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Hindam FT, Eltanany BM, Abou Al Alamein AM, El Nashar RM, Arafa RM. A voltammetric method coupled with chemometrics for determination of a ternary antiparkinson mixture in its dosage form: greenness assessment. BMC Chem 2024; 18:90. [PMID: 38725000 PMCID: PMC11080133 DOI: 10.1186/s13065-024-01189-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 04/16/2024] [Indexed: 05/12/2024] Open
Abstract
An electroanalytical methodology was developed by direct differential pulse voltammetric (DPV) measurement of Levodopa (LD), Carbidopa (CD) and Entacapone (ENT) mixture using bare glassy carbon electrode (GCE) in Britton Robinson (BR) buffer (pH = 2.0). A multivariate calibration model was then applied to the exported preprocessed voltammetric data using partial least square (PLS) as a chemometric tool. Additionally, the model was cross-validated and the number of latent variables (LVs) were determined to produce a reliable model for simultaneous quantitation of the three drugs either in their synthetic mixtures or in their marketed pharmaceutical formulation with high accuracy and precision. Data preprocessing was used to tackle the problem of lacking bi-linearity which is commonly found in electrochemical data. The proposed chemometric model was able to provide fast and reliable technique for quantitative determination of antiparkinson drugs in their dosage forms. This was successfully achieved by utilizing sixteen mixtures as calibration set and nine mixtures as validation set. The percent recoveries for LD, CD and ENT were found to be 100.05% ± 1.28%, 100.04% ± 0.53% and 99.99% ± 1.25%, respectively. The obtained results of the proposed method were statistically compared to those of a previously reported High Performance Liquid Chromatography (HPLC) methodology. Finally, the presented analytical method strongly supports green analytical chemistry regarding the minimization of potentially dangerous chemicals and solvents, as well as reducing energy utilization and waste generation.
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Affiliation(s)
| | - Basma M Eltanany
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, P.O. Box 11562, Cairo, Egypt
| | - Amal M Abou Al Alamein
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, P.O. Box 11562, Cairo, Egypt
| | - Rasha M El Nashar
- Chemistry Department, Faculty of Science, Cairo University, P.O. Box 12613, Giza, Egypt
| | - Reham M Arafa
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, P.O. Box 11562, Cairo, Egypt.
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Palladino P, Rainetti A, Lettieri M, Pieraccini G, Scarano S, Minunni M. Quantitative Colorimetric Sensing of Carbidopa in Anti-Parkinson Drugs Based on Selective Reaction with Indole-3-Carbaldehyde. SENSORS (BASEL, SWITZERLAND) 2023; 23:9142. [PMID: 38005530 PMCID: PMC10674578 DOI: 10.3390/s23229142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 11/09/2023] [Accepted: 11/11/2023] [Indexed: 11/26/2023]
Abstract
The quality of life of patients affected by Parkinson's disease is improved by medications containing levodopa and carbidopa, restoring the dopamine concentration in the brain. Accordingly, the affordable quality control of such pharmaceuticals is very important. Here is reported the simple and inexpensive colorimetric quantification of carbidopa in anti-Parkinson drugs by the selective condensation reaction between the hydrazine group from carbidopa and the formyl functional group of selected aldehydes in acidified hydroalcoholic solution. An optical assay was developed by using indole-3-carbaldehyde (I3A) giving a yellow aldazine in EtOH:H2O 1:1 (λmax~415 nm) at 70 °C for 4 h, as confirmed by LC-MS analysis. A filter-based plate reader was used for colorimetric data acquisition, providing superior results in terms of analytical performances for I3A, with a sensitivity ~50 L g-1 and LOD ~0.1 mg L-1 in comparison to a previous study based on vanillin, giving, for the same figures of merit values, about 13 L g-1 and 0.2-0.3 mg L-1, respectively. The calibration curves for the standard solution and drugs were almost superimposable, therefore excluding interference from the excipients and additives, with very good reproducibility (avRSD% 2-4%) within the linear dynamic range (10 mg L-1-50 mg L-1).
