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Pezhhanfar S, Farajzadeh MA, Hosseini-Yazdi SA, Mogaddam MRA. Streamlined Water-Leaching Preconcentration Method As a Novel Analytical Approach and Its Coupling to Dispersive Micro-Solid-Phase Extraction Based on Synthetically Modified (Fe/Co) Bimetallic MOFs. ACS OMEGA 2024; 9:9185-9201. [PMID: 38434905 PMCID: PMC10905590 DOI: 10.1021/acsomega.3c08218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 02/01/2024] [Accepted: 02/05/2024] [Indexed: 03/05/2024]
Abstract
The streamlined water-leaching preconcentration method is introduced as a novel preconcentration method in this study. The approach has many benefits including low consumption of organic solvent and deionized water and operation time, energy-saving, no need for dispersion or evaporation, and implementation of more efficient preconcentration. Also, a methodological study was done on the synthesis of (Fe/Co) bimetallic-organic framework that eased the synthesis procedure, decreased its time, and enhanced its analytical performance by increasing its surface area, total pore volume, and average pore diameter parameters. To perform the extraction, bi-MOF particles were added into the solution of interest enriched with sodium sulfate. After vortexing to adsorb the analytes, centrifugation isolated the sorbent particles. A microliter-volume of acetonitrile and 1,2-dibromoethane mixture was used for desorption aim via vortexing. After the separation of the organic phase and transferring it into a conical bottom glass test tube, a milliliter volume of sodium chloride solution was applied to leach the organic phase. A gas chromatograph equipped with a flame ionization detector was applied for the injection of the extracted phase. The method was applied for the extraction and preconcentration of some pesticides from juice samples. Wide linear ranges (5.44-1600 μg L-1), low relative standard deviations (3.1-4.5% for intra- (n = 6) and 3.5-5.2% for interday (n = 4) precisions), high extraction recoveries (61-95%), enrichment factors (305-475), and low limits of detection (0.67-1.65 μg L-1) and quantification (2.21-5.44 μg L-1) were obtained for the developed method.
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Affiliation(s)
- Sakha Pezhhanfar
- Department
of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 51666, Iran
| | - Mir Ali Farajzadeh
- Department
of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 51666, Iran
- Engineering
Faculty, Near East University, 99138 Nicosia, North Cyprus, Mersin 10, Turkey
| | | | - Mohammad Reza Afshar Mogaddam
- Food
and Drug Safety Research Center, Tabriz
University of Medical Sciences, Tabriz 51666, Iran
- Pharmaceutical
Analysis Research Center, Tabriz University
of Medical Sciences, Tabriz 51666, Iran
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2
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Arsawiset S, Sansenya S, Teepoo S. Nanozymes paper-based analytical device for the detection of organophosphate pesticides in fruits and vegetables. Anal Chim Acta 2023; 1267:341377. [PMID: 37257977 DOI: 10.1016/j.aca.2023.341377] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 05/10/2023] [Accepted: 05/14/2023] [Indexed: 06/02/2023]
Abstract
In this work, copper oxide nanoparticles (CuONPs) nanozymes paper-based analytical device was designed for the rapid detection of organophosphate pesticides in fruits and vegetables. The paper-based analytical device was modified with silica oxide nanoparticles to enhance the assay sensitivity. CuO nanozymes displayed peroxidase-like activity and catalyzed the oxidation of o-dianisidine in the presence of H2O2 from the hydrolysis of acetylthiocholine. This results in the formation of a brown-colored product. In the presence of organophosphate pesticides such as malathion, acetylcholinesterase activity was inhibited, resulting in reduced color intensity production, and which was measured with a smartphone. The proposed nanozymes paper-based analytical device exhibited a good linear detection range (0.1-5 mg L-1), a low detection limit of 0.08 mg L-1, and the analysis time was only about 10 min for malathion detection under optimal conditions. Moreover, the CuONPs had excellent catalytic activity and higher stability than peroxidase. Finally, this device can be applied to detect organophosphate pesticides in fruits and vegetables with rapidity, accuracy, portability, and ease of handling in the field.
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Affiliation(s)
- Supattra Arsawiset
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand
| | - Sompong Sansenya
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand
| | - Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand.
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3
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Moradeeya PG, Sharma A, Kumar MA, Basha S. Titanium dioxide based nanocomposites - Current trends and emerging strategies for the photocatalytic degradation of ruinous environmental pollutants. ENVIRONMENTAL RESEARCH 2022; 204:112384. [PMID: 34785207 DOI: 10.1016/j.envres.2021.112384] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 11/07/2021] [Accepted: 11/10/2021] [Indexed: 06/13/2023]
Abstract
Many ruinous pollutants are omnipresent in the environment and among them; pesticides are xenobiotic and pose to be a bio-recalcitrance. Their detrimental ecological and environmental impacts attract attention of environmental excerpts and the surge of stringent regulations have endows the need of a technically feasible treatment. This critical review emphasizes about the occurrence, abundance and fate of structurally distinct pesticides in different environment. The practiced remedial strategies and in particular, the advanced oxidation processes (AOPs) those utilize the photo-catalytic properties of nano-composites for the degradation of pollutants are critically discussed. Photo-catalytic degradation utilizes many composite materials at nano-scale level, wherein synthesis of nano-composites with appropriate precursors and other adjoining functional moieties are of prime importance. Therefore, suitable starter materials along with the reaction conditions are prerequisite for effectively tailoring the nano-composites. The aforementioned aspects and their customized applications are critically discussed. The associated challenges, opportunities and process economics of degradation using photo-catalytic AOP techniques are highlighted and in addition, the review tries to explain how best the photo-degradation can be a stand-alone tool with a societal importance. Conclusively, the future prospects for undertaking new researches in photo-catalytic breakdown of pollutants that can be judiciously sustainable.
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Affiliation(s)
- Pareshkumar G Moradeeya
- Hyderabad Zonal Laboratory, CSIR-National Environmental Engineering Research Institute, IICT Campus, Tarnaka, Hyderabad, 500 007, Telangana, India; Department of Environmental Science & Engineering, Marwadi Education Foundation, Rajkot, 360 003, Gujarat, India
| | - Archana Sharma
- Department of Environmental Science & Engineering, Marwadi Education Foundation, Rajkot, 360 003, Gujarat, India
| | - Madhava Anil Kumar
- Analytical and Environmental Science Division & Centralized Instrument Facility, CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, 364 002, Gujarat, India
| | - Shaik Basha
- Hyderabad Zonal Laboratory, CSIR-National Environmental Engineering Research Institute, IICT Campus, Tarnaka, Hyderabad, 500 007, Telangana, India.
