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Smith KT, Ramsperger CA, Hunter KE, Zuehlsdorff TJ, Stylianou KC. Colorimetric detection of acidic pesticides in water. Chem Commun (Camb) 2021; 58:953-956. [PMID: 34940765 DOI: 10.1039/d1cc06213a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A water-stable, porphyrin-based metal-organic framework (MOF) produces a distinct colour change in response to acids' pKa and concentrations. This colour change is associated with the protonation of the N-atoms within the porphyrin ligand present in the MOF structure. As a proof-of-concept, we demonstrate the use of this MOF for detecting traces of different acidic pesticides present in water samples spontaneously.
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Affiliation(s)
- Kyle T Smith
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR, 97331-4003, USA.
| | - Chloe A Ramsperger
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR, 97331-4003, USA.
| | - Kye E Hunter
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR, 97331-4003, USA.
| | - Tim J Zuehlsdorff
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR, 97331-4003, USA.
| | - Kyriakos C Stylianou
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR, 97331-4003, USA.
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2
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Liberato PA, Okumura LL, Silva AFS, Gurgel A, Aleixo H, Silva JG, de Oliveira AF. Determination of quinclorac by adsorptive stripping voltammetry in rice samples without sample pretreatment. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2021; 56:828-837. [PMID: 34348078 DOI: 10.1080/03601234.2021.1959181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A novel voltammetric method with practically no sample pretreatment was developed for determination of Quinclorac (QNC) in rice samples by using a working Carbon Paste Electrode (CPE) modified with ionic liquid, with deposition potential (ED) of -1.43 V for 30 s in NaOH 0.01 mol L-1. The systematic influence of cations and anions of imidazole ionic liquids on the composition of CPE has evaluated. The best electrode composition was 65% (w/w) of graphite powder, 30% (w/w) of mineral oil and 5.0% (w/w) of C4min+BF4- ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate). The matrices analyzed were deionized water and extracts of upland rice: white, brown, peel and seed. The limits of quantification ranged between 0.954 mg kg-1 and 3.61 mg kg-1. The recovery percentages of QNC in rice samples ranged between 90% and 121%. The simplicity and good analytical frequency enable the proposed method to be used to obtain preliminary information on the presence of QNC, prior to the implementation of more detailed, costly and elaborate quantitative analyses. The technique can be applied in the study and evaluation of sorption mechanisms, metabolization of the herbicide in plants and its persistence and degradation in the environment.
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Affiliation(s)
- Priscila A Liberato
- Applied Electroanalytical Group, Department of Chemistry, Federal University of Viçosa, Viçosa, Brazil
| | - Leonardo L Okumura
- Applied Electroanalytical Group, Department of Chemistry, Federal University of Viçosa, Viçosa, Brazil
| | - Astréa F S Silva
- Applied Electroanalytical Group, Department of Chemistry, Federal University of Viçosa, Viçosa, Brazil
| | - Alexandre Gurgel
- Applied Electroanalytical Group, Department of Chemistry, Federal University of Viçosa, Viçosa, Brazil
| | - Herbert Aleixo
- Multidisciplinary Laboratory in Basic Sciences I, Federal University of the Valleys of Jequitinhonha and Mucuri, Unaí, Brazil
| | - Júnio G Silva
- Laboratory 220, Department of Chemistry, Federal University of Minas Gerais, Belo Horizonte, Brazil
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Yuan X, Yuan Y, Gao X, Xiong Z, Zhao L. Magnetic dummy-template molecularly imprinted polymers based on multi-walled carbon nanotubes for simultaneous selective extraction and analysis of phenoxy carboxylic acid herbicides in cereals. Food Chem 2020; 333:127540. [DOI: 10.1016/j.foodchem.2020.127540] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Revised: 06/21/2020] [Accepted: 07/07/2020] [Indexed: 01/17/2023]
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4
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Ghaste M, Hayden NC, Osterholt MJ, Young J, Young B, Widhalm JR. Evaluation of a Stable Isotope-Based Direct Quantification Method for Dicamba Analysis from Air and Water Using Single-Quadrupole LC-MS. Molecules 2020; 25:molecules25163649. [PMID: 32796576 PMCID: PMC7465465 DOI: 10.3390/molecules25163649] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/04/2020] [Accepted: 08/08/2020] [Indexed: 11/16/2022] Open
