02115, USA
| | - Richard W Gurney
- Department of Chemistry and Physics, Simmons College, 300 The Fenway, Boston, MA, 02115, USA.
| | - Débora M Martino
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC) (UNL - CONICET) Güemes 3450, S3000GLN Santa Fe, Argentina.
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11
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Wu N, Sun KL, Liu Y, Yang XF, Li H. Multivariate curve resolution combined with on-line infrared spectroscopy for researching the synthesis mechanism of 3,4-bis(4′-aminofurazano-3′)furoxan. Chem Res Chin Univ 2013. [DOI: 10.1007/s40242-013-3043-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Omidikia N, Abdollahi H, Kompany-Zareh M. On uniqueness and selectivity in three-component parallel factor analysis. Anal Chim Acta 2013; 782:12-20. [DOI: 10.1016/j.aca.2013.04.033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 04/15/2013] [Accepted: 04/17/2013] [Indexed: 10/26/2022]
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13
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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. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 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] [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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14
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Multi-wavelength spectrophotometric determination of acidity constants of some salicylaldimine derivatives. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2012.10.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Bortolato SA, Thomas KE, McDonough K, Gurney RW, Martino DM. Evaluation of photo-induced crosslinking of thymine polymers using FT-IR spectroscopy and chemometric analysis. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.09.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Ragone F, Ruiz GT, Piro OE, Echeverría GA, Cabrerizo FM, Petroselli G, Erra-Balsells R, Hiraoka K, García Einschlag FS, Wolcan E. Water-Soluble (Pterin)rhenium(I) Complex: Synthesis, Structural Characterization, and Two Reversible Protonation-Deprotonation Behavior in Aqueous Solutions. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200681] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Guo L, Spegazzini N, Sato H, Hashimoto T, Masunaga H, Sasaki S, Takata M, Ozaki Y. Multistep Crystallization Process Involving Sequential Formations of Density Fluctuations, “Intermediate Structures”, and Lamellar Crystallites: Poly(3-hydroxybutyrate) As Investigated by Time-Resolved Synchrotron SAXS and WAXD. Macromolecules 2011. [DOI: 10.1021/ma201475t] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Longhai Guo
- Department of Chemistry, School of Science
and Technology and Research Center of Environmental Friendly Polymer, Kwansei-Gakuin University, Gakuen 2-1, Sanda, Hyogo
669-1545, Japan
| | - Nicolas Spegazzini
- Department of Chemistry, School of Science
and Technology and Research Center of Environmental Friendly Polymer, Kwansei-Gakuin University, Gakuen 2-1, Sanda, Hyogo
669-1545, Japan
| | - Harumi Sato
- Department of Chemistry, School of Science
and Technology and Research Center of Environmental Friendly Polymer, Kwansei-Gakuin University, Gakuen 2-1, Sanda, Hyogo
669-1545, Japan
| | - Takeji Hashimoto
- Department of Chemistry, School of Science
and Technology and Research Center of Environmental Friendly Polymer, Kwansei-Gakuin University, Gakuen 2-1, Sanda, Hyogo
669-1545, Japan
- Professor
Emeritus, Kyoto University, Kyoto 606-8501,
Japan, and Honorary Chair Professor, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198,
Japan
| | - Sono Sasaki
- Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198,
Japan
- Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto
606-8585, Japan
| | - Masaki Takata
- Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198,
Japan
| | - Yukihiro Ozaki
- Department of Chemistry, School of Science
and Technology and Research Center of Environmental Friendly Polymer, Kwansei-Gakuin University, Gakuen 2-1, Sanda, Hyogo
669-1545, Japan
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18
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Fagioli UN, García Einschlag FS, Cobos CJ, Ruiz GT, Féliz MR, Wolcan E. On the Mechanism of Re(I)–Carboxylate Bond Cleavage by Perchloric Acid: A Kinetic and Spectroscopic Study. J Phys Chem A 2011; 115:10979-87. [DOI: 10.1021/jp206328q] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ulises N. Fagioli
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, (1900) La Plata, Argentina
| | - Fernando S. García Einschlag
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, (1900) La Plata, Argentina
| | - Carlos J. Cobos
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, (1900) La Plata, Argentina
| | - Gustavo T. Ruiz
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, (1900) La Plata, Argentina
