Although the majority of solid-phase extraction (SPE) is performed with conventional bonded silica-and polymeric-phases, difficult and complex samples may require more specialized stationary phases. In this instalment of "Sample Preparation Perspectives", columnist Ron Majors discusses advanced topics such as multimodal SPE, restricted-access media, molecular imprinted polymers, immunoaffinity extraction phases and other class-or compound-specific sorbents. These phases provide additional selectivity and..
Sep 1, 2007
By:Ronald E. Majors
In this instalment of "Sample Preparation Perspectives", columnist Ron Majors discusses advanced topics such as multimodal SPE, restricted-access media, molecular imprinted polymers, immunoaffinity extraction phases and other class-or compound-specific sorbents...
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 | Sep 1, 2006
By:Ronald E. Majors
Traditional methods for the sample preparation of insoluble solid materials have represented one of the more time consuming and labor intensive efforts in analysis. In this installment of "Sample Prep Perspectives," Ron Majors examines modern sample preparation methods for solids that often involve increased temperature and higher pressure to speed up the extraction process. In addition, modern sample preparation methods have been automated to relieve analysts of the drudgery associated with traditional methods. Here, he reports on automated Soxhlet extraction, supercritical fluid extraction, pressurized fluid extraction–accelerated solvent extraction, and microwave-assisted extraction and updates earlier coverage.
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 | Jun 1, 2006
By:Ronald E. Majors
Liquid-liquid extraction (LLE) is among the most widely used sample preparation methods. In this month's installment of "Sample Prep Perspectives," Ron Majors discusses newer LLE approaches that offer significant advantages over classical methods.
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Mar 1, 2005
By:Ronald E. Majors
A microplate is a flat plate, tray, panel, or dish containing multiple test tubes arranged in rows. The number of test tubes, commonly known as wells, has gone from the standard 96 to...
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Nov 1, 2004
By:Derrick C. Wood, James M. Miller, Ingo Christ
Headspace sampling for gas chromatography (GC) analysis has many advantages, the most important of which is the elimination of many interferences from the sample matrix. In addition to the standard...
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Jun 1, 2004
By:Hanwen Wang, Wenmin Liu, Yafeng Guan
The guest authors validated an in-tube solid-phase microextraction (SPME) device, which was designed for on-line coupling with a capillary gas chromatography (GC) system, for the trace analysis of organic contaminants...
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Sep 1, 2002
By:David A. Wells, Lisa L. Herron
The modern drug discovery process emphasizes rapid data generation and analysis to identify promising new chemical entities early in the development cycle. Advances in genetics, genomics, biochemistry, and pharmacology have...
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Mar 1, 2002
By:Nelson Torto, Jonas Mwatseteza, Thomas Laurell
Microdialysis has been used as a sampling and sample cleanup technique for general analytical chemistry for nearly 30 years, and it has been studied extensively. It has been used routinely...
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