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Jayaraman S, Rajarathinam T, Jang HG, Thirumalai D, Lee J, Paik HJ, Chang SC. Ruthenium-Anchored Carbon Sphere-Customized Sensor for the Selective Amperometric Detection of Melatonin. BIOSENSORS 2023; 13:936. [PMID: 37887129 PMCID: PMC10605478 DOI: 10.3390/bios13100936] [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: 09/01/2023] [Revised: 10/10/2023] [Accepted: 10/16/2023] [Indexed: 10/28/2023]
Abstract
Melatonin (MT), a pineal gland hormone, regulates the sleep/wake cycle and is a potential biomarker for neurodegenerative disorders, depression, hypertension, and several cancers, including prostate cancer and hepatocarcinoma. The amperometric detection of MT was achieved using a sensor customized with ruthenium-incorporated carbon spheres (Ru-CS), possessing C- and O-rich catalytically active Ru surfaces. The non-covalent interactions and ion-molecule adducts between Ru and CS favor the formation of heterojunctions at the sensor-analyte interface, thus accelerating the reactions towards MT. The Ru-CS/Screen-printed carbon electrode (SPCE) sensor demonstrated the outstanding electrocatalytic oxidation of MT owing to its high surface area and heterogeneous rate constants and afforded a lower detection limit (0.27 μM), high sensitivity (0.85 μA μM -1 cm-2), and excellent selectivity for MT with the co-existence of crucial neurotransmitters, including norepinephrine, epinephrine, dopamine, and serotonin. High concentrations of active biomolecules, such as ascorbic acid and tyrosine, did not interfere with MT detection. The practical feasibility of the sensor for MT detection in pharmaceutical samples was demonstrated, comparable to the data provided on the product labels. The developed amperometric sensor is highly suitable for the quality control of medicines because of its low cost, simplicity, small sample size, speed of analysis, and potential for automation.
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Affiliation(s)
- Sivaguru Jayaraman
- Department of Cogno-Mechatronics Engineering, College of Nanoscience and Nanotechnology, Pusan National University, Busan 46241, Republic of Korea; (S.J.); (T.R.); (H.-G.J.)
| | - Thenmozhi Rajarathinam
- Department of Cogno-Mechatronics Engineering, College of Nanoscience and Nanotechnology, Pusan National University, Busan 46241, Republic of Korea; (S.J.); (T.R.); (H.-G.J.)
| | - Hyeon-Geun Jang
- Department of Cogno-Mechatronics Engineering, College of Nanoscience and Nanotechnology, Pusan National University, Busan 46241, Republic of Korea; (S.J.); (T.R.); (H.-G.J.)
| | - Dinakaran Thirumalai
- BIT Convergence-Based Innovative Drug Development Targeting Metainflammation, Pusan National University, Busan 46241, Republic of Korea; (D.T.); (J.L.)
| | - Jaewon Lee
- BIT Convergence-Based Innovative Drug Development Targeting Metainflammation, Pusan National University, Busan 46241, Republic of Korea; (D.T.); (J.L.)
- Department of Pharmacy, College of Pharmacy, Pusan National University, Busan 46241, Republic of Korea
| | - Hyun-Jong Paik
- Department of Polymer Science and Engineering, Pusan National University, Busan 46241, Republic of Korea;
| | - Seung-Cheol Chang
- Department of Cogno-Mechatronics Engineering, College of Nanoscience and Nanotechnology, Pusan National University, Busan 46241, Republic of Korea; (S.J.); (T.R.); (H.-G.J.)
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2
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Sunon P, Ngamchuea K. Methylene blue molecularly imprinted polymer for melatonin determination in urine and saliva samples. Mikrochim Acta 2023; 190:348. [PMID: 37566143 DOI: 10.1007/s00604-023-05930-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 07/25/2023] [Indexed: 08/12/2023]
Abstract
A highly sensitive and rapid electrochemical sensor was developed for detecting melatonin using a molecularly imprinted polymer (MIP) with methylene blue as the functional monomer and melatonin as the template. The MIP was synthesized via a simple electropolymerization process that did not require an initiating reagent. The sensor demonstrated good selectivity for melatonin against common interferences such as lactate, cytosine, cytidine, urea, ascorbic acid, creatine, creatinine, serotonin, and tryptophan. Melatonin detection was achieved at a potential of 0.60 V vs. Ag/AgCl with a sensitivity of 138.8 ± 4.7 µA µM‒1 in the linear range 0.097 - 200 µM and a limit of detection of 29 nM (3SB/m). The sensor exhibited excellent reproducibility and repeatability for both within (intra) and between (inter) electrodes (%RSD < 3% for n = 3). The sensor was applied to authentic urine and saliva samples with recoveries of 103 ± 1% and 102 ± 1%, respectively.
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Affiliation(s)
- Pachanuporn Sunon
- School of Chemistry, Institute of Science, Suranaree University of Technology, 111 University Avenue, Suranaree, Muang, Nakhon Ratchasima, 30000, Thailand
- Institute of Research and Development, Suranaree University of Technology, 111 University Avenue, Suranaree, Muang, Nakhon Ratchasima, 30000, Thailand
| | - Kamonwad Ngamchuea
- School of Chemistry, Institute of Science, Suranaree University of Technology, 111 University Avenue, Suranaree, Muang, Nakhon Ratchasima, 30000, Thailand.
