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Konorev D, Bellamri M, Wu CF, Wu MT, Turesky RJ. High-Field Asymmetric Waveform Ion Mobility Spectrometry Analysis of Carcinogenic Aromatic Amines in Tobacco Smoke with an Orbitrap Tribrid Mass Spectrometer. Chem Res Toxicol 2023; 36:1419-1426. [PMID: 37462928 PMCID: PMC10530005 DOI: 10.1021/acs.chemrestox.3c00143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Smoking is a risk factor for bladder cancer (BC), although the specific chemicals responsible for BC remain uncertain. Considerable research has focused on aromatic amines (AAs), including o-toluidine (o-tol), o-anisidine (o-anis), 2-naphthylamine (2-NA), and 4-aminobiphenyl (4-ABP), which are linked to human BC based on elevated BC incidence in occupationally exposed factory workers. These AAs arise at nanogram levels per combusted cigarette. The unambiguous identification of AAs, particularly low-molecular-weight monocyclic AAs in tobacco smoke extracts, by liquid chromatography-mass spectrometry (LC-MS) is challenging due to their poor performance on reversed-phase columns and co-elution with isobaric interferences from the complex tobacco smoke matrix. We employed a tandem liquid-liquid and solid-phase extraction method to isolate AAs from the basic fraction of tobacco smoke condensate (TSC) and utilized high-field asymmetric waveform ion mobility spectrometry (FAIMS) coupled to high-resolution accurate mass (HRAM) Orbitrap LC-MS2 to assay AAs in TSC. The employment of FAIMS greatly reduced sample complexity by removing precursor co-isolation interfering species at the MS1 scan stage, resulting in dramatically improved signal-to-noise of the precursor ions and cleaner, high-quality MS2 spectra for unambiguous identification and quantification of AAs in TSC. We demonstrate the power of LC/FAIMS/MS2 by characterizing and quantifying two low-molecular-weight carcinogenic AAs, o-tol and o-anis, in TSC, using stable isotopically labeled internal standards. These results demonstrate the power of FAIMS in trace-level analyses of AA carcinogens in the complex tobacco smoke matrix.
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Affiliation(s)
- Dmitri Konorev
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455
- IDEXX Laboratories, Inc, 1 IDEXX Dr, Westbrook, ME 04092
| | - Medjda Bellamri
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455
| | - Chia-Fang Wu
- International Master Program of Translational Medicine, National United University, Miaoli, Taiwan
- Research Center for Precision Environmental Medicine, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Ming Tsang Wu
- Research Center for Precision Environmental Medicine, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
- Department of Family Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 807, Taiwan
| | - Robert J. Turesky
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455
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Zhang S, Chen X, Wong HTK, Lui TY, Hu D, Chan TWD. CaptiveSpray Differential Ion Mobility Spectrometry Device with Enhanced Ion Transmission and Improved Resolving Power. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023; 34:820-825. [PMID: 37036088 DOI: 10.1021/jasms.3c00009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A performance enhanced CaptiveSpray differential ion mobility device was designed and constructed by incorporating a circular channel and a gas flow homogenizing channel (GFHC) between the CaptiveSpray ion source and planar differential ion mobility spectrometry (DMS). The GFHC was used to reduce gas flow heterogeneity prior to the entrance of the DMS device. The optimal flared entrance greatly reduces gas flow velocity at the inlet region owing to its relatively large gas inlet interface, which assists in reducing disparities between the minimum and maximum gas velocity along the x-axis. The circular electrode was machined with channels along the x- and y-axis for the passage of auxiliary gas and was applied with a potential to focus the incoming ions from the CaptiveSpray source into the DMS channel. Using reserpine as a reference standard, substantial signal enhancement was achieved with a concomitant reduction of the peak width in the ionogram.
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Affiliation(s)
- Simin Zhang
- Department of Chemistry, The Chinese University of Hong Kong, Hong Kong SAR, P. R. China
| | - Xiangfeng Chen
- Department of Chemistry, The Chinese University of Hong Kong, Hong Kong SAR, P. R. China
- School of Pharmaceutical Science, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong 250014, P. R. China
| | - H-T Kitty Wong
- Department of Chemistry, The Chinese University of Hong Kong, Hong Kong SAR, P. R. China
| | - T-Y Lui
- Department of Chemistry, The Chinese University of Hong Kong, Hong Kong SAR, P. R. China
| | - Danna Hu
- Department of Chemistry, The Chinese University of Hong Kong, Hong Kong SAR, P. R. China
| | - T-W Dominic Chan
- Department of Chemistry, The Chinese University of Hong Kong, Hong Kong SAR, P. R. China
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Hooshfar S, Tchu S, Yun C, Lynch KL. Development of a high-throughput differential mobility separation-tandem mass spectrometry (DMS-MS/MS) method for clinical urine drug testing. J Mass Spectrom Adv Clin Lab 2022; 23:50-57. [PMID: 35036987 PMCID: PMC8753179 DOI: 10.1016/j.jmsacl.2021.12.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 12/21/2021] [Accepted: 12/30/2021] [Indexed: 11/29/2022] Open
Abstract
INTRODUCTION Differential mobility separation (DMS) is an analytical technique used for rapid separation of ions and isomers based on gas phase mobility prior to entering a mass spectrometer for analysis. The entire DMS process is accomplished in fewer than 20 ms and can be used as a rapid alternative to chromatographic separation. OBJECTIVE The primary objective was to evaluate the utility of DMS-tandem mass spectrometry (DMS-MS/MS) as a replacement for immunoassay-based clinical toxicology testing. METHODS A sensitive DMS-MS/MS method was developed and validated for simultaneous identification of 33 drugs and metabolites in human urine samples. After DMS optimization, the method was validated and used to screen 56 clinical urine samples. These results were compared to results obtained by immunoassay. RESULTS The DMS-MS/MS method achieved limits of detection ranging from 5 to 100 ng/mL. Moreover, the total analysis time was 2 min per sample. For the method performance evaluation, DMS-MS/MS results were compared with previously obtained urine toxicology immunoassay results. DMS-MS/MS showed higher sensitivity and identified 20% more drugs in urine, which were confirmed by LC-MS/MS. CONCLUSION The DMS-MS/MS as applied in our lab demonstrated the capability for rapid drug screening and provided better analytical performance than immunoassay.
