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5 articles for “quadrupole”
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Multipole Magnetic Field Lines Interaction of Neutron Stars
Abstract: In this paper, we present the magnetic field of the collapsed core during a massive star supernova explosion, resulting from the conservation of magnetic flux, which forms a strong magnetic fields (B∽1013 G) Neutron stars. The vector potential from moving electric charge Q uniformly distributed over the surface of the spherical Neutron star of radius R and the multipole magnetic field have calculated. The interaction between the dipole magnetic field …
Published in Research & Reviews : Journal of Physics · Vol. 9, Issue 2, 2020 · pp. 6–15 Read article
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Development and Validation of Liquid Chromatography- Tandem Mass Spectrometric Method for Assay of Zidovudine in Human Urine
Abstract: A sensitive and selective liquid chromatographic-tandem mass spectrometric (LC-MSMS)method was developed to determine zidovudine (ZDV) in human urine. After solidphaseextraction with SPE cartridge, the urine sample was analyzed on a C18 column(Symmetry 3.5 μm; 75×4.6 mm i.d) interfaced with a triple quadrupole tandem massspectrometer. Positive electrospray ionization was employed as the ionization source. Themobile phase consisted of water-acetonitrile (20:80, v/v).The method was linear over aconcentration range of 10–1000 ng mL-1. …
Published in Research and Reviews: A Journal of Pharmaceutical Science · Vol. 5, Issue 3, 2014 · pp. 17–23 Read article
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Determination of Gatifloxacin in Human Urine by Liquid Chromatography-Tandem Mass Spectrometry
Abstract: Gatifloxacin (GTF) is an antibiotic of the fourth-generation fluoroquinolone family that inhibits the bacterial enzymes DNA gyrase and topoisomerase IV. A reliable, sensitive and selective isocratic reversed phase liquid chromatographic-tandem mass spectrometric (LC-MS-MS) method was developed to determine gatifloxacin (GTF) in human urine. GTF, in urine after solid-phase extraction with SPE cartridge, was analyzed on a C18 column (Symmetric 3.5 μm; 75×4.6 mm i.d) interfaced with a triple quadrupole tandem …
Published in Research and Reviews: A Journal of Pharmaceutical Science · Vol. 6, Issue 1, 2015 · pp. 1–6 Read article
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LCMS/MS Analysis of the Ethylacetate Extract of Securidaca longipedunculata Fresen (Polygalaceae) Stem Bark
Abstract: The present study aimed to identify some of the phytoconstituents of a fraction (fraction DDK-4) obtained from the column chromatography of the ethylacetate extract of Securidaca longipedunculata Fresen (Polygalaceae). Liquid Chromatography-Mass Spectrometry (LCMS/MS) analysis of fraction DDK-4 was conducted on a Waters Synapt G2 quadrupole time-of-flight mass spectrometer (Milford, MA, USA) using positive mode of ionization. The results showed that 1,7-dihydroxy-2,8-dimethoxy xanthone, 3-(1,3-benzodi-oxol-5-yl-4-morpholinyl)-3-(2-hydroxy-4,6-dimethoxyphenyl)-1-propanone, 5,7-dihydroxy-6-methyl-3-(2’,4’-dihydroxybenzyl)-chroman-4-one, trans-O-methyl-grandmarin, dioctylamine, rhodioloside, punicic acid, echimidine, …
Published in Research & Reviews: A Journal of Drug Design & Discovery · Vol. 9, Issue 1, 2022 · pp. 39–47 Read article
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Development and Validation of Liquid Chromatography-Tandem Mass Spectrometric Method for Assay of Zidovudine in Human UrineDevelopment and Validation of Liquid Chromatography-Tandem Mass Spectrometric Method for Assay of Zidovudine in Human Urine
Abstract: A sensitive and selective liquid chromatographic-tandem mass spectrometric (LC-MS-MS) method was developed to determine zidovudine (ZDV) in human urine. After solid-phase extraction with SPE cartridge, the urine sample was analyzed on a C18 column (Symmetry 3.5 µm; 75×4.6 mm i.d) interfaced with a triple quadrupole tandem mass spectrometer. Positive electrospray ionization was employed as the ionization source. The mobile phase consisted of water-acetonitrile (20:80, v/v).The method was linear over a …
Published in Research and Reviews: A Journal of Pharmaceutical Science · Vol. 5, Issue 3, 2014 · pp. 17–23 Read article