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Optimization enhanced genetic algorithm-support vector regression for the prediction of compound retention indices in gas chromatography. Neurocomputing 2017. [DOI: 10.1016/j.neucom.2016.11.070] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Genetic programming based quantitative structure–retention relationships for the prediction of Kovats retention indices. J Chromatogr A 2015; 1420:98-109. [DOI: 10.1016/j.chroma.2015.09.086] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Revised: 09/25/2015] [Accepted: 09/25/2015] [Indexed: 11/20/2022]
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Yan J, Huang JH, He M, Lu HB, Yang R, Kong B, Xu QS, Liang YZ. Prediction of retention indices for frequently reported compounds of plant essential oils using multiple linear regression, partial least squares, and support vector machine. J Sep Sci 2013; 36:2464-71. [DOI: 10.1002/jssc.201300254] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2013] [Revised: 05/08/2013] [Accepted: 05/11/2013] [Indexed: 11/06/2022]
Affiliation(s)
- Jun Yan
- Research Center of Modernization of Traditional Chinese Medicine; Central South University; Changsha P.R. China
| | - Jian-Hua Huang
- Research Center of Modernization of Traditional Chinese Medicine; Central South University; Changsha P.R. China
| | - Min He
- Research Center of Modernization of Traditional Chinese Medicine; Central South University; Changsha P.R. China
| | - Hong-Bing Lu
- Technology Center of China Tobacco Hunan Industrial Co; Changsha P. R. China
| | - Rui Yang
- Research Center of Modernization of Traditional Chinese Medicine; Central South University; Changsha P.R. China
| | - Bo Kong
- Technology Center of China Tobacco Hunan Industrial Co; Changsha P. R. China
| | - Qing-Song Xu
- School of Mathematical Sciences and Computing Technology; Central South University; Changsha P. R. China
| | - Yi-Zeng Liang
- Research Center of Modernization of Traditional Chinese Medicine; Central South University; Changsha P.R. China
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Cirera-Domènech E, Estrada-Tejedor R, Broto-Puig F, Teixidó J, Gassiot-Matas M, Comellas L, Lliberia JL, Méndez A, Paz-Estivill S, Delgado-Ortiz MR. Quantitative structure-retention relationships applied to liquid chromatography gradient elution method for the determination of carbonyl-2,4-dinitrophenylhydrazone compounds. J Chromatogr A 2012; 1276:65-77. [PMID: 23298845 DOI: 10.1016/j.chroma.2012.12.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 12/13/2012] [Accepted: 12/17/2012] [Indexed: 10/27/2022]
Abstract
A usual method for the determination of aldehydes and ketones in different matrices consists of a derivatization with 2,4-dinitrophenylhydrazine (DNPH) followed by HPLC-UV analysis. In the present work, a HPLC-UV gradient elution method has been applied to the analysis of 13 aldehydes and ketones-DNPH in automotive emission samples. In addition to these 13 compounds-DNPH, several carbonyl-DNPH compounds (linear, ramified and cyclic, saturated and unsaturated compounds) have been analyzed by HPLC-UV. Quantitative structure-retention relationships (QSRR) methods have been applied to predict the logarithm of capacity factor (logk') of carbonyl-DNPH compounds. According to its physicochemical meaning, combinations of 2 and 3 molecular descriptors have been proposed in order to achieve higher correlation with logk'. Using linear and non-linear QSRR methodologies, the resulting prediction models allowed the screening of the most probable carbonyl-DNPH derivative candidates that correspond to unknown compounds detected in automotive emission samples. This information has been useful for their identification by UPLC(®)-MS/MS. In addition, the chromatographic retention of different carbonyl-DNPH compound families was studied using two HPLC isocratic methods working with two orthogonal stationary phases (octadecylpolyethoxysilane and cyanopropyl). Differences between the retention indexes obtained for each column were used for classifying carbonyl-DNPH into compounds families.
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Affiliation(s)
- Elisenda Cirera-Domènech
- Department of Analytical Chemistry, Chromatography Section, IQS (Institut Químic de Sarrià) - Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Catalonia, Spain.