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3
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Martínez-Moro R, Del Pozo M, Vázquez L, Martín-Gago JA, Petit-Domínguez MD, Casero E, Quintana C. Electrochemical sensor based on the synergy between Cucurbit[8]uril and 2D-MoS 2 for enhanced melatonin quantification. Sci Rep 2023; 13:10378. [PMID: 37369678 DOI: 10.1038/s41598-023-37401-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 06/21/2023] [Indexed: 06/29/2023] Open
Abstract
We present the development of an electrochemical sensor towards melatonin determination based on the synergistic effect between MoS2 nanosheets and cucurbit[8]uril. For the sensor construction cucurbit[8]uril suspensions were prepared in water, and MoS2 nanosheets were obtained by liquid exfoliation in ethanol:water. The sensing platform was topographically characterized by Atomic Force Microscopy. Electrochemical Impedance Spectroscopy experiments allowed us to study the charge transfer process during melatonin oxidation. Moreover, stoichiometry of the resulting complex has also been determined. After the optimization of the sensor construction and the experimental variables involved in the Differential Pulse Voltammetric response of melatonin, detection limit of 3.80 × 10-7 M, relative errors minor than 3.8% and relative standard deviation lower than 4.4% were obtained. The proposed sensor has been successfully applied to melatonin determination in pharmaceutical and biological samples as human urine and serum, with very good recoveries ranging from 90 to 102%.
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Affiliation(s)
- Rut Martínez-Moro
- Departamento de Química Analítica y Análisis Instrumental. Facultad de Ciencias, c/ Francisco Tomás y Valiente, Nº7. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - María Del Pozo
- Departamento de Química Analítica y Análisis Instrumental. Facultad de Ciencias, c/ Francisco Tomás y Valiente, Nº7. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Luis Vázquez
- Instituto de Ciencia de Materiales de Madrid (CSIC), c/ Sor Juana Inés de la Cruz Nº3. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - José A Martín-Gago
- Instituto de Ciencia de Materiales de Madrid (CSIC), c/ Sor Juana Inés de la Cruz Nº3. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - María Dolores Petit-Domínguez
- Departamento de Química Analítica y Análisis Instrumental. Facultad de Ciencias, c/ Francisco Tomás y Valiente, Nº7. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Elena Casero
- Departamento de Química Analítica y Análisis Instrumental. Facultad de Ciencias, c/ Francisco Tomás y Valiente, Nº7. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049, Madrid, Spain.
| | - Carmen Quintana
- Departamento de Química Analítica y Análisis Instrumental. Facultad de Ciencias, c/ Francisco Tomás y Valiente, Nº7. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049, Madrid, Spain.
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4
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Keerthana P, George A, Benny L, Varghese A. Biomass Derived Carbon Quantum Dots embedded PEDOT/CFP Electrode for The Electrochemical detection of Phloroglucinol. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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5
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Yakupova Z, Yakubenko A, Bogdanova P, Godunov P, Vakh C, Garmonov S, Bulatov A. Solidified floating organic drop microextraction procedure based on deep eutectic solvent for the determination of melatonin in pharmaceuticals and dietary supplements. Microchem J 2022. [DOI: 10.1016/j.microc.2022.108373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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6
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Amjadi S, Akhoundian M, Alizadeh T. A simple method for melatonin determination in the presence of high levels of tryptophan using an unmodified carbon paste electrode and square wave anodic stripping voltammetry. ELECTROANAL 2022. [DOI: 10.1002/elan.202200210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Somayeh Amjadi
- University of Mohaghegh Ardabili Faculty of Basic Sciences IRAN (THE ISLAMIC REPUBLIC OF)
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Alessa H, Saber AL, Althakafy JT. Up-to-date studies regarding the determination of melatonin by chromatographic methods. Arch Pharm (Weinheim) 2021; 355:e2100378. [PMID: 34842297 DOI: 10.1002/ardp.202100378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/31/2021] [Accepted: 11/02/2021] [Indexed: 11/09/2022]
Abstract
Melatonin is an indolic compound that has been reported in the literature to exist in human-based samples, vertebrates, vegetables, fruits, and pharmaceutical products. Melatonin is considered a dietary supplement and can regulate circadian rhythms, although it has not been classified as a drug by the US Food and Drug Administration. Several analytical methods have been used for its detection. This study aimed to summarize the recent outcomes of the chromatographic methods such as electrophoretic methods, gas chromatography, and liquid chromatography, which have been used for the determination of melatonin in the last three decades, with the focus on gas chromatography and high-performance liquid chromatography methods.
