The Unique Selectivity of π-Interactions for Solid-Phase Extraction
January 1st 2009Hypercrosslinked polystyrene-type (solid-phase extraction) SPE materials exhibit a unique ability to enter p-interactions with aromatic, heterocyclic and unsaturated compounds. This property permits selective extraction and pre-concentration of the above classes of species from non-polar media and fatty matrices. The principle has been exploited for developing analytical protocols to determine polar furan derivatives in mineral transformer oil, polyaromatic hydrocarbons (PAHs) in smoked fish and for the fractionation of polychlorinated aromatic compounds in environmental matrices.
Current Advances in Microextraction by Packed Sorbent (MEPS) for Bioanalysis Applications
January 1st 2009Microextraction by packed sorbent (MEPS) is a new technique in sample preparation that can be connected on-line to gas chromatography (GC) or liquid chromatography (LC) without any modifications.
Microwave-Induced Combustion Digestion of Petroleum Coke Samples
December 15th 2008Researchers at Universidade Federal de Santa Maria (Santa Maria, Brazil) and Centro de Pesquisas e Desenvolvimento Leopold Americo Miguez de Mello-CENPES/PETROBAS (Rio de Janeiro, Brazil) analyzed chloride in petroleum coke samples using microwave-induced combustion followed by ion chromatography.
Headspace SPME Used in Chlorophenols Analysis
December 15th 2008Researchers from National Chung Hsing University (Taichung, Taiwan) analyzed four chlorophenols in aqueous samples using purge-assisted headspace solid-phase microextraction (SPME) followed by gas chromatography?mass spectrometry (GC?MS).
Thermo Fisher Scientific Launches Melamine Analysis Program
December 15th 2008In response to the recent alert issued by the U.S. Food and Drug Administration, Thermo Fisher Scientific (Waltham, Massachusetts) has initiated a program focused on assisting government and commercial food testing laboratories in developing and implementing methods for analyzing melamine in food products imported from China.
Instant Controlled Pressure Drop Used in Oligosaccharide Analysis
December 15th 2008A research group from LMTAI (La Rochelle, France) and LVMH Recherche (St. Jean de Braye Cedex, France) analyzed the oligosaccharides ciceritol and stachyose extracted from Tephrosia purpurea seeds using an instant controlled pressure drop pretreatment before solvent extraction.
Sonication-Assisted Extraction of Parabens in Environmental Samples
December 15th 2008Scientists from INIA (Madrid, Spain) used ultrasonic-assisted extraction followed by liquid chromatography with triple-quadrupole mass spectrometry detection (LC?MS) to analyze paraben compounds in environmental solid samples.