1
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Wang X, Liu J, Zhang K, Yao X, Zhang S. Analysis of mycotoxins in grain samples using 3D covalent organic frameworks and stable isotope labeling technique. J LIQ CHROMATOGR R T 2022. [DOI: 10.1080/10826076.2022.2066689] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Xueting Wang
- Shandong Province Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, China
| | - Juping Liu
- Shandong Province Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, China
| | - Kaiyue Zhang
- Shandong Province Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, China
| | - Xin Yao
- Shandong Province Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, China
| | - Shijuan Zhang
- Shandong Province Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, China
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2
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Miah S, Fukiage S, Begum ZA, Murakami T, Mashio AS, Rahman IMM, Hasegawa H. A technique for the speciation analysis of metal-chelator complexes in aqueous matrices using ultra-performance liquid chromatography-quadrupole/time-of-flight mass spectrometry. J Chromatogr A 2020; 1630:461528. [PMID: 32950813 DOI: 10.1016/j.chroma.2020.461528] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 09/02/2020] [Accepted: 09/04/2020] [Indexed: 10/23/2022]
Abstract
Chelators, capable of creating soluble complexes with metals, may disrupt the natural speciation of metals in environmental matrices. Detection of environmental speciation of such complexes has remained challenging as obtaining the precise inherent nature of metal-chelator complexes is difficult by using routine techniques. Herein, we report a rapid and sensitive technique for the speciation analysis of complexes of five metal ions (Ni, Pb, Co, Fe and Ca) with two aminopolycarboxylate chelator variants, namely, EDTA (ethylenediaminetetraacetic acid) and EDDS (ethylenediamine-N,N'-disuccinic acid), including the simultaneous quantification of those complexes. EDTA is characterized as environmentally persistent among the chelators used in the current work whereas EDDS is biodegradable. The speciation analysis was performed using ultra-performance liquid chromatography-quadrupole/time-of-flight mass spectrometry (UPLC-Q-TOF-MS). The separation was achieved by using hydrophilic interaction liquid chromatographic column. The effect of various operating parameters on analytes such as mobile-phase composition, buffer concentrations and pH, sample diluents, sample injection volume, and column temperature on the peak shape and sensitivity were systematically optimized. The dilution was the only requirement for preparing the samples for analysis. The average relative uncertainty was 2.4% with the average precision (as RSD, n= 7) of 3.5%. For the metal-EDTA complexes, LOD range was 3 to 76 nmol L-1 with satisfactory recovery from a simulated mix matrix (recovery: 79-97%) and river water by standard addition (recovery: 82-94%). For metal-EDDS complexes, LOD range was 66 to 293 nmol L-1 with recovery from a simulated mix matrix (recovery: 56-97%) and river water by standard addition (recovery: 61-91%). The proposed method will be applicable in speciation analysis and simultaneous detection of metal-chelator complexes from environmental samples.
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Affiliation(s)
- Sohag Miah
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan; Institute of Forestry and Environmental Sciences, University of Chittagong, Chattogram 4331, Bangladesh.
| | - Shohei Fukiage
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Zinnat A Begum
- Venture Business Laboratory, Organization of Frontier Science and Innovation, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Takaya Murakami
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan; Forensic Science Laboratory, Ishikawa Prefectural Police Headquarters, Kanazawa, Japan
| | - Asami S Mashio
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Ismail M M Rahman
- Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima City, Fukushima 960-1296, Japan.