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Affiliation(s)
- Hussain Alessa
- Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Amr L Saber
- Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia.,Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt
| | - Jalal T Althakafy
- Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
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8
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Tabanlıgil Calam T. A novel, efficient and sensitive method for the simultaneous determination of riboflavin (vitamin B2) and pyridoxine hydrochloride (vitamin B6) in food and pharmacological samples using an electrochemical sensor based on 4,4′-diamino benzophenone. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106557] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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9
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Hengameh Zabolestani, Sarhadi H, Beitollahi H. Electrochemical Sensor Based on Modified Screen Printed Electrode for Vitamin B6 Detection. SURFACE ENGINEERING AND APPLIED ELECTROCHEMISTRY 2021. [DOI: 10.3103/s1068375521020149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Kumar N, Goyal RN. Simultaneous determination of melatonin and 5-hydroxytrptophan at the disposable poly-(melamine)/poly-(o-aminophenol) composite modified screen printed sensor. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114458] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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11
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Shaidarova LG, Chelnokova IA, Il’ina MA, Leksina YA, Budnikov HC. Amperometric Detection of Tryptophane and Pyridoxine on a Dual Screen-Printed Electrode Modified by Gold Nanoparticles in a Flow-Injection System. JOURNAL OF ANALYTICAL CHEMISTRY 2019. [DOI: 10.1134/s106193481906011x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Manoj D, Rajendran S, Qin J, Sundaravadivel E, Yola ML, Atar N, Gracia F, Boukherroub R, Gracia-Pinilla M, Gupta VK. Heterostructures of mesoporous TiO2 and SnO2 nanocatalyst for improved electrochemical oxidation ability of vitamin B6 in pharmaceutical tablets. J Colloid Interface Sci 2019; 542:45-53. [DOI: 10.1016/j.jcis.2019.01.118] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 01/25/2019] [Accepted: 01/28/2019] [Indexed: 11/29/2022]
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13
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Voltammetric determination of vitamin B6 (pyridoxine) at a graphite screen-printed electrode modified with graphene oxide/Fe3O4@SiO2 nanocomposite. Russ Chem Bull 2018. [DOI: 10.1007/s11172-018-2064-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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14
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Zafra-Roldán A, Corona-Avendaño S, Montes-Sánchez R, Palomar-Pardavé M, Romero-Romo M, Ramírez-Silva MT. New insights on the spectrophotometric determination of melatonin pK a values and melatonin-βCD inclusion complex formation constant. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 190:442-449. [PMID: 28961528 DOI: 10.1016/j.saa.2017.09.042] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 09/15/2017] [Indexed: 06/07/2023]
Abstract
Using UV-Vis spectrophotometry a stability study of melatonin at different pH values was done in aqueous media, finding that at acidic pH melatonin is unstable when interacting with the environment, however it becomes stable protecting it from light and oxygen. From the UV-Vis spectra and SQUAD software, melatonin pKa values, in a completely protected aqueous medium, were estimated as 5.777±0.011 and 10.201±0.024. Using the same techniques, the melatonin and β-cyclodextrin inclusion complex formation constants were assessed at pH3, 7 and 11.5, giving the values of log β=(3.07±0.06), (2.94±0.01) and (3.07±0.06) M-1, respectively. From the global acidity formation constants and the complexes' formation constants, the molar fractions were determined for each species of MT and MT-βCD, to build the molar fraction-[βCD]-pH 3D diagram and the molar fraction-pH 2D diagrams, where it was possible to observe the predominance of the MT species with and without βCD. A voltammetric study at pH3, allowed obtaining a value of log β=(3.15±0.01) M-1, which corroborates that obtained through UV-Vis spectrophotometry, supporting strongly the rationale behind using simple, straightforward techniques.
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Affiliation(s)
- A Zafra-Roldán
- Universidad Autónoma Metropolitana-Azcapotzalco, Departamento de Materiales, Área Ingeniería Materiales, C.P. 02200 Ciudad de México, Mexico
| | - S Corona-Avendaño
- Universidad Autónoma Metropolitana-Azcapotzalco, Departamento de Materiales, Área Ingeniería Materiales, C.P. 02200 Ciudad de México, Mexico.
| | - R Montes-Sánchez
- Universidad Autónoma Metropolitana-Azcapotzalco, Departamento de Materiales, Área Ingeniería Materiales, C.P. 02200 Ciudad de México, Mexico
| | - M Palomar-Pardavé
- Universidad Autónoma Metropolitana-Azcapotzalco, Departamento de Materiales, Área Ingeniería Materiales, C.P. 02200 Ciudad de México, Mexico
| | - M Romero-Romo
- Universidad Autónoma Metropolitana-Azcapotzalco, Departamento de Materiales, Área Ingeniería Materiales, C.P. 02200 Ciudad de México, Mexico
| | - M T Ramírez-Silva
- Universidad Autónoma Metropolitana-Iztapalapa, Departamento de Química, Área de Química Analítica, C.P. 09340 Ciudad de México, Mexico.
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Smajdor J, Piech R, Pięk M, Paczosa-Bator B. Carbon black as a glassy carbon electrode modifier for high sensitive melatonin determination. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.06.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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16
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Alpar N, Pınar PT, Yardım Y, Şentürk Z. Voltammetric Method for the Simultaneous Determination of Melatonin and Pyridoxine in Dietary Supplements Using a Cathodically Pretreated Boron-doped Diamond Electrode. ELECTROANAL 2017. [DOI: 10.1002/elan.201700077] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nurcan Alpar
- Yuzuncu Yil University; Faculty of Pharmacy, Department of Analytical Chemistry; 65080 Van Turkey
| | - Pınar Talay Pınar
- Yuzuncu Yil University; Faculty of Pharmacy, Department of Analytical Chemistry; 65080 Van Turkey
| | - Yavuz Yardım
- Yuzuncu Yil University; Faculty of Pharmacy, Department of Analytical Chemistry; 65080 Van Turkey
| | - Zühre Şentürk
- Yuzuncu Yil University; Faculty of Science, Department of Analytical Chemistry; 65080 Van Turkey
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17
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Kumar N, Rosy, Goyal RN. Nanopalladium grained polymer nanocomposite based sensor for the sensitive determination of Melatonin. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.06.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Caro CA, Lillo L, Valenzuela FJ, Cabello G, Lang E, Vallejos D, Castillo C. Oxidation of melatonin on a glassy carbon electrode modified with metallic glucosamines. Synthesis and characterization. J Solid State Electrochem 2016. [DOI: 10.1007/s10008-015-3066-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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19
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Lin Z, Bian W, Zheng J, Cai Z. Magnetic metal–organic framework nanocomposites for enrichment and direct detection of small molecules by negative-ion matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Chem Commun (Camb) 2015; 51:8785-8. [DOI: 10.1039/c5cc02495a] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Fe3O4@ZIF-8 MNCs were proposed as an absorbent and a new matrix for negative ion MALDI-TOF MS, which exhibited interference-free background, good reproducibility and sensitivity for analysis of small molecules.