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Key Words
- 6-MAM, 6-Monoacetylmorphine
- AMPH, amphetamines/ecstasy
- BENZ, benzodiazepines
- BUPR, buprenorphine
- CE, Collision energy
- COV, compensation voltage
- CXP, collision cell exit potential
- DAPPI, atmospheric pressure photo ionization
- DART, direct analysis in real time
- DC, direct current
- DESI, desorption electrospray ionization
- DMO, DMS offse
- DMS, differential mobility separation
- DP, declustering potential
- DR, DMS resolution enhancement
- DT, DMS cell temperature
- Differential mobility separation
- Drugs of abuse
- EDDP, 2-ethylidene1,5-dimethyl-3,3-diphenylpyrrolidine
- EP, entrance potential
- FAIMS, field asymmetric waveform ion mobility spectrometry
- FSI, fiber spray ionization
- GC-MS or LC-MS, gas chromatography- or liquid chromatography-mass spectrometry
- GS1, ion source gas 1
- GS2, ion source gas 2
- IMS, ion mobility spectrometry, IS, internal standards, LOD, limit of detection, MD, modifier, MDC, modifier composition, ME, matrix effects
- MRM, multiple reaction monitoring
- MS/MS, tandem mass spectrometry
- Mass spectrometry
- OPI, opiates
- OXY, oxycodone/oxmorphone
- QCs, quality controls
- SRM, selected reaction monitoring
- SV, separation voltage
- Urine drug screening
- WT-ESI, wooden-tip electrospray ionization
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Affiliation(s)
- Shirin Hooshfar
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA, United States
- Department of Drug Metabolism and Pharmacokinetics, Eisai Inc., Cambridge, MA, United States
| | - Simone Tchu
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA, United States
| | - Cassandra Yun
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA, United States
| | - Kara L Lynch
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA, United States
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Tao XY, Zhang Y, Zhou Y, Liu ZF, Feng XS. Nicotine in Complex Samples: Recent Updates on the Pretreatment and Analysis Method. Crit Rev Anal Chem 2021; 53:1209-1238. [PMID: 34955065 DOI: 10.1080/10408347.2021.2016365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
Nicotine is a significant evaluation index of tobacco and its related products' quality, but nicotine overdose can pose serious health hazards and cause addiction and dependence, thus it can be seen that it is necessary to find suitable and efficient detection methods to precisely detect nicotine in diverse samples and complex matrices. In this review, an updated summary of the latest trends in pretreatment and analytical techniques for nicotine is provided. We reviewed various sample pretreatment methods, such as solid phase extraction, solid phase microextraction, liquid phase microextraction, QuEChERS, etc., and diverse nicotine assay methods including liquid chromatography, gas chromatography, electrochemical sensors, etc., focusing on the developments since 2015. Furthermore, the recent progress in the applications and applicability of these techniques as well as our prospects for future developments are discussed.HighlightsUpdated pretreatment and analysis methods of nicotine were systematically summarized.Microextraction and automation were main development trends of nicotine pretreatment.The introduction of novel materials added luster to nicotine pretreatment.The evolutions of ion source and mass analyzer were emphasized.
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Affiliation(s)
- Xin-Yue Tao
- School of Pharmacy, China Medical University, Shenyang, China
- Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Yuan Zhang
- School of Pharmacy, China Medical University, Shenyang, China
| | - Yu Zhou
- Department of Pharmacy, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Zhi-Fei Liu
- School of Pharmacy, China Medical University, Shenyang, China
| | - Xue-Song Feng
- School of Pharmacy, China Medical University, Shenyang, China
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Forbes TP, Krauss ST. Confined DART-MS for Rapid Chemical Analysis of Electronic Cigarette Aerosols and Spiked Drugs. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:2274-2280. [PMID: 34184882 PMCID: PMC9969341 DOI: 10.1021/jasms.1c00103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A confined direct analysis in a real time mass spectrometry (DART-MS) system and method were developed for coupling directly with commercial electronic cigarettes for rapid analysis without sample preparation. The system consisted of a confining heated glass T-junction, DART ionization source, and Vapur interface to assist aerodynamic transport. Suction generated by positioning the electronic cigarette at the junction inlet allowed for direct chemical analysis of aerosolized electronic liquids from both automatic devices powered by drag and manual button-operated devices, which is unachievable with traditional DART-MS. Parametric analyses for the system investigated Vapur suction flow rate, junction heating, puff duration, and coil power levels. Using this method, rapid chemical analyses of electronic cigarette aerosols from electronic liquids, spiked illicit drugs, and polymeric or plasticizer contaminants were performed in <30 s. The confined DART-MS method provides a streamlined tool for rapid screening of illicit and hazardous chemical profiles emitting from electronic cigarettes.
