Publisher: Elsevier   (Total: 3206 journals)

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Showing 1 - 200 of 3206 Journals sorted alphabetically
Academic Pediatrics     Hybrid Journal   (Followers: 39, SJR: 1.655, CiteScore: 2)
Academic Radiology     Hybrid Journal   (Followers: 27, SJR: 1.015, CiteScore: 2)
Accident Analysis & Prevention     Partially Free   (Followers: 106, SJR: 1.462, CiteScore: 3)
Accounting Forum     Hybrid Journal   (Followers: 28, SJR: 0.932, CiteScore: 2)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 44, SJR: 1.771, CiteScore: 3)
Achievements in the Life Sciences     Open Access   (Followers: 8)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 6)
Acta Astronautica     Hybrid Journal   (Followers: 449, SJR: 0.758, CiteScore: 2)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Biomaterialia     Hybrid Journal   (Followers: 30, SJR: 1.967, CiteScore: 7)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription   (Followers: 3)
Acta de Investigación Psicológica     Open Access   (Followers: 2)
Acta Ecologica Sinica     Open Access   (Followers: 11, SJR: 0.18, CiteScore: 1)
Acta Histochemica     Hybrid Journal   (Followers: 5, SJR: 0.661, CiteScore: 2)
Acta Materialia     Hybrid Journal   (Followers: 338, SJR: 3.263, CiteScore: 6)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.504, CiteScore: 1)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.542, CiteScore: 1)
Acta Oecologica     Hybrid Journal   (Followers: 12, SJR: 0.834, CiteScore: 2)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription  
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 2, SJR: 0.307, CiteScore: 0)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 3, SJR: 1.793, CiteScore: 6)
Acta Psychologica     Hybrid Journal   (Followers: 26, SJR: 1.331, CiteScore: 2)
Acta Sociológica     Open Access   (Followers: 1)
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.052, CiteScore: 2)
Acta Urológica Portuguesa     Open Access   (Followers: 1)
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 3, SJR: 0.374, CiteScore: 1)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 2)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 3, SJR: 0.344, CiteScore: 1)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 1)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 7, SJR: 0.19, CiteScore: 0)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 3)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 8)
Acute Pain     Full-text available via subscription   (Followers: 15, SJR: 2.671, CiteScore: 5)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.53, CiteScore: 4)
Addictive Behaviors     Hybrid Journal   (Followers: 18, SJR: 1.29, CiteScore: 3)
Addictive Behaviors Reports     Open Access   (Followers: 9, SJR: 0.755, CiteScore: 2)
Additive Manufacturing     Hybrid Journal   (Followers: 14, SJR: 2.611, CiteScore: 8)
Additives for Polymers     Full-text available via subscription   (Followers: 22)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 195, SJR: 4.09, CiteScore: 13)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 13, SJR: 1.167, CiteScore: 4)
Advanced Powder Technology     Hybrid Journal   (Followers: 17, SJR: 0.694, CiteScore: 3)
Advances in Accounting     Hybrid Journal   (Followers: 9, SJR: 0.277, CiteScore: 1)
Advances in Agronomy     Full-text available via subscription   (Followers: 20, SJR: 2.384, CiteScore: 5)
Advances in Anesthesia     Full-text available via subscription   (Followers: 30, SJR: 0.126, CiteScore: 0)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 2)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 12, SJR: 0.992, CiteScore: 1)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 12, SJR: 1.551, CiteScore: 4)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 24, SJR: 2.089, CiteScore: 5)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 15, SJR: 0.572, CiteScore: 2)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.61, CiteScore: 7)
Advances in Botanical Research     Full-text available via subscription   (Followers: 2, SJR: 0.686, CiteScore: 2)
Advances in Cancer Research     Full-text available via subscription   (Followers: 35, SJR: 3.043, CiteScore: 6)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 9, SJR: 1.453, CiteScore: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 1.992, CiteScore: 5)
Advances in Cell Aging and Gerontology     Full-text available via subscription   (Followers: 5)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 14)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 29, SJR: 0.156, CiteScore: 1)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 11, SJR: 0.713, CiteScore: 1)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 11, SJR: 1.316, CiteScore: 2)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 27, SJR: 1.562, CiteScore: 3)
Advances in Clinical Radiology     Full-text available via subscription   (Followers: 1)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 21, SJR: 1.977, CiteScore: 8)
Advances in Computers     Full-text available via subscription   (Followers: 14, SJR: 0.205, CiteScore: 1)
Advances in Cosmetic Surgery     Full-text available via subscription   (Followers: 1)
Advances in Dermatology     Full-text available via subscription   (Followers: 16)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 14)
Advances in Digestive Medicine     Open Access   (Followers: 14)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 7)
Advances in Drug Research     Full-text available via subscription   (Followers: 26)
Advances in Ecological Research     Full-text available via subscription   (Followers: 44, SJR: 2.524, CiteScore: 4)
Advances in Engineering Software     Hybrid Journal   (Followers: 30, SJR: 1.159, CiteScore: 4)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 9)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 51, SJR: 5.39, CiteScore: 8)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 2)
Advances in Family Practice Nursing     Full-text available via subscription   (Followers: 1)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 9)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 69, SJR: 0.591, CiteScore: 2)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 17)
Advances in Genetics     Full-text available via subscription   (Followers: 21, SJR: 1.354, CiteScore: 4)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11, SJR: 12.74, CiteScore: 13)
Advances in Geophysics     Full-text available via subscription   (Followers: 8, SJR: 1.193, CiteScore: 3)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 26, SJR: 0.368, CiteScore: 1)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 11, SJR: 0.749, CiteScore: 3)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 26)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 4, SJR: 0.193, CiteScore: 0)
Advances in Immunology     Full-text available via subscription   (Followers: 37, SJR: 4.433, CiteScore: 6)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 10, SJR: 1.163, CiteScore: 2)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 2, SJR: 1.938, CiteScore: 3)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 6, SJR: 0.176, CiteScore: 0)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 3)
Advances in Life Course Research     Hybrid Journal   (Followers: 10, SJR: 0.682, CiteScore: 2)
Advances in Lipobiology     Full-text available via subscription   (Followers: 1)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Marine Biology     Full-text available via subscription   (Followers: 21, SJR: 0.88, CiteScore: 2)
Advances in Mathematics     Full-text available via subscription   (Followers: 17, SJR: 3.027, CiteScore: 2)