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Affiliation(s)
- Pasquale Palladino
- Department of Chemistry ‘Ugo Schiff’, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Alberto Rainetti
- Department of Chemistry ‘Ugo Schiff’, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Mariagrazia Lettieri
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Via Aldo Moro, 2, 53100 Siena, Italy
| | - Giuseppe Pieraccini
- CISM Mass Spectrometry Centre, University of Florence, Viale Gaetano Pieraccini 6, 50139 Florence, Italy
| | - Simona Scarano
- Department of Chemistry ‘Ugo Schiff’, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Maria Minunni
- Department of Pharmacy, University of Pisa, Via Bonanno Pisano, 6, 56126 Pisa, Italy
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da Silva EP, Araujo MDS, Kunita MH, Matos R, Medeiros RA. Electrochemical Sensor Based on Multi-Walled Carbon Nanotubes and N-Doped TiO 2 Nanoparticles for Voltametric Simultaneous Determination of Benserazide and Levodopa. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27238614. [PMID: 36500705 PMCID: PMC9739556 DOI: 10.3390/molecules27238614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 11/28/2022] [Accepted: 12/01/2022] [Indexed: 12/12/2022]
Abstract
An electrochemical sensor for simultaneous determination of Benserazide (BEZ) and levodopa (L-dopa) was successfully developed using a glassy carbon electrode (GCE) modified with multi-walled carbon nanotube and nitrogen-doped titanium dioxide nanoparticles (GCE/MWCNT/N-TiO2). Cyclic voltammetry and square wave voltammetry were employed to investigate the electrochemical behavior of different working electrodes and analytes. In comparison with unmodified GCE, the modified electrode exhibited better electrocatalytic activity towards BEZ and L-dopa and was efficient in providing a satisfactory separation for oxidation peaks, with a potential difference of 140 mV clearly allows the simultaneous determination of these compounds. Under the optimized conditions, linear ranges of 2.0-20.0 and 2.0-70.0 μmol L-1 were obtained for BEZ and L-dopa, respectively, with a limit of detection of 1.6 µmol L-1 for BEZ and 2.0 µmol L-1 for L-dopa. The method was applied in simultaneous determination of the analytes in pharmaceutical samples, and the accuracy was attested by comparison with HPLC-DAD as the reference method, with a relative error lower than 4.0%.
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Affiliation(s)
| | | | - Marcos H. Kunita
- Department of Chemistry, State University of Maringá, Maringá 87020-900, PR, Brazil
| | - Roberto Matos
- Department of Chemistry, State University of Londrina, Londrina 86057-970, PR, Brazil
| | - Roberta Antigo Medeiros
- Department of Chemistry, State University of Londrina, Londrina 86057-970, PR, Brazil
- Correspondence: ; Tel.: +55-43-33714811
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Lettieri M, Scarano S, Palladino P, Minunni M. Colorimetric determination of carbidopa in anti-Parkinson drugs based on 4-hydroxy-3-methoxybenzaldazine formation by reaction with vanillin. Anal Bioanal Chem 2022; 414:6911-6918. [PMID: 35927364 PMCID: PMC9436860 DOI: 10.1007/s00216-022-04256-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/28/2022] [Accepted: 07/27/2022] [Indexed: 11/29/2022]
Abstract
In this paper is reported the selective colorimetric detection and quantification of carbidopa, an inhibitor of aromatic amino acid decarboxylase, in the co-presence of levodopa as dopamine precursor in pharmaceutical formulations for the treatment of Parkinson's disease. The method is based on the selective condensation reaction between the hydrazine group from carbidopa and the formyl functional group of vanillin, a natural flavoring agent, in acidified alcoholic solution. The yellow color development (λmax ~ 420 nm) due to the formation of 4-hydroxy-3-methoxybenzaldazine (HMOB) was observed for carbidopa only, whereas levodopa, lacking the hydrazine group, did not color the solution, as expected. The calibration curves for two tablet formulations of levodopa in combination with carbidopa (4:1) were superimposable with levodopa/carbidopa (4:1), as well as carbidopa alone, in standard solution, i.e., the excipients and additives did not interfere with carbidopa determination, corresponding to a mean recovery about 105%. The linear dynamic range was between 5.00 and 50.0 mg L-1 with very good reproducibility within this range (CVav% about 3-4%) and very good sensitivity, with limits of quantification of about 1 mg L-1. The colorimetric method developed here is very simple, inexpensive, and effective for drug estimation and quality control of pharmaceutical formulations.