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Yan J, Cao DS, Guo FQ, Zhang LX, He M, Huang JH, Xu QS, Liang YZ. Comparison of quantitative structure–retention relationship models on four stationary phases with different polarity for a diverse set of flavor compounds. J Chromatogr A 2012; 1223:118-25. [DOI: 10.1016/j.chroma.2011.12.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Revised: 12/03/2011] [Accepted: 12/05/2011] [Indexed: 01/22/2023]
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Ghavami R, Faham S. QSRR Models for Kováts' Retention Indices of a Variety of Volatile Organic Compounds on Polar and Apolar GC Stationary Phases Using Molecular Connectivity Indexes. Chromatographia 2010; 72:893-903. [PMID: 21088689 PMCID: PMC2965364 DOI: 10.1365/s10337-010-1741-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Revised: 07/13/2010] [Accepted: 08/02/2010] [Indexed: 11/29/2022]
Abstract
Quantitative structure-retention relationship (QSRR) approaches, based on molecular connectivity indices are useful to predict the gas chromatography of Kováts relative retention indices (GC-RRIs) of 132 volatile organic compounds (VOCs) on different 12 (4 apolar and 8 polar) stationary phases (C67, C103, C78, C∞, POH, TTF, MTF, PCL, PBR, TMO, PSH and PCN) at 130 °C. Full geometry optimization based on Austin model 1 semi-empirical molecular orbital method was carried out. The sets of 30 molecular descriptors were derived directly from the topological structures of the compounds from DRAGON program. By means of the final variable selection method, which is elimination selection stepwise regression algorithms, three optimal descriptors were selected to develop a QSRR model to predict the RRI of organic compounds on each stationary phase with a correlation coefficient between 0.9378 and 0.9673 and a leave-one-out cross-validation correlation coefficient between 0.9325 and 0.9653. The root mean squares errors over different 12 phases were within the range of 0.0333–0.0458. Furthermore, the accuracy of all developed models was confirmed using procedures of Y-randomization, external validation through an odd–even number and division of the entire dataset into training and test sets. A successful interpretation of the complex relationship between GC RRIs of VOCs and the chemical structures was achieved by QSRR. The three connectivity indexes in the models are also rationally interpreted, which indicated that all organic compounds’ RRI was precisely represented by molecular connectivity indexes.
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Affiliation(s)
- Raouf Ghavami
- Department of Chemistry, Faculty of Science, University of Kurdistan, P.O. Box 416, Sanandaj, Iran
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Liao L, Qing D, Li J, Lei G. Structural characterization and Kovats retention index prediction for oxygen-containing organic compounds. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.05.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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8
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Goodner K. Practical retention index models of OV-101, DB-1, DB-5, and DB-Wax for flavor and fragrance compounds. Lebensm Wiss Technol 2008. [DOI: 10.1016/j.lwt.2007.07.007] [Citation(s) in RCA: 137] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Héberger K. Quantitative structure-(chromatographic) retention relationships. J Chromatogr A 2007; 1158:273-305. [PMID: 17499256 DOI: 10.1016/j.chroma.2007.03.108] [Citation(s) in RCA: 268] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Revised: 03/13/2007] [Accepted: 03/19/2007] [Indexed: 01/30/2023]
Abstract
Since the pioneering works of Kaliszan (R. Kaliszan, Quantitative Structure-Chromatographic Retention Relationships, Wiley, New York, 1987; and R. Kaliszan, Structure and Retention in Chromatography. A Chemometric Approach, Harwood Academic, Amsterdam, 1997) no comprehensive summary is available in the field. Present review covers the period of 1996-August 2006. The sources are grouped according to the special properties of kinds of chromatography: Quantitative structure-retention relationship in gas chromatography, in planar chromatography, in column liquid chromatography, in micellar liquid chromatography, affinity chromatography and quantitative structure enantioselective retention relationships. General tendencies, misleading practice and conclusions, validation of the models, suggestions for future works are summarized for each sub-field. Some straightforward applications are emphasized but standard ones. The sources and the model compounds, descriptors, predicted retention data, modeling methods and indicators of their performance, validation of models, and stationary phases are collected in the tables. Some important conclusions are: Not all physicochemical descriptors correlate with the retention data strongly; the heat of formation is not related to the chromatographic retention. It is not appropriate to give the errors of Kovats indices in percentages. The apparently low values (1-3%) can disorient the reviewers and readers. Contemporary mean interlaboratory reproducibility of Kovats indices are about 5-10 i.u. for standard non polar phases and 10-25 i.u. for standard polar phases. The predictive performance of QSRR models deteriorates as the polarity of GC stationary phase increases. The correlation coefficient alone is not a particularly good indicator for the model performance. Residuals are more useful than plots of measured and calculated values. There is no need to give the retention data in a form of an equation if the numbers of compounds are small. The domain of model applicability of models should be given in all cases.