Advances in Medical Sciences     Hybrid Journal   (Followers: 9, SJR: 0.694, CiteScore: 2)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 5, SJR: 1.158, CiteScore: 3)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 26)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 8)
Advances in Molecular Pathology     Hybrid Journal   (Followers: 1)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 7, SJR: 0.182, CiteScore: 0)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 5)
Advances in Oncobiology     Full-text available via subscription   (Followers: 2)
Advances in Ophthalmology and Optometry     Full-text available via subscription   (Followers: 1)
Advances in Organ Biology     Full-text available via subscription   (Followers: 2)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18, SJR: 1.875, CiteScore: 4)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7, SJR: 0.174, CiteScore: 0)
Advances in Parasitology     Full-text available via subscription   (Followers: 6, SJR: 1.579, CiteScore: 4)
Advances in Pediatrics     Full-text available via subscription   (Followers: 27, SJR: 0.461, CiteScore: 1)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 19)
Advances in Pharmacology     Full-text available via subscription   (Followers: 17, SJR: 1.536, CiteScore: 3)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 10, SJR: 0.574, CiteScore: 1)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.109, CiteScore: 1)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 10)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 6)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 19)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20, SJR: 0.791, CiteScore: 2)
Advances in Psychology     Full-text available via subscription   (Followers: 69)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 7, SJR: 0.371, CiteScore: 1)
Advances in Radiation Oncology     Open Access   (Followers: 3, SJR: 0.263, CiteScore: 1)
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 3, SJR: 0.101, CiteScore: 0)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 7)
Advances in Space Research     Full-text available via subscription   (Followers: 433, SJR: 0.569, CiteScore: 2)
Advances in Structural Biology     Full-text available via subscription   (Followers: 6)
Advances in Surgery     Full-text available via subscription   (Followers: 13, SJR: 0.555, CiteScore: 2)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 36, SJR: 2.208, CiteScore: 4)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 20)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 15)
Advances in Virus Research     Full-text available via subscription   (Followers: 6, SJR: 2.262, CiteScore: 5)
Advances in Water Resources     Hybrid Journal   (Followers: 57, SJR: 1.551, CiteScore: 3)
Aeolian Research     Hybrid Journal   (Followers: 6, SJR: 1.117, CiteScore: 3)
Aerospace Science and Technology     Hybrid Journal   (Followers: 398, SJR: 0.796, CiteScore: 3)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.42, CiteScore: 2)
African J. of Emergency Medicine     Open Access   (Followers: 6, SJR: 0.296, CiteScore: 0)
Ageing Research Reviews     Hybrid Journal   (Followers: 12, SJR: 3.671, CiteScore: 9)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 485, SJR: 1.238, CiteScore: 3)
Agri Gene     Hybrid Journal   (Followers: 1, SJR: 0.13, CiteScore: 0)
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 18, SJR: 1.818, CiteScore: 5)
Agricultural Systems     Hybrid Journal   (Followers: 32, SJR: 1.156, CiteScore: 4)
Agricultural Water Management     Hybrid Journal   (Followers: 47, SJR: 1.272, CiteScore: 3)
Agriculture and Agricultural Science Procedia     Open Access   (Followers: 4)
Agriculture and Natural Resources     Open Access   (Followers: 3)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 58, SJR: 1.747, CiteScore: 4)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.589, CiteScore: 3)
Air Medical J.     Hybrid Journal   (Followers: 8, SJR: 0.26, CiteScore: 0)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.19, CiteScore: 0)
Alcohol     Hybrid Journal   (Followers: 12, SJR: 1.153, CiteScore: 3)
Alcoholism and Drug Addiction     Open Access   (Followers: 12)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 2, SJR: 0.604, CiteScore: 3)
Alexandria J. of Medicine     Open Access   (Followers: 1, SJR: 0.191, CiteScore: 1)
Algal Research     Partially Free   (Followers: 11, SJR: 1.142, CiteScore: 4)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.504, CiteScore: 1)
Allergology Intl.     Open Access   (Followers: 5, SJR: 1.148, CiteScore: 2)
Alpha Omegan     Full-text available via subscription   (SJR: 3.521, CiteScore: 6)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 11, SJR: 0.201, CiteScore: 1)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 56, SJR: 4.66, CiteScore: 10)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 6, SJR: 1.796, CiteScore: 4)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 6, SJR: 1.108, CiteScore: 3)
Ambulatory Pediatrics     Hybrid Journal   (Followers: 5)
American Heart J.     Hybrid Journal   (Followers: 59, SJR: 3.267, CiteScore: 4)
American J. of Cardiology     Hybrid Journal   (Followers: 67, SJR: 1.93, CiteScore: 3)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 48, SJR: 0.604, CiteScore: 1)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 13)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 17, SJR: 1.524, CiteScore: 3)
American J. of Human Genetics     Hybrid Journal   (Followers: 40, SJR: 7.45, CiteScore: 8)
American J. of Infection Control     Hybrid Journal   (Followers: 35, SJR: 1.062, CiteScore: 2)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 37, SJR: 2.973, CiteScore: 4)
American J. of Medicine     Hybrid Journal   (Followers: 51)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3, SJR: 1.967, CiteScore: 2)
American J. of Obstetrics & Gynecology MFM     Hybrid Journal   (Followers: 1)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 276, SJR: 2.7, CiteScore: 4)
American J. of Ophthalmology     Hybrid Journal   (Followers: 67, SJR: 3.184, CiteScore: 4)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 5, SJR: 0.265, CiteScore: 0)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.289, CiteScore: 1)
American J. of Otolaryngology     Hybrid Journal   (Followers: 25, SJR: 0.59, CiteScore: 1)
American J. of Pathology     Hybrid Journal   (Followers: 32, SJR: 2.139, CiteScore: 4)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 29, SJR: 2.164, CiteScore: 4)
American J. of Surgery     Hybrid Journal   (Followers: 39, SJR: 1.141, CiteScore: 2)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.767, CiteScore: 1)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 7)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.144, CiteScore: 3)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 67, SJR: 0.138, CiteScore: 0)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 26, SJR: 0.411, CiteScore: 1)
Anales de Cirugia Vascular     Full-text available via subscription   (Followers: 1)
Anales de Pediatría     Full-text available via subscription   (Followers: 3, SJR: 0.277, CiteScore: 0)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription  
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 6, SJR: 4.849, CiteScore: 10)
Analytica Chimica Acta     Hybrid Journal   (Followers: 44, SJR: 1.512, CiteScore: 5)
Analytica Chimica Acta : X     Open Access  
Analytical Biochemistry     Hybrid Journal   (Followers: 223, SJR: 0.633, CiteScore: 2)
Analytical Chemistry Research     Open Access   (Followers: 13, SJR: 0.411, CiteScore: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 14)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 2)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 25, SJR: 0.683, CiteScore: 2)