Abstract
Dicamba is a moderately volatile herbicide used for post-emergent control of broadleaf weeds in corn, soybean, and a number of other crops. With increased use of dicamba due to the release of dicamba-resistant cotton and soybean varieties, growing controversy over the effects of spray drift and volatilization on non-target crops has increased the need for quantifying dicamba collected from water and air sampling. Therefore, this study was designed to evaluate stable isotope-based direct quantification of dicamba from air and water samples using single-quadrupole liquid chromatography–mass spectrometry (LC–MS). The sample preparation protocols developed in this study utilize a simple solid-phase extraction (SPE) protocol for water samples and a single-step concentration protocol for air samples. The LC–MS detection method achieves sensitive detection of dicamba based on selected ion monitoring (SIM) of precursor and fragment ions and relies on the use of an isotopically labeled internal standard (IS) (D3-dicamba), which allows for calculating recoveries and quantification using a relative response factor (RRF). Analyte recoveries of 106–128% from water and 88–124% from air were attained, with limits of detection (LODs) of 0.1 ng mL−1 and 1 ng mL−1, respectively. The LC–MS detection method does not require sample pretreatment such as ion-pairing or derivatization to achieve sensitivity. Moreover, this study reveals matrix effects associated with sorbent resin used in air sample collection and demonstrates how the use of an isotopically labeled IS with RRF-based analysis can account for ion suppression. The LC–MS method is easily transferrable and offers a robust alternative to methods relying on more expensive tandem LC–MS/MS-based options.
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Affiliation(s)
- Manoj Ghaste
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA;
- Center for Plant Biology, Purdue University, West Lafayette, IN 47907, USA
| | - Nicholas C. Hayden
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, USA; (N.C.H.); (M.J.O.); (J.Y.); (B.Y.)
| | - Matthew J. Osterholt
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, USA; (N.C.H.); (M.J.O.); (J.Y.); (B.Y.)
| | - Julie Young
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, USA; (N.C.H.); (M.J.O.); (J.Y.); (B.Y.)
| | - Bryan Young
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, USA; (N.C.H.); (M.J.O.); (J.Y.); (B.Y.)
| | - Joshua R. Widhalm
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA;
- Center for Plant Biology, Purdue University, West Lafayette, IN 47907, USA
- Correspondence: ; Tel.: +1-765-496-3891
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de Barros ALC, de Abreu CG, da Cunha CCRF, da Silva Rodrigues DA, Afonso RJDCF, da Silva GA. Method development for simultaneous determination of polar and nonpolar pesticides in surface water by low-temperature partitioning extraction (LTPE) followed by HPLC-ESI-MS/MS. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:31609-31622. [PMID: 31482525 DOI: 10.1007/s11356-019-06286-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 08/22/2019] [Indexed: 06/10/2023]
Abstract
During this research, chemometric approaches were applied for optimization of the low-temperature partitioning extraction (LTPE) for the simultaneous analysis of the pesticides: acephate, difenoconazole, fenamidone, fluazifop, fluazinam, methamidophos, and thiamethoxam from surface water samples and determination by high-performance liquid chromatography-electrospray ionization-tandem mass spectrometry. It was used the 23 full factorial and the Doehlert experimental designs. The extraction technique was optimized by evaluating the effects of the three variables: sample pH, ionic strength (addition of Na2HPO4), and organic solvent volume. Considering the interest to find an optimal condition for all analytes simultaneously, the best extraction parameters found were as follows: pH = 5.33, concentration of Na2HPO4 = 0.0088 mol L-1 and organic phase volume = 4.5 mL. The optimized methodology showed LOD and LOQ levels from 0.33 to 8.13 ng L-1 and from 1.09 to 26.84 ng L-1, respectively. The recovery values ranged from 38.37 and 99.83% and the RSD values varied from 2.33 to 18.92%. The method was applied to surface water analysis sampled in areas with intensive agricultural practices in Ouro Branco City, Minas Gerais, Brazil. The difenoconazole was detected in concentrations between 12.53 and 94.76 ng L-1.