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Affiliation(s)
- Mariagrazia Lettieri
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Simona Scarano
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Pasquale Palladino
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy.
| | - Maria Minunni
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
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Lettieri M, Emanuele R, Scarano S, Palladino P, Minunni M. Melanochrome-based colorimetric assay for quantitative detection of levodopa in co-presence of carbidopa and its application to relevant anti-Parkinson drugs. Anal Bioanal Chem 2021; 414:1713-1722. [PMID: 34842945 DOI: 10.1007/s00216-021-03804-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 11/16/2021] [Accepted: 11/24/2021] [Indexed: 12/11/2022]
Abstract
In this paper is reported the selective detection and quantification of levodopa in co-presence of carbidopa. The method took advantage of the spontaneous oxidation and color development of levodopa at basic pH here driven by alkaline earth cations and co-solvent in solution. We have shown for the first time the generation and stabilization of the purple melanochrome from levodopa, by using magnesium acetate and dimethyl sulfoxide, which was here exploited for the development of a quantitative colorimetric assay for the active principle ingredient in commercial drugs for the treatment of Parkinson's disease. The calibration curves of levodopa in the two tablet formulations, containing carbidopa as decarboxylase inhibitor, showed a common linear trend between 10 mg L-1 and 40 mg L-1 with levodopa alone or in combination with carbidopa in standard solutions, with very good reproducibility (CVav%, 3.3% for both brand and generic drug) and very good sensitivity, with limit of quantification about 0.6 mg L-1 in any case. The colorimetric method here developed is very simple and effective, appearing as a rapid and low-cost alternative to other methodologies, involving large and expensive instrumentations, for drug estimation and quality control of pharmaceutical formulations.
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Affiliation(s)
- Mariagrazia Lettieri
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Roberta Emanuele
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Simona Scarano
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Pasquale Palladino
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy.
| | - Maria Minunni
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
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The Determination of Parkinson's Drugs in Human Urine by Applying Chemometric Methods. Int J Anal Chem 2019; 2019:7834362. [PMID: 31360168 PMCID: PMC6652062 DOI: 10.1155/2019/7834362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 06/10/2019] [Accepted: 06/20/2019] [Indexed: 11/17/2022] Open
Abstract
The spectrophotometric-chemometric analysis of levodopa and carbidopa that are used for Parkinson's disease was analyzed without any prior reservation. Parkinson's drugs in the urine sample of a healthy person (never used drugs in his life) were analyzed at the same time spectrophotometrically. The chemometric methods used were partial least squares regression (PLS) and principal component regression (PCR). PLS and PCR were successfully applied as chemometric determination of levodopa and carbidopa in human urine samples. A concentration set including binary mixtures of levodopa and carbidopa in 15 different combinations was randomly prepared in acetate buffer (pH 3.5).). UV spectrophotometry is a relatively inexpensive, reliable, and less time-consuming method. Minitab program was used for absorbance and concentration values. The normalization values for each active substance were good (r2>0.9997). Additionally, experimental data were validated statistically. The results of the analyses of the results revealed high recoveries and low standard deviations. Hence, the results encouraged us to apply the method to drug analysis. The proposed methods are highly sensitive and precise, and therefore they were implemented for the determination of the active substances in the urine sample of a healthy person in triumph.