| | - Mario R. Féliz
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, (1900) La Plata, Argentina
| | - Ezequiel Wolcan
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, (1900) La Plata, Argentina
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On the mechanism of formation and spectral properties of radical anions generated by the reduction of –[ReI(CO)3(5-nitro-1,10-phenanthroline)]+ and –[ReI(CO)3(3,4,7,8-tetramethyl-1,10-phenanthroline)]+ pendants in poly-4-vinylpyridine polymers. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.02.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Shashilov VA, Lednev IK. Advanced statistical and numerical methods for spectroscopic characterization of protein structural evolution. Chem Rev 2011; 110:5692-713. [PMID: 20593900 DOI: 10.1021/cr900152h] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Victor A Shashilov
- Aegis Analytical Corporation, 1380 Forest Park Circle, Suite 200, Lafayette, Colorado 80026, USA
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21
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Pirillo S, Einschlag FSG, Ferreira ML, Rueda EH. Eriochrome Blue Black R and Fluorescein degradation by hydrogen peroxide oxidation with horseradish peroxidase and hematin as biocatalysts. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.molcatb.2010.03.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Pirillo S, García Einschlag FS, Rueda EH, Ferreira ML. Horseradish Peroxidase and Hematin as Biocatalysts for Alizarin Degradation Using Hydrogen Peroxide. Ind Eng Chem Res 2010. [DOI: 10.1021/ie901528y] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Silvina Pirillo
- Departamento de Química, Universidad Nacional del Sur, Avenida Alem 1253, B8000CPB Bahía Blanca, Argentina, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, UNLP, CCT La Plata-CONICET), Diag. 113 y 64, Sucursal 4, C.C. 16, B1900ZAA La Plata, Argentina, and Planta Piloto de Ingeniería Química (PLAPIQUI-UNS-CONICET), Camino a la Carrindanga km 7, B8000CPB Bahía Blanca, Argentina
| | - Fernando Sebastián García Einschlag
- Departamento de Química, Universidad Nacional del Sur, Avenida Alem 1253, B8000CPB Bahía Blanca, Argentina, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, UNLP, CCT La Plata-CONICET), Diag. 113 y 64, Sucursal 4, C.C. 16, B1900ZAA La Plata, Argentina, and Planta Piloto de Ingeniería Química (PLAPIQUI-UNS-CONICET), Camino a la Carrindanga km 7, B8000CPB Bahía Blanca, Argentina
| | - Elsa H. Rueda
- Departamento de Química, Universidad Nacional del Sur, Avenida Alem 1253, B8000CPB Bahía Blanca, Argentina, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, UNLP, CCT La Plata-CONICET), Diag. 113 y 64, Sucursal 4, C.C. 16, B1900ZAA La Plata, Argentina, and Planta Piloto de Ingeniería Química (PLAPIQUI-UNS-CONICET), Camino a la Carrindanga km 7, B8000CPB Bahía Blanca, Argentina
| | - María Luján Ferreira
- Departamento de Química, Universidad Nacional del Sur, Avenida Alem 1253, B8000CPB Bahía Blanca, Argentina, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, UNLP, CCT La Plata-CONICET), Diag. 113 y 64, Sucursal 4, C.C. 16, B1900ZAA La Plata, Argentina, and Planta Piloto de Ingeniería Química (PLAPIQUI-UNS-CONICET), Camino a la Carrindanga km 7, B8000CPB Bahía Blanca, Argentina
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23
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Bracco LL, Einschlag FSG, Wolcan E, Ferraudi GJ. On the mechanism of the photoinduced reduction of an adduct of ferricytochrome C with a poly(4-vinylpyridine) polymer containing –ReI (CO)3(3,4,7,8-tetramethyl-1,10-phenanthroline) pendants. J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2009.08.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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24
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Pérez IS, Culzoni MJ, Siano GG, García MDG, Goicoechea HC, Galera MM. Detection of Unintended Stress Effects Based on a Metabonomic Study in Tomato Fruits after Treatment with Carbofuran Pesticide. Capabilities of MCR-ALS Applied to LC-MS Three-Way Data Arrays. Anal Chem 2009; 81:8335-46. [DOI: 10.1021/ac901119h] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Isidro Sánchez Pérez
- Departamento de Hidrogeología y Química Analítica, Facultad de Ciencias Experimentales, Universidad de Almería, La Cañada de San Urbano, 04120 Almería, Spain, and 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
| | - María J. Culzoni
- Departamento de Hidrogeología y Química Analítica, Facultad de Ciencias Experimentales, Universidad de Almería, La Cañada de San Urbano, 04120 Almería, Spain, and 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
| | - Gabriel G. Siano
- Departamento de Hidrogeología y Química Analítica, Facultad de Ciencias Experimentales, Universidad de Almería, La Cañada de San Urbano, 04120 Almería, Spain, and 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
