1
|
Oschwald J, Reger D, Frühwald S, Warmbrunn V, Görling A, Jux N, Drewello T. Experimental and Theoretical Structure Elucidation of the [2 : 1] Complex Ion of Carbo[n]helicene with n=6, 7 and 8 and Ag . Chemphyschem 2023; 24:e202300496. [PMID: 37578805 DOI: 10.1002/cphc.202300496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 08/12/2023] [Accepted: 08/14/2023] [Indexed: 08/15/2023]
Abstract
Gas-phase complexes of [n]helicenes with n=6, 7 and 8 and the silver(I) cation are generated utilizing electrospray ionization mass spectrometry (ESI-MS). Besides the well-established [1 : 1] helicene/Ag+ -complex in which the helicene provides a tweezer-like surrounding for the Ag+ , there is also a [2 : 1] complex formed. Density functional theory (DFT) calculations in conjunction with energy-resolved collision-induced dissociation (ER-CID) experiments reveal that the second helicene attaches via π-π stacking to the first helicene, which is part of the pre-formed [1 : 1] tweezer complex with Ag+ . For polycyclic aromatic hydrocarbons (PAHs) of planar structure, the [2 : 1] complex with silver(I) is typically structured as an Ag+ -bound dimer in which the Ag+ would bind to both PAHs as the central metal ion (PAH-Ag+ -PAH). For helicenes, the Ag+ -bound dimer is of similar thermochemical stability as the π-π stacked dimer, however, it is kinetically inaccessible. Coronene (Cor) is investigated in comparison to the helicenes as an essentially planar PAH. In analogy to the π-π stacked dimer of the helicenes, the Cor-Ag+ -Cor-Cor complex is also observed. Competition experiments using [n]helicene mixtures reveal that the tweezer complexes of Ag+ are preferably formed with the larger helicenes, with n=6 being entirely ignored as the host for Ag+ in the presence of n=7 or 8.
Collapse
Affiliation(s)
- Johannes Oschwald
- Physical Chemistry I, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058, Erlangen, Germany
| | - David Reger
- Organic Chemistry II, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany
- Current affiliation: Department of Chemistry, Imperial College London, Molecular Science Research Hub, White City Campus, 82 Wood Lane, London, W12 0BZ, United Kingdom
| | - Stefan Frühwald
- Theoretical Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058, Erlangen, Germany
| | - Vera Warmbrunn
- Physical Chemistry I, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058, Erlangen, Germany
| | - Andreas Görling
- Theoretical Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058, Erlangen, Germany
| | - Norbert Jux
- Organic Chemistry II, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany
| | - Thomas Drewello
- Physical Chemistry I, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058, Erlangen, Germany
| |
Collapse
|
2
|
María Casas-Ferreira A, del Nogal Sánchez M, Rodríguez-Gonzalo E, Pérez Pavón JL. Non-separative determination of isomeric polycyclic aromatic hydrocarbons by electrospray Ag(I) cationization mass spectrometry and multivariate calibration. Microchem J 2022. [DOI: 10.1016/j.microc.2022.108072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
3
|
Schneider E, Giocastro B, Rüger CP, Adam TW, Zimmermann R. Detection of Polycyclic Aromatic Hydrocarbons in High Organic Carbon Ultrafine Particle Extracts by Electrospray Ionization Ultrahigh-Resolution Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2022; 33:2019-2023. [PMID: 36194839 DOI: 10.1021/jasms.2c00163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The detection of polycyclic aromatic hydrocarbons (PAHs) by electrospray ionization (ESI) without additional reagents or targeted setup changes to the ionization source was observed in ultrafine particle (UFP) extracts, with high organic carbon (OC) concentrations, generated by a combustion aerosol standard (CAST) soot generator. Particulate matter (PM) was collected on filters, extracted with methanol, and analyzed by ESI Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Next to oxygen-containing species, pure hydrocarbons were found to be one of the most abundant compound classes, detected as [M + Na]+ or [M + H]+ in ESI+ and mostly as [M - H]- in ESI-. The assigned hydrocarbon elemental compositions are identified as PAHs due to their high aromaticity index (AI > 0.67) and were additionally confirmed by MS/MS experiments as well as laser desorption ionization (LDI). Thus, despite the relatively low polarity, PAHs have to be considered in the molecular attribution of these model aerosols and/or fresh emissions with low salt content investigated by ESI.
Collapse
Affiliation(s)
- Eric Schneider
- Joint Mass Spectrometry Centre (JMSC), Chair of Analytical Chemistry, University Rostock, 18059Rostock, Germany
- Department Life, Light & Matter (LLM), University of Rostock, 18059Rostock, Germany
| | - Barbara Giocastro
- Institute of Chemistry and Environmental Engineering, University of the Bundeswehr Munich, 85579Neubiberg, Germany
| | - Christopher P Rüger
- Joint Mass Spectrometry Centre (JMSC), Chair of Analytical Chemistry, University Rostock, 18059Rostock, Germany
- Department Life, Light & Matter (LLM), University of Rostock, 18059Rostock, Germany
| | - Thomas W Adam
- Institute of Chemistry and Environmental Engineering, University of the Bundeswehr Munich, 85579Neubiberg, Germany
- Joint Mass Spectrometry Center (JMSC) at Comprehensive Molecular Analytics (CMA), Helmholtz Munich, 85764Neuherberg, Germany
| | - Ralf Zimmermann
- Joint Mass Spectrometry Centre (JMSC), Chair of Analytical Chemistry, University Rostock, 18059Rostock, Germany
- Department Life, Light & Matter (LLM), University of Rostock, 18059Rostock, Germany
- Joint Mass Spectrometry Center (JMSC) at Comprehensive Molecular Analytics (CMA), Helmholtz Munich, 85764Neuherberg, Germany
| |
Collapse
|
4
|
Hettiyadura APS, Laskin A. Quantitative analysis of polycyclic aromatic hydrocarbons using high-performance liquid chromatography-photodiode array-high-resolution mass spectrometric detection platform coupled to electrospray and atmospheric pressure photoionization sources. JOURNAL OF MASS SPECTROMETRY : JMS 2022; 57:e4804. [PMID: 35019202 DOI: 10.1002/jms.4804] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 12/07/2021] [Accepted: 12/13/2021] [Indexed: 06/14/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are common pollutants present in atmospheric aerosols and other environmental mixtures. They are of particular air quality and human health concerns as many of them are carcinogenic toxins. They also affect absorption of solar radiation by aerosols, therefore contributing to the radiative forcing of climate. For environmental chemistry studies, it is advantageous to quantify PAH components using the same analytical technics that are commonly applied to characterize a broad range of polar analytes present in the same environmental mixtures. Liquid chromatography coupled with photodiode array and high-resolution mass spectrometric detection (LC-PDA-HRMS) is a method of choice for comprehensive characterization of chemical composition and quantification of light absorption properties of individual organic compounds present in the environmental samples. However, quantification of non-polar PAHs by this method is poorly established because of their imperfect ionization in electrospray ionization (ESI) technique. This tutorial article provides a comprehensive evaluation of the quantitative analysis of 16 priority pollutant PAHs in a standard reference material using the LC-MS platform coupled with the ESI source. Results are further corroborated by the quantitation experiments using an atmospheric pressure photoionization (APPI) method, which is more sensitive for the PAH detection. The basic concepts and step-by-step practical guidance for the PAHs quantitative characterization are offered based on the systematic experiments, which include (1) Evaluation effects of different acidification levels by formic acid on the (+)ESI-MS detection of PAHs. (2) Comparison of detection limits in ESI+ versus APPI+ experiments. (3) Investigation of the PAH fragmentation patterns in MS2 experiments at different collision energies. (4) Calculation of wavelength dependent mass absorption coefficient (MACλ) of the standard mixture and its individual PAHs using LC-PDA data. (5) Assessment of the minimal injected mass required for accurate quantification of MACλ of the standard mixture and of a multi-component environmental sample.
