European Journal of Mass Spectrometry最新文献

{"title":"Guest Editorial: Two Decades of LIFDI: Pedigree and Capabilities.","authors":"H Bernhard Linden","doi":"10.1177/14690667221146486","DOIUrl":"https://doi.org/10.1177/14690667221146486","url":null,"abstract":"Liquid Injection Field Desorption Ionization (LIFDI) Mass Spectrometry (MS) became increasingly attractive to catalytic, inorganic, and organometallic chemists publishing more than 500 papers with LIFDI data during the last years. The extremely soft ionization of neutral compounds, the compatibility with non-polar solvents like toluene or hexane and last but not least the quick and convenient protocol under anaerobic conditions made LIFDI MS the method of choice for reactive compounds sensitive to air and/or moisture. The softness of the ionization is due to the fact that LIFDI is one of three Field Ionization (FI) methods which remove the weakest bound electron from neutral molecules literally without transferring excess energy to the hence stable radical ions. FI-MS was introduced by Inghram and Gomer in 1955 as the first of these methods (DOI: 10.1021/ja01607a096). FI mass spectra of hydrocarbons were essentially free of fragment ion peaks as opposed to Electron Ionization (EI) spectra. This made FI become a standard ionization method in the petrochemical industry. FI and EI have in common that only gases and vapours of compounds can be ionized. Therefore, the term FI-MS was soon associated with soft ionization mass spectrometry for the analysis of gases and volatile compounds. Field Desorption (FD) was introduced in 1969 by my venerated teacher Hans Dieter Beckey (DOI: 10.1016/ 0020-7381(69)80047-1). Using FI, he observed raising signal intensities along with the aging of the emitter wire. The notable increase in ionization efficiency was found to be correlated with the growth of tiny graphite whiskers via decomposition of acetone vapour on the hot surface of the wire. This process during tuning of the ion source raised the local field strength this strongly that up to 100 times more intensive signals appeared. When Beckey dipped a solution of D-Glucose onto an aged, i.e., “high sensitivity” wire, reinstalled the source flange, pumped down, and acquired the first FD spectra, he obtained the [M+H] ion signal as the base peak while fragment ion intensities remained at a negligible level. Thus, according to the title of the first FD paper, FD became the first ionization method for “the study of thermally unstable substances of low volatility”. LIFDI was introduced here in EJMS in 2004 (DOI: 10.1255/ejms.655). LIFDI outperforms FD by its convenient sample supply to the emitter right inside the ion source through a fused silica capillary without breaking the vacuum. LIFDI enabled a fully anaerobic protocol with the capillary aspirating sample solution under the inert headspace of a septum capped vial or directly out of the glove box (DOI: 10.1021/jacsau.1c00117). In conclusion, LIFDI, FD, and FI share the soft ionization of neutral molecules by “removal of electrons from any species by interaction with a high electrical field” (according to UPAC 1997). They differ in the way the samples are supplied to the emitter: in FI via the gas phase, in FD f","PeriodicalId":12007,"journal":{"name":"European Journal of Mass Spectrometry","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9346169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editorial.","authors":"Jürgen Grotemeyer","doi":"10.1177/14690667221148578","DOIUrl":"https://doi.org/10.1177/14690667221148578","url":null,"abstract":"","PeriodicalId":12007,"journal":{"name":"European Journal of Mass Spectrometry","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9346025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unprecedented intact radical anions, closed shell anions, cluster ions, and traditional cations and radical cations by LIFDI-MS.","authors":"Mathias H Linden,&nbsp;H Bernhard Linden","doi":"10.1177/14690667221146079","DOIUrl":"https://doi.org/10.1177/14690667221146079","url":null,"abstract":"<p><p>Liquid injection field desorption ionization (LIFDI) proves the extraordinary softness of the ionization process combined with a convenient sample supply under the exclusion of moisture and air. LIFDI-mass spectrometry (MS) is used for organometallic and other seriously air-sensitive compounds forming intact ions without substantial fragmentation. Unprecedented molecular radical anions M^-• are presented along with well-known intact M^+• radical cations. Furthermore closed shell cations [C]⁺ and adduct ions like [M + H]⁺ or [M + Alkali]⁺ are gently transferred from the solid emitter surface into the gas phase. Anions [A]^- or [M - H]^- are accessible by LIFDI-MS at medium field strengths. Ion pairs [C]⁺[A]^- are separately detected by positive and negative mode LIFDI-MS, respectively. Here we give an overview of the different ion types accessible by LIFDI-MS. For the first time the field ionization/desorption of solar cell electron acceptor compounds is shown to deliver M<b>^-</b>^• and M<b>^2-</b>^• radical ions.