| | - María D. Gil García
- Departamento de Hidrogeología y Química Analítica, Facultad de Ciencias Experimentales, Universidad de Almería, La Cañada de San Urbano, 04120 Almería, Spain, and 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
| | - Héctor C. Goicoechea
- Departamento de Hidrogeología y Química Analítica, Facultad de Ciencias Experimentales, Universidad de Almería, La Cañada de San Urbano, 04120 Almería, Spain, and 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
| | - María Martínez Galera
- Departamento de Hidrogeología y Química Analítica, Facultad de Ciencias Experimentales, Universidad de Almería, La Cañada de San Urbano, 04120 Almería, Spain, and 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
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25
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Spegazzini N, Ruisánchez I, Larrechi MS. MCR–ALS for sequential estimation of FTIR–ATR spectra to resolve a curing process using global phase angle convergence criterion. Anal Chim Acta 2009; 642:155-62. [DOI: 10.1016/j.aca.2009.02.037] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2008] [Accepted: 02/16/2009] [Indexed: 10/21/2022]
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26
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Chemometric resolution of NIR spectra data of a model aza-Michael reaction with a combination of local rank exploratory analysis and multivariate curve resolution-alternating least squares (MCR-ALS) method. Anal Chim Acta 2009; 642:148-54. [DOI: 10.1016/j.aca.2008.10.071] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Revised: 09/30/2008] [Accepted: 10/28/2008] [Indexed: 11/22/2022]
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27
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Multivariate curve resolution-alternating least squares (MCR-ALS) applied to spectroscopic data from monitoring chemical reactions processes. Anal Bioanal Chem 2008; 390:2059-66. [PMID: 18320174 DOI: 10.1007/s00216-008-1955-6] [Citation(s) in RCA: 150] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2007] [Revised: 01/30/2008] [Accepted: 02/07/2008] [Indexed: 10/22/2022]
Abstract
This paper overviews the application of multivariate curve resolution (optimized by alternating least squares) to spectroscopic data acquired by monitoring chemical reactions and other processes. The goals of the resolution methods and the principles for understanding their applications are described. Some of the problems arising from these evolving systems and the limitations of the multivariate curve resolution methods are also discussed. This article reviews most of the applications of multivariate curve resolution applied to reacting systems published between January 2000 and June 2007. Some basic papers dated before 2000 have also been included.
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Near Infrared Spectroscopy for On-line Monitoring of Alkali- Free Cloth /Phenolic Resin Prepreg During Manufacture. Int J Mol Sci 2007. [DOI: 10.3390/i8060541] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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29
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Shashilov VA, Ermolenkov VV, Lednev IK. Multiple bicyclic diamide-lutetium complexes in solution: chemometric analysis of deep-UV Raman spectroscopic data. Inorg Chem 2007; 45:3606-12. [PMID: 16634592 DOI: 10.1021/ic0600331] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The investigation of complex formation between a bicyclic diamide, a novel chelating agent for lanthanides and actinides, and lutetium in an acetonitrile solution is reported. A free ligand and its lutetium complexes showed weak, noncharacteristic near-UV absorption and no fluorescence, which limited the application of absorption and fluorescence spectroscopies for studying this system. Deep-UV Raman spectroscopy combined with chemometric analysis was shown to be a powerful tool for quantitative characterization of multiple equilibria between lutetium and a bicyclic diamide. Several chemometric methods were utilized for a comparative analysis of Raman spectroscopic data. It was found that a recently developed stepwise maximum angle calculation algorithm followed by alternative least squares (ALS) was more efficient than the commonly used combination of evolving factor analysis and ALS methods, especially when little or no information about the system composition and the spectra of individual components was available. A free ligand and 1:1, 1:2, and 1:3 metal-ligand complexes were distinguished in a bicyclic diamide-lutetium solution. The composition evolution of the solution during the course of titration with lutetium was described, and the stepwise stability constants of complex formation, K(1):K(2) = 0.80 +/- 0.15 (K(1,2) > 10(8) M(-1)) and K(3) = (5.5 +/- 1) x 10(3) M(-1), were estimated.