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Extraction of Cd2+ from Model Aqueous Solution and Waste Tonner Carbon Using Polypropylene-Supported Liquid Membrane and Na2CO3 as Strippant. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2019. [DOI: 10.1007/s13369-019-03943-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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5
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Daniel D, do Lago CL. Determination of Multiclass Pesticides Residues in Corn by QuEChERS and Capillary Electrophoresis Tandem Mass Spectrometry. FOOD ANAL METHOD 2019. [DOI: 10.1007/s12161-019-01501-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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6
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Farajzadeh MA, Sohrabi H, Mohebbi A, Mogaddam MRA. Combination of a modified quick, easy, cheap, efficient, rugged, and safe extraction method with a deep eutectic solvent based microwave‐assisted dispersive liquid–liquid microextraction: Application in extraction and preconcentration of multiclass pesticide residues in tomato samples. J Sep Sci 2019; 42:1273-1280. [DOI: 10.1002/jssc.201801107] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 01/08/2019] [Accepted: 01/09/2019] [Indexed: 12/26/2022]
Affiliation(s)
- Mir Ali Farajzadeh
- Department of Analytical ChemistryFaculty of ChemistryUniversity of Tabriz Tabriz Iran
- Engineering FacultyNear East University Nicosia Mersin Turkey
| | - Hessamaddin Sohrabi
- Department of Analytical ChemistryFaculty of ChemistryUniversity of Tabriz Tabriz Iran
| | - Ali Mohebbi
- Department of Analytical ChemistryFaculty of ChemistryUniversity of Tabriz Tabriz Iran
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Electrochemical determination of phenothrin in fruit juices at graphene oxide-polypyrrole modified glassy carbon electrode. SENSING AND BIO-SENSING RESEARCH 2018. [DOI: 10.1016/j.sbsr.2018.09.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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8
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Bol’shakova DS, Amelin VG. Determination of pesticides in environmental materials and food products by capillary electrophoresis. JOURNAL OF ANALYTICAL CHEMISTRY 2016. [DOI: 10.1134/s1061934816100026] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Shirani M, Haddadi H, Rezaee M, Semnani A, Habibollahi S. Solid-Phase Extraction Combined with Dispersive Liquid–Liquid Microextraction for the Simultaneous Determination of Deltamethrin and Permethrin in Honey by Gas Chromatography–Mass Spectrometry. FOOD ANAL METHOD 2016. [DOI: 10.1007/s12161-016-0455-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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Wei JC, Hu J, Cao JL, Wan JB, He CW, Hu YJ, Hu H, Li P. Sensitive Detection of Organophosphorus Pesticides in Medicinal Plants Using Ultrasound-Assisted Dispersive Liquid-Liquid Microextraction Combined with Sweeping Micellar Electrokinetic Chromatography. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:932-940. [PMID: 26758524 DOI: 10.1021/acs.jafc.5b05369] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A simple, rapid, and sensitive method using ultrasound-assisted dispersive liquid-liquid microextraction (UA-DLLME) combined with sweeping micellar electrokinetic chromatography (sweeping-MEKC) has been developed for the determination of nine organophosphorus pesticides (chlorfenvinphos, parathion, quinalphos, fenitrothion, azinphos-ethyl, parathion-methyl, fensulfothion, methidathion, and paraoxon). The important parameters that affect the UA-DLLME and sweeping efficiency were investigated. Under the optimized conditions, the proposed method provided 779.0-6203.5-fold enrichment of the nine pesticides compared to the normal MEKC method. The limits of detection ranged from 0.002 to 0.008 mg kg(-1). The relative standard deviations of the peak area ranged from 1.2 to 6.5%, indicating the good repeatability of the method. Finally, the developed UA-DLLME-sweeping-MEKC method has been successfully applied to the analysis of the investigated pesticides in several medicinal plants, including Lycium chinense, Dioscorea opposite, Codonopsis pilosula, and Panax ginseng, indicating that this method is suitable for the determination of trace pesticide residues in real samples with complex matrices.
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Affiliation(s)
- Jin-Chao Wei
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau , Macau 999078, People's Republic of China
| | - Ji Hu
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau , Macau 999078, People's Republic of China
| | - Ji-Liang Cao
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau , Macau 999078, People's Republic of China
| | - Jian-Bo Wan
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau , Macau 999078, People's Republic of China
| | - Cheng-Wei He
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau , Macau 999078, People's Republic of China
| | - Yuan-Jia Hu
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau , Macau 999078, People's Republic of China
| | - Hao Hu
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau , Macau 999078, People's Republic of China
| | - Peng Li
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau , Macau 999078, People's Republic of China
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11
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The evolution of analytical chemistry methods in foodomics. J Chromatogr A 2016; 1428:3-15. [DOI: 10.1016/j.chroma.2015.09.007] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 07/26/2015] [Accepted: 09/02/2015] [Indexed: 12/18/2022]
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12
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The role of derivatization techniques in the analysis of glyphosate and aminomethyl-phosphonic acid by chromatography. Microchem J 2015. [DOI: 10.1016/j.microc.2015.02.007] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Elbashir AA, Aboul-Enein HY. Separation and analysis of triazine herbcide residues by capillary electrophoresis. Biomed Chromatogr 2014; 29:835-42. [DOI: 10.1002/bmc.3381] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2014] [Revised: 09/30/2014] [Accepted: 10/07/2014] [Indexed: 01/16/2023]
Affiliation(s)
- Abdalla A. Elbashir
- Chemistry Department, Faculty of Science; University of Khartoum; Khartoum 11115 Sudan
| | - Hassan Y. Aboul-Enein
- Pharmaceutical and Medicinal Chemistry Department, Pharmaceutical and Drug Industries Research Division; National Research Centre; Dokki Cairo 12311 Egypt
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Grodner B, Łukaszkiewicz J, Kuran B, Krawiecka M. Capillary electrophoresis separation of aminoalkanol derivatives of 1,7-dimethyl-8,9-diphenyl-4-azatricyclo[5.2.1.0(2,6)]dec-8-ene-3,5,10-trione as potential anticancer drugs. J Sep Sci 2014; 37:3564-70. [PMID: 25280228 DOI: 10.1002/jssc.201400790] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 09/12/2014] [Accepted: 09/16/2014] [Indexed: 12/17/2022]
Abstract
The purpose of this study, the direct separation of aminoalkanol derivatives I and II of 1,7-dimethyl-8,9-diphenyl-4-azatricyclo[5.2.1.0(2,6) ]dec-8-ene-3,5,10-trione, which was found in earlier studies as potential anticancer drugs, were performed. Capillary electrophoresis offers the possibility of fast, cheap, and reproducible separations for compounds I and II. In this paper, the simultaneous separation of I and II by capillary zone electrophoresis has been achieved within 8 min by use of 50 mM phosphate buffer of pH 2.5. Analysis of the two compounds in the serum plasma standards was conducted. Limits of detection of I and II by UV absorbance at 200 nm were achieved in the range of 156.3-156.6 ng/mL. The method was validated for linearity, accuracy, precision, limits of detection, and quantification. The calibration equation revealed a good linear relationship (r(2) = 0.998-0.999). Sufficient recovery was observed in the range of 96.3-99.5%. The method showed good reproducibility with intra- and interday precision of 0.97 and 1.76%, respectively. The quantification limits for the compounds were in the range of 477.0-479.8 ng/mL. The proposed method was applied to the analysis of real serum samples.