Collapse
Affiliation(s)
| | - Alexander Laskin
- Department of Chemistry, Purdue University, West Lafayette, Indiana, USA
- Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Indiana, USA
| |
Collapse
|
5
|
Yang E, Fournelle F, Chaurand P. Silver spray deposition for AgLDI imaging MS of cholesterol and other olefins on thin tissue sections. JOURNAL OF MASS SPECTROMETRY : JMS 2020; 55:e4428. [PMID: 31410898 DOI: 10.1002/jms.4428] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 07/26/2019] [Accepted: 08/05/2019] [Indexed: 06/10/2023]
Abstract
Olefins such as cholesterol and unsaturated fatty acids play important biological roles. Silver-assisted laser desorption ionization (AgLDI) takes advantage of the strong affinity of silver to conjugate with double bonds to selectively ionize these molecules for imaging mass spectrometry (IMS) experiments. For IMS studies, two main approaches for silver deposition have been described in the literature: fine coating by silver sputtering and spray deposition of silver nanoparticles. While these approaches allow for extremely high resolution IMS experiments to be conducted, they are not readily available to all laboratories. Herein, we present a silver nitrate spray deposition approach as an alternative to silver sputtering and nanoparticle deposition for routine IMS analysis. The silver nitrate spray has the same level of specificity and sensitivity for olefins, particularly cholesterol, and has shown to be capable of IMS experiments down to 10-μm spatial resolution. Minimal sample preparation and the affordability of silver nitrate make this a convenient and accessible technique worth considering.
Collapse
Affiliation(s)
- Ethan Yang
- Department of Chemistry, University of Montreal, Montreal, Quebec, Canada, H3C 3J7
| | - Frédéric Fournelle
- Department of Chemistry, University of Montreal, Montreal, Quebec, Canada, H3C 3J7
| | - Pierre Chaurand
- Department of Chemistry, University of Montreal, Montreal, Quebec, Canada, H3C 3J7
| |
Collapse
|
6
|
Ciric J, Verberne M, Bouwman L, Baltussen E. Development of UPLC-MSMS methods for the analysis of complex, sparsely soluble compounds in environmental toxicology. J Chromatogr B Analyt Technol Biomed Life Sci 2019; 1109:128-131. [PMID: 30754018 DOI: 10.1016/j.jchromb.2019.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 01/25/2019] [Accepted: 02/02/2019] [Indexed: 11/19/2022]
Affiliation(s)
- Jelena Ciric
- Charles River Laboratories Den Bosch BV, Hambakenwetering 7, 5231 DD 's-Hertogenbosch, the Netherlands.
| | - Maartje Verberne
- Charles River Laboratories Den Bosch BV, Hambakenwetering 7, 5231 DD 's-Hertogenbosch, the Netherlands
| | - Lydia Bouwman
- Charles River Laboratories Den Bosch BV, Hambakenwetering 7, 5231 DD 's-Hertogenbosch, the Netherlands
| | - Erik Baltussen
- Charles River Laboratories Den Bosch BV, Hambakenwetering 7, 5231 DD 's-Hertogenbosch, the Netherlands
| |
Collapse
|
7
|
Niyonsaba E, Manheim JM, Yerabolu R, Kenttämaa HI. Recent Advances in Petroleum Analysis by Mass Spectrometry. Anal Chem 2018; 91:156-177. [PMID: 30428670 DOI: 10.1021/acs.analchem.8b05258] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Edouard Niyonsaba
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Jeremy M. Manheim
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Ravikiran Yerabolu
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Hilkka I. Kenttämaa
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| |
Collapse
|
8
|
Liu S, Rogachev AY. Comprehensive Theoretical Study of Interactions between Ag + and Polycyclic Aromatic Hydrocarbons. Chemphyschem 2018; 19:2579-2588. [PMID: 29920888 DOI: 10.1002/cphc.201800297] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Indexed: 11/08/2022]
Abstract
The first comprehensive and systematic theoretical exploration of the bonding nature and energetics of the interactions between Ag(I) cation and a wide set of π-ligands was accomplished. This set ranges from simple ethylene and aromatic benzene to planar and curved polyaromatic molecules and to closed-cage C60 -fullerene. Simultaneous application of two energy decomposition schemes based on different ideas, namely, NBO-NEDA and EDA-NOCV, allowed shedding light on the nature of the bonding and its energetics. Importantly, our results unambiguously indicate that reliable results can be obtained only if using more than one theoretical approach. All methods clearly revealed the importance and even domination of the ionic contribution of the bonding in all adducts, except for those of C60 -fullerene, in which the covalent component was found to be the largest. Subsequent decomposition of the orbital term onto components showed that it consists of two major parts: (i) ligand-to-metal (π(C=C)→s(Ag), L→M) and (ii) metal-to-ligand (M→L) terms, with significant domination of the former. Interestingly, while the L→M component is essentially the same for all systems considered, the nature of the M→L one depends on the coordination site of the polycyclic aromatic hydrocarbons (PAH). In most of adducts, the M→L can be described as dxy (Ag)→π* (C=C) donation, whereas for systems [Ag-spoke-C12 H8 ]+ and [Ag-spoke-C20 H10 ]+ it corresponds to the dz 2 (Ag)→π* (C=C) type of interaction. As a result, the coordination mode in such complexes is switched from η2 -type to η1 . Thus, the nature of the bonding, its energetics and even coordination mode in adducts of unsaturated hydrocarbons with late transition metal cations should be considered as a function of many components, which primarily includes the topology and aromaticity of the (poly)aromatic molecules.
