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LC, GC Europe : solutions for separation scientists
Free accessGWLB - Gottfried Wilhelm Leibniz Bibliothek | Nachgewiesen 14.2001 - -
Quality by Design in Pharmaceutical Analysis Using Computer Simulation with UHPLC - In this study, the quality-by-design principle is applied instead of trial-and-error in the development of a liquid chromatography (LC) method. A mixture of an active pharmaceutical ingredient and its 13 impurities was analyzed on a short narrow-bore column (50 mm × 2.1 mm, packed with sub-2-μm particles) providing short analysis times. The performance of commercial modelling software for robustness testing was systematically compared to experimental measurements and design-of-experiment-based predictions.
Online Contents | 2014| -
Simultaneous Determination of Methylxanthines and Cotinine in Human Plasma by Solid-Phase Extraction Followed by LC-MS-MS - A multi-residue method has been developed and validated for the analysis of methylxanthines (caffeine and its metabolites) and cotinine in human plasma. The method involves off-line solid-phase extraction (SPE) and analysis by liquid chromatography coupled to tandem mass spectrometry LC-MS-MS with electrospray ionization (ESI) in positive mode (PI). The developed and validated method was fast, selective, and convenient for the simultaneous determination of cotinine, caffeine, and its metabolites in human plasma. The method has been successfully applied to the analysis of 500 samples from pregnant women in a clinical study.
Online Contents | 2014| -
Determination of Sulphur-based Odourants in Commercially Available Natural Gas with Flow Modulated Comprehensive Two-Dimensional Gas Chromatography - Pulsed-flow-modulated comprehensive two-dimensional gas chromatography with flame ionization detection was used to separate and identify all common sulphur compounds found in natural gas.
Online Contents | 2014| -
New HPLC systems and related products introduced at pittcon 2014: A brief review
Online Contents | 2014| -
COLUMN WATCH - New Chromatography Columns and Accessories at Pittcon 2014 (Part 2) - Part 2 of our yearly report on new products introduced at Pittcon. This instalment of "Column Watch" covers GC columns, SFC columns, and products for sample preparation including small benchtop instruments.
Online Contents | 2014| -
THE ESSENTIALS - Optimizing LC-MS and LC-MS-MS Methods - Secondary parameters in the interface and mass analyzer can often have a major impact on sensitivity and reproducibility. This column considers how and when to consider optimizing these parameters through a study of the working principles of LC-MS analysis.
Online Contents | 2014 -
SAMPLE PREPARATION PERSPECTIVES - Electrical Potential as a Driving Force in Sample Preparation - Entirely new sample preparation technologies continue to be introduced, mainly in the academic sector. Some of these technologies will undoubtedly stay in the academic laboratory. However, some new technologies may "cross the chasm" and eventually become a standard laboratory procedure. This instalment will examine some of those methods.
Online Contents | 2014|
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