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Similar Journals
Journal Cover
International Journal of Mass Spectrometry
Journal Prestige (SJR): 0.61
Citation Impact (citeScore): 2
Number of Followers: 16  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1387-3806 - ISSN (Online) 1387-3806
Published by Elsevier Homepage  [3206 journals]
  • Ion trap operational modes for ion/ion reactions yielding high
           mass-to-charge product ions
    • Abstract: Publication date: Available online 21 February 2020Source: International Journal of Mass SpectrometryAuthor(s): Kenneth W. Lee, Gregory S. Eakins, Mark S. Carlsen, Scott A. McLuckeyTo better probe large biomolecular complexes, developments in mass spectrometry (MS) have focused on improving technologies used to generate, transmit, and measure high m/z ions. The additional tandem-MS (MSn) capabilities of ion trap mass spectrometers (ITMS) facilitate experiments that facilitate probing complex biomolecular ions. In particular, charge reduction using gas-phase ion/ion reactions increase separation of charge states generated via electrospray ionization (ESI), which increases confidence in charge state assignments and therefore masses determined from the observed charge states. Current ITMS technologies struggle to generate and measure low charge states of large (>50 kDa) proteins and complexes because of power limitations associated with conventional high-frequency sine wave operation. Other approaches, including frequency scanning techniques and use of digital waveforms, reduce or eliminate some of these limitations. The work presented here studies five different operational modes for a quadrupole ion trap (QIT) mass spectrometer used to generate and measure low charge states of bovine serum albumin (BSA), pyruvate kinase (PK), and GroEL. While digital operation of a QIT presents limitations during the ion/ion reaction period of the experiment, it generally provided the best spectra in terms of resolution and signal at m/z > 50,000.Graphical abstractImage 1
       
