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Folli GS, de Paulo EH, Santos FD, Nascimento MHC, da Cunha PHP, Romão W, Filgueiras PR. Correlation analysis of modern analytical data - a chemometric dissection of spectral and chromatographic variables. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:4119-4133. [PMID: 37622198 DOI: 10.1039/d3ay00711a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Abstract
The Standard Practices for Infrared Multivariate Quantitative Analysis (ASTM E1655) provide a guide for determining physicochemical properties of materials using multivariate calibration techniques applied to chemical sources that have high multicollinearity and correlated information. Partial least squares (PLS) is the most widely used multivariate regression method due to its excellent prediction capabilities and easy optimization. Initially applied to chromatographic data, PLS has also shown great results in near-infrared (NIR) and mid-infrared (MIR) spectroscopies. However, complex chemical matrices with low correlation may not be efficiently modeled using PLS or other multivariate analyses limited by grouping similar information (such as latent variables or principal components). Therefore, this study aims to evaluate the multicollinearity of different analytical techniques, such as high-temperature gas chromatography (HTGC), NIR, MIR, hydrogen nuclear magnetic resonance (1H NMR), carbon-13 nuclear magnetic resonance (13C NMR), and Fourier transform ion cyclotron resonance mass spectrometry coupled to the electrospray source in positive and negative ionization modes (ESI(±)FT-ICR). Descriptive statistics (coefficient of determination, R2) and principal component analysis (PCA) were used to identify the distribution of correlated information. Results showed that NIR and MIR spectroscopies exhibited a higher percentage of correlated variables, while 13C NMR and ESI(±)FT-ICR MS had more discrete profiles. Therefore, PLS development may be more effectively applied to NIR, MIR, and 1H NMR data, while 13C NMR and mass spectra may require other algorithms or variable selection methods in combination with PLS.
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Affiliation(s)
- Gabriely S Folli
- Laboratory of Chemometrics, Center of Competence in Petroleum Chemistry - NCQP, Laboratory of Research and Development of Methodologies for Analysis of Oils - LabPetro, Exact Sciences Center, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo 29075-910, Brazil.
| | - Ellisson H de Paulo
- Laboratory of Chemometrics, Center of Competence in Petroleum Chemistry - NCQP, Laboratory of Research and Development of Methodologies for Analysis of Oils - LabPetro, Exact Sciences Center, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo 29075-910, Brazil.
| | - Francine D Santos
- Laboratory of Chemometrics, Center of Competence in Petroleum Chemistry - NCQP, Laboratory of Research and Development of Methodologies for Analysis of Oils - LabPetro, Exact Sciences Center, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo 29075-910, Brazil.
| | - Márcia H C Nascimento
- Laboratory of Chemometrics, Center of Competence in Petroleum Chemistry - NCQP, Laboratory of Research and Development of Methodologies for Analysis of Oils - LabPetro, Exact Sciences Center, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo 29075-910, Brazil.
| | - Pedro H P da Cunha
- Laboratory of Chemometrics, Center of Competence in Petroleum Chemistry - NCQP, Laboratory of Research and Development of Methodologies for Analysis of Oils - LabPetro, Exact Sciences Center, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo 29075-910, Brazil.
| | - Wanderson Romão
- Laboratory of Chemometrics, Center of Competence in Petroleum Chemistry - NCQP, Laboratory of Research and Development of Methodologies for Analysis of Oils - LabPetro, Exact Sciences Center, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo 29075-910, Brazil.
- Federal Institute of Education, Science, and Technology of Espírito Santo, Vila Velha, Espírito Santo 29106-010, Brazil
| | - Paulo R Filgueiras
- Laboratory of Chemometrics, Center of Competence in Petroleum Chemistry - NCQP, Laboratory of Research and Development of Methodologies for Analysis of Oils - LabPetro, Exact Sciences Center, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo 29075-910, Brazil.
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Thermal Oxidative Stability of Biodiesel/Petrodiesel Blends by Pressurized Differential Scanning Calorimetry and Its Calculated Cetane Index. Processes (Basel) 2021. [DOI: 10.3390/pr9010174] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Diesel fuel mixtures with high concentrations of biodiesel have been investigated to analyze the technical feasibility of their use in diesel cycle engines regarding thermal and oxidative properties. The results of combined techniques of oxidative stability, high Pressurized Differential Scanning Calorimetry (P-DSC), Calculated Cetane Index (CCI), and calorific power were used to verify the effect of the thermal-oxidative stability as a function of the percentage of biodiesel in the mixtures. The obtained results evidenced that the thermal and oxidative stability decreased with the addition of biodiesel from 50 to 5% v/v. Low stability fuels require rapid use as the oxidation compounds degrade the product and impair vehicle performance, as well as lead to corrosion and clogging problems in various mechanical systems.
