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Electrooxidation of tetracycline antibiotic demeclocycline at unmodified boron-doped diamond electrode and its enhancement determination in surfactant-containing media. Talanta 2020; 223:121695. [PMID: 33303147 DOI: 10.1016/j.talanta.2020.121695] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 09/18/2020] [Accepted: 09/21/2020] [Indexed: 11/24/2022]
Abstract
In this paper, for the first time, the study of voltammetric determination of tetracycline antibiotic demeclocycline was conducted. The oxidation of compound was investigated using a commercially available boron-doped diamond electrode pretreated electrochemically (anodic and subsequent cathodic). Addition of anionic surfactant, sodium dodecylsulfate (SDS) and cationic surfactant, cetyltrimethylammonium bromide (CTAB) to the demeclocycline-containing electrolyte solution at pH 2.0 and 9.0, respectively, was found to improve the sensitivity of the stripping voltammetric measurements. Employing square-wave stripping mode (after 30 s accumulation at open-circuit condition) in Britton-Robinson buffer, the limits of detection were found to be 1.17 μg mL-1 (2.3 × 10-6 M) for 4 × 10-4 SDS-containing buffer solution at pH 2, and 0.24 μg mL-1 (4.8 × 10-7 M) for 1 × 10-4 CTAB-containing buffer solution at pH 9.0. The feasibility of the developed approach for the quantification of demeclocycline was tested in urine samples.
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Karthikeyan S, Chinnathambi S, Kannan A, Rajakumar P, Velmurugan D, Bharanidharan G, Aruna P, Ganesan S. Investigation of Optical Spectroscopic and Computational Binding Mode of Bovine Serum Albumin with 1, 4-Bis ((4-((4-Heptylpiperazin-1-yl) Methyl)-1H-1, 2, 3-Triazol-1-yl) Methyl) Benzene. J Biochem Mol Toxicol 2015; 29:373-81. [DOI: 10.1002/jbt.21704] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2014] [Revised: 02/03/2015] [Accepted: 03/01/2015] [Indexed: 12/12/2022]
Affiliation(s)
| | | | - Ayyavoo Kannan
- Department of Organic Chemistry, University of Madras; Maraimalai Campus; Chennai 600 025 India
| | - Perumal Rajakumar
- Department of Organic Chemistry, University of Madras; Maraimalai Campus; Chennai 600 025 India
| | - Devadasan Velmurugan
- Bioinformatics Infrastructure Facility; University of Madras; Chennai 600 025 India
- Centre of Advanced Study in Crystallography and Biophysics; University of Madras; Chennai 600 025 India
| | | | - Prakasarao Aruna
- Department of Medical Physics; Anna University; Chennai 600 025 India
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Dordio A, Carvalho AJP. Constructed wetlands with light expanded clay aggregates for agricultural wastewater treatment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2013; 463-464:454-461. [PMID: 23831791 DOI: 10.1016/j.scitotenv.2013.06.052] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 05/29/2013] [Accepted: 06/11/2013] [Indexed: 06/02/2023]
Abstract
Constructed wetlands (CWs) are receiving a renewed attention as a viable phytotechnology for treating agricultural wastewaters and for the removal of more specific pollutants, in particular recalcitrant ones. In this work, the performance of CW mesocosms using light expanded clay aggregates (LECA) as the bed's substrate and planted with Phragmites australis was investigated for treatment of olive mill wastewater (OMW), swine wastewater (SW) contaminated with oxytetracycline and water contaminated with herbicide MCPA (2-methyl-4-chlorophenoxyacetic acid). Both wastewaters (OMW and SW) initially presented high organic matter content and total suspended solids which were removed by the system with efficiencies higher than 80%. Removal of polyphenols in OMW and nitrogen compounds in SW also showed similar or higher efficiencies in comparison with other treatment systems reported in the literature. The antibiotic oxytetracycline was completely removed from SW within the assay period in unplanted LECA beds, but planted beds allowed a significantly faster removal. In regard to water contaminated with MCPA, the results showed that LECA has a large sorption capacity for this herbicide (removal efficiencies of 56-97%). In general, considerably higher pollutant removal efficiencies were obtained when plants were used (up to 28% higher). The results obtained are indicative that CWs with LECA as substrate may be an adequate option for agricultural wastewater treatment.