| | - Hiroshi Hasegawa
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
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Giannoukos S, Lee CP, Tarik M, Ludwig C, Biollaz S, Lamkaddam H, Baltensperger U, Henry Prevot AS, Slowik J. Real-Time Detection of Aerosol Metals Using Online Extractive Electrospray Ionization Mass Spectrometry. Anal Chem 2019; 92:1316-1325. [PMID: 31825206 DOI: 10.1021/acs.analchem.9b04480] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Metal emissions are of major environmental and practical concern because of their highly toxic effects on human health and ecosystems. Current technologies available in the market for their detection are typically limited by a time resolution of 1 h or longer (e.g., via semicontinuous X-ray fluorescence measurements) or are nonquantitative (e.g., laser ablation mass spectrometry). In this work, we report the development of a novel technique for the real-time detection and monitoring of metal particles in situ using an extractive electrospray ionization (EESI) source coupled to a high-resolution time-of-flight mass spectrometer (TOF-MS). The experiments were conducted in negative ionization mode using disodium ethylenediamine tetraacetic acid (EDTA) dihydrate to chelate with metals and form stable metal complexes. Results for water-soluble metal compounds were obtained. The following representative metal ions were examined: Pb, Cd, Zn, Ce (III), Ba, Ni, Fe(II), Fe(III), Cu(II), Cr, Mo, Co(II), Mg, Nd, Li, Ti, Ca, Cs, Ag, Tm, Er(III), La(III), Yb(III), Eu(III), Pr(III), Gd(III), Lu(III), Dy(III), Tb(III), Ho, and Ru(III). The results showed a very good linear mass response (R2 = 0.9983), low ng/m3 limits of detection (LoD), and a fast response time (1 s). The stability and repeatability of the developed EESI-TOF-MS were tested under complex dynamic and periodic experimental conditions, and negligible matrix effects were measured for internally and externally mixed metal particles. Benchmark testing against inductively coupled plasma-mass spectrometry (ICP-MS) was also performed, highlighting the online measurement capabilities of aerosol metals with a LoD lower than those of ICP-MS. Proof-of-concept ambient measurements were performed in New Delhi, India, and very promising results were obtained, allowing further exploitation elsewhere.
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Affiliation(s)
| | | | | | - Christian Ludwig
- Engineering (ENAC) , École Polytechnique Fédérale de Lausanne (EPFL) , CH 1015 Lausanne , Switzerland
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Miah S, Rahman IMM, Takemura M, Fukiage S, Mashio AS, Maki T, Hasegawa H. Determination of multiple chelator complexes in aqueous matrices using ultra-performance liquid chromatography-quadrupole/time-of-flight mass spectrometry. Talanta 2019; 194:980-990. [PMID: 30609633 DOI: 10.1016/j.talanta.2018.10.085] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 10/25/2018] [Accepted: 10/26/2018] [Indexed: 11/30/2022]
Abstract
The determination of aminopolycarboxylate chelators in environmental samples has remained an analytical challenge due to the structural similarities of these species and their minute concentrations in such matrices. Herein, we report a fast and sensitive technique for the determination of multiple chelator complexes in an aqueous matrix using ultra-performance liquid chromatography-quadrupole/time-of-flight mass spectrometry (UPLC-Q-TOF-MS). Eight chelators, including non-biodegradable (EDTA, EDTAOH, GEDTA, DPTAOH and DTPA) and biodegradable (EDDS, GLDA, and MGDA) variants were examined after complexation with CuII. The detection of these species using reverse-phase chromatography was compared with that achieved with hydrophilic interaction chromatography based on the corresponding peak resolution and retention time. The effect of varying the composition and pH of the mobile phase on the corresponding peak profiles and intensities for the chelator complexes was also evaluated. The CuII-derivatives of the chelators were individually detected under the optimized operating conditions. Relative to high-performance liquid chromatography equipped with a photodiode array detector, the developed UPLC-Q-TOF-MS technique provides rapid determination of chelator complexes in aqueous matrices with high sensitivity and superior peak resolution. The limit of detection ranged from 1.7-36 nmol L-1, and the limit of quantification ranged from 5.7-120 nmol L-1 for the eight chelator complexes in solution. The coefficients of determination (R2) were 0.962-0.999 for the chelators with an average relative uncertainty of 2.2%. The method was validated using a simulated mixed matrix and river water by standard addition (recovery: 83-100%).
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Affiliation(s)
- Sohag Miah
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
| | - Ismail M M Rahman
- Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima City, Fukushima 960-1296, Japan.