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Zhang L, Huang X, Fan X, He W, Yang C, Wang C. Rapid fingerprinting technology of heavy oil spill by mid-infrared spectroscopy. ENVIRONMENTAL TECHNOLOGY 2021; 42:270-278. [PMID: 31169447 DOI: 10.1080/09593330.2019.1626913] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 05/29/2019] [Indexed: 06/09/2023]
Abstract
With the increase of unconventional oil production and transportation, the detection methods of light crude oil have been challenged. Mid-Infrared spectroscopy can reflect the functional group of the oil related samples, which has strong absorption signals with distinguishable peaks featured as a fast, economy, and robust technique. Nevertheless, the previous study and application of oil relevant samples, such as petroleum chemical industry online monitoring, are mainly based on Near-infrared spectroscopy. Recently, the rapid development of the spectral instrument manufacturing and the data analysis methods provides a more comprehensive technical support for the rapid and accurate identification of marine oil spill by Mid-infrared spectroscopy. In this paper, 10 crude oil samples were selected for infrared spectroscopy detection, and the results were analysed and compared with those of gas chromatography flame ionization detection method. The character information of the IR spectra and GC/FID chromatograms were extracted and classified both by principal component analysis and partial least squares regression. Under the condition of small sample size, the recognition accuracy was up to 100%. The results show that the mid-infrared method combined with chemometrics can be expected to achieve rapid, accurate and economical identification of heavy oil species.
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Affiliation(s)
- Lujun Zhang
- Department of Physics and Optoelectronic Engineering, Weifang University, Weifang, People's Republic of China
| | - Xiaodong Huang
- Department of Physics and Optoelectronic Engineering, Weifang University, Weifang, People's Republic of China
| | - Xinmin Fan
- Department of Physics and Optoelectronic Engineering, Weifang University, Weifang, People's Republic of China
| | - Weidong He
- Department of Physics and Optoelectronic Engineering, Weifang University, Weifang, People's Republic of China
| | - Chun Yang
- Emergencies Science and Technology Section, Science and Technology Branch, Environment Canada, Ottawa, Canada
| | - Chunyan Wang
- Department of Physics and Optoelectronic Engineering, Weifang University, Weifang, People's Republic of China
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Mesko MF, Balbinot FP, Scaglioni PT, Nascimento MS, Picoloto RS, da Costa VC. Determination of halogens and sulfur in honey: a green analytical method using a single analysis. Anal Bioanal Chem 2020; 412:6475-6484. [PMID: 32394040 DOI: 10.1007/s00216-020-02636-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/24/2020] [Accepted: 04/01/2020] [Indexed: 12/26/2022]
Abstract
The halogen determination is important in view of their biological and environmental roles, but their determination has still been considered a challenge, especially at low concentrations. Therefore, a method for honey decomposition using microwave-induced combustion (MIC) combined with ion chromatography and conductimetric detection (for Cl, F, and S determination) or mass detection (for Br and I determination) (IC-CD-MS) is proposed. Trueness was evaluated by adding reference materials (RMs) or a standard solution in the sample. By using 50 mmol L-1 NH4OH as the absorbing solution, recoveries for all analytes were between 94 and 103%, in both tests. Moreover, no statistical difference (t test, confidence level of 95%) was observed for the results obtained by IC in comparison with those obtained by inductively coupled plasma optical emission spectroscopy (Cl and S) and by inductively coupled plasma mass spectrometry (Br and I). Finally, the proposed method was applied to 19 honey samples from different origins. The concentrations ranged from < 0.45 to 2.39 mg kg-1 (Br), 21.8 to 671 mg kg-1 (Cl), and 11 to 154 mg kg-1 (S), while the F and I concentrations were below that their quantification limits (LOQs) in all analyzed samples. The LOQs for Br, Cl, F, I, and S were 0.45, 21, 3.7, 0.077, and 8.7 mg kg-1, respectively. The MIC method provided a compatible solution to IC for the halogen and S determination in honey by a single analysis. Graphical abstract.
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Affiliation(s)
- Marcia F Mesko
- Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Capão do Leão, RS, 96160-000, Brazil.