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Affiliation(s)
- Błażej Grodner
- Chair and Department of Biochemistry and Clinical Chemistry, Medical University of Warsaw, Warsaw, Poland
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Rezaee M, Mashayekhi HA, Saleh A, Abdollahzadeh Y, Naeeni MH, Fattahi N. Determination of abamectin in citrus fruits using SPE combined with dispersive liquid-liquid microextraction and HPLC-UV detection. J Sep Sci 2013; 36:2629-34. [DOI: 10.1002/jssc.201300356] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Revised: 05/13/2013] [Accepted: 05/21/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Mohammad Rezaee
- Nuclear Fuel Cycle Research School, Nuclear Science & Technology Research Institute; Atomic Energy Organization of Iran; Tehran Iran
| | | | - Abolfazl Saleh
- Department of Marine Living Resources; Iranian National Institute for Oceanography; Tehran Iran
| | | | | | - Nazir Fattahi
- Department of Chemistry; Razi University; Kermanshah Iran
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Zhang Y, Jiao B. Dispersive liquid-liquid microextraction combined with online preconcentration MEKC for the determination of some phenoxyacetic acids in drinking water. J Sep Sci 2013; 36:3067-74. [PMID: 23897833 DOI: 10.1002/jssc.201300290] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 06/08/2013] [Accepted: 06/13/2013] [Indexed: 11/08/2022]
Abstract
A fast and simple technique composed of dispersive liquid-liquid microextraction (DLLME) and online preconcentration MEKC with diode array detection was developed for the determination of four phenoxyacetic acids, 2,4,5-trichlorophenoxyacetic acid, 2,4-dichlorophenoxyacetic acid, 2,6-dichlorophenoxyacetic acid, and 4-chlorophenoxyacetic acid, in drinking water. The four phenoxyacetic acids were separated in reversed-migration MEKC to the baseline. About 145-fold increases in detection sensitivity were observed with online concentration strategy, compared with standard hydrodynamic injection (5 s at 25 mbar pressure). LODs ranged from 0.002 to 0.005 mg/L using only the online preconcentration procedures without any offline concentration of the extract. A DLLME procedure was used in combination with the proposed online preconcentration strategies, which achieved the determination of analytes at limits of quantification ranging from 0.2 to 0.5 μg/kg, which is far lower than the maximum residue limits established by China. The satisfactory recoveries obtained by DLMME spiked at two levels ranged from 67.2 to 99.4% with RSD <15%, making this proposed method suitable for the determination of phenoxyacetic acids in water samples.
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Affiliation(s)
- Yaohai Zhang
- Citrus Research Institute Southwest University/Laboratory of Citrus Quality and Safety Risk Assessment, Ministry of Agriculture/Key Laboratory of Horticulture Science for Southern Mountainous Regions of Ministry of Education, Southwest University, Chongqing, China
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Zhang K, Hu D, Zhu H, Yang J, Wu J, He M, Jin L, Yang S, Song B. Enantioselective hydrolyzation and photolyzation of dufulin in water. Chem Cent J 2013; 7:86. [PMID: 23680125 PMCID: PMC3663813 DOI: 10.1186/1752-153x-7-86] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Accepted: 05/13/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Dufulin is a novel, highly effective antiviral agent that activatives systemic acquired resistance of plants. This compound is widely used in China to prevent and control viral diseases in tobacco, vegetable and rice. Dufulin can treat plants infected by the tobacco mosaic virus and the cucumber mosaic virus. However, the achiral analysis and residue determination of dufulin remain underdeveloped because of its high enantioselectivity rates and high control costs. The enantioselectivity of an antiviral compound is an important factor that should be considered when studying the effect of chiral pesticides on the environment. The enantioselective degradation of dufulin in water remains an important objective in pesticide science. RESULTS The configuration of dufulin enantiomers was determined in this study based on its circular dichroism spectra. The S-(+)-dufulin and R-(-)-dufulin enantiomers were separated and identified using an amylose tris-(3,5-dimethylphenylcarbamate) chiral column by normal phase high-performance liquid chromatography. The degradation of the rac-dufulin racemate and its separate enantiomers complied with first-order reaction kinetics and demonstrated acceptable linearity. The enantioselective photolysis of rac-dufulin allowed for the faster degradation of R-(-)-dufulin, as compared with S-(+)-dufulin. However, S-(+)-dufulin was hydrolyzed faster than its antipode. CONCLUSION The photolysation and hydrolyzation of dufulin in water samples normally complied with the first-order kinetics and demonstrated acceptable linearity (R2>0.66). A preferential photolysation of the R-(-)-enantiomer was observed in water samples. Moreover, the S-(+)-enantiomer was hydrolyzed faster than its antipode.
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Affiliation(s)
- Kankan Zhang
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China.