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Affiliation(s)
- Zian Lin
- Partner State Key Laboratory of Environmental and Biological Analysis
- Department of Chemistry
- Hong Kong Baptist University
- Hong Kong, SAR
- P. R. China
| | - Wei Bian
- Partner State Key Laboratory of Environmental and Biological Analysis
- Department of Chemistry
- Hong Kong Baptist University
- Hong Kong, SAR
- P. R. China
| | - Jiangnan Zheng
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety
- College of Chemistry
- Fuzhou University
- Fuzhou
- China
| | - Zongwei Cai
- Partner State Key Laboratory of Environmental and Biological Analysis
- Department of Chemistry
- Hong Kong Baptist University
- Hong Kong, SAR
- P. R. China
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Oladi E, Mohamadi M, Shamspur T, Mostafavi A. Spectrofluorimetric determination of melatonin in kernels of four different Pistacia varieties after ultrasound-assisted solid-liquid extraction. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 132:326-329. [PMID: 24878439 DOI: 10.1016/j.saa.2014.05.010] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2014] [Revised: 04/24/2014] [Accepted: 05/02/2014] [Indexed: 06/03/2023]
Abstract
Melatonin is normally consumed to regulate the body's biological cycle. However it also has therapeutic properties, such as anti-tumor, anti-aging and protects the immune system. There are some reports on the presence of melatonin in edible kernels such as walnuts, but the extraction of melatonin from pistachio kernels is reported here for the first time. For this, the methanolic extract of pistachio kernels was exposed to gas chromatography/mass spectrometry analysis which confirmed the presence of melatonin. A fluorescence-based method was applied for the determination of melatonin in different extracts. When excited at λ=275 nm, the fluorescence emission intensity of melatonin was measured at λ=366 nm. Ultrasound-assisted solid-liquid extraction was used for the extraction of melatonin from pistachio kernels prior to fluorimetric determination. To achieve the highest extraction recovery, the main parameters affecting the extraction efficiency such as extracting solvent type and volume, temperature, sonication time and pH were evaluated. Under the optimized conditions, a linear dependence of fluorescence intensity on melatonin concentration was observed in the range of 0.0040-0.160 μg mL(-1), with a detection limit of 0.0036 μg mL(-1). This method was applied successfully for measuring and comparing the melatonin content in the kernels of four different varieties of Pistacia including Ahmad Aghaei, Akbari, Kalle Qouchi and Fandoghi. In addition, the results obtained were compared with those obtained using GC/MS. A good agreement was observed indicating the reliability of the proposed method.
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Affiliation(s)
- Elham Oladi
- Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran; Young Research Society, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Maryam Mohamadi
- Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran; Young Research Society, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Tayebeh Shamspur
- Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran; Phytochemistry Groups, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Ali Mostafavi
- Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran; Phytochemistry Groups, Shahid Bahonar University of Kerman, Kerman, Iran.
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21
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Antal IP, Bazel YR, Kormosh ZA. Electrochemical methods for determining group B vitamins. JOURNAL OF ANALYTICAL CHEMISTRY 2013. [DOI: 10.1134/s1061934813070034] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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22
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Levent A. Electrochemical determination of melatonin hormone using a boron-doped diamond electrode. DIAMOND AND RELATED MATERIALS 2012; 21:114-119. [DOI: https:/doi.org/10.1016/j.diamond.2011.10.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/01/2024]
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23
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Zhang Y, Wang Y. Voltammetric Determination of Vitamin B6 at Glassy Carbon Electrode Modified with Gold Nanoparticles and Multi-Walled Carbon Nanotubes. ACTA ACUST UNITED AC 2011. [DOI: 10.4236/ajac.2011.22022] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Saber AL. Novel Potentiometric Sensors for Determination of Melatonin and Oxomemazine in Biological Samples and in Pharmaceutical Formulations. ELECTROANAL 2010. [DOI: 10.1002/elan.201000293] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Razmi H, Mohammad-Rezaei R. Flow injection amperometric determination of pyridoxine at a Prussian blue nanoparticle-modified carbon ceramic electrode. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2009.10.072] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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26
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Asadpour-Zeynali K, Bastami M. Net analyte signal standard addition method (NASSAM) as a novel spectrofluorimetric and spectrophotometric technique for simultaneous determination, application to assay of melatonin and pyridoxine. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 75:589-597. [PMID: 20022803 DOI: 10.1016/j.saa.2009.11.023] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 11/01/2009] [Accepted: 11/10/2009] [Indexed: 05/28/2023]
Abstract
In this work a new modification of the standard addition method called "net analyte signal standard addition method (NASSAM)" is presented for the simultaneous spectrofluorimetric and spectrophotometric analysis. The proposed method combines the advantages of standard addition method with those of net analyte signal concept. The method can be applied for the determination of analyte in the presence of known interferents. The accuracy of the predictions against H-point standard addition method is not dependent on the shape of the analyte and interferent spectra. The method was successfully applied to simultaneous spectrofluorimetric and spectrophotometric determination of pyridoxine (PY) and melatonin (MT) in synthetic mixtures and in a pharmaceutical formulation.