| | - Fernanda P Balbinot
- Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Capão do Leão, RS, 96160-000, Brazil
| | - Priscila T Scaglioni
- Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Capão do Leão, RS, 96160-000, Brazil
| | - Mariele S Nascimento
- Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - Rochele S Picoloto
- Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - Vanize C da Costa
- Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Capão do Leão, RS, 96160-000, Brazil
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Tjabadi E, Mketo N. Recent developments for spectrometric, chromatographic and electroanalytical determination of the total sulphur and halogens in various matrices. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2019.05.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Anteneh YS, Franco CMM. Whole Cell Actinobacteria as Biocatalysts. Front Microbiol 2019; 10:77. [PMID: 30833932 PMCID: PMC6387938 DOI: 10.3389/fmicb.2019.00077] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2018] [Accepted: 01/15/2019] [Indexed: 12/25/2022] Open
Abstract
Production of fuels, therapeutic drugs, chemicals, and biomaterials using sustainable biological processes have received renewed attention due to increasing environmental concerns. Despite having high industrial output, most of the current chemical processes are associated with environmentally undesirable by-products which escalate the cost of downstream processing. Compared to chemical processes, whole cell biocatalysts offer several advantages including high selectivity, catalytic efficiency, milder operational conditions and low impact on the environment, making this approach the current choice for synthesis and manufacturing of different industrial products. In this review, we present the application of whole cell actinobacteria for the synthesis of biologically active compounds, biofuel production and conversion of harmful compounds to less toxic by-products. Actinobacteria alone are responsible for the production of nearly half of the documented biologically active metabolites and many enzymes; with the involvement of various species of whole cell actinobacteria such as Rhodococcus, Streptomyces, Nocardia and Corynebacterium for the production of useful industrial commodities.
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Affiliation(s)
- Yitayal Shiferaw Anteneh
- College of Medicine and Public Health, Medical Biotechnology, Flinders University, Bedford Park, SA, Australia
- Department of Medical Microbiology, College of Medicine, Addis Ababa University, Addis Ababa, Ethiopia
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Near-infrared spectroscopy coupled chemometric algorithms for prediction of antioxidant activity of black goji berries (Lycium ruthenicum Murr.). JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2018. [DOI: 10.1007/s11694-018-9853-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Ferreira P, Sousa SF, Fernandes PA, Ramos MJ. Improving the Catalytic Power of the DszD Enzyme for the Biodesulfurization of Crude Oil and Derivatives. Chemistry 2017; 23:17231-17241. [PMID: 28976031 DOI: 10.1002/chem.201704057] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Indexed: 12/18/2022]
Abstract
The enhancement of the catalytic power of enzymes is a subject of enormous interest both for science and for industry. The latter, in particular, due to the vast applications enzymes can have in industrial processes, for instance in the desulfurization of crude oil, which is mandatory by law in many developed countries and is currently performed using costly chemical processes. In this work we sought to enhance the turnover rate of DszD from Rhodococcus erythropolis, a NADH-FMN oxidoreductase responsible for supplying FMNH2 to DszA and DszC in the biodesulfurization process of crude oil, the 4S pathway. For this purpose, we replaced the wild type spectator residue of the rate limiting step of the reduction of FMN to FMNH2 , a process catalysed by DszD and known to play an important role in the reaction energy profile. As replacements, we used all the naturally occurring amino acids, one at a time, using computational methodologies, and repeated the above-mentioned reaction with each mutant. To calculate the different free energy profiles, one for each mutated model, we applied quantum mechanics/molecular mechanics (QM/MM) methods within an ONIOM scheme. The free energy barriers obtained varied between 15.1 and 29.9 kcal mol-1 . Multiple factors contributed to the different ΔG values. The most relevant were electrostatic interactions and the induction of a favourable alignment between substrate and cofactor. These results confirm the great potential that chirurgic mutations have for increasing the catalytic power of DszD in relation to the wild type (wt) enzyme.
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Affiliation(s)
- Pedro Ferreira
- UCIBIO, REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007, Porto, Portugal
| | - Sérgio F Sousa
- UCIBIO, REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007, Porto, Portugal
| | - Pedro A Fernandes
- UCIBIO, REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007, Porto, Portugal
| | - Maria João Ramos
- UCIBIO, REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007, Porto, Portugal
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Yang Y, Wang L, Wu Y, Liu X, Bi Y, Xiao W, Chen Y. On-line monitoring of extraction process of Flos Lonicerae Japonicae using near infrared spectroscopy combined with synergy interval PLS and genetic algorithm. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 182:73-80. [PMID: 28399500 DOI: 10.1016/j.saa.2017.04.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2016] [Revised: 03/18/2017] [Accepted: 04/05/2017] [Indexed: 05/21/2023]
Abstract
There is a growing need for the effective on-line process monitoring during the manufacture of traditional Chinese medicine to ensure quality consistency. In this study, the potential of near infrared (NIR) spectroscopy technique to monitor the extraction process of Flos Lonicerae Japonicae was investigated. A new algorithm of synergy interval PLS with genetic algorithm (Si-GA-PLS) was proposed for modeling. Four different PLS models, namely Full-PLS, Si-PLS, GA-PLS, and Si-GA-PLS, were established, and their performances in predicting two quality parameters (viz. total acid and soluble solid contents) were compared. In conclusion, Si-GA-PLS model got the best results due to the combination of superiority of Si-PLS and GA. For Si-GA-PLS, the determination coefficient (Rp2) and root-mean-square error for the prediction set (RMSEP) were 0.9561 and 147.6544μg/ml for total acid, 0.9062 and 0.1078% for soluble solid contents, correspondingly. The overall results demonstrated that the NIR spectroscopy technique combined with Si-GA-PLS calibration is a reliable and non-destructive alternative method for on-line monitoring of the extraction process of TCM on the production scale.