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Affiliation(s)
- André Luis Correa de Barros
- Postgraduation Program in Environmental Engineering (ProAmb), Federal University of Ouro Preto (UFOP), Ouro Preto, MG, 35400-000, Brazil
| | - Cíntia Grossi de Abreu
- Department of Chemistry, Federal University of Ouro Preto (UFOP), Ouro Preto, MG, 35400-000, Brazil
| | | | | | | | - Gilmare Antônia da Silva
- Department of Chemistry, Federal University of Ouro Preto (UFOP), Ouro Preto, MG, 35400-000, Brazil.
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Lv Y, Bai H, Yang J, He Y, Ma Q. Direct Mass Spectrometry Analysis Using In-Capillary Dicationic Ionic Liquid-Based in Situ Dispersive Liquid–Liquid Microextraction and Sonic-Spray Ionization. Anal Chem 2019; 91:6661-6668. [DOI: 10.1021/acs.analchem.9b00597] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Yueguang Lv
- Chinese Academy of Inspection and Quarantine, Beijing 100176, P. R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hua Bai
- Chinese Academy of Inspection and Quarantine, Beijing 100176, P. R. China
| | - Jingkui Yang
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yujian He
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Qiang Ma
- Chinese Academy of Inspection and Quarantine, Beijing 100176, P. R. China
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Pinto EC, Xu C, Cabral LM, Armstrong DW, de Sousa VP. Sensitive detection of topiramate degradation products by high-performance liquid chromatography/electrospray ionization mass spectrometry using ion-pairing reagents and polarity switching. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2019; 33:116-124. [PMID: 30378202 DOI: 10.1002/rcm.8321] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 10/22/2018] [Accepted: 10/23/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE The chromatographic analysis of topiramate and its degradation products is challenging due to the absence of chromophoric moieties in their structures, the wide polarity range of the compounds and their ionization differences. This work proposes two new mass spectrometry approaches for evaluating these analytes. METHODS Based on the calculated experimental limit of detection (LOD), a highly sensitive high-performance liquid chromatography (HPLC) paired-ion electrospray ionization mass spectrometry (PIESI-MS) method was developed for the determination of topiramate inorganic degradation products. The influence of different solvent systems on the LODs for topiramate and its main degradation products was determined in both positive/negative ionization modes. In addition, a HPLC method to analyze both organic and inorganic degradation products was proposed by mass spectrometry with positive/negative ion switching electrospray ionization. RESULTS A sensitive HPLC/PIESI-MS method was achieved for the efficient separation of topiramate inorganic degradation products. Both sulfate and sulfamate were detected in the positive selected ion monitoring (SIM) mode with an increased sensitivity compared with the negative SIM mode. The HPLC/ESI-MS analysis with positive/negative ion switching allowed the simultaneous separation and detection of the major degradation products of topiramate in a 10-min run using a single column and a single detector. CONCLUSIONS Two new alternative MS approaches for analyzing the main degradation products of topiramate were developed. The proposed methods are considered advantageous over the existing methods and can be applied to quality control studies of topiramate.
