نتایج جستجو برای: hplc apci

تعداد نتایج: 33470  

2015
Andrés Domínguez Carmen Jarne Vicente L. Cebolla Javier Galbán María Savirón Jesús Orduna Luis Membrado María-Pilar Lapieza Elena Romero Susana de Marcos Rosa Garriga Mark Devlin Maloney

Hyphenated HPTLC has been used to analyze several neutral sphingolipids acting as lysosomal storage disease (LSD) biomarkers. Automated multiple development (AMD) provides separation of lipid peaks, which are detected and quantified using fluorescence detection by intensity changes (FDIC) after primuline post-impregnation. A final online transfer to a mass spectrometer by means of an elution-ba...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد شاهرود - دانشکده فنی 1391

دسترسی کشورهای در حال توسعه به انواع منابع انرژی ، برای توسعه اقتصادی آنها اهمیت ویژه ای دارد.یکی از مهمترین این منابع در قرن جدید گاز طبیعی است.گاز طبیعی را باید از محل استخراج و تصفیه به بازارهای مصرف, که عمدتا مسافتی طولانی بین آنها وجود دارد،انتقال داد. امکان استفاده از لوله کشی در انتقال گاز برای فواصل طولانی میسر نیست.گاز طبیعی مایع lng) ) با کاهش 600 برابری حجمی می تواند گزینه مناسبی برا...

Journal: :Journal of chromatography. A 2009
Risto Kostiainen Tiina J Kauppila

The most widely used ionization techniques in liquid chromatography-mass spectrometry (LC-MS) are electrospray ionization (ESI), atmospheric pressure chemical ionization (APCI) and atmospheric pressure photoionization (APPI). All three provide user friendly coupling of LC to MS. Achieving optimal LC-MS conditions is not always easy, however, owing to the complexity of ionization processes and t...

Journal: :Analytical chemistry 2009
Koffi Badjagbo Alexandra Furtos Mehran Alaee Serge Moore Sébastien Sauvé

Atmospheric pressure chemical ionization-tandem mass spectrometry (APCI-MS/MS) was applied for the first time to the direct analysis of octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) in gaseous matrixes without extraction or prior chromatographic separation. Mass spectrometric characteristics of both compounds under APCI conditions and their fragmentation behavior in MS...

Journal: :Analytical and bioanalytical chemistry 2003
Sven Meyer Jürgen O Metzger

Electrospray ionization mass spectrometry (ESI-MS) coupled to a microreactor is an excellent tool for the investigation of reactions in solution. Here, we report the first results of our investigations into preparatively interesting electron-transfer-initiated chain reactions in solution which proceed via radical cations as reactive intermediates. The tris(p-bromophenyl)aminium hexachloroantimo...

Journal: :Journal of chromatography. B, Analytical technologies in the biomedical and life sciences 2010
Ciska Wyns Selin Bolca Denis De Keukeleire Arne Heyerick

The investigation into the potential usefulness of phytoestrogens in the treatment of menopausal symptoms requires large-scale clinical trials that involve rapid, validated assays for the characterization and quantification of the phytoestrogenic precursors and their metabolites in biological matrices, as large interindividual differences in metabolism and bioavailability have been reported. Co...

Journal: :Toxicological sciences : an official journal of the Society of Toxicology 2000
K L Willett P R Gardinali L A Lienesch R T Di Giulio

Differential susceptibility of polycyclic aromatic hydrocarbon (PAH)-mediated liver cancer exists in two related species of Ictalurid catfish. Two hypotheses are addressed in this study to explain this difference. Specifically, the relatively insensitive channel catfish 1) do not produce mutagenic PAH metabolites, and/or 2) they more quickly eliminate PAHs due to greater Phase II enzyme activit...

Journal: :Metallomics : integrated biometal science 2013
Laurent Ouerdane Federica Aureli Paulina Flis Katarzyna Bierla Hugues Preud'homme Francesco Cubadda Joanna Szpunar

An analytical methodology based on high-resolution high mass accuracy electrospray ionization (ESI) tandem MS assisted by Se-specific detection using inductively coupled plasma mass spectrometry (ICP MS) was developed for speciation of selenium (Se) in seeds of black mustard (Brassica nigra) grown on Se-rich soil. Size-exclusion LC-ICP MS allowed the determination of the Se distribution accordi...

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