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Abdel-Ghany MF, Hussein LA, Ayad MF, Youssef MM. Investigation of different spectrophotometric and chemometric methods for determination of entacapone, levodopa and carbidopa in ternary mixture. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 171:236-245. [PMID: 27541796 DOI: 10.1016/j.saa.2016.07.053] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 07/24/2016] [Accepted: 07/31/2016] [Indexed: 06/06/2023]
Abstract
New, simple, accurate and sensitive UV spectrophotometric and chemometric methods have been developed and validated for determination of Entacapone (ENT), Levodopa (LD) and Carbidopa (CD) in ternary mixture. Method A is a derivative ratio spectra zero-crossing spectrophotometric method which allows the determination of ENT in the presence of both LD and CD by measuring the peak amplitude at 249.9nm in the range of 1-20μgmL-1. Method B is a double divisor-first derivative of ratio spectra method, used for determination of ENT, LD and CD at 245, 239 and 293nm, respectively. Method C is a mean centering of ratio spectra which allows their determination at 241, 241.6 and 257.1nm, respectively. Methods B and C could successfully determine the studied drugs in concentration ranges of 1-20μgmL-1 for ENT and 10-90μgmL-1 for both LD and CD. Methods D and E are principal component regression and partial least-squares, respectively, used for the simultaneous determination of the studied drugs by using seventeen mixtures as calibration set and eight mixtures as validation set. The developed methods have the advantage of simultaneous determination of the cited components without any pre-treatment. All the results were statistically compared with the reported methods, where no significant difference was observed. The developed methods were satisfactorily applied to the analysis of the investigated drugs in their pure form and in pharmaceutical dosage forms.
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Affiliation(s)
- Maha F Abdel-Ghany
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt
| | - Lobna A Hussein
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt
| | - Miriam F Ayad
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt
| | - Menatallah M Youssef
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt.
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Hosseini M, Mirzanasiri N, Rezapour M, Sheikhha MH, Faridbod F, Norouzi P, Ganjali MR. Sensitive determination of carbidopa through the electrochemiluminescence of luminol at graphene-modified electrodes. LUMINESCENCE 2014; 30:376-81. [DOI: 10.1002/bio.2742] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 06/17/2014] [Accepted: 06/18/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Morteza Hosseini
- Department of Life Science Engineering; University of Tehran; Tehran Iran
| | | | - Morteza Rezapour
- Research Institute of the Petroleum Industry (RIPI); Tehran Iran
| | | | - Farnoush Faridbod
- Center of Excellence in Electrochemistry; University of Tehran; Tehran Iran
| | - Parviz Norouzi
- Center of Excellence in Electrochemistry; University of Tehran; Tehran Iran
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Kumar N, Bansal A, Sarma G, Rawal RK. Chemometrics tools used in analytical chemistry: An overview. Talanta 2014; 123:186-99. [DOI: 10.1016/j.talanta.2014.02.003] [Citation(s) in RCA: 172] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 02/02/2014] [Accepted: 02/03/2014] [Indexed: 10/25/2022]
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Abbaspour A, Dehghani E, Noori A. Cyclodextrin Host-Guest Recognition Approach for Simultaneous Quantification and Voltammetric Studies of Levodopa and Carbidopa in Pharmaceutical Products. ELECTROANAL 2011. [DOI: 10.1002/elan.201100327] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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12
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Issa YM, Hassoun MEM, Zayed AG. APPLICATION OF HIGH PERFORMANCE LIQUID CHROMATOGRAPHIC METHOD FOR THE DETERMINATION OF LEVODOPA, CARBIDOPA, AND ENTACAPONE IN TABLET DOSAGE FORMS. J LIQ CHROMATOGR R T 2011. [DOI: 10.1080/10826076.2011.591024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- Yousry M. Issa
- a Chemistry Department , Faculty of Science, Cairo University , Giza, Egypt
| | - Mohamed E. M. Hassoun
- b Chemistry Department , Faculty of Science, Beni Seuf University , Beni Seuf, Egypt
| | - Ashraf G. Zayed
- b Chemistry Department , Faculty of Science, Beni Seuf University , Beni Seuf, Egypt
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Kinetic approach for the enzymatic determination of levodopa and carbidopa assisted by multivariate curve resolution-alternating least squares. Anal Chim Acta 2010; 673:33-9. [DOI: 10.1016/j.aca.2010.05.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Revised: 05/17/2010] [Accepted: 05/18/2010] [Indexed: 11/24/2022]
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14
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Simultaneous spectrophotometric determination of phenanthridine, phenanthridinone and phenanthridine N-oxide using multivariate calibration methods. OPEN CHEM 2010. [DOI: 10.2478/s11532-009-0121-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractThe multivariate calibration methods, partial least squares (PLS) and principle component regression (PCR) have been used to determine phenanthridine, phenanthridinone and phenanthridine N-oxide in spiked human plasma samples. Resolution of binary and ternary mixtures of analytes with minimum sample pre-treatment and without analyte separation has been successfully achieved analyzing the UV spectral data. The net analyte signal (NAS) concept was also used to calculate multivariate analytical figures of merit such as limit of detection, selectivity and sensitivity. The simultaneous determination of three analytes was possible by PLS and PCR processing of sample absorbance in the 210–355 nm region. Good recoveries were obtained for both synthetic mixtures and spiked human plasma samples.