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Affiliation(s)
- Eduardo Costa Pinto
- Department of Pharmaceutics, Faculty of Pharmacy, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX, USA
| | - Chengdong Xu
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX, USA
| | - Lucio Mendes Cabral
- Department of Pharmaceutics, Faculty of Pharmacy, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Daniel W Armstrong
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX, USA
| | - Valéria Pereira de Sousa
- Department of Pharmaceutics, Faculty of Pharmacy, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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A highly sensitive and selective method for determination of phenoxy carboxylic acids from environmental water samples by dispersive solid-phase extraction coupled with ultra high performance liquid chromatography-tandem mass spectrometry. Talanta 2019; 191:313-323. [DOI: 10.1016/j.talanta.2018.08.055] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 08/16/2018] [Accepted: 08/20/2018] [Indexed: 11/23/2022]
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9
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Hellinghausen G, Readel ER, Wahab MF, Lee JT, Lopez DA, Weatherly CA, Armstrong DW. Mass Spectrometry-Compatible Enantiomeric Separations of 100 Pesticides Using Core–Shell Chiral Stationary Phases and Evaluation of Iterative Curve Fitting Models for Overlapping Peaks. Chromatographia 2018. [DOI: 10.1007/s10337-018-3604-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Valimaña-Traverso J, Morante-Zarcero S, Pérez-Quintanilla D, García MÁ, Sierra I, Marina ML. Cationic amine-bridged periodic mesoporous organosilica materials for off-line solid-phase extraction of phenoxy acid herbicides from water samples prior to their simultaneous enantiomeric determination by capillary electrophoresis. J Chromatogr A 2018; 1566:146-157. [DOI: 10.1016/j.chroma.2018.06.042] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 06/10/2018] [Accepted: 06/18/2018] [Indexed: 10/28/2022]
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11
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Lee JH, Kim SJ, Lee S, Rhee JK, Lee SY, Na YC. Saturated fatty acid determination method using paired ion electrospray ionization mass spectrometry coupled with capillary electrophoresis. Anal Chim Acta 2017; 984:223-231. [DOI: 10.1016/j.aca.2017.06.052] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 06/28/2017] [Accepted: 06/29/2017] [Indexed: 11/16/2022]
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12
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Pan N, Rao W, Standke SJ, Yang Z. Using Dicationic Ion-Pairing Compounds To Enhance the Single Cell Mass Spectrometry Analysis Using the Single-Probe: A Microscale Sampling and Ionization Device. Anal Chem 2016; 88:6812-9. [PMID: 27239862 DOI: 10.1021/acs.analchem.6b01284] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A unique mass spectrometry (MS) method has been developed to determine the negatively charged species in live single cells using the positive ionization mode. The method utilizes dicationic ion-pairing compounds through the miniaturized multifunctional device, the single-probe, for reactive MS analysis of live single cells under ambient conditions. In this study, two dicationic reagents, 1,5-pentanediyl-bis(1-butylpyrrolidinium) difluoride (C5(bpyr)2F2) and 1,3-propanediyl-bis(tripropylphosphonium) difluoride (C3(triprp)2F2), were added in the solvent and introduced into single cells to extract cellular contents for real-time MS analysis. The negatively charged (1- charged) cell metabolites, which form stable ion-pairs (1+ charged) with dicationic compounds (2+ charged), were detected in positive ionization mode with a greatly improved sensitivity. We have tentatively assigned 192 and 70 negatively charged common metabolites as adducts with (C5(bpyr)2F2) and (C3(triprp)2F2), respectively, in three separate SCMS experiments in the positive ion mode. The total number of tentatively assigned metabolites is 285 for C5(bpyr)2F2 and 143 for C3(triprp)2F2. In addition, the selectivity of dicationic compounds in the complex formation allows for the discrimination of overlapped ion peaks with low abundances. Tandem (MS/MS) analyses at the single cell level were conducted for selected adduct ions for molecular identification. The utilization of the dicationic compounds in the single-probe MS technique provides an effective approach to the detection of a broad range of metabolites at the single cell level.