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Uthuppu B, Aamand J, Jørgensen C, Kiersgaard SM, Kostesha N, Jakobsen MH. Optimization of an immunoassay of 2,6-dichlorobenzamide (BAM) and development of regenerative surfaces by immunosorbent modification with newly synthesised BAM hapten library. Anal Chim Acta 2012; 748:95-103. [DOI: 10.1016/j.aca.2012.08.047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2011] [Revised: 07/30/2012] [Accepted: 08/28/2012] [Indexed: 11/26/2022]
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19
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Huang X, Yi L, Gao Z, Li H. Determination of Seven Active Ingredients in Three Plant Essential Oils by Using Micellar Electrokinetic Chromatography. ANAL LETT 2012. [DOI: 10.1080/00032719.2012.680058] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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20
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Kumar A, Malik AK, Picó Y. Sample preparation methods for the determination of pesticides in foods using CE-UV/MS. Electrophoresis 2010; 31:2115-25. [DOI: 10.1002/elps.201000021] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Pressurised liquid extraction and capillary electrophoresis–mass spectrometry for the analysis of pesticide residues in fruits from Valencian markets, Spain. Food Chem 2010. [DOI: 10.1016/j.foodchem.2009.11.071] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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22
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Characteristics and enantiomeric analysis of chiral pyrethroids. J Chromatogr A 2010; 1217:968-89. [DOI: 10.1016/j.chroma.2009.10.069] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2009] [Revised: 10/16/2009] [Accepted: 10/23/2009] [Indexed: 11/18/2022]
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23
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Aturki Z, D’Orazio G, Fanali S, Rocco A, Bortolotti F, Gottardo R, Tagliaro F. Capillary electrochromatographic separation of illicit drugs employing a cyano stationary phase. J Chromatogr A 2009; 1216:3652-9. [DOI: 10.1016/j.chroma.2008.12.041] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2008] [Revised: 12/03/2008] [Accepted: 12/15/2008] [Indexed: 11/15/2022]
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Paz JL, Catalá-Icardo M. Flow injection-photoinduced-chemiluminescence determination of ziram and zineb. Anal Chim Acta 2008; 625:173-9. [DOI: 10.1016/j.aca.2008.07.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2008] [Revised: 07/14/2008] [Accepted: 07/17/2008] [Indexed: 10/21/2022]
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25
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Liu P, He W, Zhao Y, Wang PA, Sun XL, Li XY, Zhang SY. Synthesis of chiral vicinal diols and analysis of them by capillary zone electrophoresis. Chirality 2008; 20:75-83. [PMID: 18058863 DOI: 10.1002/chir.20500] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This paper describes an improved access to 1,4-bis (9-O-quininyl) phthalazine [(QN)(2)PHAL], a very useful chiral ligand for catalytic asymmetric dihydroxylation (AD), by using CaH(2) as acid-binding reagent in a high yield under mild conditions. The application of (QN)(2)PHAL to the AD reactions of eight olefins exhibited excellent enantioselectivity and activity with corresponding chiral vicinal diols. Furthermore, a capillary zone electrophoresis method was developed to separate the aforementioned chiral vicinal diols by using of neutral beta-cyclodextrin (beta-CD) as chiral selector and borate as running buffer. High resolution was achieved under the optimal conditions of beta-CD 2.2% (w/v), pH 10, 200 mM borate buffer at 15 kV, and 20 degrees C within 15 min. The relative standard deviations of the corrected peak areas and migration time were less than 3.9% and 1.3%, respectively. In addition, the developed method was successfully applied to the determination of the purity and the enantiomeric excesses value (%ee) of the AD reaction products.
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Affiliation(s)
- Peng Liu
- Research Center for Chirotechnology, Fourth Military Medical University, X'ian, Shaanxi, China
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Chicharro M, Bermejo E, Ongay S, Zapardiel A. Determination of Maleic Hydrazide in Potato Samples Using Capillary Electrophoresis with Dual Detection (UV-Electrochemical). ELECTROANAL 2008. [DOI: 10.1002/elan.200704090] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Ravelo-Pérez LM, Hernández-Borges J, Borges-Miquel TM, Rodríguez-Delgado MA. Multiple pesticide analysis in wine by MEKC combined with solid-phase microextraction and sample stacking. Electrophoresis 2008; 28:4072-81. [PMID: 17957661 DOI: 10.1002/elps.200700251] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In this work, a new method for the determination in white wines of 12 pesticides widely used in vine cultivars (namely, carbendazim, pirimicarb, metalaxyl, pyrimethanil, procymidone, nuarimol, azoxystrobin, tebufenozide, fenarimol, benalaxyl, penconazole, and tetradifon) using solid-phase microextraction (SPME) and MEKC with diode-array detection (DAD) was developed. The MEKC buffer consisted of 100 mM sodium tetraborate and 30 mM SDS at pH 8.5 with 6% v/v 1-propanol. Reversed-electrode polarity stacking mode (REPSM) was applied as on-line preconcentration strategy. In order to carry out an effective and sensitive determination of these pesticides in wine samples, an off-line SPME procedure was optimized by means of an experimental design. After studying the extraction performance of different SPME coatings, PDMS/divinylbenzene (PDMS/DVB) fibers were found the most appropriate for the extraction of most of these pesticides. Carbendazim and metalaxyl could not be extracted from wine samples. Calibration curves for extracted standards and fortified white wines were studied in order to determine the presence of a matrix effect. The combination of both preconcentration procedures (SPME and REPSM) allowed the determination of ten of these pesticides in white wines at concentrations between 0.054 and 0.113 mg/L. (i.e., levels well below the maximum residue limits (MRLs) allowed for these compounds in wine grapes). Ten homemade wines were they analyzed with the optimized method demonstrating the usefulness of the proposed procedure.