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Affiliation(s)
- Thomas P. Forbes
- National Institute of Standards and Technology, Materials Measurement Science Division, Gaithersburg, MD 20899, USA
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Taylor A, Dunn K, Turfus S. A review of nicotine-containing electronic cigarettes-Trends in use, effects, contents, labelling accuracy and detection methods. Drug Test Anal 2021; 13:242-260. [PMID: 33450135 DOI: 10.1002/dta.2998] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2020] [Revised: 01/06/2021] [Accepted: 01/07/2021] [Indexed: 12/15/2022]
Abstract
Electronic cigarettes (ECs) are thought to be less harmful than traditional combustible cigarettes and were originally intended to help smokers quit. Over the past two decades, they have especially gained popularity with the younger generation. To date, there are over 7000 unique e-liquid flavours available and over 400 different e-cigarette brands. The accuracy of nicotine strength labelling in e-liquids was assessed in this work. Twenty-three studies from around the world were chosen to assess the level and frequency of nicotine mislabelling in 545 e-liquid products. Nicotine strengths were most commonly mislabelled by between 5% and 20%, with the majority testing lower than what the label indicated. Fifteen European e-liquids that were assessed were labelled as 20 mg/ml or less, yet when tested, they contained more than 20 mg/ml of nicotine. One e-liquid that was supposed to contain no nicotine in fact contained 23.91 mg/ml of nicotine. Furthermore, the difference between the medians of the available labelled and experimental nicotine concentrations was significant (p < 0.001, Wilcoxon signed rank test). Preliminary studies show that high nicotine levels delivered via aerosol increase the risk for nicotine poisoning and cause airway inflammation. Other EC ingredients, such as flavourings, contribute to EVALI and 'popcorn lung'. There is evidence that certain flavourings, such as menthol, reinforce the effects of nicotine and modify drug absorption and metabolism. There is a global need for better quality control in EC products in order to make these safe for consumers.
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Affiliation(s)
- Amelia Taylor
- School of Applied Sciences, University of Huddersfield, Huddersfield, UK
| | - Keeley Dunn
- School of Applied Sciences, University of Huddersfield, Huddersfield, UK
| | - Sophie Turfus
- School of Applied Sciences, University of Huddersfield, Huddersfield, UK
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Yang P, Li X, Yang W, He L, Yang L, Zhang X. A simple liquid chromatography/differential ion mobility spectrometry tandem mass spectrometry method for the determination of trimethylamine-N-oxide in human serum: An application in dialysis patients. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2021; 35:e8965. [PMID: 33002250 DOI: 10.1002/rcm.8965] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 06/11/2023]
Abstract
RATIONALE Trimethylamine-N-oxide (TMAO) is a potential indicator of cardiovascular disease and chronic kidney disorders. It is important to monitor the TMAO level in plasma or serum of hemodialysis patients. A simple liquid chromatography/differential ion mobility spectrometry tandem mass spectrometry (HPLC/DMS-MS/MS) method was established and validated for the determination of TMAO in the serum of hemodialysis patients. METHODS Chromatographic separation was performed on a Waters Atlantis HILIC silica column (2.1 × 50 mm, 3 μm). The gradient mobile phase consisted of 10 mM ammonium formate buffer and acetonitrile with 0.1% formic acid in both solvents. The serum sample was precipitated with acidic acetonitrile prior to HPLC/DMS-MS/MS analysis and TMAO-d9 was used as the internal standard. Data acquisition was performed in positive ion mode with a DMS system before the electrospray ionization source. The selected reaction monitoring transitions were m/z 76.0 → 58.0 and m/z 85.2 → 66.1 for TMAO and the internal standard, respectively. RESULTS Excellent linearity was observed over the calibration range 0.05-20 μg/mL (r2 > 0.995). The method was validated for good specificity and sensitivity. The inter-run and intra-run precision and accuracy were less than 13.6% and 10.7%, respectively. CONCLUSIONS We established a novel and robust HPLC/DMS-MS/MS method for the quantification of TMAO in human serum samples. The validated assay was simple, rapid, sensitive and reliable. The developed method could be applied to the assay of serum samples from patients with kidney disease who are undergoing hemodialysis.