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Electrochemical detection of carbidopa using a ferrocene-modified carbon nanotube paste electrode. JOURNAL OF THE SERBIAN CHEMICAL SOCIETY 2009. [DOI: 10.2298/jsc0912443y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A chemically modified carbon paste electrode (MCPE) containing ferrocene (FC) and carbon nanotubes (CNT) was constructed. The electrochemical behavior and stability of the MCPE were investigated by cyclic voltammetry. The electrocatalytic activity of the MCPE was investigated and it showed good characteristics for the oxidation of carbidopa (CD) in phosphate buffer solution (PBS). A linear concentration range of 5 to 600 ?M CD, with a detection limit of 3.6?0.17 ?M CD, was obtained. The diffusion coefficient of CD and the transfer coefficient (?) were also determined. The MCPE showed good reproducibility, remarkable long-term stability and especially good surface renewability by simple mechanical polishing. The results showed that this electrode could be used as an electrochemical sensor for the determination of CD in real samples, such as urine samples.
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PAGANI AP, CABEZÓN MA, IBÁÑEZ GA. Simultaneous Kinetic-Spectrofluorometric Determination of Levodopa and Carbidopa Using Partial Least-Squares Regression. ANAL SCI 2009; 25:633-8. [DOI: 10.2116/analsci.25.633] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Ariana P. PAGANI
- Departamento de Química Analítica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario and Instituto de Química Rosario (IQUIR), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
| | - Miguel A. CABEZÓN
- Departamento de Química Analítica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario and Instituto de Química Rosario (IQUIR), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
| | - Gabriela A. IBÁÑEZ
- Departamento de Química Analítica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario and Instituto de Química Rosario (IQUIR), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
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Alam SM, Karim MM, Lee SH, Wabaidur SM, Chung HY, Choi JH, Kang M. Development of a sensitive flow-injection-chemiluminescence detection method for the determination of laevodopa. LUMINESCENCE 2008; 23:327-32. [DOI: 10.1002/bio.1039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Li LJ, Chen QF, Cheng H, Yu LB, Wu JL. Determination of levodopa in pharmaceutical preparations by irreversible biamperometry. CHINESE CHEM LETT 2008. [DOI: 10.1016/j.cclet.2008.04.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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ZHANG YX, ZHANG ZJ, YANG F. Simultaneous Determination of Levodopa and Its Metabolite in Human Blood by Capillary Electrophoresis with Laser-induced Fluorescence Detection. CHINESE J CHEM 2008. [DOI: 10.1002/cjoc.200890092] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Mennickent S, Nail M, Vega M, de Diego M. Quantitative determination of L-DOPA in tablets by high performance thin layer chromatography. J Sep Sci 2007; 30:1893-8. [PMID: 17638351 DOI: 10.1002/jssc.200600533] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A densitometric high performance thin-layer chromatographic (HPTLC) method was developed and validated for quantitative analysis of L-DOPA in tablets. Chromatographic separation was achieved on precoated silica gel F 254 HPTLC plates using a mixture of acetone-chloroform-n-butanol-acetic acid glacial-water (60:40:40:40:35 v/v/v/v/v) as mobile phase. Quantitative analysis was carried out at a wavelength of 497 nm. The method was linear between 100 and 500 ng/microL, with a correlation coefficient of 0.999. The intra-assay variation was between 0.26 and 0.65% and the interassay was between 0.52 and 2.04%. The detection limit was 1.12 ng/microL, and the quantification limit was 3.29 ng/microL. The accuracy ranged from 100.40 to 101.09%, with a CV not higher than 1.40%. The method was successfully applied to quantify L-DOPA in real pharmaceutical samples, including the comparison with HPLC measurements. The method was fast, specific, with a good precision, and accurate for the quantitative determination of L-DOPA in tablets.