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Affiliation(s)
- Lidia M Ravelo-Pérez
- Department of Analytical Chemistry, Nutrition and Food Science, University of La Laguna, La Laguna, Tenerife, Canary Islands, Spain
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Moral A, Sicilia MD, Rubio S, Pérez-Bendito D. Multifunctional sorbents for the extraction of pesticide multiresidues from natural waters. Anal Chim Acta 2008; 608:61-72. [DOI: 10.1016/j.aca.2007.11.048] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2007] [Revised: 11/29/2007] [Accepted: 11/30/2007] [Indexed: 10/22/2022]
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29
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Garrison AW, Schmitt-Kopplin P, Avants JK. Analysis of the enantiomers of chiral pesticides and other pollutants in environmental samples by capillary electrophoresis. Methods Mol Biol 2008; 384:157-170. [PMID: 18392570 DOI: 10.1007/978-1-59745-376-9_8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The generic method described here involves typical capillary electrophoresis (CE) techniques, with the addition of cyclodextrin chiral selectors to the electrolyte for enantiomer separation and also, in the case of neutral analytes, the further addition of a micelle-forming compound such as sodium dodecyl sulfate (SDS) for separation by the micellar electrokinetic chromatography (MEKC) mode of CE. This generic method has broad application for the separation and analysis of enantiomers of chiral pesticides and other small molecules in a variety of environmental matrices. Aqueous samples such as surface water are analyzed after simple filtration, but centrifugation is sometimes necessary for soil-water slurry samples. Soils and sediment must be extracted with a polar organic solvent such as methanol, which needs only to be evaporated to near dryness, diluted with water, and filtered before CE analysis. Simple borate or phosphate-based buffers are usually used in the CE electrolyte. The method must be optimized for the electrolyte composition, including the correct chiral selector and its concentration, as well as for column conditions and instrumental variables such as voltage. Specific methodologies for application of this generic CE method to follow the enantioselective microbial transformation of ruelene, a neutral organophosphorus insecticide, dichlorprop, an ionic phenoxyalkanoic acid herbicide, and bromochloroacetic acid, a drinking water disinfection byproduct, are provided.
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Affiliation(s)
- Arthur W Garrison
- US Environmental Protection Agency, National Exposure Research Laboratory, Athens, GA, USA
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Ravelo-Pérez LM, Hernández-Borges J, Borges-Miquel TM, Rodríguez-Delgado MÁ. Pesticide analysis in rose wines by micellar electrokinetic chromatography. J Sep Sci 2007; 30:3240-6. [DOI: 10.1002/jssc.200700288] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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31
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Hernández Borges J, Ravelo-Pérez LM, Hernández-Suárez EM, Carnero A, Rodríguez-Delgado MÁ. Determination of Abamectin Residues in Avocados by Microwave-Assisted Extraction and HPLC with Fluorescence Detection. Chromatographia 2007. [DOI: 10.1365/s10337-007-0442-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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32
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García-Cañas V, Cifuentes A. Detection of microbial food contaminants and their products by capillary electromigration techniques. Electrophoresis 2007; 28:4013-30. [DOI: 10.1002/elps.200700253] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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33
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Boyce MC. Determination of additives and organic contaminants in food by CE and CEC. Electrophoresis 2007; 28:4046-62. [DOI: 10.1002/elps.200700280] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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34
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Ravelo-Pérez LM, Hernández-Borges J, Cifuentes A, Rodríguez-Delgado MA. MEKC combined with SPE and sample stacking for multiple analysis of pesticides in water samples at the ng/L level. Electrophoresis 2007; 28:1805-14. [PMID: 17476718 DOI: 10.1002/elps.200600526] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In this work, a new multiresidue analytical method based on MEKC with UV detection combined with SPE as off-line preconcentration strategy, and reversed-electrode polarity stacking mode (REPSM) as on-line stacking procedure, has been developed for the monitoring of 12 pesticides (carbendazim, pirimicarb, metalaxyl, pyrimethanil, procymidone, nuarimol, azoxystrobin, tebufenozide, fenarimol, benalaxyl, penconazole, and tetradifon) that are currently being used in the Canary Islands (Spain). The optimized MEKC buffer, consisting of 100 mM sodium tetraborate and 30 mM SDS at pH 8.5 with 6% v/v 1-propanol, provided baseline resolution of the 12 pesticides in less than 20 min. The developed method was applied to the analysis of mineral, stagnant, and tap water samples. The proposed SPE-REPSM-MEKC-UV method showed high extraction efficiencies with detection limits (LODs) at the low ng/L level providing LOD values down to 64 ng/L for these real samples.
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Affiliation(s)
- Lidia M Ravelo-Pérez
- Department of Analytical Chemistry, Nutrition and Food Science, University of La Laguna, La Laguna, Tenerife, Canary Islands, Spain
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Hernández-Borges J, Ravelo-Pérez LM, Hernández-Suárez EM, Carnero A, Rodríguez-Delgado MA. Analysis of abamectin residues in avocados by high-performance liquid chromatography with fluorescence detection. J Chromatogr A 2007; 1165:52-7. [PMID: 17681518 DOI: 10.1016/j.chroma.2007.07.033] [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: 04/30/2007] [Revised: 07/16/2007] [Accepted: 07/19/2007] [Indexed: 11/24/2022]
Abstract
In this work an analytical method for the determination of abamectin residues in avocados is developed using high-performance liquid chromatography (HPLC) with fluorescence (FL) detection. A pre-column derivatization with trifluoroacetic anhydride (TFAA) and N-methylimidazole (NMIM) was carried out. The mobile phase consisted of water, methanol and acetonitrile (5:47.5:47.5 v/v/v) and was pumped at a rate of 1 mL/min (isocratic elution). The fluorescence detector was set at an excitation wavelength of 365 nm and an emission wavelength of 470 nm. Homogenized avocado samples were extracted twice with acetonitrile:water 8:2 (v/v) and cleaned using C(18) solid-phase extraction (SPE) cartridges. Recovery values were in the range 87-98% with RSD values lower than 13%. The limits of detection (LODs) and quantification (LOQs) of the whole method were 0.001 and 0.003 mg/kg, respectively. These values are lower than the maximum residue limit (MRL) established by the European Union (EU) and the Spanish legislation in avocado samples.