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Affiliation(s)
- Karim Asadpour-Zeynali
- Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
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Saracino MA, Mercolini L, Musenga A, Bugamelli F, Raggi MA. Comparison of analytical methods for the quality control of a new formulation containing soy extract and melatonin. J Sep Sci 2008; 31:1851-9. [PMID: 18461639 DOI: 10.1002/jssc.200700595] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Three analytical methods have been developed and compared for the quality control of a new formulation (Soymen GN(R) capsules) containing soy extract and melatonin for the treatment of menopausal symptoms. The first method is based on MEKC with diode-array detection, using a mixture of basic carbonate buffer (95%) and methanol (5%), containing 55 mM SDS, as the BGE. The second method is an HPLC method with UV detection at 260 nm. The third method is an HPLC method coupled to amperometric detection which is carried out at an oxidation potential of +0.8 V. In both HPLC systems, the chromatographic separation is obtained on an RP C18 column using a mixture of ACN and an acidic phosphate buffer (25:75 v/v) as the mobile phase. A feasible pretreatment procedure with a methanol/water mixture has been implemented to achieve the quantitative extraction of the main soy isoflavones and of melatonin from the capsules. The results obtained with the three methods are in good agreement with each other and satisfactory in terms of linearity (r(2) >0.9996), precision (RSD <5.4%) and accuracy (recovery >97%). Thus, each of the three analytical methods seems to be suitable for the simultaneous analysis of the main soy isoflavones and melatonin in the new commercial formulation.
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Affiliation(s)
- Maria Addolorata Saracino
- Laboratory of Pharmaco-Toxicological Analysis, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Alma Mater Studiorum - University of Bologna, Bologna, Italy.
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28
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Voltammetric Investigation of Vitamin B_6 at a Glassy Carbon Electrode and Its Application in Determination. B KOREAN CHEM SOC 2008. [DOI: 10.5012/bkcs.2008.29.1.038] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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29
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Electrochemical behaviour of pyridoxine hydrochloride (vitamin B6) at carbon paste electrode modified with crown ethers. J Solid State Electrochem 2007. [DOI: 10.1007/s10008-007-0435-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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30
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Zhou X, Zheng C, Huang J, You T. Identification of herb Acanthopanax senticosus (Rupr. Et Maxim.) harms by capillary electrophoresis with electrochemical detection. ANAL SCI 2007; 23:705-11. [PMID: 17575355 DOI: 10.2116/analsci.23.705] [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] [Indexed: 11/23/2022]
Abstract
In this paper, a rapid, high efficient, sensitive and inexpensive approach based on a combination of simple ultrasonic extract and capillary electrophoresis (CE) separation with electrochemical detection (ED), is described to identify herbs by comparing their CE-ED profiles (namely, CE-ED electropherograms). The proposed method takes advantage of ultra-small sample volume, low consumption of organic solvent, simple sample pretreatment and easy cleanup procedure. It was applied to analyze the CE-ED profiles of stems of herb Acanthopanax senticosus (Rupr. Et Maxim.) Harms from different sources and different parts (roots, rhizomes, stems and leaves) of this herb. By comparing peak number, peak height and peak height ratio, we found that the CE-ED profiles showed big differences for the herbs from the different sources and the different parts of this herb. In addition, the distribution of bioactive compounds (isofraxidin, rutin and chlorogenic acid) in the different parts of this herb and their content variations affected by the source were studied with the CE-ED method. Based on their own unique CE-ED profiles, these herbs from the different sources and the different parts of this herb could be easily distinguished. Therefore, the proposed approach could be used as a rapid, high efficient and sensitive method for the identification of herbal medicines.
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Affiliation(s)
- Xiaoguang Zhou
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, P. R. China
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31
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Pournaghi-Azar MH, Dastangoo H, Ziaei M. Electrocatalytic oxidation of pyridoxine (vitamin B6) on aluminum electrode modified by metallic palladium particles/iron (III) hexacyanoferrate (II) film. J Solid State Electrochem 2007. [DOI: 10.1007/s10008-007-0273-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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32
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Simionato AVC, Mauro Lanças F, Antônio Ruggiero M. Separation of Water‐Soluble Vitamins by Micellar Electrokinetic Capillary Chromatography in Pharmaceutical Samples. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070500451889] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
| | - Fernando Mauro Lanças
- a Laboratory of Chromatography , Institute of Chemistry at São Carlos, University of São Paulo , São Carlos, SP, Brazil
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33
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Wu X, Wu W, Zhang L, Xie Z, Qiu B, Chen G. Micellar electrokinetic capillary chromatography for fast separation and sensitive determination of melatonin and related indoleamines using end-column amperometric detection. Electrophoresis 2006; 27:4230-9. [PMID: 17075947 DOI: 10.1002/elps.200600248] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
MEKC was used in conjunction with end-column amperometric detection (AD) at a carbon disc electrode (0.3 mm diameter) for the selective and sensitive determination of melatonin and its five related indoleamines including its precursors and metabolites in the pineal gland. The introduction of a sample stacking technique in injection and the buffer additive SDS in the buffer solution system provided the rapid and sensitive analysis. Optimal buffer conditions (10 mmol/L phosphate containing 20 mmol/L SDS, pH 7.2), detection potential (+1.0 V vs. Ag/AgCl), and electrokinetic injection 10 s with the separation voltage of 24 kV were employed to achieve the baseline separation of six pineal hormones within 15 min. The peak currents and the analyte concentrations have a good linear relationship over the range of 6.0 x 10(-8) 6.0 x 10(-5 )mol/L. The detection limits for six pineal hormones by AD are 9.7 to 41.8 nmol/L (equal to 2.0 to 9.7 ng/mL) (S/N = 3), respectively. It is proved to provide about 30- to 250-fold improvement over UV, and be comparable with the sensitive fluorescence detection, which needs pre-column derivatization. The proposed method has been applied for analysis of melatonin and related indoleamines in rat pineal glands. A very simple sample pretreatment procedure, merely involving the homogenization step in perchloric acid, was enough to achieve recoveries in the range of 71 to 127% for all the analytes in the pineal gland.