  • Cooperative bonding interactions of various oxygen species on the IB group
           metal anions
    • Abstract: Publication date: Available online 17 February 2020Source: International Journal of Mass SpectrometryAuthor(s): Baoqi Yin, Tingting Wang, Yinjuan Chen, Jingjing Yang, Guanjun Wang, Xiaopeng XingSeries of MOx- (M = Cu, Ag, and Au; x = 1–3) complexes and one solitary kind of AgO5- were generated using a magnetron sputter cluster source, and their reactions with additional O2 were studied by combining a low temperature flow reactor and a time-of-flight mass spectrometer. The structures and bonding characters of these complexes were explored according to the observed reaction channels and systematic DFT calculations, in which OAgO-, OAg(η1-O2)-, and (η1-O3)Ag (η1-O2)- were newly observed complexes. The structure (η1-O3)Ag (η1-O2)- was further confirmed using the molecule tagging infrared photodissociation spectroscopy. The theoretical binding energies of oxygen species in MOx- (M = Cu, Ag, and Au; x = 1–3, and 5) are consistent with the experimental observations, which clearly show a cooperative effect of bonding interactions of various oxygen species on the Cu, Ag and Au anions. The contributions of (n-1)d, ns, and np components of the IB metals to their bonding interactions were discussed, which account for the above cooperative effect as well as the much stronger Cu–O bonds than corresponding Ag–O and Au–O bonds in MOx-.Graphical abstractHerein we report studies on the structures and bonds of anionic oxide complexes of IB group metals. The gas phase reactions, the infrared spectroscopy experiment, and the theoretical calculations consistently show that there are cooperative effects among the bonding interactions of various oxygen species on anionic IB group metals, which were well interpreted in the frame of the molecular level theory.Image 1
       
  • Improvement of reflectron time-of-flight mass spectrometer for better
           convergence of ion beam
    • Abstract: Publication date: Available online 8 February 2020Source: International Journal of Mass SpectrometryAuthor(s): Takefumi Handa, Takuya Horio, Masashi Arakawa, Akira TerasakiReflectron time-of-flight mass spectrometer (RTOF-MS) is a powerful tool to achieve high resolution in mass analysis of various ions. As it is often supposed that analyte ions are generated in a small volume in the ion-extraction region, its performance is not optimized for ions spread over a large volume. Not only the mass resolution is degraded due to incomplete space and energy focusing, but also the ion beam is subject to significant divergence of ion trajectories after it is reflected from an ion reflector. Here we present a novel design of RTOF-MS equipped with an additional electrostatic lens in front of a conventional grid-less ion reflector for improving convergence of an ion beam. The performance is examined by mass analysis of Ag3+ ions extracted from a volume of 6.3 cm3, i.e., a cylinder with 20-mm length and 20-mm diameter. The improved convergence of an ion beam is demonstrated by a two-dimensional image of ions on the ion detector. Mass resolution is evaluated as well.Graphical abstractImage 1
       
  • Methylation as a strategy for enhancing sensitivity and selectivity in
           peptide analysis with Differential Mobility Spectrometry (DMS)
    • Abstract: Publication date: Available online 8 February 2020Source: International Journal of Mass SpectrometryAuthor(s): Voislav Blagojevic, Amanda De Fillipis, Diethard K. BohmeBenefits and drawbacks of combining in-vacuo/solution methylation with ESI-DMS-MS analysis are demonstrated in studies with the peptides pentaalanine and [Glu1] fibrinopeptide B. Methylation introduces a quaternary ammonium at the N-terminus of the peptide and changes the number of protonation sites. This has allowed the comparative quantification of sensitivity and selectivity with and without methylation. The transformation of the protonation site in pentaalanine to a quaternary ammonium was observed to reduce DMS selectivity and this was attributed to a weaker ion/modifier interaction. On the other hand, sensitivity was increased and this was attributed to the elimination of ion loss by proton transfer to the modifier. Methylation of [Glu1] fibrinopeptide B was observed not to change the charge state as one protonation site is displaced by a quaternary ammonium. Sensitivity was increased due to suppression of proton transfer to the modifier. Selectivity was not significantly affected in this case as ion/modifier interaction was maintained through the additional protonation site. Our study was conducted with 5 different modifiers and some of their mixtures.Graphical abstractImage 1
       
  • A novel contrast of the reactions of 2,4,6-trinitrotoluene (TNT) in
           
    • Abstract: Publication date: Available online 5 February 2020Source: International Journal of Mass SpectrometryAuthor(s): Dilshadbek T. Usmanov, Satoshi Ninomiya, Kenzo Hiraoka, Shinichi YamabeNegative-mode ion/molecule reactions of 2,4,6-trinitrotoluene (TNT) generated in atmospheric-pressure O2 and N2 corona discharge plasmas were studied. In the O2 plasma, charge transfer reaction, O2− • + TNT → O2 + TNT− •, was found as the major reaction channel. The proton abstraction reaction, O2− • + TNT → O2H• + [TNT − H+]−, was negligible, which is in sharp contrast to the formation of [DNT − H+] and [NT − H+] (DNT: 2,4-dinitrotoluene and NT: 2-nitrotoluene). TNT− • further reacts with O3 to form [TNT−NO•]− and [TNT−OH•]−. In atmospheric-pressure N2 plasma, TNT− • was detected as the dominant ion with no fragment ions.Adiabatic electron affinity (EA) of TNT was estimated by density functional theory (DFT) calculations as 2.08 eV. The precise mechanisms of the charge transfer, O2− • + TNT → TNT− • + O2, and TNT− • + O3 were examined by the frontier-orbital theory. The charge transfer may be attained by the specific O2− • coordination on the benzene ring of TNT. Reaction paths of [TNT + O3]− • leading to [TNT − OH•]− and [TNT − NO•]− were investigated by bimolecular reaction of TNT− • with O3. The formation of [TNT−NO•]− was found to be energetically more favorable than that of [TNT−OH•]−.Graphical abstractImage 1
       