| | - Masashi Takemura
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Shohei Fukiage
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Asami S Mashio
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Teruya Maki
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Hiroshi Hasegawa
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
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5
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Zembrzuska J, Karbowska B. Identification of complexes involving thallium(I) and thallium(III) with EDTA and DTPA ligands by electrospray ionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2017; 31:1785-1792. [PMID: 28833820 DOI: 10.1002/rcm.7962] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 08/09/2017] [Accepted: 08/13/2017] [Indexed: 06/07/2023]
Abstract
RATIONALE Thallium is considered to be an environmental threat; however, its hazardous properties depend on its oxidation state. Tl(III) is approx. 1000-times more toxic compared with Tl(I), therefore identification of each species is essential in order to properly evaluate the associated health hazard. Electrospray ionization mass spectrometry (ESI-MS) allows determination of speciation in solution due to its soft mode of ionization while selective complexation with ligands can distinguish the Tl species. Selective complexation of Tl(I) and Tl(III) ions requires the use of two selective complexing agents and selection of appropriate conditions for this process. METHODS Tl(I) and Tl(III) ions as well as two ligands (EDTA and DTPA) were used to form binary (single ion + single ligand), ternary (one ion + both ligands) and quaternary systems (both ions and both ligands) under different pH conditions (7 and 8). These mixtures were subjected to the determination of Tl species using ESI-MS operating in positive and negative ion mode. RESULTS Tl(I) complexes with DTPA were identified at pH 7 and 8, whereas, in the case of EDTA, the complexes were detected only at pH 8. In contrast, Tl(III) formed distinct complexes with EDTA at pH 7 and 8, while with DTPA the complexes were detected only at pH 8. Analysis of the quaternary system (which contained both ions and both ligands) revealed that Tl(I) formed complexes with EDTA, while Tl(III) formed complexes with DTPA at pH 7 and 8. CONCLUSIONS The obtained results confirmed that the increase in the solution complexity allowed simultaneous identification of different complexes in solutions containing both Tl species. The initial analyses carried out for binary and ternary solutions facilitated the simultaneous determination of specific complexes (Tl(I) with EDTA and Tl(III) with DTPA) in the quaternary system.
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Affiliation(s)
- Joanna Zembrzuska
- Poznan University of Technology, Institute of Chemistry and Technical Electrochemistry, pl. Sklodowskiej-Curie 5, 60-965,, Poznan, Poland
| | - Bozena Karbowska
- Poznan University of Technology, Institute of Chemistry and Technical Electrochemistry, pl. Sklodowskiej-Curie 5, 60-965,, Poznan, Poland
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6
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Tata A, Eberlin MN. Catiomers and aniomers: unique classes of isomeric ions. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:1249-1252. [PMID: 28328024 DOI: 10.1002/rcm.7548] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 02/25/2016] [Accepted: 02/28/2016] [Indexed: 06/06/2023]
Affiliation(s)
- Alessandra Tata
- University of Campinas, Institute of Chemistry, UNICAMP-IQ, Campinas, SP, 13083-970, Brazil
| | - Marcos N Eberlin
- University of Campinas, Institute of Chemistry, UNICAMP-IQ, Campinas, SP, 13083-970, Brazil
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7
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Breitbach ZS, Berthod A, Huang K, Armstrong DW. Mass spectrometric detection of trace anions: The evolution of paired-ion electrospray ionization (PIESI). MASS SPECTROMETRY REVIEWS 2016; 35:201-218. [PMID: 25648413 DOI: 10.1002/mas.21448] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 05/04/2014] [Accepted: 05/04/2014] [Indexed: 06/04/2023]
Abstract
The negative-ion mode of electrospray ionization mass spectrometry (ESI-MS) is intrinsically less sensitive than the positive-ion mode. The detection and quantitation of anions can be performed in positive-ion mode by forming specific ion-pairs during the electrospray process. The paired-ion electrospray ionization (PIESI) method uses specially synthesized multifunctional cations to form positively charged adducts with the anions to be analyzed. The adducts are detected in the positive-ion mode and at higher m/z ratios to produce excellent signal-to-noise ratios and limits of detection that often are orders of magnitude better than those obtained with native anions in the negative-ion mode. This review briefly summarizes the different analytical approaches to detect and separate anions. It focuses on the recently introduced PIESI method to present the most effective dicationic, tricationic, and tetracationic reagents for the detection of singly and multiply charged anions and some zwitterions. The mechanism by which specific structural molecular architectures can have profound effects on signal intensities is also addressed.