</p>","PeriodicalId":12007,"journal":{"name":"European Journal of Mass Spectrometry","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9351405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification and characterization of selected silyl substituted silyl anions by liquid injection field desorption ionization mass spectrometry.","authors":"Thomas Lainer,&nbsp;Roland C Fischer,&nbsp;Michael Haas","doi":"10.1177/14690667221139720","DOIUrl":"https://doi.org/10.1177/14690667221139720","url":null,"abstract":"<p><p>Silyl anions are crucial building blocks in silicon chemistry and are frequently used in organosilicon chemistry. These so-called silanides are negatively charged three-coordinate species, isoelectronic to carbanions. In this contribution, we synthesized already literature known and unknown anionic silicon species. Here we focused on silyl substituted silyl anions with different substituted silicon atoms like hydrogen, methyl, and methoxy groups. Furthermore, we investigated these species with liquid injection field desorption ionization mass spectrometry.</p>","PeriodicalId":12007,"journal":{"name":"European Journal of Mass Spectrometry","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9701317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Positive + negative is not equal to zero: Use of negative ionisation as analyte identity confirmation tool in LC-ESI-MS analysis.","authors":"Ernesto Zapata,&nbsp;Ivo Leito,&nbsp;Koit Herodes","doi":"10.1177/14690667221130160","DOIUrl":"https://doi.org/10.1177/14690667221130160","url":null,"abstract":"<p><p>In this study the use of negative electrospray ionisation mode as a confirmation tool for identifying derivatized amino acids using LC-ESI-MS, was evaluated. The derivatization reagent was based on azobenzene N-hydroxysuccinimide carbamate. The results indicate that even though negative ionisation mode produced less intense peaks, the ratio of peak area of quantifier ion (obtained in positive mode) to the qualifier (or identifier) ion measured in negative mode meets the requirements established by two prominent validation guidelines: SANTE/11312/2021 and 2002/657/EC. Therefore, the use of product ions obtained via negative transitions as qualifier ions, while using product ions from positive transitions as quantifier ions is a fruitful approach that widens the choice of transitions to choose from for obtaining suitable qualifier ions. This methodology was applied to the LC-ESI-MS/MS determination of amino acids in different beverages (tomato juice, watermelon juice, kvass).</p>","PeriodicalId":12007,"journal":{"name":"European Journal of Mass Spectrometry","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33490163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gas Chromatography - Ion Mobility Spectrometry as a tool for quick detection of hazardous volatile organic compounds in indoor and ambient air: A university campus case study.","authors":"Pedro Catalão Moura,&nbsp;Valentina Vassilenko","doi":"10.1177/14690667221130170","DOIUrl":"https://doi.org/10.1177/14690667221130170","url":null,"abstract":"<p><p>Society's concerns about the citizens<b>'</b> exposure to possibly dangerous environments have recently risen; nevertheless, the assessment of indoor air quality still represents a major contemporary challenge. The volatile organic compounds (VOCs) are among the main factors responsible for deteriorating air quality conditions. These analytes are very common in daily-use environments and they can be extremely hazardous to human health, even at trace concentrations levels. For these reasons, their quick detection, identification, and quantification are crucial tasks, especially for indoor and heavily-populated scenarios, where the exposure time is usually quite long. In this work, a Gas Chromatography - Ion Mobility Spectrometry (GC-IMS) device was used for continuous monitoring indoor and ambient air environments at a large-scale, due to its outstanding levels of sensibility, selectivity, analytical flexibility, and almost real-time monitoring capability. A total of 496 spectra were collected from 15 locations of a university campus and posteriorly analysed. Overall, 23 compounds were identified among the 31 detected. Some of them, like Ethanol and 2-Propanol, were reported as being very hazardous to the human organism, especially in indoor environments. The achieved results confirmed the suitability of GC-IMS technology for air quality assessment and monitoring of VOCs and, more importantly, proved how dangerous indoor environments can be in scenarios of continuous exposure.</p>","PeriodicalId":12007,"journal":{"name":"European Journal of Mass Spectrometry","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9647320/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33489775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mass-spectrometric studies of kinetic characteristics of codeine molecule thermodesorption by non-stationary surface ionization method.","authors":"G T Rakhmanov,&nbsp;D T Usmanov","doi":"10.1177/14690667221136069","DOIUrl":"https://doi.org/10.1177/14690667221136069","url":null,"abstract":"<p><p>The adsorption and surface ionization of codeine molecules С₁₈H₂₁O₃N (<i>m/z</i> 299) on the surface of oxidized tungsten have been studied by a non-stationary method of voltage modulation under the same experimental conditions with a high-vacuum mass-spectrometric setup using a \"black chamber\" all walls of which are cooled with liquid nitrogen. For the codeine molecule dissociation with the <math><mo>(</mo><mrow><mrow><mi>C</mi></mrow><mo>-</mo><msub><mrow><mi>C</mi></mrow><mn>1</mn></msub></mrow><msub><mo>)</mo><mrow><mi>β</mi></mrow></msub></math> bond breaking and formation of ionizable radicals, the rate constants <i>K</i>⁺ and <i>K</i>⁰, the activation energy <i>Е</i>⁺ and <i>Е</i>⁰ of thermodesorption, and the pre-exponential factors in the continuity equation for the radicals C₉H₇N⁺CH₃ (<i>m/z</i> 144) have been defined by surface ionization on the surface of oxidized tungsten <i>W_xO_y</i>. The results of determining the surface ionization coefficient and estimates of the ionization potentials of these radicals have been presented.