  • From vacuum to atmospheric pressure: A review of ambient ion soft landing
    • Abstract: Publication date: Available online 3 February 2020Source: International Journal of Mass SpectrometryAuthor(s): Alessandra Tata, Chiara Salvitti, Federico PepiThe capability to deposit intact highly pure ionic species makes ion soft landing an advantageous mass spectrometric method able to create molecular layers on solid surfaces. Recent advances in this technique gave the possibility to manipulate solvent-free ions in open-air conditions, The high ionic current produced by the new sources as well as the developments of accelerated systems dramatically increase the efficiency of the soft landing process, opening new opportunities for surface modification with self-organized polyatomic structures. This review reports the developments of the ambient ion soft landing, highlights its most recent applications and discusses future perspectives.Graphical abstractImage 1
       
  • Segmented electrostatic trap with inductive, frequency based,
           mass-to-charge ion determination
    • Abstract: Publication date: Available online 30 January 2020Source: International Journal of Mass SpectrometryAuthor(s): T. Rose, R.B. Appleby, P. Nixon, K. Richardson, M. GreenWe propose a new type of mass analyser - an electrostatic ion trap utilising a quadro-logarithmic trapping potential comprising concentric ring electrodes and inductive mass-charge detection in which packets of ions oscillating in a harmonic potential are arranged to be spatially focused as they pass the detection electrodes. Image-current detection is performed by two thin wire electrodes at the centre of the device. The combination of maximised ion velocity and ion focussing improves the signal-to-noise characteristic, allowing the device to operate at high resolution with short transient times. In order to fully exploit the sharp, localized features in the resulting transients, we utilise a Bayesian signal processing algorithm to fully exploit the sharp, localised features in the resulting transients, and to avoid the strong harmonics that would be produced by Fourier transform methods. The geometry of the mass analyser and possible ion introduction methods are described and results from an in-silico model are presented. The properties of ion motion in an ideal quadro-logarithmic potential are reviewed and integration of ion trajectories in the perturbed field created by the device is performed. The detection electronics and the signal processing approach are described and simulated. The potential instrument resolution and detection limits are presented. A simulated mass-to-charge doublet of 100 Th and separation 3 mTh can be resolved in 3.1 μs when there are 250 ions of each species. This corresponds to a simulated resolving power of 33,000 in 3.1 ms.Graphical abstractImage 1
       
  • Optimize the double-spike technique for calcium isotope measurements by
           thermal ionization mass spectrometry (TIMS)
    • Abstract: Publication date: Available online 30 January 2020Source: International Journal of Mass SpectrometryAuthor(s): Fang Liu, Zhaofeng Zhang, Xin Li, Yajun AnThe double spike technique is the most reliable method for calibrating instrumental and chemical mass-dependent fractionation, which has been widely applied in isotopic analysis of many elements such as Mo, Sn, Ru, Ca, etc. However, practical use of double spiking is possibly hindered by the perceived difficulties in proper double spike calibration, mathematical inversion and data reduction. In this study, we will refer to Ca double spike on how to yield excellent isotopic data on TIMS. A detailed description on how to choose and calibrate an optimal double spike is presented. Our main aim is to provide a practical guide when working with double spike, especially for researchers in new isotopic systems.Graphical abstractA practical guide is provided on how to choose and calibrate an optimal double spike. A good calibration of double spike is important before it is used to correct isotopic fractionation. The experimental data (blue crosses) are generally consistent with theoretical curves, suggesting some good validation of the error model proposed by Rudge et al. [21]. When the composition of the double spike is well calibrated, δ44/40Ca values should be independent on the proportion of spike in mixture.Image 1
       
  • Strategies for avoiding saturation effects in ESI-MS
    • Abstract: Publication date: Available online 30 January 2020Source: International Journal of Mass SpectrometryAuthor(s): Alan An Jung Wei, Anuj Joshi, Yuxuan Chen, J. Scott McIndoeAll instruments with detectors are prone to saturation effects at high concentration, and mass spectrometers are no exception. The very high sensitivity of mass spectrometry makes the onset of saturation occur at lower concentrations than other methods, and in cases where the analyte of interest is very reactive, concentrations at which saturation can be problematic may be necessary in order to ensure decomposition is mitigated. Indications that saturation is occurring are provided, and some data processing strategies are outlined, followed by a range of detuning strategies that can be employed to reduce saturation effects in the context of electrospray ionization mass spectrometry (ESI-MS), including lowering voltages on detector or capillary, increasing cone gas flow rates, or adjusting the probe position. A combination of strategies generally allows researchers to make the best possible compromises when studying reactive compounds at relatively high concentration.Graphical abstractImage 1
       