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Affiliation(s)
- Javier Hernández-Borges
- Departamento de Protección Vegetal, Instituto Canario de Investigaciones Agrarias, Apdo. 60, 38200 La Laguna, Tenerife, Islas Canarias, Spain
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Juan-García A, Font G, Picó Y. On-line preconcentration strategies for analyzing pesticides in fruits and vegetables by micellar electrokinetic chromatography. J Chromatogr A 2007; 1153:104-13. [PMID: 17306816 DOI: 10.1016/j.chroma.2007.01.129] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2006] [Revised: 12/24/2006] [Accepted: 01/18/2007] [Indexed: 11/28/2022]
Abstract
Five pesticides (fludioxonil, procymidone, pyriproxyfen, dinoseb and carbendazim) were separated in reversed migration micellar electrokinetic chromatography (RM-MEKC) using 20 mmol l(-1) phosphate buffer at pH 2.3, containing 25 mmol l(-1) sodium dodecylsulfate and 10% methanol. Three on-line concentration strategies, sweeping (SW), normal stacking with reversed migration and a water plug (SRW) and stacking with reverse migration and removal of sample matrix using polarity switching (SRMM), were compared. About 10-, 30- and 50-fold increases in detection sensitivity, compared with standard hydrodynamic injection (5 s at 0.5 psi), were observed with SW, SRW and SRMM, respectively. Limits of detection (LODs) ranged from 0.002 to 0.03 microg ml(-1) using only the on-line preconcentration procedures without any off-line concentration of the extract. A solid-phase extraction (SPE) procedure, for previous isolation and concentration of the analytes, was used in combination with any of the proposed on-line preconcentration strategies, which achieves the determination of pesticides at limits of quantification (LOQs) lower than 0.01 mg kg(-1). The recoveries obtained by SPE in samples spiked at 0.01 mg kg(-1) were between 70 and 100%, with RSDs between 10 and 18% using SRMM. Samples of fruits and vegetables were taken from the market, extracted by the proposed procedure and analyzed with RM-MEKC with the on-line strategies.
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Affiliation(s)
- Ana Juan-García
- Laboratori de Bromatologia i Toxicologia, Facultat de Farmàcia, Universitat de València, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, València, Spain
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37
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Molina-Mayo C, Hernández-Borges J, Borges-Miquel TM, Rodríguez-Delgado MA. Determination of pesticides in wine using micellar electrokinetic chromatography with UV detection and sample stacking. J Chromatogr A 2007; 1150:348-55. [PMID: 16828783 DOI: 10.1016/j.chroma.2006.06.071] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2006] [Revised: 06/16/2006] [Accepted: 06/21/2006] [Indexed: 10/24/2022]
Abstract
In this work, the analysis of a group of four fungicides (pyrimethanil, nuarimol, procymidone and cyprodinil) and one insecticide (pirimicarb) by micellar electrokinetic chromatography (MEKC) with UV detection using the on-line preconcentration strategy called reversed electrode polarity stacking mode (REPSM) is proposed. After optimisation, an adequate separation electrolyte for the separation and stacking of these pesticides was obtained which consisted of 100 mM borate, 60 mM sodium dodecyl sulphate (SDS), at pH 9.0 and 2% 2-propanol. The use of this running buffer together with the REPSM preconcentration method provided limits of detection (LODs) between 38.3 and 241 microg/L. In order to apply the developed methodology for the analysis of these pesticides in wine samples, several off-line preconcentration strategies (mainly, solid-phase extraction, SPE, and solid-phase microextraction, SPME) were tested. Although the use of a SPE procedure, optimized in this work for water samples, using Oasis HLB cartridges, provided mean recovery values between 79 and 100% for spiked water samples, it could not be applied to the extraction of these pesticides from wine samples due to high interference from the sample matrix. However, the use of a SPME procedure using polydimethylsiloxane/divynilbenzene (PDMS/DVB) fibers allowed the selective extraction of four of the five pesticides which could be perfectly determined. The final combination of the off-line SPME and on-line REPSM preconcentration strategies allowed obtaining LODs between 17.6 and 32.3 microg/L.
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Affiliation(s)
- Carlos Molina-Mayo
- Department of Analytical Chemistry, Nutrition and Food Science, University of La Laguna, Avda. Astrofísico Fco. Sánchez s/n, 38071 La Laguna, Tenerife, Canary Islands, Spain
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38
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Picó Y, Fernández M, Ruiz MJ, Font G. Current trends in solid-phase-based extraction techniques for the determination of pesticides in food and environment. ACTA ACUST UNITED AC 2007; 70:117-31. [PMID: 17175029 DOI: 10.1016/j.jbbm.2006.10.010] [Citation(s) in RCA: 138] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2006] [Accepted: 10/27/2006] [Indexed: 10/23/2022]
Abstract
Solid-phase extraction (SPE) procedures for pesticide residues in food and environment are reviewed and discussed. The use of these procedures, which include several approaches such as: matrix solid-phase dispersion (MSPD), solid-phase micro-extraction (SPME) and stir-bar sorptive extraction (SBSE), represents an opportunity to reduce analysis time, solvent consumption, and overall cost. SPE techniques differ from solvent extraction depending on the interactions between a sorbent and the pesticide. This interaction may be specific for a particular pesticide, as in the interaction with an immunosorbent, or non-specific, as in the way a number of different pesticides are adsorbed on apolar or polar materials. A variety of applications were classified according to the method applied: conventional SPE, SPME, hollow-fiber micro-extraction (HFME), MSPD and SBSE. Emphasis is placed on the multiresidue analysis of liquid and solid samples.
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Affiliation(s)
- Yolanda Picó
- Laboratori de Bromatologia i Toxicologia, Facultat de Farmácia, Universitat de Valencia, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
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39
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Galhiane MS, Rissato SR, Apon BM. Design of a Simple Detection Cell with Extended Optical Path Length for Capillary Electrophoresis: Application to Multiresidue Pesticide Analysis. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070500187533] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Mário S. Galhiane
- a Department of Chemistry , Paulista State University (UNESP) , Bauru (SP), Brazil
| | - Sandra R. Rissato
- a Department of Chemistry , Paulista State University (UNESP) , Bauru (SP), Brazil
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40
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Hernández-Borges J, Borges-Miquel TM, Rodríguez-Delgado MA, Cifuentes A. Sample treatments prior to capillary electrophoresis-mass spectrometry. J Chromatogr A 2006; 1153:214-26. [PMID: 17098242 DOI: 10.1016/j.chroma.2006.10.070] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2006] [Revised: 10/13/2006] [Accepted: 10/30/2006] [Indexed: 10/23/2022]
Abstract
Sample preparation is a crucial part of chemical analysis and in most cases can become the bottleneck of the whole analytical process. Its adequacy is a key factor in determining the success of the analysis and, therefore, careful selection and optimization of the parameters controlling sample treatment should be carried out. This work revises the different strategies that have been developed for sample preparation prior to capillary electrophoresis-mass spectrometry (CE-MS). Namely the present work presents an exhaustive and critical revision of the different samples treatments used together with on-line CE-MS including works published from January 2000 to July 2006.
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Affiliation(s)
- Javier Hernández-Borges
- Department of Analytical Chemistry, Nutrition and Food Science, University of La Laguna, Avda. Astrofísico Fco. Sánchez s/n, 38071 La Laguna, Tenerife, Spain.