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Affiliation(s)
- Károly Héberger
- Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, H-1525 Budapest, Hungary.
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Affiliation(s)
- A. C. Duarte
- a Departamento de Química , Universidade de Aveiro , Aveiro, Portugal
| | - S. Capelo
- b Departamento de Ecologia , Universidade de Évora , Évora, Portugal
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Zagyi M, Cserháti T. Quantitative Structure‐Retention Relationship Study on the Binding of Organic Solvents to the Corn Protein, Zein. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070601084795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- M. Zagyi
- a Institute of Materials and Environmental Chemistry, Chemical Research Centre, Hungarian Academy of Sciences , Budapest, Hungary
| | - T. Cserháti
- a Institute of Materials and Environmental Chemistry, Chemical Research Centre, Hungarian Academy of Sciences , Budapest, Hungary
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Skapska S, Witkiewicz Z, Bal K. Changes in the order of elution of some organic compounds in high-resolution gas chromatography on polar columns depending on the injection method and water content in the sample. J Chromatogr A 2003; 992:199-203. [PMID: 12735476 DOI: 10.1016/s0021-9673(03)00312-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
During the GC analysis of apple aroma essence using a capillary column with polar stationary phases, i.e., bonded/crosslinked polyethylene glycol (HP-Innowax) and acid-modified polyethylene glycol (FFAP) the phenomenon of changing the elution order of some compounds was observed ("cross-over phenomenon"). The elution order within two pairs of closely eluting compounds: 2-methylbutyl acetate/pentan-3-ol (internal standard) and trans-2-hexen-1-al/2-methylbutan-1-ol differed between samples introduced onto the column with direct injection and with static headspace method. Experiments carried out on standard solutions of investigated compounds in water-acetone mixtures of gradually reduced water ratio (99:1 to 0:100) proved that changes of elution times leading first to co-elution and subsequently to reversion of elution order of compounds within both pairs depended on the amount of water in the injected sample. The same effect was observed while the amount of water was diminished by reducing the sample volume introduced into the column.
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Affiliation(s)
- Sylwia Skapska
- Institute of Agricultural and Food Biotechnology, Rakowiecka 36, 02-532 Warsaw, Poland.
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Quantitative structure–property relationship study of chromatographic retention indices and normal boiling points for oxo compounds using the semi-empirical topological method. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(02)00062-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Morais H, Ramos C, Forgács E, Cserháti T, Oliviera J. Using spectrophotometry and spectral mapping technique for the study of the production of manganese-dependent and manganese-independent peroxidases by Pleurotus ostreatus. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 2002; 50:99-109. [PMID: 11741699 DOI: 10.1016/s0165-022x(01)00169-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The activity of manganese-dependent and manganese-independent peroxidases produced by Pleurotus ostreatus in culture media composed of agro-residues was measured by visible spectrophotometry. The overall enzyme activity and its selectivity were separated by using spectral mapping technique followed by nonlinear mapping. The relationships between the parameters of enzyme production and the composition of culture media and fermentation time was assessed by stepwise regression analysis. Calculations proved that the addition of extract of straw to the culture media significantly decreased the overall production of both enzymes, whereas the selectivity of enzyme production was influenced by amount of potato extract and the concentration of total sugar in the culture media. Enzyme activity depended quadratically on the fermentation time.
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Affiliation(s)
- Helena Morais
- National Agronomical Station, Quinta do Marques, 2784-505 Oeiras, Portugal
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Körtvélyesi T, Görgényi M, Héberger K. Correlation between retention indices and quantum-chemical descriptors of ketones and aldehydes on stationary phases of different polarity. Anal Chim Acta 2001. [DOI: 10.1016/s0003-2670(00)01220-4] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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