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Affiliation(s)
- Yue Yang
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Lei Wang
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yongjiang Wu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xuesong Liu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuan Bi
- Jiangsu Kanion Pharmaceutical Co., Ltd., Lianyungang 222001, China
| | - Wei Xiao
- Jiangsu Kanion Pharmaceutical Co., Ltd., Lianyungang 222001, China
| | - Yong Chen
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China.
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Sousa SF, Sousa JFM, Barbosa ACC, Ferreira CE, Neves RPP, Ribeiro AJM, Fernandes PA, Ramos MJ. Improving the Biodesulfurization of Crude Oil and Derivatives: A QM/MM Investigation of the Catalytic Mechanism of NADH-FMN Oxidoreductase (DszD). J Phys Chem A 2016; 120:5300-6. [DOI: 10.1021/acs.jpca.6b01536] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sérgio F. Sousa
- UCIBIO, REQUIMTE, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
| | - Joana F. M. Sousa
- UCIBIO, REQUIMTE, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
| | - Ana C. C. Barbosa
- UCIBIO, REQUIMTE, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
| | - Cleide E. Ferreira
- UCIBIO, REQUIMTE, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
| | - Rui P. P. Neves
- UCIBIO, REQUIMTE, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
| | - António J. M. Ribeiro
- UCIBIO, REQUIMTE, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
| | - Pedro A. Fernandes
- UCIBIO, REQUIMTE, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
| | - Maria João Ramos
- UCIBIO, REQUIMTE, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
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Comparison between ATR-IR, Raman, concatenated ATR-IR and Raman spectroscopy for the determination of total antioxidant capacity and total phenolic content of Chinese rice wine. Food Chem 2016; 194:671-9. [DOI: 10.1016/j.foodchem.2015.08.071] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 08/11/2015] [Accepted: 08/18/2015] [Indexed: 11/21/2022]
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Marques Junior JM, Muller ALH, Foletto EL, da Costa AB, Bizzi CA, Irineu Muller E. Determination of propranolol hydrochloride in pharmaceutical preparations using near infrared spectrometry with fiber optic probe and multivariate calibration methods. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2015; 2015:795102. [PMID: 25861516 PMCID: PMC4377514 DOI: 10.1155/2015/795102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 01/19/2015] [Accepted: 02/13/2015] [Indexed: 06/04/2023]
Abstract
A method for determination of propranolol hydrochloride in pharmaceutical preparation using near infrared spectrometry with fiber optic probe (FTNIR/PROBE) and combined with chemometric methods was developed. Calibration models were developed using two variable selection models: interval partial least squares (iPLS) and synergy interval partial least squares (siPLS). The treatments based on the mean centered data and multiplicative scatter correction (MSC) were selected for models construction. A root mean square error of prediction (RMSEP) of 8.2 mg g(-1) was achieved using siPLS (s2i20PLS) algorithm with spectra divided into 20 intervals and combination of 2 intervals (8501 to 8801 and 5201 to 5501 cm(-1)). Results obtained by the proposed method were compared with those using the pharmacopoeia reference method and significant difference was not observed. Therefore, proposed method allowed a fast, precise, and accurate determination of propranolol hydrochloride in pharmaceutical preparations. Furthermore, it is possible to carry out on-line analysis of this active principle in pharmaceutical formulations with use of fiber optic probe.
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Affiliation(s)
| | | | - Edson Luiz Foletto
- Departamento de Engenharia Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Adilson Ben da Costa
- Departamento de Biologia e Farmácia, Laboratório de Limnologia, Universidade de Santa Cruz do Sul, 96815-900 Santa Cruz do Sul, RS, Brazil
| | - Cezar Augusto Bizzi
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Edson Irineu Muller
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
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Muller ALH, Picoloto RS, Guimaraes RCL, Guarnieri RA, Ferreira BMS, Dias JCM, Santos MFP, Flores EMM, Muller EI. Determination of Basic Nitrogen in Residues of Crude Oil Distillation Using ATR-FTIR and Chemometric Methods. ANAL LETT 2013. [DOI: 10.1080/00032719.2013.828299] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Wang S, Zhang Z, Ning J, Ren G, Yan S, Wan X. Back Propagation-Artificial Neural Network Model for Prediction of the Quality of Tea Shoots through Selection of Relevant Near Infrared Spectral Data via Synergy Interval Partial Least Squares. ANAL LETT 2013. [DOI: 10.1080/00032719.2012.706848] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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