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Affiliation(s)
- Victor A Shashilov
- Department of Chemistry, University at Albany, State University of New York (SUNY), 1400 Washington Avenue, Albany, New York 12222, USA
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Garrido M, Larrechi MS, Rius FX. Validation of the concentration profiles obtained from the near infrared/multivariate curve resolution monitoring of reactions of epoxy resins using high performance liquid chromatography as a reference method. Anal Chim Acta 2007; 585:277-85. [PMID: 17386675 DOI: 10.1016/j.aca.2007.01.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2006] [Revised: 11/20/2006] [Accepted: 01/09/2007] [Indexed: 11/25/2022]
Abstract
This paper reports the validation of the results obtained by combining near infrared spectroscopy and multivariate curve resolution-alternating least squares (MCR-ALS) and using high performance liquid chromatography as a reference method, for the model reaction of phenylglycidylether (PGE) and aniline. The results are obtained as concentration profiles over the reaction time. The trueness of the proposed method has been evaluated in terms of lack of bias. The joint test for the intercept and the slope showed that there were no significant differences between the profiles calculated spectroscopically and the ones obtained experimentally by means of the chromatographic reference method at an overall level of confidence of 5%. The uncertainty of the results was estimated by using information derived from the process of assessment of trueness. Such operational aspects as the cost and availability of instrumentation and the length and cost of the analysis were evaluated. The method proposed is a good way of monitoring the reactions of epoxy resins, and it adequately shows how the species concentration varies over time.
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Affiliation(s)
- M Garrido
- Department of Analytical and Organic Chemistry, Faculty of Chemistry, Rovira i Virgili University, Marcel-lí Domingo s/n, 43005 Tarragona, Spain
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31
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Garrido M, Larrechi MS, Rius FX, Mercado LA, Galià M. Kinetic analysis of reactions of Si-based epoxy resins by near-infrared spectroscopy, 13C NMR and soft–hard modelling. Anal Chim Acta 2007; 583:392-401. [PMID: 17386572 DOI: 10.1016/j.aca.2006.10.037] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2006] [Revised: 10/18/2006] [Accepted: 10/26/2006] [Indexed: 11/28/2022]
Abstract
Soft- and hard-modelling strategy was applied to near-infrared spectroscopy data obtained from monitoring the reaction between glycidyloxydimethylphenyl silane, a silicon-based epoxy monomer, and aniline. On the basis of the pure soft-modelling approach and previous chemical knowledge, a kinetic model for the reaction was proposed. Then, multivariate curve resolution-alternating least squares optimization was carried out under a hard constraint, that compels the concentration profiles to fulfil the proposed kinetic model at each iteration of the optimization process. In this way, the concentration profiles of each species and the corresponding kinetic rate constants of the reaction, unpublished until now, were obtained. The results obtained were contrasted with 13C NMR. The joint interval test of slope and intercept for detecting bias was not significant (alpha=5%).