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Affiliation(s)
- Xiaoping Wu
- Ministry of Education Key Laboratory of Analysis and Detection Technology for Food Safety, Fuzhou University, Department of Chemistry, Fuzhou, P R China
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Varvaresou A, Tsirivas E, Iakovou K, Gikas E, Papathomas Z, Vonaparti A, Panderi I. Development and validation of a reversed-phase ion-pair liquid chromatography method for the determination of magnesium ascorbyl phosphate and melatonin in cosmetic creams. Anal Chim Acta 2006; 573-574:284-90. [PMID: 17723535 DOI: 10.1016/j.aca.2005.12.074] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2005] [Revised: 12/09/2005] [Accepted: 12/27/2005] [Indexed: 11/18/2022]
Abstract
A reversed-phase ion-pair high-performance liquid chromatographic method was developed and validated for the determination of magnesium ascorbyl phosphate and melatonin in cosmetic creams. The determination was performed on a BDS C 18 analytical column (250 x 4.6 mm i.d., 5 microm particle size); the mobile phase consisted of 0.020 M tetrabutylammonium hydroxide and 0.025 M potassium dihydrogen phosphate (pH 6.8) mixed with acetonitrile in a ratio (77:23, v/v) and pumped at a flow rate 1.00 ml min(-1). The UV detector was operated at 260 nm. The retention times of the magnesium ascorbyl phosphate, melatonin and chlorthalidone that was used as internal standard, were 6.55, 9.18 and 11.07 min, respectively. Calibration graphs are linear (r better than 0.9990, n=6), in concentration range 1.00-10.00 microg ml(-1) for magnesium ascorbyl phosphate and 0.63-6.25 microg ml(-1) for melatonin. The intra- and inter-day R.S.D. values were less than 6.0%, while the relative percentage error E(r) was less than 3.5% (n=5). The quantitation limits were 0.69 and 0.47 microg ml(-1), for magnesium ascorbyl phosphate and melatonin, respectively. The method was applied to the analysis of a cosmetic cream and proved to be suitable for rapid and reliable quality control.
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Affiliation(s)
- Athanasia Varvaresou
- University of Athens, School of Pharmacy, Department of Pharmaceutical Chemistry, 157 71 Panepistimiopolis, Zografou, Athens, Greece
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35
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Musijowski J, Pobozy E, Trojanowicz M. On-line preconcentration techniques in determination of melatonin and its precursors/metabolites using micellar electrokinetic chromatography. J Chromatogr A 2006; 1104:337-45. [PMID: 16343514 DOI: 10.1016/j.chroma.2005.11.063] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2005] [Revised: 11/08/2005] [Accepted: 11/18/2005] [Indexed: 11/27/2022]
Abstract
Determination of melatonin (MT) (N-acetyl-5-methoxytryptamine) and related indole compounds using standard capillary electrophoresis (CE) system with UV detection was investigated. Satisfactory separations of six analytes i.e. l-tryptophan (l-TRP), 5-methoxyindoleacetic acid (5-MIAA), 6-hydroxymelatonin (6-HMT), MT, serotonin (SER) and 5-methoxytryptamine (5-MTRA) were performed employing micellar electrokinetic chromatography (MEKC). The optimal background electrolytes (BGE) used for separations were 20mM tetraborate buffer (pH 9.2) and 20mM phosphate buffer (pH 3.3) when employing techniques with normal and reverse migration of micelles, respectively. Fifty millimolar sodium dodecyl sulfate (SDS) was employed as the pseudostationary phase and voltage of +/-20kV was used throughout the investigation. On-line preconcentration techniques, stacking and sweeping, were applied in order to overcome high detection limits that are a serious drawback of CE with UV detection. A comparison of used techniques, concerning enhancement factors and limits of detection (LOD), is presented. Obtained results show that the use of stacking with reverse migrating micelles (SRMM) as one of preconcentration techniques allows obtaining the lowest estimated LODs for MT at the level of 30ng/mL with injection time of 99s at 0.5psi. Estimated LODs for other analytes in these conditions were, 21, 26 and 100ng/mL for l-TRP, 5-MIAA and 6-HMT, respectively. Signals of 5-MTRA and SER obtainable only with 10s injection allowed reaching estimated LODs of 62.5 and 130ng/mL, respectively. Analysis of spiked, diluted human serum was carried out as a preliminary application illustration of developed procedure.
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Affiliation(s)
- Jacek Musijowski
- Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
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36
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Pobozy E, Michalski A, Sotowska-Brochocka J, Trojanowicz M. Determination of melatonin and its precursors and metabolites using capillary electrophoresis with UV and fluorometric detection. J Sep Sci 2005; 28:2165-72. [PMID: 16318213 DOI: 10.1002/jssc.200500095] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A micellar electrokinetic chromatography method has been developed for simultaneous determination of melatonin and its precursors and metabolites. A 20 mM borate buffer pH 9.5 with 50 mM SDS served as the electrolyte. Tryptophan, 5-methoxyindoleacetic acid, 6-hydroxymelatonin, melatonin, serotonin, and 5-methoxytryptamine were baseline separated in less than 13 min. The limits of detection for UV detection and fluorometric detection based on native fluorescence of analytes were at the sub-ppm level. The proposed method with UV detection was applied to melatonin content control in pharmaceutical tablets with a precision expressed as RSD (n = 7) = 1.6%. For biological samples extraction with chloroform and ethyl acetate was examined. With ethyl acetate and chloroform recoveries of 87.2% and 82.1% melatonin, respectively, were obtained from plasma samples. The recovery of melatonin from spiked urine samples was 80.0% for ethyl acetate and 82.5% for chloroform. Fluorometric detection provides about two-fold improvement over UV in the detection of melatonin and minor improvements for three other analytes, but is much poorer than UV for tryptophan and 6-hydroxymelatonin in applied conditions.