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Affiliation(s)
- Ning Pan
- Department of Chemistry and Biochemistry, University of Oklahoma , Norman, Oklahoma 73019, United States
| | - Wei Rao
- Department of Chemistry and Biochemistry, University of Oklahoma , Norman, Oklahoma 73019, United States
| | - Shawna J Standke
- Department of Chemistry and Biochemistry, University of Oklahoma , Norman, Oklahoma 73019, United States
| | - Zhibo Yang
- Department of Chemistry and Biochemistry, University of Oklahoma , Norman, Oklahoma 73019, United States
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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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14
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Reduced matrix effects for anionic compounds with paired ion electrospray ionization mass spectrometry. Anal Chim Acta 2016; 912:74-84. [DOI: 10.1016/j.aca.2016.01.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 01/06/2016] [Accepted: 01/17/2016] [Indexed: 11/18/2022]
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15
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Rao W, Pan N, Tian X, Yang Z. High-Resolution Ambient MS Imaging of Negative Ions in Positive Ion Mode: Using Dicationic Reagents with the Single-Probe. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:124-134. [PMID: 26489411 PMCID: PMC4924531 DOI: 10.1007/s13361-015-1287-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 09/28/2015] [Accepted: 09/30/2015] [Indexed: 05/30/2023]
Abstract
We have used the Single-probe, a miniaturized sampling device utilizing in-situ surface microextraction for ambient mass spectrometry (MS) analysis, for the high resolution MS imaging (MSI) of negatively charged species in the positive ionization mode. Two dicationic compounds, 1,5-pentanediyl-bis(1-butylpyrrolidinium) difluoride [C5(bpyr)2F2] and 1,3-propanediyl-bis(tripropylphosphonium) difluoride [C3(triprp)2F2], were added into the sampling solvent to form 1+ charged adducts with the negatively charged species extracted from tissues. We were able to detect 526 and 322 negatively charged species this way using [C5(bpyr)2F2] and [C3(triprp)2F2], respectively, including oleic acid, arachidonic acid, and several species of phosphatidic acid, phosphoethanolamine, phosphatidylserine, phosphatidylglycerol, phosphatidylinositol, and others. In conjunction with the identification of the non-adduct cations, we have tentatively identified a total number of 1200 and 828 metabolites from mouse brain sections using [C5(bpyr)2F2] and [C3(triprp)2F2], respectively, through high mass accuracy measurements (mass error <5 ppm); MS/MS analyses were also performed to verify the identity of selected species. In addition to the high mass accuracy measurement, we were able to generate high spatial resolution (~17 μm) MS images of mouse brain sections. Our study demonstrated that utilization of dicationic compounds in the surface microextraction with the Single-probe device can perform high mass and spatial resolution ambient MSI measurements of broader types of compounds in tissues. Other reagents can be potentially used with the Single-probe device for a variety of reactive MSI studies to enable the analysis of species that are previously intractable.
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16
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Guo H, Riter LS, Wujcik CE, Armstrong DW. Quantitative analysis of dicamba residues in raw agricultural commodities with the use of ion-pairing reagents in LC-ESI-MS/MS. Talanta 2015; 149:103-109. [PMID: 26717820 DOI: 10.1016/j.talanta.2015.11.043] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 11/16/2015] [Accepted: 11/17/2015] [Indexed: 12/11/2022]
Abstract
A sensitive and selective HPLC-MS/MS method was developed for the quantitative analysis of dicamba residues in raw agricultural commodities (RACs). Instead of analysis in the traditionally used negative electrospray ionization (ESI) mode, these anionic compounds were detected in positive ESI with the use of ion-pairing reagents. In this approach, only a small amount (60µM) of a commercially available dicationic ion-pairing reagent was introduced into the post-column sample stream. This method has been validated in six different types of RACs including corn grain, corn stover, cotton seed, soybean, soy forage and orange with satisfactory quantitative accuracy and precision. The limits of quantitation (LOQ) values for these analytes were 1.0 to 3.0µg/kg. The standard curves were linear over the range of the tested concentrations (3.0 to 500µg/kg), with correlation coefficient (r) values≥0.999. Evaluation of ionization effects in RAC matrix extracts using diluent blanks for comparison showed no significant matrix effects were present.
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Affiliation(s)
- Hongyue Guo
- Monsanto Company, St Louis, MO, United States; University of Texas at Arlington, Arlington, TX, United States
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17
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Hong SH, Lee JB, Lee SH, Cho YH, Shin HS. Simultaneous Determination of Ultra-Trace Pesticides and Synthetic Materials in Surface Water by LC-ESI-MS/MS. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2015. [DOI: 10.5012/jkcs.2015.59.3.225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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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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19
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Lostun D, Perez CJ, Licence P, Barrett DA, Ifa DR. Reactive DESI-MS imaging of biological tissues with dicationic ion-pairing compounds. Anal Chem 2015; 87:3286-93. [PMID: 25710577 DOI: 10.1021/ac5042445] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
This work illustrates reactive desorption electrospray ionization mass spectrometry (DESI-MS) with a stable dication on biological tissues. Rat brain and zebra fish tissues were investigated with reactive DESI-MS in which the dictation forms a stable bond with biological tissue fatty acids and lipids. Tandem mass spectrometry (MS/MS) was used to characterize the dication (DC9) and to identify linked lipid-dication compounds formed. The fragment m/z 85 common to both DC9 fragmentation and DC9-lipid fragmentation was used to confirm that DC9 is indeed bonded with the lipids. Lipid signals in the range of m/z 250-350 and phosphoethanolamines (PE) m/z 700-800 observed in negative ion mode were also detected in positive ion mode with reactive DESI-MS with enhanced signal intensity. Reactive DESI-MS imaging in positive ion mode of rat brain and zebra fish tissues allowed enhanced detection of compounds commonly observed in the negative ion mode.