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Affiliation(s)
- Ping Yang
- Department of Pharmacy, Peking University Third Hospital, Beijing, 100191, China
| | - Xiaona Li
- Department of Pharmacy, Peking University Third Hospital, Beijing, 100191, China
| | - Wenling Yang
- Department of Nephrology, Peking University Third Hospital, Beijing, 100191, China
| | - Lian He
- Department of Nephrology, Peking University Third Hospital, Beijing, 100191, China
| | - Li Yang
- Department of Pharmacy, Peking University Third Hospital, Beijing, 100191, China
| | - Xianhua Zhang
- Department of Pharmacy, Peking University Third Hospital, Beijing, 100191, China
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Bijlsma L, Bade R, Been F, Celma A, Castiglioni S. Perspectives and challenges associated with the determination of new psychoactive substances in urine and wastewater - A tutorial. Anal Chim Acta 2020; 1145:132-147. [PMID: 33453874 DOI: 10.1016/j.aca.2020.08.058] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 08/26/2020] [Accepted: 08/28/2020] [Indexed: 11/16/2022]
Abstract
New psychoactive substances (NPS), often designed as (legal) substitutes to conventional illicit drugs, are constantly emerging in the drug market and being commercialized in different ways and forms. Their use continues to cause public health problems and is therefore of major concern in many countries. Monitoring NPS use, however, is arduous and different sources of information are required to get more insight of the prevalence and diffusion of NPS use. The determination of NPS in pooled urine and wastewater has shown great potential, adding a different and complementary light on this issue. However, it also presents analytical challenges and limitations that must be taken into account such as the complexity of the matrices, the high sensitivity and selectivity required in the analytical methods as a consequence of the low analyte concentrations as well as the rapid transience of NPS on the drug market creating a scenario with constantly moving analytical targets. Analytical investigation of NPS in pooled urine and wastewater is based on liquid chromatography hyphenated to mass spectrometry and can follow different strategies: target, suspect and non-target analysis. This work aims to discuss the advantages and disadvantages of the different data acquisition workflows and data exploration approaches in mass spectrometry, but also pays attention to new developments such as ion mobility and the use of in-silico prediction tools to improve the identification capabilities in high-complex samples. This tutorial gives an insight into this emerging topic of current concern, and describes the experience gathered within different collaborations and projects supported by key research articles and illustrative practical examples.
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Affiliation(s)
- L Bijlsma
- Environmental and Public Health Analytical Chemistry, Research Institute for Pesticides and Water, University Jaume I, 12071, Castellón, Spain.
| | - R Bade
- University of South Australia, UniSA: Clinical and Health Sciences, Health and Biomedical Innovation, South Australia, 5000, Australia.
| | - F Been
- KWR Water Research Institute, Chemical Water Quality and Health, 3430 BB, Nieuwegein, the Netherlands
| | - A Celma
- Environmental and Public Health Analytical Chemistry, Research Institute for Pesticides and Water, University Jaume I, 12071, Castellón, Spain
| | - S Castiglioni
- Istituto di Ricerche Farmacologiche Mario Negri - IRCCS, Department of Environmental Health Sciences, 20156, Milan, Italy
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Xiao Y, Chen S, Zhang G, Li Z, Xiao H, Chen C, He C, Zhang R, Yang X. Simple and rapid nicotine analysis using a disposable silica nanochannel-assisted electrochemiluminescence sensor. Analyst 2020; 145:4806-4814. [PMID: 32588848 DOI: 10.1039/d0an00588f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Nicotine analysis is essential to medicine, toxicology and the tobacco industry. However, no simple, portable and disposable method was developed to meet their demands. Here, we report a simple, rapid and disposable silica nanochannel (SAN)-based electrochemiluminescence (ECL) sensor for nicotine analysis by simply assembling a SAN electrode with a paper cover. The sensing principle of the disposable sensor is based on the size exclusion effect and charge selectivity, which obviously prolong the sensor service time. We find that the sensor exhibits good specificity to nicotine, and most of the complex matrices are unlikely to impact the detection. The performance of the disposable sensor in cigarettes, e-cigarettes, nicotine gums, and lozenges is fully validated, showing satisfactory linearity, sensitivity (a limit of detection of 27.82 nM), and accuracy (a recovery between 96.00% and 106.51%). The disposable sensor can be potentially applied for on-site nicotine analysis.
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Affiliation(s)
- Yi Xiao
- Key Laboratory of Study and Discovery of Small Targeted Molecules of Hunan Province, Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha 410013, Hunan, China. and Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Hunan Normal University), Ministry of Education, China
| | - Suhua Chen
- Key Laboratory of Study and Discovery of Small Targeted Molecules of Hunan Province, Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha 410013, Hunan, China. and Hunan Provincial Maternal and Child Health Care Hospital, Changsha 410008, Hunan, China
| | - Guocan Zhang
- Key Laboratory of Study and Discovery of Small Targeted Molecules of Hunan Province, Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha 410013, Hunan, China.
| | - Zhimao Li
- Key Laboratory of Study and Discovery of Small Targeted Molecules of Hunan Province, Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha 410013, Hunan, China.
| | - Han Xiao
- Key Laboratory of Study and Discovery of Small Targeted Molecules of Hunan Province, Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha 410013, Hunan, China.
| | - Chuanpin Chen
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410013, China
| | - Chunlian He
- Key Laboratory of Study and Discovery of Small Targeted Molecules of Hunan Province, Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha 410013, Hunan, China.
| | - Ran Zhang
- Key Laboratory of Study and Discovery of Small Targeted Molecules of Hunan Province, Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha 410013, Hunan, China.
| | - Xiaoping Yang
- Key Laboratory of Study and Discovery of Small Targeted Molecules of Hunan Province, Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha 410013, Hunan, China.