  • Gas chromatography–mass spectrometry profile and antimicrobial
           activities of Ballota bullata Pomel and B. nigra L. subsp. uncinata (Fiori
           & Bég.): A comparative analysis
    • Abstract: Publication date: Available online 25 January 2020Source: International Journal of Mass SpectrometryAuthor(s): Ridha El Mokni, Siwar Majdoub, Ibrahim Jlassi, Rajesh K. Joshi, Saoussen HammamiThis study was carried out to compare for the first time, the chemical composition and antimicrobial activities of essential oils from two Ballota species growing wild in different regions of Tunisia. The volatile oils obtained by hydro-distillation of Ballota bullata Pomel and Ballota nigra L. subsp. uncinata (Fiori & Bég.) Patzak were analyzed by gas chromatography (GC) and gas chromatography mass spectrometry (GC/MS) to investigate the variations in chemical profiles. The results showed a significant difference in terms of essential oil yields and characteristic aroma. Valerianol (18.3%), α-muurolol (7.9%) and spathulenol (7.1%) were identified as the major odorants in B. bullata, while B. nigra subsp. uncinata oil was mainly composed of hexadecanoic acid (31.8%) and linoleic acid (17.9%). In addition, oxygenated sesquiterpenes were found to be the principal constituents of B. bullata essential oil (42.1%), whereas long chain oxygenated hydrocarbons form the main class in B. nigra (49.7%). Moreover, the antimicrobial activities were tested in vitro against five bacteria: Escherichia coli, Pseudomonas aeruginosa, Salmonella enterica, Staphylococcus aureus and Bacillus subtilis and the yeast Candida albicans. B. bullata essential oil showed stronger antibacterial effects comparing to B. nigra oil. Consequently, B. bullata essential oil holds promising antimicrobial potential, confirming its traditional medical use.Graphical abstractImage 1
       
  • Linear and Nonlinear Resonance Ejection of High Mass Ions with charge
           detection rectilinear ion trap mass spectrometer
    • Abstract: Publication date: Available online 22 January 2020Source: International Journal of Mass SpectrometryAuthor(s): Avinash A. Patil, Chen-Wei Lee, Szu-Wei Chou, Chun-Yen Cheng, Wen-Ping PengWe present the linear and nonlinear resonance ejection of high mass-to-charge (m/z) ratio of protein ions with charge detection rectilinear ion trap mass spectrometer (CD RIT-MS). The measurements of ejected high mass ions with dipolar resonance ejection in the presence of high order fields are demonstrated. With linear resonance ejection, it was found the measured ion number could be enhanced by a factor of 3-5 as compared to that with boundary ejection. With nonlinear resonance ejection (with high order fields), e.g. a positive octopolar field, the ion number can be enhanced by a factor of 4-6 as compared to that with boundary ejection. Mass resolution is slightly improved with nonlinear resonance ejection (∼1.4 for cytochrome C ions) as compared to linear resonance ejection and about a factor of 5 improvements as compared to boundary ejection. In addition, when analyzing heavier bovine serum albumin (BSA) ions, it was observed that co-occurrence of boundary and resonance ejection was prominent with respect to m/z values, iso-β points, and auxiliary AC resonance amplitude where the ejection was below an octopolar field point of βu = 0.70.Graphical abstractImage 1
       
  • Design, construction and performance of a TOF-SIMS for analysis of trace
           elements in geological materials
    • Abstract: Publication date: April 2020Source: International Journal of Mass Spectrometry, Volume 450Author(s): Tao Long, Stephen W.J. Clement, Hangqiang Xie, Dunyi LiuA new TOF-SIMS with high spatial and mass resolution has been constructed and applied to the in-situ micro-scale analysis of trace elements in geological materials with complex structural and chemical features. Double second-order reflectrons without mesh between different electric field regions of achieve greatly improved secondary ion transmission and mass resolution. The new TOF-SIMS can produce an O2- beam of ca. 5 μm diameter with a beam intensity of ca. 5 nA and a secondary ion mass resolution of more than 20,000 (FWHM). Functionality has been demonstrated by the analysis of Ti and rare earth elements in zircon.Graphical abstractA new TOF-SIMS has been constructed and applied to the in-situ micro-scale analysis of trace elements in geological materials with complex structural and chemical features. The new TOF-SIMS can achieve an O2- beam of ca. 5 μm diameter with a beam intensity of ca. 5 nA, a secondary ion mass resolution of>20,000 (FWHM) and the detection limit of better than 0.2 ppm. Functionality has been demonstrated by the analysis of Ti and rare earth elements in zircon.Image 1
       