Collapse
Affiliation(s)
- Shuyang Liu
- Department of Chemistry, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Andrey Yu Rogachev
- Department of Chemistry, Illinois Institute of Technology, Chicago, IL 60616, USA
| |
Collapse
|
9
|
Duncan KD, Fang R, Yuan J, Chu RK, Dey SK, Burnum-Johnson KE, Lanekoff I. Quantitative Mass Spectrometry Imaging of Prostaglandins as Silver Ion Adducts with Nanospray Desorption Electrospray Ionization. Anal Chem 2018; 90:7246-7252. [PMID: 29676905 DOI: 10.1021/acs.analchem.8b00350] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Prostaglandins (PG) are an important class of lipid biomolecules that are essential in many biological processes, including inflammation and successful pregnancy. Despite a high bioactivity, physiological concentrations are typically low, which makes direct mass spectrometric analysis of endogenous PG species challenging. Consequently, there have not been any studies investigating PG localization to specific morphological regions in tissue sections using mass spectrometry imaging (MSI) techniques. Herein, we show that silver ions, added to the solvent used for nanospray desorption electrospray ionization (nano-DESI) MSI, enhances the ionization of PGs and enables nano-DESI MSI of several species in uterine tissue from day 4 pregnant mice. It was found that detection of [PG + Ag]+ ions increased the sensitivity by ∼30 times, when compared to [PG - H]- ions. Further, the addition of isotopically labeled internal standards enabled generation of quantitative ion images for the detected PG species. Increased sensitivity and quantitative MSI enabled the first proof-of-principle results detailing PG localization in mouse uterus tissue sections. These results show that PG species primarily localized to cellular regions of the luminal epithelium and glandular epithelium in uterine tissue. Further, this study provides a unique scaffold for future studies investigating the PG distribution within biological tissue samples.
Collapse
Affiliation(s)
- Kyle D Duncan
- Department of Chemistry-BMC , Uppsala University , SE-751 24 Uppsala , Sweden
| | - Ru Fang
- Department of Chemistry-BMC , Uppsala University , SE-751 24 Uppsala , Sweden
| | - Jia Yuan
- Division of Reproductive Sciences , Cincinnati Children's Hospital Medical Center , Cincinnati , Ohio 45229 , United States
| | - Rosalie K Chu
- Biological Sciences Division , Pacific Northwest National Laboratory , Richland , Washington 99352 , United States
| | - Sudhansu K Dey
- Division of Reproductive Sciences , Cincinnati Children's Hospital Medical Center , Cincinnati , Ohio 45229 , United States
| | - Kristin E Burnum-Johnson
- Biological Sciences Division , Pacific Northwest National Laboratory , Richland , Washington 99352 , United States
| | - Ingela Lanekoff
- Department of Chemistry-BMC , Uppsala University , SE-751 24 Uppsala , Sweden
| |
Collapse
|
10
|
Cha E, Jeong ES, Han SB, Cha S, Son J, Kim S, Oh HB, Lee J. Ionization of Gas-Phase Polycyclic Aromatic Hydrocarbons in Electrospray Ionization Coupled with Gas Chromatography. Anal Chem 2018; 90:4203-4211. [PMID: 29461802 DOI: 10.1021/acs.analchem.8b00401] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, gas-phase polycyclic aromatic hydrocarbons (PAHs) as nonpolar compounds were ionized to protonated molecular ions [M + H]+ without radical cations and simultaneously analyzed using gas chromatography (GC)/electrospray ionization (ESI)-tandem mass spectrometry (MS/MS). The ionization profile, dissociation, and sensitivity were first investigated to understand the significant behavior of gas-phase PAHs under ESI. The formation of protonated molecular ions of PAHs was distinguished according to the analyte phase and ESI spray solvents. The protonated PAHs exhibited characteristic dissociations, such as H-loss, H2-loss, and acetylene-loss, via competition of internal energy. In addition, GC/ESI-MS/MS resulted in relatively lower concentration levels (better sensitivity) for the limits-of-detection (LODs) of PAHs than liquid chromatography (LC)/ESI-MS/MS, and it seems to result from the characteristic ionization mechanism of the gas-phase analyte under ESI. Furthermore, the LODs of gas-phase PAHs depended on molecular weight and proton affinity (PA). Consequently, we demonstrated the relationship among the analyte phases, sensitivities, and structural characteristics (molecular weight and PA) under ESI. The gas-phase PAHs provided enhanced protonation efficiency and sensitivity using GC/ESI-MS/MS, as their molecular weight and PA increased. Based on these results, we offered important information regarding the behavior of gas-phase analytes under ESI. Therefore, the present GC/ESI-MS/MS method has potential as an alternative method for simultaneous analysis of PAHs.
Collapse
Affiliation(s)
- Eunju Cha
- Doping Control Center , Korea Institute of Science and Technology , Hwarang-ro 14-gil 5 , Seongbuk-gu, Seoul 02792 , Korea
| | - Eun Sook Jeong
- Doping Control Center , Korea Institute of Science and Technology , Hwarang-ro 14-gil 5 , Seongbuk-gu, Seoul 02792 , Korea
| | - Sang Beom Han
- Department of Pharmaceutical Analysis, College of Pharmacy , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Korea
| | - Sangwon Cha
- Department of Chemistry , Hankuk University of Foreign Studies , 81 Oedae-ro , Mohyeon-myeon, Cheoin-gu, Yongin-si , Gyeongi-do 17035 , Korea
| | - Junghyun Son
- Doping Control Center , Korea Institute of Science and Technology , Hwarang-ro 14-gil 5 , Seongbuk-gu, Seoul 02792 , Korea
| | - Sunghwan Kim
- Department of Chemistry , Kyungpook National University , 80 Daehakro , Buk-gu, Daegu 41566 , Korea
| | - Han Bin Oh
- Department of Chemistry , Sogang University , 35 Baekbeom-ro , Mapo-gu, Seoul 04107 , Korea
| | - Jaeick Lee
- Doping Control Center , Korea Institute of Science and Technology , Hwarang-ro 14-gil 5 , Seongbuk-gu, Seoul 02792 , Korea
| |
Collapse
|
11
|
Lu J, Zhang Y, Shi Q. Ionizing Aromatic Compounds in Petroleum by Electrospray with HCOONH4 as Ionization Promoter. Anal Chem 2016; 88:3471-5. [DOI: 10.1021/acs.analchem.6b00022] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jincheng Lu
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, China
| | - Yahe Zhang
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, China
| | - Quan Shi
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, China
| |
Collapse
|
12
|
Jiang P, Lucy CA. Retentivity, selectivity and thermodynamic behavior of polycyclic aromatic hydrocarbons on charge-transfer and hypercrosslinked stationary phases under conditions of normal phase high performance liquid chromatography. J Chromatogr A 2016; 1437:176-182. [DOI: 10.1016/j.chroma.2016.02.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 02/02/2016] [Accepted: 02/03/2016] [Indexed: 11/17/2022]
|
13
|
Method for analysis of 68 organic contaminants in food contact paper using gas and liquid chromatography coupled with tandem mass spectrometry. Food Control 2016. [DOI: 10.1016/j.foodcont.2015.07.043] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
14
|
Gao J, Huang C, Lin Y, Tong P, Zhang L. In situ solvothermal synthesis of metal-organic framework coated fiber for highly sensitive solid-phase microextraction of polycyclic aromatic hydrocarbons. J Chromatogr A 2016; 1436:1-8. [PMID: 26868446 DOI: 10.1016/j.chroma.2016.01.051] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 01/20/2016] [Accepted: 01/21/2016] [Indexed: 10/22/2022]
Abstract
The present work reported a facile and simple in situ solvothermal growth method for immobilization of metal-organic framework UiO-66 via covalent bonding on amino functional silica fiber for highly sensitive solid-phase microextraction (SPME) of ten polycyclic aromatic hydrocarbons (PAHs) by coupling with gas chromatography-mass spectrometry (GC-MS) analysis. The developed SPME coated fiber has been characterized through SEM, TGA and XRD, confirmed the coating thickness of ∼25μm with high thermal and chemical stability. Under optimized conditions, the obtained method exhibited satisfactory linearity in range of 1.0-5000.0ngL(-1) for all the PAHs. The low detection limits were from 0.28ngL(-1) to 0.60ngL(-1) (S/N=3). The UiO-66 coated fibers showed good repeatability (RSDs less than 8.2%, n=5) and satisfying reproducibility between fiber to fiber (RSDs less than 8.9%, n=5). This method was successfully used for simultaneous determination of ten PAHs from Minjiang water and soil samples with satisfactory recoveries of 87.0-113.6% and 83.8-116.7%, respectively. Experimental results shows that the chemical bonding approach has dramatically improve the stability and lifetime of pure MOFs coating for SPME in sample pretreatment.