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Reilly SM, Cheng T, DuMond J. Method Validation Approaches for Analysis of Constituents in ENDS. TOB REGUL SCI 2020; 6:242-265. [PMID: 32789155 PMCID: PMC7416875 DOI: 10.18001/trs.6.4.3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE We assessed how many peer-reviewed publications reporting chemical quantities and/or yields from electronic nicotine delivery systems (ENDS) have included adequate method validation characteristics in the publication for appropriate interpretation of data quality for informing tobacco regulatory science. METHODS We searched 5 databases (Web of Knowledge, PubMed, SciFinder, Embase, EBSCOhost) for ENDS publications between January 2007 and September 2018. Of the 283 publications screened, 173 publications were relevant for analysis. We identified the publications that report a certain degree of control in data quality, ie, the publications that report marginally validated methods (MVMs). MVMs refer to the methods that: (1) report 3 or more International Conference on Harmonisation (ICH) method validation characteristics, (2) state the method was validated, (3) cite their own previous publication(s) that report MVMs, or (4) use a method within the accreditation scope of an accredited laboratory. RESULTS Overall, 97 publications (56%) report MVMs in their studies. This percentage also reflects the publication distribution for the majority of the 28 chemicals measured by MVMs. CONCLUSIONS This study highlights the need for reporting sufficient validation characteristics following appropriate guidance to ensure the accuracy and reliability of the published analytical data for proper data interpretations that may support policy.
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Affiliation(s)
- Samantha M Reilly
- Office of Science, Center for Tobacco Products, Food and Drug Administration, Silver Spring, MD
| | - Tianrong Cheng
- Office of Science, Center for Tobacco Products, Food and Drug Administration, Silver Spring, MD
| | - Jenna DuMond
- Office of Science, Center for Tobacco Products, Food and Drug Administration, Silver Spring, MD
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Barrington-Trimis JL, Yang Z, Schiff S, Unger J, Cruz TB, Urman R, Cho J, Samet JM, Leventhal AM, Berhane K, McConnell R. E-cigarette Product Characteristics and Subsequent Frequency of Cigarette Smoking. Pediatrics 2020; 145:peds.2019-1652. [PMID: 32253264 PMCID: PMC7193941 DOI: 10.1542/peds.2019-1652] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/19/2020] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND There is a dearth of evidence regarding the association of use of electronic cigarettes (e-cigarettes) with certain product characteristics and adolescent and young adult risk of unhealthy tobacco use patterns (eg, frequency of combustible cigarette smoking), which is needed to inform the regulation of e-cigarettes. METHODS Data were collected via an online survey of participants in the Southern California Children's Health Study from 2015 to 2016 (baseline) and 2016 to 2017 (follow-up) (N = 1312). We evaluated the association of binary categories of 3 nonmutually exclusive characteristics of the e-cigarette used most frequently with the number of cigarettes smoked in the past 30 days at 1-year follow-up. Product characteristics included device (vape pen and/or modifiable electronic cigarette [mod]), use of nicotine in electronic liquid (e-liquid; yes or no), and use for dripping (directly dripping e-liquid onto the device; yes or no). RESULTS Relative to never e-cigarette users, past-30-day e-cigarette use was associated with greater frequency of past-30-day cigarette smoking at follow-up. Among baseline past-30-day e-cigarette users, participants who used mods (versus vape pens) smoked >6 times as many cigarettes at follow-up (mean: 20.8 vs 1.3 cigarettes; rate ratio = 6.33; 95% confidence interval: 1.64-24.5) after adjustment for sociodemographic characteristics, baseline frequency of cigarette smoking, and number of days of e-cigarette use. After adjustment for device, neither nicotine e-liquid nor dripping were associated with frequency of cigarette smoking. CONCLUSIONS Baseline mod users (versus vape pen users) smoked more cigarettes in the past 30 days at follow-up. Regulation of e-cigarette device type warrants consideration as a strategy to reduce cigarette smoking among adolescents and young adults who vape.