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41
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Ravelo-Pérez LM, Hernández-Borges J, Rodríguez-Delgado MA. Pesticides analysis by liquid chromatography and capillary electrophoresis. J Sep Sci 2006; 29:2557-77. [PMID: 17313096 DOI: 10.1002/jssc.200600201] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Nowadays, a wide range of pesticides are used in agricultural production, and their monitoring in samples of environmental and alimentary interest is of extreme importance to ensure, among others, the safety of consumption of foods. The aim of this work is to provide updated information about the major developments in CE and HPLC in pesticide analysis, covering relevant publications between 2004 and early 2006. The use of different sample pretreatment steps to provide a suitable extraction of these compounds from the different matrices as well as to increase the sensitivity of the determination is also discussed.
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Affiliation(s)
- Lidia María Ravelo-Pérez
- Department of Analytical Chemistry, Nutrition and Food Science, University of La Laguna, La Laguna, Tenerife, Canary Islands, Spain
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42
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Lara FJ, García-Campaña AM, Gámiz-Gracia L, Bosque-Sendra JM, Alés-Barrero F. Determination of phenothiazines in pharmaceutical formulations and human urine using capillary electrophoresis with chemiluminescence detection. Electrophoresis 2006; 27:2348-59. [PMID: 16718647 DOI: 10.1002/elps.200500863] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A CE instrument coupled with chemiluminescence (CL) detection was designed for the determination of promethazine hydrochloride (PTH) and promazine hydrochloride (PMH) in real samples. An important enhancement of the CL emission of luminol with potassium ferricyanide was observed in the presence of these phenothiazines; so this system was selected for their detection after CE separation. Parameters affecting the electrophoretic separation were optimized in a univariate way, while those affecting CL detection were optimized by means of a multivariate approach based on the use of experimental designs. Chemometrics was also employed for the study of the robustness of the factors influencing the postcolumn CL detection. The method allows the separation of the phenothiazines in less than 4 min, achieving LODs of 80 ng/mL for PMH and 334 ng/mL for PTH, using sample injection by gravity. Electrokinetic injection was used to obtain lower LODs for the determination of the compounds in biological samples. The applicability of the CE-CL method was illustrated in the determination of PTH in pharmaceutical formulations and in the analysis of PMH in human urine, using a previous SPE procedure, achieving an LOD of 1 ng/mL and recoveries higher than 85%.
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Affiliation(s)
- Francisco J Lara
- Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Granada, Spain
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43
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Santana Rodríguez JJ, Halko R, Betancort Rodríguez JR, Aaron JJ. Environmental analysis based on luminescence in organized supramolecular systems. Anal Bioanal Chem 2006; 385:525-45. [PMID: 16601954 DOI: 10.1007/s00216-006-0342-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2005] [Revised: 01/26/2006] [Accepted: 01/27/2006] [Indexed: 11/26/2022]
Abstract
The use of organized supramolecular systems-including micellar media and cyclodextrin inclusion complexes-combined with luminescence techniques in the study and determination of compounds and elements of environmental interest from 1990 to 2005 is reviewed. Analyses of environmental samples performed using fluorescence, photochemically induced fluorescence and phosphorescence spectroscopy as well as liquid chromatography, capillary electrophoresis and flow injection with luminescence detection in the presence of these organized media are described in detail.
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Affiliation(s)
- J J Santana Rodríguez
- Department of Chemistry, Faculty of Marine Sciences, University of Las Palmas de G.C., 35017 Las Palmas, Spain
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44
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Dabek-Zlotorzynska E, Celo V. Recent advances in capillary electrophoresis and capillary electrochromatography of pollutants. Electrophoresis 2006; 27:304-22. [PMID: 16315167 DOI: 10.1002/elps.200500547] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Recent advances in the CE and CEC separation, detection, and sample preparation methodologies applied to the determination of a variety of compounds having current or potential environmental relevance have been overviewed. The reviewed literature has illustrated the wide range of CE applications, indicating the continuing interest in CE and CEC in the environmental field.
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Affiliation(s)
- Ewa Dabek-Zlotorzynska
- Analysis and Air Quality Division, Environmental Technology Centre, Environment Canada, Ottawa, Ontario, Canada.
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45
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Kodama S, Saito Y, Chinaka S, Yamamoto A, Hayakawa K. Chiral Capillary Electrophoresis of Agrochemicals in Real Samples. ACTA ACUST UNITED AC 2006. [DOI: 10.1248/jhs.52.489] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | | | - Satoshi Chinaka
- Forensic Science Laboratory, Ishikawa Prefectural Police Headquarters
| | - Atsushi Yamamoto
- Department of Biological Chemistry, College of Bioscience and Biotechnology, Chubu University
| | - Kazuichi Hayakawa
- Graduate School of Natural Science and Technology, Kanazawa University
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46
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Huertas-Pérez JF, del Olmo Iruela M, García-Campaña AM, González-Casado A, Sánchez-Navarro A. Determination of the herbicide metribuzin and its major conversion products in soil by micellar electrokinetic chromatography. J Chromatogr A 2006; 1102:280-6. [PMID: 16289086 DOI: 10.1016/j.chroma.2005.10.052] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2005] [Revised: 10/12/2005] [Accepted: 10/13/2005] [Indexed: 11/21/2022]
Abstract
In this paper, a multiresidue method for the analysis in soils of metribuzin (M) and its major conversion products, deaminometribuzin (DA), diketometribuzin (DK) and deaminodiketometribuzin (DADK) is developed. Considering the neutral and charged nature of the molecules, micellar electrokinetic chromatography (MEKC) is a very efficient method for the separation of these compounds, providing high efficiency and short analysis times. Different electrophoretic parameters were studied to optimize the separation, such as the buffer pH and concentration, sodium dodecyl sulphate (SDS) concentration, injection conditions and applied voltage. Excellent separation of the studied compounds was achieved within about 7 min. Soil samples were previously extracted using methanol in an ultrasonic bath and then a SPE procedure was applied to pre-concentrate the analytes by passage through a LiChrolut EN sorbent column. Detection limits at the low microgkg(-1) level were obtained. The proposed method has been satisfactorily applied in soil samples showing recoveries ranging from 86.7% to 104.2% and represents a valuable alternative to high-performance liquid chromatography (HPLC).