Collapse
Affiliation(s)
- Jia Gao
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujia 350116, China
| | - Chuanhui Huang
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujia 350116, China
| | - Yifen Lin
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujia 350116, China
| | - Ping Tong
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujia 350116, China; Testing Center, The Sport Science Research Center, Fuzhou University, Fuzhou, Fujian 350002, China.
| | - Lan Zhang
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujia 350116, China; Testing Center, The Sport Science Research Center, Fuzhou University, Fuzhou, Fujian 350002, China.
| |
Collapse
|
15
|
Maier JM, Li P, Hwang J, Smith MD, Shimizu KD. Measurement of Silver−π Interactions in Solution Using Molecular Torsion Balances. J Am Chem Soc 2015; 137:8014-7. [DOI: 10.1021/jacs.5b04554] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Josef M. Maier
- Department
of Chemistry and
Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Ping Li
- Department
of Chemistry and
Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Jungwun Hwang
- Department
of Chemistry and
Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Mark D. Smith
- Department
of Chemistry and
Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Ken D. Shimizu
- Department
of Chemistry and
Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| |
Collapse
|
16
|
Kim SH, Cha EJ, Lee KM, Kim HJ, Kwon OS, Lee J. Simultaneous ionization and analysis of 84 anabolic androgenic steroids in human urine using liquid chromatography-silver ion coordination ionspray/triple-quadrupole mass spectrometry. Drug Test Anal 2014; 6:1174-85. [DOI: 10.1002/dta.1747] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 10/12/2014] [Accepted: 10/13/2014] [Indexed: 11/06/2022]
Affiliation(s)
- So-Hee Kim
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
- Department of Chemistry, Research Institute for Natural Sciences; Korea University; 145, Anam-ro, Seongbuk-gu Seoul 136-701 Korea
| | - Eun-Ju Cha
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
- Department of Chemistry, Research Institute for Natural Sciences; Korea University; 145, Anam-ro, Seongbuk-gu Seoul 136-701 Korea
| | - Kang Mi Lee
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
| | - Ho Jun Kim
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
| | - Oh-Seung Kwon
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
| | - Jaeick Lee
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
| |
Collapse
|
17
|
Gupta A, Sarkar J, Kumar A. High throughput analysis and capture of benzo[a]pyrene using supermacroporous poly(4-vinyl pyridine-co-divinyl benzene) cryogel matrix. J Chromatogr A 2013; 1278:16-21. [DOI: 10.1016/j.chroma.2012.12.074] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 12/18/2012] [Accepted: 12/29/2012] [Indexed: 11/28/2022]
|
18
|
Facile and tunable fabrication of Fe3O4/graphene oxide nanocomposites and their application in the magnetic solid-phase extraction of polycyclic aromatic hydrocarbons from environmental water samples. Talanta 2012; 101:388-95. [DOI: 10.1016/j.talanta.2012.09.046] [Citation(s) in RCA: 299] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Revised: 09/13/2012] [Accepted: 09/22/2012] [Indexed: 11/18/2022]
|
19
|
Gosetti F, Chiuminatto U, Mazzucco E, Robotti E, Calabrese G, Gennaro MC, Marengo E. Simultaneous determination of thirteen polycyclic aromatic hydrocarbons and twelve aldehydes in cooked food by an automated on-line solid phase extraction ultra high performance liquid chromatography tandem mass spectrometry. J Chromatogr A 2011; 1218:6308-18. [DOI: 10.1016/j.chroma.2011.06.085] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 06/15/2011] [Accepted: 06/22/2011] [Indexed: 11/26/2022]
|
20
|
Hollosi L, Wenzl T. Development and optimisation of a dopant assisted liquid chromatographic-atmospheric pressure photo ionisation-tandem mass spectrometric method for the determination of 15+1 EU priority PAHs in edible oils. J Chromatogr A 2010; 1218:23-31. [PMID: 21122869 DOI: 10.1016/j.chroma.2010.10.015] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 09/28/2010] [Accepted: 10/04/2010] [Indexed: 10/18/2022]
Abstract
European food legislation defines a set of 16 polycyclic aromatic hydrocarbons (PAHs) as of high concern for human health. The EU set contains structurally very similar PAHs with ring numbers between 4 and 6, and so raises some separation aspects and problems, which were not experienced with traditionally analysed PAHs. Many of the currently applied gas chromatographic mass spectrometric (GC-MS) methods suffer from separation problems, while high performance liquid chromatography with fluorescence detection (HPLC-FLD) is neither capable of detecting the whole set of EU priority PAHs nor does it (compared to GC-MS) allow structural identification. In addition HPLC-FLD shows limitations with difficult matrices due to interferences. The aim of this paper is to fill this gap by describing a liquid chromatographic dopant assisted atmospheric pressure photo ionisation tandem mass spectrometric (LC-DA-APPI-MS/MS) method for the determination of 15+1 EU priority PAHs in edible oil, which complies with the requirements set by European food legislation. Measurements were performed in positive ion mode. Anisole at a flow rate of 30 μl/min was used as dopant. Sample preparation was performed offline by donor-acceptor complex chromatography (DACC). Compared to HPLC-FLD methods the presented method enables the determination of all 15+1 EU priority PAHs at the low μg/kg concentration range including less fluorescence active compounds like benzo[j]fluoranthene and indeno[1,2,3-cd]pyrene. By analysing four reference materials it could be demonstrated that this method provides accurate results and is sufficiently sensitive for food control purposes. Statistically significant differences between the reference values and the measured analyte contents were not found. The method performs well also for very complex samples. Repeatability relative standard deviations (RSDr) of the determination of the target PAHs in olive oil were for most analytes below 5%. The limit of detection (LOD) of the method met the requirement set by EU legislation (0.3 μg/kg).