  • High resolution mass spectrometry for single cell analysis
    • Abstract: Publication date: Available online 21 January 2020Source: International Journal of Mass SpectrometryAuthor(s): Muhammad Shemyal Nisar, Xiangwei ZhaoMass spectrometry is an important analytical tool that has found pervasive use in numerous fields. This review tries to look at the recent advances in high resolution mass spectrometry for single cell analysis. This manuscript is specifically focused at the developments, progresses and bottle necks in the resolution of the instruments developed for of mass spectrometry. These advances have been able to foment further challenges which require further research. This paper attempts to highlight these challenges and alludes to possible solutions for these challenges.Graphical abstractMass spectrometry is an important analytical tool that has found pervasive use in numerous fields. This review tries to look at the recent advances in high resolution mass spectrometry for single cell analysis. This manuscript is specifically focused at the developments, progresses and bottle necks in the resolution of the instruments developed for of mass spectrometry. These advances have been able to foment further challenges which require further research. This paper attempts to highlight these challenges and alludes to possible solutions for these challenges.Image 1
       
  • Influence of the RF drive potential on the acceptance behavior of pure
           quadrupole mass filters operated in stability zones A and B
    • Abstract: Publication date: Available online 21 January 2020Source: International Journal of Mass SpectrometryAuthor(s): Adam P. Huntley, Gregory F. Brabeck, Peter T.A. ReillyThe quadrupole acceptance of sinusoidal mass filters has been an area of interest for over fifty years. More recently, frequency dynamic rectangular waveform driven mass filters (colloquially digital mass filters) have been demonstrated. The acceptance of these devices has not been investigated. Commonly the acceptance of a quadrupole mass filter is calculated using the method of ellipses. Earlier this year, our group introduced an alternative method of calculating acceptance planes. The plane method is a simple and fast approach compared to ellipses. In this work, sinusoidal and digital RF driven mass filters modeled in stability zones A and B are explored using the plane method. The acceptance behavior of systems in zone B differ greatly from their zone A counterparts. There are considerable differences between the mass filter types operated in zone B. The type of RF drive potential plays an important role in the behavior of filters modeled in zone B.Graphical abstractImage 1
       
  • Precise and rapid isotopic analysis of lithium in refractory materials
           using NaLiBO2 + by thermal ionization mass spectrometry (TIMS)
    • Abstract: Publication date: Available online 17 January 2020Source: International Journal of Mass SpectrometryAuthor(s): Radhika M. Rao, K. Sasi Bhushan, S. Jagadish Kumar, Raju Shah6Li/7Li isotopic ratio was determined in lithium based compounds and refractory materials by TIMS using a novel approach. The method involved fusion of the samples such as Lithium Aluminate (LiAlO2), Lithium Titanate (Li2TiO3), Lithium Carbonate etc, with Sodium Borate flux directly on the loading filament to produce NaLiBO2+ ions at m/z 71,72 and 73 and Na2BO2+ at m/z 88 and 89. 6Li/7Li was determined by monitoring NaLiBO2+ ions at m/z 71, 72 and 73. Contributions from isotopes of boron to the ion intensity at m/z 71–73, were accounted by sequentially monitoring Na2BO2+, at m/z 88 and 89 during same analysis. L-SVEC Li2CO3was used for the initial investigations to identify the optimum composition of the analyte, sodium borate mixture required for obtaining precise 6Li/7Li ratio and the possible ion formation mechanism. Fusion of the lithium compounds with boron rich sodium borates having compositions such as Na2O·5B2O3 and Na2O·10B2O3 resulted in strong and stable molecular ion intensities for both NaLiBO2+ and Na2BO2+. Average 6Li/7Li isotopic ratio obtained for L-SVEC lithium from ten measurement using this technique was 0.08277 ± 0.00006 (S.D). Refractory compounds Li2TiO3 and LiAlO2 and lithium salts such as Li2CO3 (lithium source for the refractory compounds) and Li2B10O16 were analysed for 6Li/7Li isotopic ratio with precision of better than 0.07% (% R.S.D). Agreement between the 6Li/7Li isotopic ratio of the refractory compound and the starting material signified that there is no matrix induced mass bias. This technique not only resulted precise values for 6Li/7Li isotopic ratio but has also simplified the procedure for isotopic analysis of Li in refractory materials by circumventing the dissolution and purification step that would have been otherwise required for established mass spectrometric methods.Graphical abstractThe 6Li/7Li ratio obtained for 10 independent analysis of L-SVEC Li2CO3 fused with Na2B20O31 is shown. Two different sources of H3BO3, SRM 951(samples 1 to 6) and Sigma Aldrich (samples 7 to 10) were used for preparing Na2B20O31. The experimentally obtained 10B/11B ratio from 88I/89I (Fig. 3b) along with corresponding shift in 72I/73I ratio(Fig. 3a) for each of these sample mixtures is shown. The 6Li/7Li ratio derived using the experimental 10B/11B values and 72I/73I ratio in Equation (4) gave a reproducibility of 0.07% (Fig. 3c).Image 1
       