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Affiliation(s)
- Jessica L. Barrington-Trimis
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California; and
| | - Zhi Yang
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California; and
| | - Sara Schiff
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California; and
| | - Jennifer Unger
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California; and
| | - Tess Boley Cruz
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California; and
| | - Robert Urman
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California; and
| | - Junhan Cho
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California; and
| | - Jonathan M. Samet
- Colorado School of Public Health, University of Colorado, Aurora, Colorado
| | - Adam M. Leventhal
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California; and
| | - Kiros Berhane
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California; and
| | - Rob McConnell
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California; and
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Wu R, Chen X, Wu WJ, Wang Z, Wong YLE, Hung YLW, Wong HT, Yang M, Zhang F, Chan TWD. Rapid Differentiation of Asian and American Ginseng by Differential Ion Mobility Spectrometry-Tandem Mass Spectrometry Using Stepwise Modulation of Gas Modifier Concentration. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:2212-2221. [PMID: 31502223 DOI: 10.1007/s13361-019-02317-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 07/21/2019] [Accepted: 08/10/2019] [Indexed: 06/10/2023]
Abstract
This study reports a rapid and robust method for the differentiation of Asian and American ginseng samples based on differential ion mobility spectrometry-tandem mass spectrometry (DMS-MS/MS). Groups of bioactive ginsenoside/pseudo-ginsenoside isomers, including Rf/Rg1/F11, Rb2/Rb3/Rc, and Rd/Re, in the ginseng extracts were sequentially separated using DMS with stepwise changes in the gas modifier concentration prior to MS analysis. The identities of the spatially separated ginsenoside/pseudo-ginsenoside isomers were confirmed by their characteristic compensation voltages at specific modifier loading and MS/MS product ions. As expected, Asian ginseng samples contained some Rf and an insignificant amount of F11, whereas American ginseng samples had a high level of F11 but no Rf. The origin of the whole and sliced ginseng could further be confirmed using the quantitative ratios of three sets of ginsenoside markers, namely, Rg1/Re, Rb1/Rg1, and Rb2/Rc. Based on our results, new benchmark ratios of Rg1/Re < 0.15, Rb1/Rg1 > 2.15, and Rb2/Rc < 0.26 were proposed for American ginseng (as opposed to Asian ginseng).
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Affiliation(s)
- Ri Wu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, People's Republic of China
| | - Xiangfeng Chen
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, People's Republic of China.
- Shandong Analysis and Test Centre, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, People's Republic of China.
| | - Wei-Jing Wu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, People's Republic of China
| | - Ze Wang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, People's Republic of China
| | - Y-L Elaine Wong
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, People's Republic of China
| | - Y-L Winnie Hung
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, People's Republic of China
| | - H-T Wong
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, People's Republic of China
| | - Minli Yang
- Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Beijing, 100123, China
| | - Feng Zhang
- Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Beijing, 100123, China
| | - T-W Dominic Chan
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, People's Republic of China.
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Chung SWC, Lam CH. Development of an Analytical Method for Analyzing Pyrrolizidine Alkaloids in Different Groups of Food by UPLC-MS/MS. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:3009-3018. [PMID: 29485280 DOI: 10.1021/acs.jafc.7b06118] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Suspected nontargeted pyrrolizidine alkaloids (PAs), without analytical reference standard, were observed and interfered with the determination of targeted PAs in complex food matrices, especially for spices samples. Selectivity and applicability of multiple reaction monitoring (MRM) transitions, multistage fragmentation (MS3), and MRM with differential ion mobility spectrometry (DMS) for eliminating false positive identifications were evaluated. Afterward, a selective and sensitive LC-MS/MS method for the determination of 15 PAs and 13 PA N-oxides in foodstuffs was developed. The sample preparation and cleanup are applicable to a wide range of foodstuffs, including cereal products, dairy products, meat, eggs, honey, tea infusion, and spices. Freezing-out of the raw extract and the water/acetonitrile washing steps in a solid phase extraction was found to efficiently remove complex matrices. The method was validated at 0.05 μg kg-1 for general food and 0.5 μg kg-1 for spices, with reference to the Eurachem Guide. The estimated limit of quantifications of different PAs was in the range of 0.010-0.087 μg kg-1 for general food and 0.04-0.76 μg kg-1 for spices. Isotopically labeled PAs were used as internal standards to correct the variation of PAs/PANs performance in different food commodities. Matrix effects observed in complex food matrices could be reduced by solvent dilution. Recoveries of PAs and PA N-oxides were all seen within 50-120%.
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Affiliation(s)
- Stephen W C Chung
- Food Research Laboratory , Centre for Food Safety, Food and Environmental Hygiene Department , 4/F Public Health Laboratory Centre, 382 Nam Cheong Street , Hong Kong
| | - Chi-Ho Lam
- Food Research Laboratory , Centre for Food Safety, Food and Environmental Hygiene Department , 4/F Public Health Laboratory Centre, 382 Nam Cheong Street , Hong Kong
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14
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Separation and simultaneous quantitation of PGF2 α and its epimer 8- iso-PGF2 α using modifier-assisted differential mobility spectrometry tandem mass spectrometry. Acta Pharm Sin B 2018; 8:228-234. [PMID: 29719783 PMCID: PMC5925447 DOI: 10.1016/j.apsb.2018.01.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 12/21/2017] [Accepted: 01/15/2018] [Indexed: 02/05/2023] Open
Abstract
Because many therapeutic agents are contaminated by epimeric impurities or form epimers as a result of metabolism, analytical tools capable of determining epimers are increasingly in demand. This article is a proof-of-principle report of a novel DMS-MS/MS method to separate and simultaneously quantify epimers, taking PGF2α and its 8-epimer, 8-iso-PGF2α, as an example. Good accuracy and precision were achieved in the range of 10-500 ng/mL with a run time of only 1.5 min. Isopropanol as organic modifier facilitated a good combination of sensitivity and separation. The method is the first example of the quantitation of epimers without chromatographic separation.