Collapse
Affiliation(s)
- Laszlo Hollosi
- European Commission, Directorate General Joint Research Centre, Institute for Reference Materials and Measurements, Retieseweg 111, B-2440 Geel, Belgium
| | | |
Collapse
|
21
|
Cha HJ, Kim NH, Jeong EK, Na YC. Analysis of Heterocyclic Amines in Human Urine Using Multiple Solid-Phase Extraction by Liquid Chromatography/Mass Spectrometry. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.8.2322] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
22
|
Ma J, Xiao R, Li J, Yu J, Zhang Y, Chen L. Determination of 16 polycyclic aromatic hydrocarbons in environmental water samples by solid-phase extraction using multi-walled carbon nanotubes as adsorbent coupled with gas chromatography–mass spectrometry. J Chromatogr A 2010; 1217:5462-9. [DOI: 10.1016/j.chroma.2010.06.060] [Citation(s) in RCA: 188] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Revised: 06/16/2010] [Accepted: 06/23/2010] [Indexed: 10/19/2022]
|
23
|
Ehrenhauser FS, Wornat MJ, Valsaraj KT, Rodriguez P. Design and evaluation of a dopant-delivery system for an orthogonal atmospheric-pressure photoionization source and its performance in the analysis of polycyclic aromatic hydrocarbons. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2010; 24:1351-1357. [PMID: 20391608 DOI: 10.1002/rcm.4518] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Atmospheric-pressure photoionization (APPI) mass spectrometry benefits from the addition of an ionization-enhancing dopant such as benzene. A passive dopant-delivery system has therefore been designed for use with the orthogonal APPI source within a commercial liquid chromatographic instrument with mass spectrometric detector. By providing the dopant in the gas phase, the newly designed equipment avoids mixing problems and other difficulties associated with liquid dopant addition. The system is a simple and durable design that can reliably deliver virtually any dopant with sufficient vapor pressure in the temperature range of 20 to 120 degrees C. At the optimum dopant flow rate (10% of the mobile phase flow rate) for high-performance liquid chromatography with narrow-bore (2.1 mm) columns, the system allows for uninterrupted routine analysis for up to two weeks. The performance of the device has been evaluated with benzene as dopant and with a test mixture consisting of four polycyclic aromatic hydrocarbons (PAH): naphthalene, 9H-fluorene, anthracene, and phenanthrene. All four PAH can be detected with an excellent signal-to-noise ratio in the scanning mode and a limit of detection down to 0.42 ng on column (51 pg in single-ion monitoring mode). The concentration calibration curves are linear over a range of three orders of magnitude, with correlation coefficients greater than 0.99. The utilization of benzene as dopant not only increases the sensitivity significantly - 20-fold, compared with dopant-free operation - but the low m/z values of the background ions observed also allow for the effective quantitative and qualitative analysis of PAH.
Collapse
Affiliation(s)
- Franz S Ehrenhauser
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
| | | | | | | |
Collapse
|
24
|
Lévêque NL, Héron S, Tchapla A. Regioisomer characterization of triacylglycerols by non-aqueous reversed-phase liquid chromatography/electrospray ionization mass spectrometry using silver nitrate as a postcolumn reagent. JOURNAL OF MASS SPECTROMETRY : JMS 2010; 45:284-296. [PMID: 20049691 DOI: 10.1002/jms.1713] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Triacylglycerols (TAGs) provide a challenge for mass spectrometry (MS) analysis because of their complexity. In particular, for dietary, nutritional and metabolic purposes, the positional placement of fatty acids on the glycerol backbone of TAGs is a crucial aspect. To solve this problem, we have investigated the TAGs' fragmentation patterns using an ion trap mass spectrometer. A series of pure regioisomeric pairs of TAGs (POP/PPO, POO/OPO and OSO/SOO) were cationized by Ag(+) after their separation by non-aqueous reversed-phase liquid chromatography (NARP-LC) before MS to improve MS sensitivity. Electrospray ionization-MS (ESI-MS) conditions were optimized in order to produce characteristic [M + Ag + AgNO(3)](+) ions from each TAG, which were then fragmented to produce MS/MS spectra and then fragmented further to produce up to MS(5) spectra. The observation of ions produced by LC-MS(5) of on-line Ag(+)-cationized TAG provided unambiguous information on the fatty acid distribution on the glycerol backbone. These strategies of MS to MS(5) experiments were applied to identify components and to determine the regiospecificity of TAG within a complex mixture of lipids in natural oils.
Collapse
Affiliation(s)
- Nathalie L Lévêque
- Groupe de Chimie Analytique de Paris Sud EA 4041, LETIAM, IUT d'Orsay (Université Paris Sud), Plateau de Moulon, F 91400 Orsay, France.
| | | | | |
Collapse
|
25
|
Tanaka H, Takino M, Sugita-Konishi Y, Tanaka T, Toriba A, Hayakawa K. Determination of nivalenol and deoxynivalenol by liquid chromatography/atmospheric pressure photoionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2009; 23:3119-3124. [PMID: 19714706 DOI: 10.1002/rcm.4233] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Fusarium species, a plant pathogenic fungus of wheat and other cereals, produces toxic metabolites such as nivalenol (NIV) and deoxynivalenol (DON). Control of contamination by these toxins is very difficult, and a continuous survey of the occurrence is necessary for these toxins. Thus, the accurate and convenient determination of the cereals contaminated with these toxins is important for the supply of safe foods. A selective analytical method based on high-performance liquid chromatography, combined with atmospheric pressure photoionization (APPI) mass spectrometry, has been developed for simultaneous determination of NIV and DON. The parameters investigated for the optimization of APPI were the ion source parameters fragmentor voltage, capillary voltage, and vaporizer temperature, and also mobile phase composition and flow rate. Furthermore, chemical noise and signal suppression of analyte signals due to sample matrix interference were investigated for APPI. The results indicated that APPI provides lower matrix effect and the correlation coefficient of NIV and DON in the range 0.2-100 ng x mL(-1) was above 0.999. Recoveries of NIV and DON in wheat ranged from 86 to 107% and limits of detection of NIV and DON were 0.20 ng x g(-1) and 0.39 ng x g(-1), respectively. In addition, the proposed method was applied for the analysis of naturally contaminated wheat samples. APPI was found to offer lower matrix effect and was a convenient technique for routine analysis of NIV and DON residues in wheat at trace levels.