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Affiliation(s)
- Mariano Garrido
- Department of Analytical and Organic Chemistry, Rovira i Virgili University, Marcel.lí Domingo s/n, 43007 Tarragona, Spain
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Muñoz G, de Juan A. pH- and time-dependent hemoglobin transitions: a case study for process modelling. Anal Chim Acta 2006; 595:198-208. [PMID: 17606001 DOI: 10.1016/j.aca.2006.11.081] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2006] [Accepted: 11/28/2006] [Indexed: 11/25/2022]
Abstract
The study of the pH- and time-dependent transitions of the hemoglobin is presented as a biochemical problem of interest and as a very complete example of the situations that can be encountered in the modelling of complex processes. Therefore, the aim is two-fold: providing a complete explanation of the biochemical phenomena studied and explaining the modelling strategies used to solve this problem that can be generally applied in processes of different origin. Multivariate curve resolution-alternating least squares (MCR-ALS) is the basic method used to recover the process contributions, expressed as the concentration profile and the pure spectrum of each of the compounds involved. What is the benefit of using multitechnique or multiexperiment data arrangements, how constraints should be selected and applied and how hybrid approaches combining hard- and soft-modelling can allow for the use of a partially known model when available are among the main issues presented.
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Affiliation(s)
- Glòria Muñoz
- Chemometrics Group, Department of Analytical Chemistry, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain
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de Juan A, Tauler R. Multivariate Curve Resolution (MCR) from 2000: Progress in Concepts and Applications. Crit Rev Anal Chem 2006. [DOI: 10.1080/10408340600970005] [Citation(s) in RCA: 396] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Garrido M, Larrechi MS, Rius FX. Multivariate curve resolution-alternating least squares and kinetic modeling applied to near-infrared data from curing reactions of epoxy resins: mechanistic approach and estimation of kinetic rate constants. APPLIED SPECTROSCOPY 2006; 60:174-81. [PMID: 16542569 DOI: 10.1366/000370206776023395] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
This study describes the combination of multivariate curve resolution-alternating least squares with a kinetic modeling strategy for obtaining the kinetic rate constants of a curing reaction of epoxy resins. The reaction between phenyl glycidyl ether and aniline is monitored by near-infrared spectroscopy under isothermal conditions for several initial molar ratios of the reagents. The data for all experiments, arranged in a column-wise augmented data matrix, are analyzed using multivariate curve resolution-alternating least squares. The concentration profiles recovered are fitted to a chemical model proposed for the reaction. The selection of the kinetic model is assisted by the information contained in the recovered concentration profiles. The nonlinear fitting provides the kinetic rate constants. The optimized rate constants are in agreement with values reported in the literature.
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Affiliation(s)
- M Garrido
- Department of Analytical and Organic Chemistry, Faculty of Chemistry, Rovira i Virgili University, Tarragona, Spain
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36
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Garrido M, Larrechi MS, Rius FX, Ronda JC, Cádiz V. Curing reaction of glycidylthioether resins: Kinetic model study by near infrared spectroscopy and multivariate curve resolution. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pola.21585] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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37
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Mercado LA, Galià M, Reina JA, Garrido M, Larrechi MS, Rius FX. Reactivity of silicon-based epoxy monomers as studied by near-infrared spectroscopy and multivariate curve resolution methods. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pola.21254] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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38
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Pasamontes A, Callao M. Sequential injection analysis linked to multivariate curve resolution with alternating least squares. Trends Analyt Chem 2006. [DOI: 10.1016/j.trac.2005.04.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Garrido M, Larrechi MS, Rius FX. Modeling of complex viscosity changes in the curing of epoxy resins from near-infrared spectroscopy and multivariate regression analysis. APPLIED SPECTROSCOPY 2004; 58:1424-1430. [PMID: 15606955 DOI: 10.1366/0003702042641335] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The present study investigates the relationship between the changes in complex viscosity and near-infrared spectra. Principal component regression analysis is applied to a near-infrared data set obtained from the in situ monitoring of the curing of diglycidyl ether of bisphenol A with the diamine 4,4'-diaminodiphenylmethane. The values of complex viscosity obtained by dynamic mechanical analysis during the cure process were used as a reference. The near-infrared spectra recorded throughout the reaction, unlike the univariate data analysis at some wavelengths of the spectra, contain a sufficient amount of information to estimate the complex viscosity. The relationship found was high and the results demonstrate the quality of the fitted model. Also, a simple user-friendly procedure for applying the model, focused on the user, is shown.
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Affiliation(s)
- M Garrido
- Department of Analytical and Organic Chemistry, Faculty of Chemistry, Rovira i Virgili University. Pl. Imperial Tàrraco, 1 (43005), Tarragona, Spain
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