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Affiliation(s)
- Dragos Lostun
- †Department of Chemistry, Centre for Research in Mass Spectrometry, York University, Toronto, Ontario M3J 1P3, Canada
| | - Consuelo J Perez
- †Department of Chemistry, Centre for Research in Mass Spectrometry, York University, Toronto, Ontario M3J 1P3, Canada
| | - Peter Licence
- ‡School of Chemistry, University of Nottingham, Nottingham NG7 2RD, U.K
| | - David A Barrett
- §Centre for Analytical Bioscience, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, U.K
| | - Demian R Ifa
- †Department of Chemistry, Centre for Research in Mass Spectrometry, York University, Toronto, Ontario M3J 1P3, Canada
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20
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Wang L, Cai J, Wang Y, Fang Q, Wang S, Cheng Q, Du D, Lin Y, Liu F. A bare-eye-based lateral flow immunoassay based on the use of gold nanoparticles for simultaneous detection of three pesticides. Mikrochim Acta 2014. [DOI: 10.1007/s00604-014-1247-0] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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21
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Rao W, Mitchell D, Licence P, Barrett DA. The use of dicationic ion-pairing compounds to enhance the ambient detection of surface lipids in positive ionization mode using desorption electrospray ionisation mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2014; 28:616-624. [PMID: 24519824 DOI: 10.1002/rcm.6826] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 01/02/2014] [Accepted: 01/04/2014] [Indexed: 06/03/2023]
Abstract
RATIONALE Lipids are typically analysed in negative ionisation mode in desorption electrospray ionisation mass spectrometry (DESI-MS), which can result in reduced sensitivity. In this study we examine the use of dicationic compounds as reactive DESI-MS agents to detect a range of lipid standards from the surface in positive ionisation mode. METHODS Nine dicationic compounds were tested for their ability to detect seven representative lipid species (palmitoleic acid, linoleic acid, phosphatidic acid (34:1), phosphoethanolamine (34:2), phosphatidylglycerol (34:1), phosphatidylserine (36:1), and phosphoinositol (34:2)) with a 2D DESI source on hydrophobic surfaces. Two different solvent systems (methanol/chloroform (1:1) and methanol) were tested with each dicationic compound, with the DESI-MS analysis performed in the positive ionisation mode. RESULTS Most of the dications tested were able to form stable ion-pairs with the negatively charged lipid species when analysed from the surface with DESI-MS, and were detected readily in positive ionisation electrospray mode as singly charged species. The optimal solvent system was found to be methanol. The dicationic compound [C6(C1Pyrr)2][Br]2 was found to enhance the detection of palmitoleic acid (638%), linoleic acid (304%) and phosphoethanolamine (269%) compared with the negative ionisation mode. CONCLUSIONS We demonstrate the first successful application of dicationic compounds in DESI-MS for the ambient surface detection of model lipids in positive electrospray ionisation mode. Dicationic compounds could potentially be used as reactive DESI-MS agents to improve the ambient detection of a number of negatively charged analytes.
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Affiliation(s)
- Wei Rao
- Centre for Analytical Bioscience, School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK
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22
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Xu C, Guo H, Breitbach ZS, Armstrong DW. Mechanism and Sensitivity of Anion Detection Using Rationally Designed Unsymmetrical Dications in Paired Ion Electrospray Ionization Mass Spectrometry. Anal Chem 2014; 86:2665-72. [DOI: 10.1021/ac404005v] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chengdong Xu
- Department of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Hongyue Guo
- Department of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Zachary S. Breitbach
- Department of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Daniel W. Armstrong
- Department of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
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23
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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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