Collapse
Affiliation(s)
- Hiroki Tanaka
- National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan.
| | | | | | | | | | | |
Collapse
|
26
|
Zhao X, Liu X, Zhao Z, Huang C, Zhang M, Wang H, Wang X. Homogeneous liquid-liquid extraction combined with high performance liquid chromatography-fluorescence detection for determination of polycyclic aromatic hydrocarbons in vegetables. J Sep Sci 2009; 32:2051-7. [DOI: 10.1002/jssc.200900019] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
27
|
Cai SS, Syage JA, Hanold KA, Balogh MP. Ultra Performance Liquid Chromatography−Atmospheric Pressure Photoionization-Tandem Mass Spectrometry for High-Sensitivity and High-Throughput Analysis of U.S. Environmental Protection Agency 16 Priority Pollutants Polynuclear Aromatic Hydrocarbons. Anal Chem 2009; 81:2123-8. [DOI: 10.1021/ac802275e] [Citation(s) in RCA: 126] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Sheng-Suan Cai
- Syagen Technology, Incorporated, 1411 Warner Avenue, Tustin, California 92780, and Waters Corporation, 34 Maple Street, Milford, Massachusetts 01757
| | - Jack A. Syage
- Syagen Technology, Incorporated, 1411 Warner Avenue, Tustin, California 92780, and Waters Corporation, 34 Maple Street, Milford, Massachusetts 01757
| | - Karl A. Hanold
- Syagen Technology, Incorporated, 1411 Warner Avenue, Tustin, California 92780, and Waters Corporation, 34 Maple Street, Milford, Massachusetts 01757
| | - Michael P. Balogh
- Syagen Technology, Incorporated, 1411 Warner Avenue, Tustin, California 92780, and Waters Corporation, 34 Maple Street, Milford, Massachusetts 01757
| |
Collapse
|
28
|
Determination of priority carcinogenic polycyclic aromatic hydrocarbons in wastewater and surface water by coacervative extraction and liquid chromatography–fluorimetry. J Chromatogr A 2008; 1203:168-76. [DOI: 10.1016/j.chroma.2008.07.044] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2008] [Revised: 07/10/2008] [Accepted: 07/15/2008] [Indexed: 11/17/2022]
|
29
|
Lien GW, Chen CY, Wu CF. Analysis of polycyclic aromatic hydrocarbons by liquid chromatography/tandem mass spectrometry using atmospheric pressure chemical ionization or electrospray ionization with tropylium post-column derivatization. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2007; 21:3694-3700. [PMID: 17937449 DOI: 10.1002/rcm.3267] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) with four to six rings are potent carcinogens. This study analyzed ten of the sixteen US EPA priority PAHs using reversed-phase liquid chromatography/tandem mass spectrometry (LC/MS/MS) in selected reaction monitoring mode with two ionization sources: positive atmospheric pressure chemical ionization (APCI+) or positive elecrtrospray ionization (ESI+) with tropylium post-column derivatization. Several factors were investigated, including mobile phases, stationary phases of columns and chromatographic temperature, to determine how optimal separation and sensitivity might be achieved. Methanol used as an organic mobile phase provided better sensitivities for most PAHs than acetonitrile, although some PAHs co-eluted. Acidic buffers did not increase analyte signals. Use of Restek Pinnacle II PAH columns (250 x 4.6 mm or 250 x 2.1 mm, 5 microm) with water/acetonitrile gradient at 27 degrees C made possible a good separation of the ten analytes. [M]+. were the best precursor ions in both APCI and ESI, although fluoranthene could not be detected in ESI mode when tropylium post-column derivatization was performed. [M-28]+ and [M-52]+ were the major product ions of PAHs after collision-induced dissociation, a result of neutral losses of C(2)H(4) and (C(2)H(2))(2), respectively. Chromatographic separation for PAH isomers was crucial because the mass spectra were so similar that even MS/MS could not distinguish them from each other. The recoveries of sample preparations of PAHs spiked onto air-sampling filters ranged between 77.5 and 106% with relative standard deviations between 1.1 and 15.9%. This method was validated by analyzing NIST SRM 1649a (urban dust), producing results comparable with the certified PAH concentrations. The detection limits using APCI and ESI interfaces, defined as three times the noise levels, ranged between 0.23 and 0.83 ng and between 0.16 and 0.84 ng of on-column injection, respectively.
Collapse
Affiliation(s)
- Guang-Wen Lien
- Institute of Environmental Health, College of Public Health, National Taiwan University, Taipei 10055, Taiwan
| | | | | |
Collapse
|
30
|
González-Piñuela C, Alonso-Salces RM, Andrés A, Ortiz I, Viguri JR. Validated analytical strategy for the determination of polycyclic aromatic compounds in marine sediments by liquid chromatography coupled with diode-array detection and mass spectrometry. J Chromatogr A 2006; 1129:189-200. [PMID: 16876176 DOI: 10.1016/j.chroma.2006.07.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2006] [Revised: 06/09/2006] [Accepted: 07/03/2006] [Indexed: 11/16/2022]
Abstract
The aim of this work was to optimise and validate the experimental conditions for the analysis of 20 polycyclic aromatic compounds (PACs) [19 polycyclic aromatic hydrocarbons (PAHs) and dibenzothiophene as polycyclic aromatic sulphur heterocycle (PASH)] in marine sediments by reversed-phase high-performance liquid chromatography (LC) coupled to photodiode array detection (DAD) and to mass spectrometry (MS). The LC-MS interface used was atmospheric pressure chemical ionization (APCI) in the positive ion mode. The operational parameters of the APCI interface and MS detection, such as organic modifier, fragmentation voltage, gain, vaporizer temperature, corona current, capillary voltage, drying gas (N2) and nebulizer pressure, were studied. The sediments were subjected to microwave-assisted solvent extraction (MAE) and clean-up by solid-phase extraction (SPE). The relevance of the selected PACs lies in the fact that 16 PACs are classified by the US Environmental Protection Agency as priority pollutants; 17 PACs are detected in the Prestige oil spill; and 8 PACs are included in the priority substance list of the EU water policy. Recoveries from 47% to 102% were obtained for SRM 1944 certified reference sediment. The limits of quantitation were lower than 100 ngg(-1) dry weight for most PACs, and good precision was achieved.
