Field Ionization Sources

Beckey, H. D.

doi:10.1016/b978-0-08-017557-7.50006-5

Cited by 27 publications

(33 citation statements)

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“…Mass spectrometry provides abundant information for the structural elucidation of the compounds when tandem mass spectrometry (MS) is applied. Therefore, the combination of HPLC and MS facilitates rapid and accurate identification of chemical compounds in medicinal herbs, especially when a pure standard is unavailable [ 37 , 38 , 39 , 40 ]. Recently, LC/MS has been extensively used for the analysis of phenolic compounds.…”

Section: Methods Used For Bioactive Compound Extraction Isolationmentioning

confidence: 99%

Phytochemicals: Extraction, Isolation, and Identification of Bioactive Compounds from Plant Extracts

Altemimi

Lakhssassi

Baharlouei

et al. 2017

Plants

1,314

768

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There are concerns about using synthetic phenolic antioxidants such as butylated hydroxytoluene (BHT) and butylated hydroxyanisole (BHA) as food additives because of the reported negative effects on human health. Thus, a replacement of these synthetics by antioxidant extractions from various foods has been proposed. More than 8000 different phenolic compounds have been characterized; fruits and vegetables are the prime sources of natural antioxidants. In order to extract, measure, and identify bioactive compounds from a wide variety of fruits and vegetables, researchers use multiple techniques and methods. This review includes a brief description of a wide range of different assays. The antioxidant, antimicrobial, and anticancer properties of phenolic natural products from fruits and vegetables are also discussed.

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Section: Methods Used For Bioactive Compound Extraction Isolationmentioning

confidence: 99%

Phytochemicals: Extraction, Isolation, and Identification of Bioactive Compounds from Plant Extracts

Altemimi

Lakhssassi

Baharlouei

et al. 2017

Plants

1,314

768

View full text Add to dashboard Cite

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“…Several reviews on the older techniques are available. Among these techniques is the use of strong electric fields (more than lo8 V/cm, as demonstrated by Beckey more than 20 years ago [109]) to induce ionization of large molecules via electron tunneling or "field desolvation" (i.e., cation attachment), arid subsequent ion desorption by the Coulomb forces into the gas phase. The technique, termed field desorption, is probably the "purest" surface desorption technique available, and the true pioneer among the desorption techniques for the study of nonvolatile biomolecules.…”

Section: Other Energy Deposition Techniquesmentioning

confidence: 99%

Particle‐induced desorption in mass spectrometry. Part I. Mechanisms and processes

Demirev

1995

Mass Spectrometry Reviews

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Desorption of (predominantly) organic molecules, induced by particles with keV to MeV energy incident on a condensed phase target, is the topic of this review. The focus is on MeV atomic ion‐induced desorption–plasma desorption (PD). Parallels with keV particle desorption–secondary ion mass spectrometry (SIMS) and fast atom bombardment (FAB)–will be presented more schematically and chiefly for comparison purposes. Current understanding of desorption mechanisms by referring to insights from theory of the processes is surveyed, and the underlying similarities as well as differences between keV and MeV particle desorption are addressed. Several connections between particle‐induced desorption and photon‐induced desorption (e.g., matrix‐assisted laser desorption/ionization‐MALDI) are briefly outlined. Results from computer simulations are used to visualize the dynamics of the desorption process. A brief description of experimental characteristics of desorbed species, aimed at elucidating the mechanisms of desorption, is given, partly to illustrate the use of mass spectrometry in fundamental studies of ion–solid interactions. Ionization pathways in PD and molecular SIMS are briejy summarized. No special emphasis is placed in describing the “generic” instrumental setup f o r particle desorption and only specific technical aspects, not treated elsewhere, eg., time and spatial correlation of the ejected species, are discussed here. In the second part of this review (subsequent article) desorption induced by polyatomic projectiles, and effects, accompanying ion ejection, namely secondary electron emission, impact‐induced photon emission, and sputtering of clusters (fullerenes in particular), are also reviewed. In conclusion, selected examples for analytical applications of desorption methods that may illustrate current and emerging trends and perspectives are discussed. © 1996 John Wiley & Sons, Inc.

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“…The atomic tunneling model provides a good qualitative understanding of the DC field ionization of molecules in field ionization mass spectrometry experiments [9]. More recent experience with atomic laser ionization suggests that the relatively low ionization potentials of molecules, their lower lying excited states, and their larger size will each contribute to an increase in the ionization rate over the reference ADK atomic rate.…”

Section: Nonlinear Ionization Of Organic Molecules In High Intensity mentioning

confidence: 99%

Nonlinear Ionization of Organic Molecules in High Intensity Laser Fields

et al. 2000

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NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21277544&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21277544&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca.

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Field Ionization Sources

Cited by 27 publications

References 0 publications

Phytochemicals: Extraction, Isolation, and Identification of Bioactive Compounds from Plant Extracts

Phytochemicals: Extraction, Isolation, and Identification of Bioactive Compounds from Plant Extracts

Particle‐induced desorption in mass spectrometry. Part I. Mechanisms and processes

Nonlinear Ionization of Organic Molecules in High Intensity Laser Fields

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