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Affiliation(s)
- A Dordio
- Chemistry Department, University of Évora, Rua Romão Ramalho 59, 7000-676 Évora, Portugal; IMAR - Marine and Environmental Research Centre, University of Évora, Rua Romão Ramalho 59, 7000-676 Évora, Portugal.
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NO Fluorescence Sensing by Europium Tetracyclines Complexes in the Presence of H2O2. J Fluoresc 2013; 23:681-8. [DOI: 10.1007/s10895-013-1207-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Accepted: 02/24/2013] [Indexed: 01/12/2023]
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Kahsay G, Shraim F, Villatte P, Rotger J, Cassus-Coussère C, Van Schepdael A, Hoogmartens J, Adams E. Development and validation of a reversed phase liquid chromatographic method for analysis of oxytetracycline and related impurities. J Pharm Biomed Anal 2013; 75:199-206. [DOI: 10.1016/j.jpba.2012.11.042] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 11/26/2012] [Accepted: 11/27/2012] [Indexed: 11/25/2022]
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Kahsay G, Maxa J, Van Schepdael A, Hoogmartens J, Adams E. Development and validation of a reversed-phase liquid chromatographic method for analysis of demeclocycline and related impurities. J Sep Sci 2012; 35:1310-8. [PMID: 22733511 DOI: 10.1002/jssc.201101071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A simple, robust, and rapid reversedphase high-performance liquid chromatographic method for the analysis of demeclocycline and its impurities is described. Chromatographic separations were achieved on a Symmetry Shield RP8 (75 mm × 4.6 mm, 3.5 μm) column kept at 40°C. The mobile phase was a gradient mixture of acetonitrile, 0.06 M sodium edetate (pH 7.5), 0.06 M tetrapropylammonium hydrogen sulphate (pH 7.5) and water, A (2:35:35:28 v/v/v/v) and B (30:35:35:0 v/v/v/v) pumped at a flow rate of 1 mL/min. UV detection was performed at 280 nm. The developed method was validated according to the ICH guidelines for specificity, limit of detection, limit of quantification, linearity, precision, and robustness. An experimental design was applied for robustness study. Results show that the peak shape, chromatographic resolution between the impurities, and the total analysis time are satisfactory and better than previous methods. The method has been applied for the analysis of commercial demeclocycline bulk samples available on the market.
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Affiliation(s)
- Getu Kahsay
- Laboratorium voor Farmaceutische Analyse, Faculteit Farmaceutische Wetenschappen, Katholieke Universiteit Leuven, Leuven, Belgium
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TAYYARI SAYYEDFARAMARZ, NEKOEI ABDOREZA, VAKILI MOHAMMAD, HASSANPOUR MASOUD, WANG YANALEXANDER. CONFORMATIONAL STABILITY, MOLECULAR STRUCTURE, AND INTRAMOLECULAR HYDROGEN BONDING OF THENOYLTRIFLUOROACETONE. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s0219633606002556] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Complete conformational analysis of all possible keto and enol forms of thenoyltrifluoroacetone (TTFA) was carried out using density functional theory with the B3LYP functional and the 6-31G**, 6-311G**, and 6-311++G** basis sets. In addition, the geometries and energies of the four most stable chelated conformers and their corresponding open structures were obtained at the MP2/6-31G** level of theory. The energy differences between the four stable chelated enol conformers, in the gas phase, calculated at the B3LYP levels are negligible. However, calculations at the MP2 level indicate that the B2 conformer (the hydroxyl group in the - CF 3 side) is significantly more stable than others, in agreement with the X-ray diffraction results. The calculated intramolecular hydrogen bond (IHB) energy E HB and the strength of the bond have been compared, and an imperfection in the prevalent method of evaluating E HB has been perceived. The IHB of TTFA was compared with those in several β-dicarbonyls.
