نتایج جستجو برای: lc ms
تعداد نتایج: 140189 فیلتر نتایج به سال:
Natural flavonoids, alkaloids, saponins and sesquiterpenoids have been extensively investigated because of their biological and physiological significances, as well as their promising clinical uses. It is necessary to monitor them or their metabolites in biological fluids for both pre-clinical studies and routine clinical uses. The successful hyphenation of LC and MS, which was thought as "the ...
Liquid chromatography (LC) coupled with mass spectrometry (MS) is widely used for the determination of mycotoxins in cereals and cereal-based products. In addition to the regulated mycotoxins, for which official control is required, LC-MS is often used for the screening of a large range of mycotoxins and/or for the identification and characterization of novel metabolites. This review provides i...
27 The brain stem nucleus Locus Coeruleus (LC) is thought to modulate cortical excitability 28 by norepinephrine (NE) release in LC forebrain targets. The effects of LC burst 29 discharge, typically evoked by a strong excitatory input, on cortical ongoing activity are 30 poorly understood. To address this question, we combined direct electrical stimulation of 31 LC (LC-DES) with extracellular r...
We describe an integrated micro-liquid chromatograph/ mass spectrometer (micro-LC/MS) system capable of performing routine determinations for 1-10 ng of drugs and their metabolites extracted from biological fluids. The micro-LC is constructed from conventional “high-performance” liquid-chromatographic instrumentation by using commercially available components. The mass spectrometer is operated ...
Objective: Ipomoea mauritiana is used in both Ayurveda and folk medicine systems. The tuberous roots are known to be diuretic, depurative, carminative, and anthelmintic. The objective of the current study was to identify phenolic antioxidants from I. mauritiana using spectrophotometric and LC-MS analysis. Materials and Methods: An activity-guided fractionation and purification process was used t...
BACKGROUND The recent interest of clinical laboratories in developing serum testosterone assays based on isotope dilution-liquid chromatography-tandem mass spectrometry (ID-LC-MS/MS) stems from the lack of accuracy of direct immunoassays. In this study, we assessed the accuracy and state of standardization (traceability) of 4 published ID-LC-MS/MS procedures in a method comparison with an ID-ga...
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