Collapse
Affiliation(s)
- Cristina González-Piñuela
- Chemical Engineering and Inorganic Chemistry Department, ETSIIT, University of Cantabria, Avda Los Castros s/n, Santander, Spain
| | | | | | | | | |
Collapse
|
31
|
Zheng J, Shamsi SA. Capillary Electrochromatography Coupled to Atmospheric Pressure Photoionization Mass Spectrometry for Methylated Benzo[a]pyrene Isomers. Anal Chem 2006; 78:6921-7. [PMID: 17007515 DOI: 10.1021/ac061024c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Benzo[a]pyrene, one of the most carcinogenic PAHs, has 12 monomethylated positional isomers (MBAPs). A strong correlation between the carcinogenicity of these isomers and methyl substitution has been reported. In this study, on-line coupling of capillary electrochromatography (CEC) and atmospheric pressure photoionization mass spectrometry (APPI-MS) provides a unique solution to highly selective separation and sensitive detection of MBAP isomers. The studies indicated that APPI provides significantly better sensitivity compared to electrospray ionization and atmospheric pressure chemical ionization modes of MS. A systematic investigation of APPI-MS detection parameters and CEC separation is established. First, several sheath liquid parameters (including type and concentration of volatile buffers, type and content of organic modifiers, use of dopants and inorganic/organic additives, and sheath liquid flow rate) and APPI-MS spray chamber parameters (capillary voltage, vaporizer temperature, nebulizer pressure) were found to have effects on detection sensitivity as well as the profile of mass spectrum. For example, when ammonium acetate was replaced with acetic acid in the sheath liquid, the MS signal was enhanced as much as 90% and the formation of ammonia adduct was effectively suppressed. Next, the separation of MBAP isomers was conducted on internal tapered columns packed with polymeric C18 stationary phase. With the use of a mobile phase consisting of slightly higher acetonitrile content (90%,v/v) and a small amount of tropylium ion, the analysis times were significantly shortened by 20 min without compromising the resolutions between the isomers. Finally, quantitative aspects of the CEC-APPI-MS method were demonstrated using 7-MBAP as the internal standard. The calibration curves of three of the most carcinogenic isomers, namely, 1-MBAP, 3-MBAP, and 11-MBAP, showed good linearity in the range of 2.5-50 microg/mL with a limit of detection at 400 ng/mL.
Collapse
Affiliation(s)
- Jie Zheng
- Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, Georgia 30303, USA
| | | |
Collapse
|
32
|
Droste S, Schellenträger M, Constapel M, Gäb S, Lorenz M, Brockmann KJ, Benter T, Lubda D, Schmitz OJ. A silica-based monolithic column in capillary HPLC and CEC coupled with ESI-MS or electrospray-atmospheric-pressure laser ionization-MS. Electrophoresis 2005; 26:4098-103. [PMID: 16252331 DOI: 10.1002/elps.200500326] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We describe the successful coupling of CEC and capillary HPLC with the recently developed atmospheric-pressure laser ionization (APLI) method. APLI is suitable for selectively and sensitively ionizing nonpolar aromatic compounds at ambient pressure for subsequent mass-selective detection. The polycyclic aromatic hydrocarbons used as analytes are first separated either by CEC on a silica-based monolithic column or by capillary HPLC. The eluent, along with a sheath flow, is volatilized by microelectrospray and then selectively ionized by excimer laser (KrF*) radiation via two-photon excitation. A QTOF-MS is used as mass-selective detector. This interface combination makes soft ionization of thermally labile nonpolar aromatic analytes possible.
Collapse
Affiliation(s)
- Stefan Droste
- Department of Analytical Chemistry, University of Wuppertal, Wuppertal, Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Thompson RQ, Phinney KW, Welch MJ, White E. Quantitative determination of capsaicinoids by liquid chromatography–electrospray mass spectrometry. Anal Bioanal Chem 2005; 381:1441-51. [PMID: 15803309 DOI: 10.1007/s00216-005-3102-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2004] [Revised: 01/03/2005] [Accepted: 01/14/2005] [Indexed: 11/29/2022]
Abstract
Eight naturally occurring capsaicinoids have been determined in Capsicum by use of high-purity standards, with norcapsaicin as an internal standard. The solid standards were rigorously checked for purity. The sensitivity of electrospray ionization (ESI), atmospheric-pressure chemical ionization (APCI), and coordination ion-spray (CIS; with silver) toward the capsaicinoids were measured and compared. The highest sensitivity was found for positive-ion ESI. Method validation of the liquid chromatography-ESI-mass spectrometry (LC-ESI-MS) determination is reported, including tests for repeatability (4%), detection limit (5 pg injected), linear range (20-6 ng injected), quantitation (excellent linearity; < 2% relative standard deviation), and recovery (99-103%). The major and minor capsaicinoids in a commercial plant extract and in chili pepper fruits were quantified.
Collapse
Affiliation(s)
- Robert Q Thompson
- Department of Chemistry, Oberlin College, 119 Woodland Street, Oberlin, OH 44074, USA.
| | | | | | | |
Collapse
|
34
|
Constapel M, Schellenträger M, Schmitz OJ, Gäb S, Brockmann KJ, Giese R, Benter T. Atmospheric-pressure laser ionization: a novel ionization method for liquid chromatography/mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2005; 19:326-336. [PMID: 15645511 DOI: 10.1002/rcm.1789] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We report on the development of a new laser-ionization (LI) source operating at atmospheric pressure (AP) for liquid chromatography/mass spectrometry (LC/MS) applications. APLI is introduced as a powerful addition to existing AP ionization techniques, in particular atmospheric-pressure chemical ionization (APCI), electrospray ionization (ESI), and atmospheric pressure photoionization (APPI). Replacing the one-step VUV approach in APPI with step-wise two-photon ionization strongly enhances the selectivity of the ionization process. Furthermore, the photon flux during an ionization event is drastically increased over that of APPI, leading to very low detection limits. In addition, the APLI mechanism generally operates primarily directly on the analyte. This allows for very efficient ionization even of non-polar compounds such as polycyclic aromatic hydrocarbons (PAHs). The APLI source was characterized with a MicroMass Q-Tof Ultima II analyzer. Both the effluent of an HPLC column containing a number of PAHs (benzo[a]pyrene, fluoranthene, anthracene, fluorene) and samples from direct syringe injection were analyzed with respect to selectivity and sensitivity of the overall system. The liquid phase was vaporized by a conventional APCI inlet (AP probe) with the corona needle removed. Ionization was performed through selective resonance-enhanced multi-photon ionization schemes using a high-repetition-rate fixed-frequency excimer laser operating at 248 nm. Detection limits well within the low-fmol regime are readily obtained for various aromatic hydrocarbons that exhibit long-lived electronic states at the energy level of the first photon. Only molecular ions are generated at the low laser fluxes employed ( approximately 1 MW/cm(2)). The design and performance of the laser-ionization source are presented along with results of the analysis of aromatic hydrocarbons.
Collapse
Affiliation(s)
- M Constapel
- Division of Analytical Chemistry, University of Wuppertal, Gauss-Str. 20, 42119 Wuppertal, Germany
| | | | | | | | | | | | | |
Collapse
|
35
|
Hayen H, Alvarez-Grima MM, Debnath SC, Noordermeer JWM, Karst U. Liquid Chromatography/Coordination Ion Spray-Mass Spectrometry for the Analysis of Rubber Vulcanization Products. Anal Chem 2004; 76:1063-8. [PMID: 14961739 DOI: 10.1021/ac035017p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Liquid chromatography/coordination ion spray-mass spectrometry has been used for the identification of reaction products in a model rubber vulcanization process. After LC separation using reversed-phase conditions, AgBF(4) in acetonitrile was added, and strong signals were observed for silica-rubber coupling agents and products of the reaction between these and alkenes. The method performs best for substances containing sulfur chains with chain lengths between two and eight sulfur atoms, but sulfur-free compounds containing triethoxysilyl groups were detected as well. For the latter, the postcolumn addition of NaBF(4) proved to be a suitable alternative. Besides the coupling agents, various reaction products, including sulfur-chain bridged alkenes were identified.