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Affiliation(s)
| | - ABDO-REZA NEKOEI
- Chemistry Department, Ferdowsi University, Mashhad 91774-1436, Iran
| | - MOHAMMAD VAKILI
- Chemistry Department, Ferdowsi University, Mashhad 91774-1436, Iran
| | - MASOUD HASSANPOUR
- Chemistry Department, Khayyam Higher Education Center, Mashhad 91897, Iran
| | - YAN ALEXANDER WANG
- Chemistry Department, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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Zhang P, Lan P, Ma Y, Gao Y, Chen H, Fang Q, Zong W, Liu R. Spectroscopic investigation on the interaction of Cr(VI) with bovine serum albumin. J Biochem Mol Toxicol 2011; 26:54-9. [DOI: 10.1002/jbt.20398] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Revised: 04/24/2011] [Accepted: 05/06/2011] [Indexed: 11/06/2022]
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Liu R, Qin P, Wang L, Zhao X, Liu Y, Hao X. Toxic effects of ethanol on bovine serum albumin. J Biochem Mol Toxicol 2010; 24:66-71. [DOI: 10.1002/jbt.20314] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Lozano VA, Ibañez GA, Olivieri AC. Three-way partial least-squares/residual bilinearization study of second-order lanthanide-sensitized luminescence excitation-time decay data. Anal Chim Acta 2008; 610:186-95. [DOI: 10.1016/j.aca.2008.01.046] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2007] [Revised: 01/10/2008] [Accepted: 01/11/2008] [Indexed: 11/15/2022]
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Santiago Valverde R, Sánchez Pérez I, Franceschelli F, Martínez Galera M, Gil García MD. Determination of photoirradiated tetracyclines in water by high-performance liquid chromatography with chemiluminescence detection based reaction of rhodamine B with cerium (IV). J Chromatogr A 2007; 1167:85-94. [PMID: 17765910 DOI: 10.1016/j.chroma.2007.08.043] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2007] [Revised: 08/13/2007] [Accepted: 08/15/2007] [Indexed: 11/18/2022]
Abstract
A simple, selective and sensitive method has been developed for the simultaneous determination of tetracycline, oxytetracycline, chlorotetracycline, demeclocycline, doxycycline and meclocycline based on reversed-phase high-performance liquid chromatography with chemiluminescence detection. The procedure was based on the chemiluminescent enhancement by photoirradiated tetracyclines of the cerium (IV)-rhodamine B system in sulphuric acid medium. The six tetracyclines were separated on an Aquasil-C18 column with a gradient elution using a mixture of acetonitrile and 0.1 mol L(-1) phosphate buffer as mobile phase, photoderivatized using a photoreactor consisting of a tube reactor coil of PFA and a 8W Xenon lamp. Under the optimized conditions, the method was validated with respect to linearity, precision, limits of detection and quantification and accuracy. The relative standard deviation (RSD) on intra-day precision was below 10% and detection limits ranged between 0.12 and 0.34 microg L(-1). The proposed method has been successfully applied to the determination of tetracyclines in surface water samples. A possible mechanism of the chemiluminescence in the system is discussed.
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Affiliation(s)
- R Santiago Valverde
- Department of Analytical Chemistry, Faculty of Experimental Sciences, University of Almeria, 04061 Almeria, Spain
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Highly collinear three-way photoinduced spectrofluorimetric data arrays modelled with bilinear least-squares: Determination of tetracyclines in surface water samples. Talanta 2006; 70:774-83. [DOI: 10.1016/j.talanta.2006.01.037] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2005] [Revised: 01/24/2006] [Accepted: 01/24/2006] [Indexed: 11/20/2022]
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Valverde RS, García MDG, Galera MM, Goicoechea HC. Determination of tetracyclines in surface water by partial least squares using multivariate calibration transfer to correct the effect of solid phase preconcentration in photochemically induced fluorescence signals. Anal Chim Acta 2006. [DOI: 10.1016/j.aca.2006.01.035] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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