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Affiliation(s)
- Zachary S Breitbach
- Department of Chemistry, University of Texas at Arlington, Planetarium Place, Arlington, 76019, Texas
| | - Alain Berthod
- Institute of Analytical Sciences, University of Lyon, 5 rue de la Doua, Villeurbanne, 69100, France
| | - Ke Huang
- Department of Chemistry, University of Texas at Arlington, Planetarium Place, Arlington, 76019, Texas
| | - Daniel W Armstrong
- Department of Chemistry, University of Texas at Arlington, Planetarium Place, Arlington, 76019, Texas
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8
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Kojima H, Kurihara S, Watanabe Y, Iwamaru K, Sato K, Tsunoda K, Hotta H. A novel method for determination of inorganic oxyanions by electrospray ionization mass spectrometry using dehydration reactions. JOURNAL OF MASS SPECTROMETRY : JMS 2016; 51:123-131. [PMID: 26889928 PMCID: PMC7166498 DOI: 10.1002/jms.3731] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 10/20/2015] [Accepted: 10/30/2015] [Indexed: 06/05/2023]
Abstract
Novel methods for the determination of inorganic oxyanions by electrospray (ES) ionization mass spectrometry have been developed using dehydration reactions between oxyanions and carboxylic acids at the ES interface. Twelve oxyanions (VO3 (-) , CrO4 (2-) , MoO4 (2-) , WO4 (2-) , BO3 (3-) , SiO3 (2-) , SiO4 (4-) , AsO4 (4-) , AsO2 (-) , SeO4 (2-) , SeO3 (2-) and NO2 (-) ), out of 16 tested, reacted with at least one of four aminopolycarboxylic acids, i.e. iminodiacetic acid (IDA), nitrilotriacetic acid (NTA), trans-1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid and triethylenetetramine-N,N,N',N″,N'″,N'″-hexaacetic acid, at the ES interface to produce the dehydration products that gave intense mass ion responses, sufficient for trace analysis. As examples, trace determinations of Cr(VI) and silica in water samples were achieved after online ion exchange chromatography, where the dehydration product of CrO4 (2-) and NTA (m/z 290) and that of SiO4 (4-) and IDA (m/z 192) were measured. The limits of detection of the respective methods were 17 nM (0.83 ng Cr/ml) for Cr(VI) and 0.17 μM (4.8 ng Si/mL) for SiO4 (4-) .
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Affiliation(s)
- Hirochika Kojima
- Department of Chemistry and Chemical BiologyGunma UniversityTenjin‐choKiryu376‐8515Japan
| | - Shota Kurihara
- Department of Chemistry and Chemical BiologyGunma UniversityTenjin‐choKiryu376‐8515Japan
- Nippon Steel & Sumikin Eco‐Tech CorporationKisarazu292‐0825Japan
| | - Yoshito Watanabe
- Department of Chemistry and Chemical BiologyGunma UniversityTenjin‐choKiryu376‐8515Japan
- Moriroku Technology Co., Ltd.Meiwa370‐0718Japan
| | - Koki Iwamaru
- Department of Chemistry and Chemical BiologyGunma UniversityTenjin‐choKiryu376‐8515Japan
| | - Kiichi Sato
- Department of Chemistry and Chemical BiologyGunma UniversityTenjin‐choKiryu376‐8515Japan
| | - Kin‐ichi Tsunoda
- Department of Chemistry and Chemical BiologyGunma UniversityTenjin‐choKiryu376‐8515Japan
| | - Hiroki Hotta
- Department of ChemistryNara University of EducationTakabatakeNara630‐8528Japan
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9
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Santos IC, Guo H, Mesquita RBR, Rangel AOSS, Armstrong DW, Schug KA. Paired-ion electrospray ionization--triple quadrupole tandem mass spectrometry for quantification of anionic surfactants in waters. Talanta 2015; 143:320-327. [PMID: 26078166 DOI: 10.1016/j.talanta.2015.04.081] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Revised: 04/24/2015] [Accepted: 04/27/2015] [Indexed: 11/26/2022]
Abstract
A new paired ion electrospray ionization tandem mass spectrometry method for determination of anionic surfactants in water samples was developed. In this method, dicationic ion-pairing reagents were complexed with monoanionic analytes to facilitate analyte detection in positive mode electrospray ionization - mass spectrometry. Single ion monitoring and selected reaction monitoring on a triple quadrupole instrument were performed and compared. Four dicationic reagents were tested for the determination of perfluorooctanoic acid (PFOA), perfluorooctane sulfonate (PFOS), sodium dodecyl sulfate (SDS), dodecylbenzene sulfonic acid (DBS), and stearic acid (SA), among other common anions. The obtained limits of detection were compared with those from previous literature. Solid phase extraction using a C18 cartridge was performed in order to eliminate matrix interferences. A literature review was compiled for the methods published between 2010 and 2015 for determination of anionic surfactants. The optimized method was more sensitive than previously developed methods with LOD values of 2.35, 35.4, 37.0, 1.68, and 0.675 pg for SDS, SA, DBS, PFOS, and PFOA, respectively. The developed method was effectively applied for the determination of anionic surfactants in different water samples such as bottled drinking water, cooking water, tap water, and wastewater.