  • Electron attachment and electron ionization of helium droplets containing
           clusters of C60 and formic acid
    • Abstract: Publication date: Available online 16 January 2020Source: International Journal of Mass SpectrometryAuthor(s): Masoomeh Mahmoodi-Darian, Elias Jabbour Al Maalouf, Samuel Zöttl, Paul Scheier, Olof EchtHigh-resolution mass spectra of helium droplets doped with C60 and formic acid (FA) are ionized by electrons. Positive ion mass spectra reveal cluster ions [(C60)pFAn]+ together with their hydrogenated and dehydrogenated counterparts. Also observed are ions containing one or more water (W) molecules. The abundance distributions of these ions reveal several interesting features: i) [(C60)pFAn]+ ions are more abundant than hydrogenated [(C60)pFAnH]+ ions even though the opposite is true in the absence of C60 (i.e. if p = 0); ii) although [C60FA]+ is the most abundant ion containing a single C60, multiple C60 suppress the [(C60)pFA]+ signal; iii) an enhanced stability of [(C60)pW1FA5H]+ and [(C60)pW2FA6H]+ mirrors that of [W1FA5H]+ and [W2FA6H]+, respectively. On the other hand, the enhanced stability of [C60FA6H]+ finds no parallel in the stability pattern of [FAnH]+ or FAn+. Negative ion mass spectra indicate a propensity for non-dissociated [(C60)pFAn]- anions if p ≥ 1 which contrasts with the dominance of dehydrogenated [FAn-H]- anions.Graphical abstractImage 1
       
  • Interaction of (CCl4)n clusters with nanosecond and picosecond laser
           pulses at discrete wavelengths spanning from IR to UV region: A
           comparative study using TOFMS
    • Abstract: Publication date: Available online 11 January 2020Source: International Journal of Mass SpectrometryAuthor(s): Pramod Sharma, Soumitra Das, Rajesh K. VatsaUsing time-of-flight mass spectrometer (TOFMS), photochemistry of carbon tetrachloride clusters ((CCl4)n) has been investigated upon interaction with nanosecond and picosecond Nd:YAG laser pulses (266, 355, 532 and 1064 nm) spanning over intensity range of ∼1.2 × 109 to 7.9 × 1012 W/cm2. At all the laser wavelengths upon interaction of (CCl4)n clusters with laser pulse, multiphoton excitation leads to excessive fragmentation of cluster constituents, which are subsequently ionized by multiphoton absorption process. Depending on laser wavelength and pulse duration, at 266 and 355 nm these clusters exhibit dominant ion signal corresponding to singly charged fragment ions i.e. Cl+, CCl+, CCl2+ and CCl3+ in the mass spectra. In addition, for studies carried out at 266 nm using picosecond laser pulses minor ion signal corresponding to C2Cl+ and C2Cl2+ were also observed. Generation of these ions has been ascribed to intra-cluster radical chemistry resulting in generation of neutral precursors, which subsequently are multiphoton ionized. At 532 and 1064 nm, dominant ion signal corresponding to multiply charged atomic ions of carbon (up to C4+/C5+) and chlorine (up to C11+) have been observed. Though multiphoton absorption is the primary process driving the photochemistry of (CCl4)n clusters, observation of multiply charged atomic ions at 532 and 1064 nm has been ascribed to dominant role played by quasi-free electrons which are confined within the ionized cluster, in efficient coupling of laser energy at longer laser wavelengths via inverse Bremsstrahlung process.Graphical abstractImage 1
       
  • Identification and quantification of cytotoxic phenolic acids and
           flavonoids in Ixora brachiata by UHPLC-DAD and UHPLC-ESI-MS/MS
    • Abstract: Publication date: Available online 8 January 2020Source: International Journal of Mass SpectrometryAuthor(s): N. Bhagya, K.R. ChandrashekarIxora brachiata a plant with ethnomedicinal value is used in the treatment of skin diseases. The present study was carried out to evaluate the cytotoxic effect of methanolic extract of I. brachiata leaf samples against human breast (MDA-MB-231) and pancreatic (PANC-1) cancer cell lines. An attempt was also made to identify and quantify the phenolic acids and flavonoids using ultra high performance liquid chromatography (UHPLC) – diode array detector (DAD) coupled with electorspray ionisation mass spectroscopy (UHPLC-ESI-MS/MS). The study revealed dose dependant cytotoxicity with 50% inhibitory (IC50) effect of I. brachiata at a concentration of 115.77 and 80 μg/ml against MDA-MB-231 and PANC-1 cells respectively. The IC50 value of cisplatin was recorded at a concentration of 19.76 and 6.22 μg/ml against MDA-MB-231 and PANC-1 cells respectively. UHPLC-DAD and UHPLC-ESI-MS/MS analysis showed the presence of 13 phenolic acids and 10 flavonoids. Quantitative determination of the compounds revealed the presence of significantly high quantity of protocatechuic acid (20.19 ± 0.17 mg/g) with a total yield of 58.55 ± 0.9 mg/g of phenolics. Similarly, a significantly high quantity of myrcetin (5.03 ± 0.02 mg/g) was detected as a major flavonoid out of the total yield of 5.17 ± 0.02 mg/g. The presence of phenolic acids and flavonoids in the leaf methanol extract of I. brachiata might have contributed towards the cytotoxic effect of this plant. However, further investigations are warranted to confirm the specific phenolic acid/flavonoid responsible for the cytotoxic effect of this plant.Graphical abstractImage 1
       
 
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