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Affiliation(s)
- Ewa Pobozy
- Department of Chemistry, University of Warsaw, Warsaw, Poland.
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37
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Guan Y, Chu Q, Fu L, Ye J. Determination of antioxidants in cosmetics by micellar electrokinetic capillary chromatography with electrochemical detection. J Chromatogr A 2005; 1074:201-4. [PMID: 15941056 DOI: 10.1016/j.chroma.2005.03.063] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A new and efficient method for the determination of antioxidants [Propyl gallate (PG), tert-butylhydroquinone (TBHQ), butylated hydroxyanisole (BHA), and butylated hydroxytoluene (BHT)] in cosmetics has been established by using micellar electrokinetic capillary chromatography with electrochemical detection (MECC-ED). Under the optimum conditions of the method, all analytes were successfully separated within 13 min at the separation voltage of 18 kV in a 20 mmol/L borate running buffer (pH 7.4) containing 25 mmol/L sodium dodecyl sulfate. The excellent linearity was obtained in the concentration range from 5.0 x 10(-4) to 2.0 x 10(-6) mol/L and the detection limits (S/N = 3) of PG, TBHQ, BHA, and BHT range from 3 x 10(-7) to 3 x 10(-6) mol/L.
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Affiliation(s)
- Yueqing Guan
- Department of Chemistry, East China Normal University, Shanghai 200062, China
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38
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Sorouraddin MH, Rashidi MR, Ghorbani-Kalhor E, Asadpour-Zeynali K. Simultaneous spectrofluorimetric and spectrophotometric determination of melatonin and pyridoxine in pharmaceutical preparations by multivariate calibration methods. ACTA ACUST UNITED AC 2005; 60:451-8. [PMID: 15885688 DOI: 10.1016/j.farmac.2005.03.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2005] [Revised: 03/20/2005] [Accepted: 03/31/2005] [Indexed: 11/23/2022]
Abstract
Partial least-squares (PLS) calibration and principal component regression (PCR) methods were utilized for the simultaneous spectrofluorimetric and spectrophotometric determination of pyridoxine (PY) and melatonin (MT). Since emission and adsorption spectra of these drugs overlap, PY and MT cannot be directly determined by fluorimetric nor by spectrophotometric methods. Full-spectrum multivariate calibration PLS and PCR methods were developed for both fluorimetry and spectrophotometry. The conditions were optimized for fluorimetric as well as for spectrophotometric determination of both drugs. The simultaneous determination of PY and MT was carried out in mixtures by recording the emission fluorescence spectrum between 324 and 500 nm (lambda(ex) 285 nm) for fluorimetry, and by recording the absorption spectrum between 250 and 350 nm for spectrophotometry (lambda(max(PY)) 310 nm, lambda(max(MT)) 278 nm). The experimental calibration matrixes were designed orthogonally. At the optimum conditions, dynamic ranges were 0.04-1.3 and 0.1-4 microg ml(-1) for fluorimetry and 1-22 and 1-24 microg ml(-1) for spectrophotometry for MT and PY, respectively. The calibration concentrations were prepared in the dynamic ranges. The parameters of the chemometrics procedure for the simultaneous determination of MT and PY were optimized, and the proposed methods were validated with prediction set. Finally the procedures were successfully applied to simultaneous spectrofluorimetric and spectrophotometric determination of PY and MT in synthetic mixtures and in a pharmaceutical formulation.
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39
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Guan Y, Chu Q, Ye J. Determination of uric acid in human saliva by capillary electrophoresis with electrochemical detection: potential application in fast diagnosis of gout. Anal Bioanal Chem 2004; 380:913-7. [PMID: 15700169 DOI: 10.1007/s00216-004-2848-y] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2004] [Revised: 08/15/2004] [Accepted: 09/13/2004] [Indexed: 10/26/2022]
Abstract
The clinical manifestations of gout result from the formation and deposition of uric acid (UA) crystals. The monitoring of UA level in less invasive biological samples such as saliva is suggested for diagnosis and therapy of gout, hyperuricemia and the Lesch-Nyhan syndrome. In order to investigate the correlation between trace amounts of UA in human saliva and urine and explore the potential application in fast diagnosis of gout, capillary electrophoresis with electrochemical detection (CE-ED) was applied for the determination of UA in human saliva and urine in this work. Under the optimum conditions, UA and three coexisting analytes could be well separated within 14 min at the separation voltage of 14 kV in 80 mmol L(-1) borax running buffer (pH 7.8). A good linear relationship was established between peak current and concentration of analytes over two orders of magnitude with detection limits (S/N = 3) ranging from 1.09 x 10(-7) to 5.0 x 10(-7) mol L(-1) for all analytes. This proposed method has been successfully applied for study of the correlation between the UA content of human saliva and urine, providing an alternative and convenient method for rapid diagnosis of gout.