Collapse
Affiliation(s)
- Heiko Hayen
- Department of Chemical Analysis, and MESA+ Research Institute and Rubber Technology Department, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | | | | | | | | |
Collapse
|
36
|
Takino M, Daishima S, Nakahara T. Determination of chloramphenicol residues in fish meats by liquid chromatography–atmospheric pressure photoionization mass spectrometry. J Chromatogr A 2003; 1011:67-75. [PMID: 14518764 DOI: 10.1016/s0021-9673(03)01065-3] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A liquid chromatography-atmospheric pressure photoionization (APPI) mass spectrometry method was developed for the determination of chloramphenicol (CAP) in fish meats (young yellowtail and flatfish). For the optimization of APPI, several APPI ion source parameters and mobile phases were investigated. CAP with APPI using the optimized parameters gave simple mass spectra and a strong signal corresponding to [M-H]- was observed. Further, APPI was compared with atmospheric pressure chemical ionization (APCI) and APPI gave similar results in terms of structural information and a better signal-to-noise ratio. The samples were extracted with acetonitrile and evaporated to dryness followed by a clean-up step using the liquid-liquid distribution between acetonitrile and n-hexane. The mean recoveries of chloramphenicol from a young yellowtail meat and a flatfish meat spiked at 0.1-2 ng/g were 89.3-102.5 and 87.4-94.8%, respectively. The limit of detection (signal-to-noise ratio = 3) of the young yellowtail meat and the flatfish meat were 0.1 and 0.27 ng/g.
Collapse
Affiliation(s)
- Masahiko Takino
- Kansai branch office, Yokogawa Analytical Systems Inc., 3-3-11 Kinryo Bld. Niitaka, Yodogawa, Osaka 532-0033, Japan.
| | | | | |
Collapse
|
37
|
Hayen H, Karst U. Strategies for the liquid chromatographic-mass spectrometric analysis of non-polar compounds. J Chromatogr A 2003; 1000:549-65. [PMID: 12877188 DOI: 10.1016/s0021-9673(03)00505-3] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Electrospray ionization and atmospheric pressure chemical ionization (APCI) have evolved recently as very useful tools for the liquid chromatographic-mass spectrometric (LC-MS) analysis of polar substances. Non-polar compounds, however, are difficult to analyze with these atmospheric pressure ionization techniques due to their soft ionization mechanism. Recently, new approaches have been introduced which are likely to overcome this obstacle, at least partly. On-line electrochemical conversion of the analytes to more polar reaction products, atmospheric pressure photoionization, atmospheric pressure electron capture negativeion-MS and coordination ionspray-MS are four techniques which are presented in detail compared and discussed critically with respect to their current status and future perspectives. Particular focus is directed from a chemical viewpoint on the substance groups which are accessible by each of the new approaches.
Collapse
Affiliation(s)
- Heiko Hayen
- University of Twente, Department of Chemical Analysis, MESA Research Institute, P.O. Box 217, 7500 AE Enschede, Netherlands
| | | |
Collapse
|
38
|
Reemtsma T. Liquid chromatography-mass spectrometry and strategies for trace-level analysis of polar organic pollutants. J Chromatogr A 2003; 1000:477-501. [PMID: 12877185 DOI: 10.1016/s0021-9673(03)00507-7] [Citation(s) in RCA: 169] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Liquid chromatography-mass spectrometry using atmospheric pressure ionization (LC-API-MS) has drastically changed the analytical methods used to detect polar pollutants in water. The present status of application of this technique to organic water constituents is reviewed. The selection of the appropriate LC conditions, whether reversed-phase liquid chromatography, ion-pair chromatography, capillary electrophoresis or ion chromatography, and of the most sensitive ionization mode, electrospray ionization (ESI) or atmospheric pressure chemical ionization (APCI), depends upon the polarity and acidity of the analytes. Strongly acidic compounds such as aromatic sulfonates, sulfonated dyes, haloacetic acids, linear alkylbenzene sulfonates, aliphatic sulfonates and sulfates and complexing agents, weakly acidic compounds such as carboxylates and phenols, neutral compound classes, namely alkylphenol ethoxylates, alcohol ethoxylates and polycyclic aromatic hydrocarbons and the basic toxins, quaternary ammonium compounds and organometallic compounds are considered. The selection of the mass spectrometer depends upon the analytical task: triple-quadrupole mass spectrometers are highly suited for sensitive quantitation and for qualitative analyses, ion traps are especially suited for structure elucidation, whereas time-of-flight mass spectrometers and quadrupole time-of-flight mass spectrometers with their higher mass resolution are ideal for the determination of molecular formulas of unknown compounds and for screening purposes. While large steps have already been made, future efforts with respect to water analysis may be directed at fine-tuning the methodical arsenal for increased sensitivity and selectivity and to extend LC-MS application to transformation products.
Collapse
Affiliation(s)
- Thorsten Reemtsma
- Department of Water Quality Control, Technical University of Berlin, Sekr KF 4, Strasse des 17 Juni 135, 10623 Berlin, Germany.
| |
Collapse
|
39
|
Takino M, Daishima S, Nakahara T. Determination of perfluorooctane sulfonate in river water by liquid chromatography/atmospheric pressure photoionization mass spectrometry by automated on-line extraction using turbulent flow chromatography. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2003; 17:383-390. [PMID: 12590385 DOI: 10.1002/rcm.937] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A simple, fast and sensitive liquid chromatography/atmospheric pressure photoionization mass spectrometry (LC/APPI-MS) method, with automated on-line extraction using turbulent flow chromatography (TFC), was developed for the determination of perfluorooctane sulfonate (PFOS) in river water. In this method, following an on-line extraction by injection onto a column under TFC conditions, PFOS is back-flushed onto a reversed-phase column via on-line column switching, and resolved chromatographically at a laminar flow rate of 1 mL min(-1). Using this tandem LC-LC/APPI-MS system the extraction, separation and selective detection of PFOS in river water could be achieved with satisfactory selectivity and sensitivity. The limit of detection (LOD) (S/N = 3) and the limit of quantitation (LOQ) (S/N = 10)were 5.35 and 17.86 pg mL(-1). The described procedure was very simple since no off-line sample preparation was required, total analysis time being 18.75 min.
Collapse
Affiliation(s)
- Masahiko Takino
- Kansai Branch Office, Yokogawa Analytical Systems Inc., Yodogawa, Osaka, Japan.
| | | | | |
Collapse
|
40
|
Current literature in mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2002; 37:234-240. [PMID: 11857770 DOI: 10.1002/jms.249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|