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15
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DeVito EE, Krishnan-Sarin S. E-cigarettes: Impact of E-Liquid Components and Device Characteristics on Nicotine Exposure. Curr Neuropharmacol 2018; 16:438-459. [PMID: 29046158 PMCID: PMC6018193 DOI: 10.2174/1570159x15666171016164430] [Citation(s) in RCA: 158] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 08/09/2017] [Accepted: 10/13/2017] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Electronic cigarette (e-cigarette) use has increased substantially in recent years. While e-cigarettes have been proposed as a potentially effective smoking cessation tool, dualuse in smokers is common and e-cigarettes are widely used by non-smokers, including youth and young-adult non-smokers. Nicotine, the primary addictive component in cigarettes, is present at varying levels in many e-liquids. E-cigarettes may lead to initiation of nicotine use in adult and youth non-smokers, re-initiation of nicotine dependence in ex-smokers or increased severity of nicotine dependence in dual-users of cigarettes and e-cigarettes. As such, there are important clinical and policy implications to understanding factors impacting nicotine exposure from e-cigarettes. However, the broad and rapidly changing range of e-liquid constituents and e-cigarette hardware which could impact nicotine exposure presents a challenge. Recent changes in regulatory oversight of e-cigarettes underscore the importance of synthesizing current knowledge on common factors which may impact nicotine exposure. METHODS This review focuses on factors which may impact nicotine exposure by changing e-cigarette use behavior, puff topography, altering the nicotine yield (amount of nicotine exiting the e-cigarette mouth piece including nicotine exhaled as vapor) or more directly by altering nicotine absorption and bioavailability. RESULTS Topics reviewed include e-liquid components or characteristics including flavor additives (e.g., menthol), base e-liquid ingredients (propylene glycol, vegetable glycerin), components commonly used to dissolve flavorants (e.g., ethanol), and resulting properties of the e-liquid (e.g., pH), e-cigarette device characteristics (e.g., wattage, temperature, model) and user behavior (e.g., puff topography) which may impact nicotine exposure. CONCLUSION E-liquid characteristics and components, e-cigarette hardware and settings, and user behavior can all contribute substantially to nicotine exposure from e-cigarettes.
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Affiliation(s)
- Elise E. DeVito
- Yale University School of Medicine, Department of Psychiatry, New Haven, CT, USA
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Regueiro J, Negreira N, Carreira-Casais A, Pérez-Lamela C, Simal-Gándara J. Dietary exposure and neurotoxicity of the environmental free and bound toxin β- N -methylamino- l -alanine. Food Res Int 2017; 100:1-13. [DOI: 10.1016/j.foodres.2017.07.033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 07/14/2017] [Accepted: 07/16/2017] [Indexed: 10/19/2022]
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17
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Regueiro J, Negreira N, Hannisdal R, Berntssen MH. Targeted approach for qualitative screening of pesticides in salmon feed by liquid chromatography coupled to traveling-wave ion mobility/quadrupole time-of-flight mass spectrometry. Food Control 2017. [DOI: 10.1016/j.foodcont.2017.02.053] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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18
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Boschmans J, Lemière F, Sobott F. Analyzing complex mixtures of drug-like molecules: Ion mobility as an adjunct to existing liquid chromatography-(tandem) mass spectrometry methods. J Chromatogr A 2017; 1490:80-88. [DOI: 10.1016/j.chroma.2017.02.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 01/24/2017] [Accepted: 02/09/2017] [Indexed: 12/17/2022]
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19
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Glasser AM, Collins L, Pearson JL, Abudayyeh H, Niaura RS, Abrams DB, Villanti AC. Overview of Electronic Nicotine Delivery Systems: A Systematic Review. Am J Prev Med 2017; 52:e33-e66. [PMID: 27914771 PMCID: PMC5253272 DOI: 10.1016/j.amepre.2016.10.036] [Citation(s) in RCA: 320] [Impact Index Per Article: 45.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 10/07/2016] [Accepted: 10/26/2016] [Indexed: 12/20/2022]
Abstract
CONTEXT Rapid developments in e-cigarettes, or electronic nicotine delivery systems (ENDS), and the evolution of the overall tobacco product marketplace warrant frequent evaluation of the published literature. The purpose of this article is to report updated findings from a comprehensive review of the published scientific literature on ENDS. EVIDENCE ACQUISITION The authors conducted a systematic review of published empirical research literature on ENDS through May 31, 2016, using a detailed search strategy in the PubMed electronic database, expert review, and additional targeted searches. Included studies presented empirical findings and were coded to at least one of nine topics: (1) Product Features; (2) Health Effects; (3) Consumer Perceptions; (4) Patterns of Use; (5) Potential to Induce Dependence; (6) Smoking Cessation; (7) Marketing and Communication; (8) Sales; and (9) Policies; reviews and commentaries were excluded. Data from included studies were extracted by multiple coders (October 2015 to August 2016) into a standardized form and synthesized qualitatively by topic. EVIDENCE SYNTHESIS There were 687 articles included in this systematic review. The majority of studies assessed patterns of ENDS use and consumer perceptions of ENDS, followed by studies examining health effects of vaping and product features. CONCLUSIONS Studies indicate that ENDS are increasing in use, particularly among current smokers, pose substantially less harm to smokers than cigarettes, are being used to reduce/quit smoking, and are widely available. More longitudinal studies and controlled trials are needed to evaluate the impact of ENDS on population-level tobacco use and determine the health effects of longer-term vaping.