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Affiliation(s)
- José F Huertas-Pérez
- Department of Analytical Chemistry, Faculty of Sciences, University of Granada, E-18071 Granada, Spain
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47
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Cifuentes A. Recent advances in the application of capillary electromigration methods for food analysis. Electrophoresis 2006; 27:283-303. [PMID: 16307427 DOI: 10.1002/elps.200500474] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
This article reviews the latest developments in the application of capillary electromigration methods for the analysis of foods and food components. Nowadays, methods based on CE techniques are becoming widely used in food analytical and research laboratories. This review covers the application of CE to analyze amino acids, biogenic amines, peptides, proteins, DNAs, carbohydrates, phenols, polyphenols, pigments, toxins, pesticides, vitamins, additives, small organic and inorganic ions, chiral compounds, and other compounds in foods, as well as to investigate food interactions and food processing. The use of microchips as well as other foreseen trends in CE analysis of foods is discussed. Papers that were published during the period June 2002-June 2005 are included following the previous review by Frazier and Papadopoulou (Electrophoresis 2003, 24, 4095-4105).
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Affiliation(s)
- Alejandro Cifuentes
- Department of Food Analysis, Institute of Industrial Fermentations (CSIC), Madrid, Spain.
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48
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Orejuela E, Silva M. Rapid and sensitive determination of phosphorus-containing amino acid herbicides in soil samples by capillary zone electrophoresis with diode laser-induced fluorescence detection. Electrophoresis 2005; 26:4478-85. [PMID: 16259012 DOI: 10.1002/elps.200500290] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A straightforward and sensitive method has been developed for the analysis of phosphorus-containing amino acid herbicides (glufosinate and aminomethylphosphonic acid, the major metabolite of glyphosate) in soil samples. For this purpose, the analytical features of two indocyanine fluorescent dyes, sulfoindocyanine succinimidyl ester (Cy5) and 1-ethyl-1-[5-(N-succinimidyl-oxycarbonyl)pentyl]-3,3,3,3-tetramethyl-indodicarbocyanine chloride, as labeling reagents for the determination of these herbicides by CZE with diode LIF detection were investigated. Practical aspects related to the labeling chemistry and CZE separation showed that the two probes behave similarly, Cy5 being the best choice for the determination of these herbicides on account of its higher sensitivity. The optimum procedure includes a derivatization step of the pesticides at 25 degrees C for 30 min and direct injection to CZE analysis, which is conducted within about 14 min using ACN in the running buffer. The lowest detectable analyte concentration ranged from 0.025 to 0.18 microg/L with a precision of 3.6-5.4%. These results indicate that indocyanine fluorescence dyes are useful as rapid and sensitive labels for the determination of these herbicides when compared with typical fluorescein dyes such as FITC and 5-(4,6-dichloro-s-triazin-2-ylamino) fluorescein, because they provide faster labeling reactions even at room temperature and the excess of reagent practically does not interfere the determination. Finally, the Cy5 method was successfully applied to soil samples without a preliminary clean-up procedure, and the herbicides were measured without any interference from coexisting substances. The recoveries of these compounds in these samples at fortification levels of 100-500 ng/g were 90-93%.
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Affiliation(s)
- Eva Orejuela
- Department of Analytical Chemistry, Marie-Curie Building (Annex), Rabanales Campus, University of Cordoba, Cordoba, Spain
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Hernández-Borges J, García-Montelongo FJ, Cifuentes A, Rodríguez-Delgado MA. Analysis of triazolopyrimidine herbicides in soils using field-enhanced sample injection-coelectroosmotic capillary electrophoresis combined with solid-phase extraction. J Chromatogr A 2005; 1100:236-42. [PMID: 16212970 DOI: 10.1016/j.chroma.2005.09.053] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2005] [Revised: 09/15/2005] [Accepted: 09/22/2005] [Indexed: 11/22/2022]
Abstract
In this work, a combined methodology using off-line solid-phase extraction (SPE), on-line field-enhanced sample injection (FESI) and coelectroosmotic capillary electrophoresis with UV detection (CE-UV) is developed for the trace analysis of five triazolopyrimidine sulfonanilide pesticides (i.e., flumetsulam, florasulam, cloransulam-methyl, diclosulam and metosulam). An adequate background electrolyte (BGE) was obtained for the separation of these pesticides using hexadimethrine bromide (HDB) as electroosmotic flow (EOF) modifier. This BGE consisted of 0.00042% HDB, 11 mM formic acid, 16 mM ammonium carbonate and 2.5 mM alpha-CD solution at pH 7.6. The use of this running buffer together with the FESI preconcentration method provided limits of detection (LODs) in the low microg/L range (i.e., between 13.0 and 31.5 microg/L). The optimized FESI-CE-UV method was combined with off-line SPE using C(18) cartridges and applied to the determination of the selected group of pesticides in soil samples. Recovery percentages ranged between 50 and 84% in these samples with LODs between 18 and 34 microg/kg. This work shows the great possibilities of the combined use of SPE-FESI-CE-UV to improve CE sensitivity allowing the achievement of LODs similar to other analytical techniques as GC or HPLC.
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Affiliation(s)
- Javier Hernández-Borges
- Department of Analytical Chemistry, Nutrition and Food Science, University of La Laguna, Santa Cruz de Tenerife, Spain
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Hernández-Borges J, Rodríguez-Delgado MA, García-Montelongo FJ, Cifuentes A. Chiral analysis of pollutants and their metabolites by capillary electromigration methods. Electrophoresis 2005; 26:3799-813. [PMID: 16217833 DOI: 10.1002/elps.200500084] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Chiral separation of enantiomers is one of the most challenging tasks for any analytical technique including CE. Since the first report in 1985 showing the great possibilities of CE for the separation of chiral compounds, the amount of publications concerning this topic has quickly increased. Although chiral electromigration methods have mainly been used for enantioseparation of drugs and pharmaceuticals, they have also been applied to analyze chiral pollutants. This article intends to provide an updated overview, including works published till January 2005, on the principal applications of CE to the chiral analysis of pollutants and their metabolites, with special emphasis on articles published in the last 10 years. The main advantages and drawbacks regarding the use of CE for chiral separation of pollutants are addressed including some discussion on the foreseen trends of electromigration procedures applied to chiral analysis of contaminants.
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Affiliation(s)
- Javier Hernández-Borges
- Department of Analytical Chemistry, Nutrition and Food Science, University of La Laguna, La Laguna, Tenerife, Spain
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