نتایج جستجو برای: uv hplc apci ms

تعداد نتایج: 217767  

2007
Eva Kühn-Hölsken Olexandr Dybkov Björn Sander Reinhard Lührmann Henning Urlaub

Direct UV cross-linking combined with mass spectrometry (MS) is a powerful tool to identify hitherto non-characterized protein-RNA contact sites in native ribonucleoprotein particles (RNPs) such as the spliceosome. Identification of contact sites after cross-linking is restricted by: (i) the relatively low cross-linking yield and (ii) the amount of starting material available for cross-linking ...

Journal: :Talanta 2015
Wen Du Li-Juan Tang Jian-Hui Wen Ke-Jun Zhong Jian-Hui Jiang Hua Wang Bo Chen Ru-Qin Yu

The study of spatial distribution characteristics of the adsorbed compounds for absorbent materials has significant importance in understanding the behaviors of aerosols while they migrating in the absorbent materials. Herein, for the first time, desorption corona beam ionization-mass spectrometry (DCBI-MS) has proposed for direct in-situ analysis of adsorbed aerosol for absorbent materials. DC...

Journal: :Journal of agricultural and food chemistry 2002
Eduardo Guerra-Hernández Antonio Ramirez-Jiménez Belen García-Villanova

Glucosylisomaltol is proposed as a new indicator of the browning reaction in baby cereals and bread. The glucosylisomaltol was synthesized from maltose and proline, purified by semipreparative HPLC, and characterized by NMR, high-resolution mass spectrometry, and GC-MS analysis. Analysis of glucosylisomaltol, previously separated from cereals by centrifugation, was carried out by reversed-phase...

Journal: :iranian journal of pharmaceutical research 0
heng luo centre of instrumental analysis, sichuan academy of chinese medicine sciences zhifang huang institute of traditional chinese medicine, sichuan academy of chinese medicine sciences xiaolong tang college of pharmaceuitcal science,chengdu university of traditional chinese medicine jinhai yi institute of traditional chinese medicine, sichuan academy of chinese medicine sciences shuiying chen funan jinsha community health service center of qingyang district andong yang centre of instrumental analysis, sichuan academy of chinese medicine sciences

the chemical components in the decoctions of chinese herbal medicines are not always the same as those in the crude herbs because of the insolubility or instability of some compounds. in this work, a high-performance liquid chromatography (hplc) coupled with electrospray ionization (esi) tandem mass spectrometry method was developed to explore dynamic variation patterns of aconitum alkaloids in...

Journal: :iranian journal of pharmaceutical research 0
jingze zhang department of pharmacy, logistics college of chinese people’s armed police forces, tianjin 300162, china. wenyuan gao school of pharmaceutical science and technology, tianjing university, no.92 weijin road, nankai district, tianjin 300072, china zhen liu school of pharmaceutical science and technology, tianjin university, tianjin 300072, china. zhidan zhang school of pharmaceutical science and technology, tianjin university, tianjin 300072, china changxiao liu the state key laboratories of pharmacodynamics and pharmacokinetics, tianjin, 300193, china.

high performance liquid chromatography (hplc) with diode array detection (dad) and electrospray ionization tandem mass spectrometry (esi/ms/ms) was used to analyze the main components in the methanol extract of fructus aurantii (fa) and the metabolites in rat biological samples after oral administration of the methanol extract of fa. there were 31 constituents identified in the extract of fa in...

Journal: :International Journal of Gastronomy and Food Science 2022

Mushrooms have been used to enhance meat flavor, although studies regarding cooking approach and mushroom type impact on savory flavors are limited. This study aimed compare taste-related compounds (free amino acids 5′-nucleotides) volatile aromas in raw, steamed, roasted white crimini Agaricus bisporus mushrooms. Using gas chromatography–mass spectrometry (GC–MS) high-performance liquid chroma...

2014
Yahya R. Tahboub

Chromatographic behavior of co-eluted compounds from un-extracted drug-free plasma samples was studied by LC-MS and LC-MS/MS with positive APCI. Under soft gradient, total ion chromatogram (TIC) consisted of two major peaks separated by a constant lower intensity region. Early peak (0.15-0.4 min) belongs to polar plasma compounds and consisted of smaller mass ions (m/z<250); late peak (3.6-4.6 ...

Journal: :Talanta 2011
Cornelius T Martha Jan-Carel Hoogendoorn Hubertus Irth Wilfried M A Niessen

Current development in catalyst discovery includes combinatorial synthesis methods for the rapid generation of compound libraries combined with high-throughput performance-screening methods to determine the associated activities. Of these novel methodologies, mass spectrometry (MS) based flow chemistry methods are especially attractive due to the ability to combine sensitive detection of the fo...

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