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Affiliation(s)
- Allison M Glasser
- The Schroeder Institute for Tobacco Research and Policy Studies at Truth Initiative, Washington, District of Columbia.
| | - Lauren Collins
- The Schroeder Institute for Tobacco Research and Policy Studies at Truth Initiative, Washington, District of Columbia
| | - Jennifer L Pearson
- The Schroeder Institute for Tobacco Research and Policy Studies at Truth Initiative, Washington, District of Columbia
| | - Haneen Abudayyeh
- The Schroeder Institute for Tobacco Research and Policy Studies at Truth Initiative, Washington, District of Columbia
| | - Raymond S Niaura
- The Schroeder Institute for Tobacco Research and Policy Studies at Truth Initiative, Washington, District of Columbia; Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland; Georgetown University Medical Center, Lombardi Comprehensive Cancer Center, Washington, District of Columbia
| | - David B Abrams
- The Schroeder Institute for Tobacco Research and Policy Studies at Truth Initiative, Washington, District of Columbia; Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland; Georgetown University Medical Center, Lombardi Comprehensive Cancer Center, Washington, District of Columbia
| | - Andrea C Villanti
- The Schroeder Institute for Tobacco Research and Policy Studies at Truth Initiative, Washington, District of Columbia; Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
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20
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Deng L, Wang R, Wang G, Liu M, Liao G, Liao Z, Chen M. Targeted isolation of sulfur-containing metabolites from Lsr2-deletion mutant strain of Streptomyces roseosporus. RSC Adv 2017. [DOI: 10.1039/c7ra06482a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
UPLC-QTOF-MS/MS targeted isolation of novel sulfur-containing metabolites, pyrismycins A–F, from a Lsr2-deletion mutant strain of Streptomyces roseosporus.
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Affiliation(s)
- Lina Deng
- College of Pharmaceutical Sciences
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- Southwest University
- Chongqing 400715
| | - Rui Wang
- College of Pharmaceutical Sciences
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- Southwest University
- Chongqing 400715
| | - Guowei Wang
- College of Pharmaceutical Sciences
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- Southwest University
- Chongqing 400715
| | - Mingxu Liu
- College of Pharmaceutical Sciences
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- Southwest University
- Chongqing 400715
| | - Guojian Liao
- College of Pharmaceutical Sciences
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- Southwest University
- Chongqing 400715
| | - Zhihua Liao
- School of Life Sciences
- Southwest University
- Chongqing 400715
- P. R. China
| | - Min Chen
- College of Pharmaceutical Sciences
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- Southwest University
- Chongqing 400715
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21
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Regueiro J, Negreira N, Berntssen MHG. Ion-Mobility-Derived Collision Cross Section as an Additional Identification Point for Multiresidue Screening of Pesticides in Fish Feed. Anal Chem 2016; 88:11169-11177. [PMID: 27779869 DOI: 10.1021/acs.analchem.6b03381] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Ion mobility spectrometry allows for the measurement of the collision cross section (CCS), which provides information about the shape of an ionic molecule in the gas phase. Although the hyphenation of traveling-wave ion mobility spectrometry (TWIMS) with high-resolution quadrupole time-of-flight mass spectrometry (QTOFMS) has been mainly used for structural elucidation purposes, its potential for fast screening of small molecules in complex samples has not yet been thoroughly evaluated. The current work explores the capabilities of ultrahigh-performance liquid chromatography (UHPLC) coupled to a new design TWIMS-QTOFMS for the screening and identification of a large set of pesticides in complex salmon feed matrices. A database containing TWIMS-derived CCS values for more than 200 pesticides is hereby presented. CCS measurements showed high intra- and interday repeatability (RSD < 1%), and they were not affected by the complexity of the investigated matrices (ΔCCS ≤ 1.8%). The use of TWIMS in combination with QTOFMS was demonstrated to provide an extra-dimension, which resulted in increased peak capacity and selectivity in real samples. Thus, many false-positive detections could be straightforwardly discarded just by applying a maximum ΔCCS tolerance of ±2%. CCS was proposed as a valuable additional identification point in the pesticides screening workflow. Several commercial fish feed samples were finally analyzed to demonstrate the applicability of the proposed approach. Ethoxyquin and pirimiphos-methyl were identified in most of the analyzed samples, whereas tebuconazole and piperonil butoxide were identified for the first time in fish feed samples.
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Affiliation(s)
- Jorge Regueiro
- National Institute of Nutrition and Seafood Research (NIFES), P.O. Box 2029 Nordnes, N-5817 Bergen, Norway
| | - Noelia Negreira
- National Institute of Nutrition and Seafood Research (NIFES), P.O. Box 2029 Nordnes, N-5817 Bergen, Norway
| | - Marc H G Berntssen
- National Institute of Nutrition and Seafood Research (NIFES), P.O. Box 2029 Nordnes, N-5817 Bergen, Norway
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