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Affiliation(s)
- Inês C Santos
- CBQF - Centro de Biotecnologia e Química Fina, Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa/Porto, Rua Arquiteto Lobão Vital, Apartado 2511, 4202-401 Porto, Portugal; Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA
| | - Hongyue Guo
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA
| | - Raquel B R Mesquita
- CBQF - Centro de Biotecnologia e Química Fina, Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa/Porto, Rua Arquiteto Lobão Vital, Apartado 2511, 4202-401 Porto, Portugal
| | - António O S S Rangel
- CBQF - Centro de Biotecnologia e Química Fina, Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa/Porto, Rua Arquiteto Lobão Vital, Apartado 2511, 4202-401 Porto, Portugal
| | - Daniel W Armstrong
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA
| | - Kevin A Schug
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA.
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10
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Organic solvent and temperature-enhanced ion chromatography-high resolution mass spectrometry for the determination of low molecular weight organic and inorganic anions. Anal Chim Acta 2015; 865:83-91. [DOI: 10.1016/j.aca.2015.01.031] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 01/08/2015] [Accepted: 01/17/2015] [Indexed: 11/21/2022]
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11
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Ion chromatography-mass spectrometry: A review of recent technologies and applications in forensic and environmental explosives analysis. Anal Chim Acta 2014; 806:27-54. [DOI: 10.1016/j.aca.2013.10.047] [Citation(s) in RCA: 108] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 10/21/2013] [Accepted: 10/27/2013] [Indexed: 11/18/2022]
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12
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Xu C, Pinto EC, Armstrong DW. Separation and sensitive determination of sphingolipids at low femtomole level by using HPLC-PIESI-MS/MS. Analyst 2014; 139:4169-75. [DOI: 10.1039/c4an00775a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly sensitive paired ion electrospray ionization mass spectrometry (PIESI-MS) approach was developed for the trace determination of sphingolipids.
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Affiliation(s)
- Chengdong Xu
- Department of Chemistry and Biochemistry
- University of Texas at Arlington
- Arlington, USA
| | - Eduardo Costa Pinto
- Department of Pharmaceutics
- Faculty of Pharmacy
- Federal University of Rio de Janeiro
- Rio de Janeiro, Brazil
| | - Daniel W. Armstrong
- Department of Chemistry and Biochemistry
- University of Texas at Arlington
- Arlington, USA
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13
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Xu C, Armstrong DW. High-performance liquid chromatography with paired ion electrospray ionization (PIESI) tandem mass spectrometry for the highly sensitive determination of acidic pesticides in water. Anal Chim Acta 2013; 792:1-9. [PMID: 23910961 DOI: 10.1016/j.aca.2013.05.054] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 05/28/2013] [Accepted: 05/31/2013] [Indexed: 10/26/2022]
Abstract
A novel method based on the paired ion electrospray ionization (PIESI) mass spectrometry has been developed for determination of acidic pesticides at ultratrace levels in surface and ground waters. The proposed approach provides greatly enhanced sensitivity for acidic pesticides and overcomes the drawbacks of the less sensitive negative ion mode ESI-MS. The limits of detection (LODs) of 19 acidic pesticides were evaluated with four types of dicationic ion-pairing reagent (IPR) in both single ion monitoring (SIM) and selected reaction monitoring (SRM) mode. The LOD of 19 pesticides obtained with the use the optimal dicationic ion-pairing reagent ranged from 0.6pg to 19pg, indicating the superior sensitivity provided by this method. The transition pathways for different pesticide-IPR complexes during the collision induced dissociation (CID) were identified. To evaluate and eliminate any matrix effects and further decrease the detection limits, off-line solid-phase extraction (SPE) was performed for DI water and a river water matrix spiked with 2000ng L(-1) and 20ng L(-1) pesticides standards respectively, which showed an average percent recovery of 93%. The chromatographic separation of the acidic pesticides was conducted by high-performance liquid chromatography (HPLC) using a C18 column (250mm×2.1mm) in the reversed phase mode using linear gradient elution. The optimized HPLC-PIESI-MS/MS method was utilized for determination of acidic pesticide at ng L(-1) level in stream/pond water samples. This experimental approach is 1-3 orders of magnitude more sensitive for these analytes than other reported methods performed in the negative ion mode.
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Affiliation(s)
- Chengdong Xu
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX 76019, USA
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