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Affiliation(s)
- Sigrid Mennickent
- Department of Pharmacy, Faculty of Pharmacy, University of Concepción, Concepción, Chile.
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Grünhut M, Centurión ME, Band BF. PLS Regression in the Spectrophotometric Data for the Simultaneous Determination of Levodopa and Carbidopa in Pharmaceutical Preparations by Using an Enzymatic Stopped‐Flow FIA Technique. ANAL LETT 2007. [DOI: 10.1080/00032710701486249] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Safavi A, Tohidi M. Simultaneous kinetic determination of levodopa and carbidopa by H-point standard addition method. J Pharm Biomed Anal 2007; 44:313-8. [PMID: 17403592 DOI: 10.1016/j.jpba.2007.02.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2006] [Revised: 02/14/2007] [Accepted: 02/16/2007] [Indexed: 10/23/2022]
Abstract
The kinetic H-point standard addition method (HPSAM) was applied to the simultaneous determination of levodopa and carbidopa. The method was based on the difference in the rate of oxidation of these compounds with Cu(II)-neocuproine system and formation of Cu(I)-neocuproine complex at pH 5.5. The absorbance of the Cu(I)-neocuproine complex was monitored at 453 nm. Experimental conditions such as pH, reagent concentrations, ionic strength and temperature were optimized. Simultaneous determination of levodopa and carbidopa was performed in the range of 0.8-4 and 0.2-1.5 microg ml(-1), respectively. The proposed method was applied to the simultaneous determination of levodopa and carbidopa in pharmaceutical samples, and satisfactory results were obtained.
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Affiliation(s)
- Afsaneh Safavi
- Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 71454, Iran.
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23
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García-Reiriz A, Damiani PC, Olivieri AC. Analysis of amoxicillin in human urine by photo-activated generation of fluorescence excitation-emission matrices and artificial neural networks combined with residual bilinearization. Anal Chim Acta 2007; 588:192-9. [PMID: 17386810 DOI: 10.1016/j.aca.2007.02.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2006] [Revised: 01/25/2007] [Accepted: 02/12/2007] [Indexed: 10/23/2022]
Abstract
Fluorescence excitation-emission data recorded for amoxicillin after photo-activated reaction with periodate have been processed by a novel second-order multivariate method based on the combination of artificial neural networks and residual bilinearization (ANN/RBL), since the signals bear a strong non-linear relation with the analyte concentration. The selected chemometric methodology is employed for the first time to evaluate experimental non-linear second-order spectral information. Due to severe overlapping between the emission profiles for the analyte reaction product and for the urine background, calibration was done using different spiked urine samples. This allowed for the determination of amoxicillin in test spiked urines, other than those employed for calibration. When new urine samples containing a fluorescent anti-inflammatory were analyzed, accurate prediction in the presence of unexpected components required the achievement of the second-order advantage, which is provided by the post-training RBL procedure. Amoxicillin was also determined by ANN/RBL in a series of real urine samples, which allowed one to perform a comparison study with the reference high-performance liquid chromatographic technique.