</p>","PeriodicalId":12007,"journal":{"name":"European Journal of Mass Spectrometry","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40460477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bioanalytical method for estimation of procyclidine in human plasma using liquid chromatography-tandem mass spectrometry: Application to pharmacokinetic study.","authors":"Viritha Bezawada,&nbsp;Padma Mogili,&nbsp;Sireesha Dodda,&nbsp;Ramakrishna Gajula","doi":"10.1177/14690667221111153","DOIUrl":"https://doi.org/10.1177/14690667221111153","url":null,"abstract":"<p><p>A rapid, selective and sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated for quantification of procyclidine hydrochloride in human plasma using Procyclidine D11 hydrochloride as internal standard. Liquid-liquid extraction technique with methyl tertiary butyl ether was used for the extraction of plasma samples. Chromatographic separation of the analyte and the internal standard from the endogenous components was done on Zodiac C₁₈ column (50 × 4.6 mm, 5 µm) using a mixture of methanol and 0.1% formic acid in water (70:30, v/v) as mobile phase at a flow rate of 1 mL/min with the run time of 2 min. The detection of the eluents was done using multiple reaction monitoring (MRM) in positive ion mode. Linearity of the method was established in the concentration range of 0.5 to 120 ng/mL. Full validation of the method was done as per USFDA guidelines and the results were well within the acceptance limits. The successful application of the method was done on healthy human subjects under fasting conditions, proving it to be used for bioequivalence and bioavailability (BA/BE) studies of procyclidine.</p>","PeriodicalId":12007,"journal":{"name":"European Journal of Mass Spectrometry","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40470264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative evaluation and pharmacokinetic characteristics of the irreversible BTK inhibitor zanubrutinib in mouse plasma using LC-MS/MS.","authors":"Kai Cheng,&nbsp;Junsong Wei,&nbsp;Jianrong Kou,&nbsp;Huining You,&nbsp;Min Li,&nbsp;Weiyi Feng","doi":"10.1177/14690667221128934","DOIUrl":"https://doi.org/10.1177/14690667221128934","url":null,"abstract":"<p><p>Zanubrutinib (BGB-3111) belongs to the class of irreversible inhibitors of Bruton's tyrosine kinase (BTK) for treating B-cell malignancies. A validated assay with excellent sensitivity, selectivity, and simplicity is required to measure plasma concentration and investigate its pharmacokinetics. The plasma of mice containing zanubrutinib and roxithromycin (internal standard) was processed with acetonitrile for protein precipitation. Then the supernatant was analyzed by high-performance liquid chromatography coupled with a triple quadrupole mass spectrometer using electrospray ionization in the positive mode. Zanubrutinib was given to mice intragastrically at 30 mg/kg to determine its pharmacokinetic parameters. The method was verified and showed good linearity in the range of 0.1-100 ng/mL. The method's sensitivity, accuracy, and precision were all within acceptable bounds. By this method, the pharmacokinetic profile of zanubrutinib in mouse plasma was measured.</p>","PeriodicalId":12007,"journal":{"name":"European Journal of Mass Spectrometry","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33478312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differential ionization cross-section of hydrogen bromide.","authors":"Ritu Sharawat,&nbsp;Meenakshi Kumari,&nbsp;Rajeev Kumar,&nbsp;Ravinder Sharma","doi":"10.1177/14690667221129942","DOIUrl":"https://doi.org/10.1177/14690667221129942","url":null,"abstract":"<p><p>In this study, the relative single and double differential ionization cross-section of the hydrogen bromide molecule and their fragmented ions (HBr⁺, Br⁺, H⁺) have been theoretically evaluated. In the single differential ionization cross-sections, the loss of incident electron energies (W) at 100 eV, 200 eV, and 500 eV is calculated. The double differential ionization cross-section of the HBr molecule is determined for secondary electron energy (e) and different incident scattering angles (θ). The differential ionization cross-sections of the hydrogen bromide molecule were investigated for the first time.The derived results of the HBr molecule are not only important in spectrometry but may also be interesting for atmospheric sciences.</p>","PeriodicalId":12007,"journal":{"name":"European Journal of Mass Spectrometry","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40379256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}