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Affiliation(s)
- Yueqing Guan
- Department of Chemistry, East China Normal University, Shanghai 200062, Peoples Republic of China
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40
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Qu W, Wu K, Hu S. Voltammetric determination of pyridoxine (Vitamin B6) by use of a chemically-modified glassy carbon electrode. J Pharm Biomed Anal 2004; 36:631-5. [PMID: 15522541 DOI: 10.1016/j.jpba.2004.07.016] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2004] [Revised: 07/10/2004] [Accepted: 07/10/2004] [Indexed: 11/25/2022]
Abstract
A novel carbon nanotube-modified glassy carbon electrode was described for the direct determination of pyridoxine. The electrochemical behavior of pyridoxine was investigated, and a well-defined oxidation peak with high sensitivity was observed at the modified electrode. Owing to the unique structure and extraordinary properties of multi-wall carbon nanotube (MWNT), the MWNT-modified glassy carbon electrode shows obvious electrocatalytic activity to the oxidation of pyridoxine, since it greatly enhances the oxidation peak current of pyridoxine as well as lowers its oxidation overpotential. Based on this, a very sensitive and simple voltammetric method was developed for the measurement of pyridoxine. A sensitive linear voltammetric response for pyridoxine was obtained in the concentration range of 5 x 10(-7)-1 x 10(-4)mol/L, and the detection limit is 2 x 10(-7)mol/L using differential pulse voltammetry. Compared with other voltammetric methods, this proposed method possesses many advantages such as very low detection limit, fast response, low cost and simplicity. The practical application of this new analytical method was demonstrated with pyridoxine drugs.
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Affiliation(s)
- Wanyun Qu
- Department of Chemistry, Wuhan University, Wuhan 430072, PR China
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41
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Zhang LY, Liu YM, Wang ZL, Cheng JK. Capillary zone electrophoresis with pre-column NDA derivatization and amperometric detection for the analysis of four aliphatic diamines. Anal Chim Acta 2004. [DOI: 10.1016/j.aca.2003.11.075] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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42
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Teixeira MF, Marino G, Dockal ER, Cavalheiro ÉT. Voltammetric determination of pyridoxine (Vitamin B6) at a carbon paste electrode modified with vanadyl(IV)–Salen complex. Anal Chim Acta 2004. [DOI: 10.1016/j.aca.2003.11.046] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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43
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Determination of melatonin in commercial preparations by micellar electrokinetic chromatography and spectrofluorimetry. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00662-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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44
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Corujo-Antuña JL, Abad-Villar EM, Fernández-Abedul MT, Costa-García A. Voltammetric and flow amperometric methods for the determination of melatonin in pharmaceuticals. J Pharm Biomed Anal 2003; 31:421-9. [PMID: 12615228 DOI: 10.1016/s0731-7085(02)00349-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Melatonin can be sensitively detected in pharmaceuticals by two different and simple electrochemical methods: cyclic voltammetry (CV) and amperometric detection in a flow injection analysis system (FIA-ED). An adequate pre-treatment of the carbon paste electrode in the first case and the employ of a high flow rate in the second one were the key for obtaining a very good reproducibility (R.S.D. values of 1.5 (n=10) and 1.3% (n=20), respectively). Low limits of detection were achieved and with the coupling of a flow system a linear dynamic range of three orders of magnitude (from 10(-8) to 10(-5) M) was obtained. Both methods were applied to the determination of melatonin in pharmaceuticals. In order to best validate these methodologies a fluorescent procedure was developed to contrast the results. As no interferences from the matrix were found the employ of a separation technique is not necessary. In this way the procedure is fastened and simplified. Moreover, the low price, ease of handling, possibility of automation and high sample throughput are important advantages that convert the flow methodology in an attractive alternative for quality control of pharmaceuticals.
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Affiliation(s)
- José Luis Corujo-Antuña
- Departamento de Química Física y Analítica, Universidad de Oviedo, Julian Claveria 8, Oviedo, Asturias 33006, Spain
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45
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Peng Y, Ding X, Chu Q, Ye J. Determination of Baicalein, Baicalin, and Chlorogenic Acid in Yinhuang Oral Liquid by Capillary Electrophoresis with Electrochemical Detection. ANAL LETT 2003. [DOI: 10.1081/al-120025256] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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46
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Zhang L, Huang W, Wang Z, Cheng J. Determination of histamine by capillary zone electrophoresis with amperometric detection. ANAL SCI 2002; 18:1117-20. [PMID: 12400657 DOI: 10.2116/analsci.18.1117] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Capillary zone electrophoresis was employed for the determination of histamine using end-column amperometric detection with a carbon fiber microelectrode, at a constant potential. The optimum conditions of separation and detection were 10 mmol/L phosphate buffer, pH 5.6 for the buffer solution, 15 kV for the separation voltage, and 1.35 V (versus SCE) for the detection potential. The linear range was from 6.3 x 10(-7) to 1.5 x 1(-5) mol/L with the regression coefficient of 0.9997, and the detection limit was 4.0 x 10(-7) mol/L (S/N = 3). The proposed method was successfully applied to the direct determination of histamine in the beer samples without any sample clean-up procedures.
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Affiliation(s)
- Liyao Zhang
- Department of Chemistry, Wuhan University, China
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Uslu B, Özkan SA, Aboul-Enein HY. SPECTROPHOTOMETRIC DETERMINATION OF MELATONIN AND PYRIDOXINE HCL IN BINARY MIXTURE USING FIRST DERIVATIVE OF THE RATIO SPECTRA METHOD. ANAL LETT 2002. [DOI: 10.1081/al-120016104] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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49
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Chen G, Zhang H, Ye J. Determination of rutin and quercetin in plants by capillary electrophoresis with electrochemical detection. Anal Chim Acta 2000. [DOI: 10.1016/s0003-2670(00)01099-0] [Citation(s) in RCA: 162] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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50
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Determination of monoamine transmitters and tyrosine in biological samples by capillary electrophoresis with electrochemical detection. Chromatographia 2000. [DOI: 10.1007/bf02490443] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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