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Affiliation(s)
- Alejandro García-Reiriz
- Departamento de Química Analítica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, Rosario S2002LRK, Argentina
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24
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Jurado JM, Ocaña JA. Fluorometric Determination of Mixtures of Quinolones by Means of Partial Least Squares and Neural Networks. ANAL SCI 2007; 23:337-41. [PMID: 17372379 DOI: 10.2116/analsci.23.337] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Multivariate calibration methods (partial least squares calibration, back propagation multilayer perceptrons networks, radial basis functions and generalized regression neural networks) were applied to the simultaneous fluorometric quantification of levofloxacin, garenoxacin and grepafloxacin, without previous separation steps. A data matrix was obtained by registering the emission spectra of mixtures of the three quinolones in urine (with concentrations ranging over 0.00-0.40 microg mL-1 for each quinolone) with a 283 nm excitation at pH 4.0. The generalized regression neural network model proved to be the most adequate model for simultaneous quantification of the three quinolones in urine samples.
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Affiliation(s)
- J M Jurado
- Department of Analytical Chemistry, Faculty of Chemistry, University of Seville, Spain.
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25
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TU Y, XU Q, ZOU QJ, YIN ZH, SUN YY, ZHAO YD. Electrochemical Behavior of Levodopa at Multi-Wall Carbon Nanotubes-Quantum Dots Modified Glassy Carbon Electrodes. ANAL SCI 2007; 23:1321-4. [DOI: 10.2116/analsci.23.1321] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Yi TU
- Wuhan National Laboratory for Optoelectronics, Key Laboratory of Biomedical Photonics of Ministry of Education, Hubei Bioinformatics and Molecular Imaging Key Laboratory, College of Life Science and Technology, Huazhong University of Science and Technology
| | - Qiao XU
- Wuhan National Laboratory for Optoelectronics, Key Laboratory of Biomedical Photonics of Ministry of Education, Hubei Bioinformatics and Molecular Imaging Key Laboratory, College of Life Science and Technology, Huazhong University of Science and Technology
| | - Qiu-Ju ZOU
- Wuhan National Laboratory for Optoelectronics, Key Laboratory of Biomedical Photonics of Ministry of Education, Hubei Bioinformatics and Molecular Imaging Key Laboratory, College of Life Science and Technology, Huazhong University of Science and Technology
| | - Zhao-Hui YIN
- Wuhan National Laboratory for Optoelectronics, Key Laboratory of Biomedical Photonics of Ministry of Education, Hubei Bioinformatics and Molecular Imaging Key Laboratory, College of Life Science and Technology, Huazhong University of Science and Technology
| | - Yuan-Yuan SUN
- Wuhan National Laboratory for Optoelectronics, Key Laboratory of Biomedical Photonics of Ministry of Education, Hubei Bioinformatics and Molecular Imaging Key Laboratory, College of Life Science and Technology, Huazhong University of Science and Technology
| | - Yuan-Di ZHAO
- Wuhan National Laboratory for Optoelectronics, Key Laboratory of Biomedical Photonics of Ministry of Education, Hubei Bioinformatics and Molecular Imaging Key Laboratory, College of Life Science and Technology, Huazhong University of Science and Technology
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26
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Benavente F, Giménez E, Olivieri AC, Barbosa J, Sanz-Nebot V. Estimation of the composition of recombinant human erythropoietin mixtures using capillary electrophoresis and multivariate calibration methods. Electrophoresis 2006; 27:4008-15. [PMID: 17054091 DOI: 10.1002/elps.200600132] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A multivariate calibration method using partial least-squares (PLS) is proposed in order to characterize binary mixtures of two types of recombinant human erythropoietin (epoetin alpha and beta), based on the analysis of the highly overlapped UV-electrophoretic profiles obtained with the CE methodology recommended by the European Pharmacopoeia (EurPh). A two-factor PLS-1 model was developed and validated using mixtures of alpha and beta epoetins. Glycoforms were identified according to their effective electrophoretic mobility values and the normalized area values of each glycoform peak were used as multivariate data. Calibration and validation results were satisfactory. The PLS-1 model was successfully used for determination of epoetin alpha and beta contents in the rHuEPO provided by the EurPh as a biological reference product.
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Affiliation(s)
- Fernando Benavente
- Departamento de Química Analítica, Universidad de Barcelona, Barcelona, Spain.
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