Dynamic Extraction: A High-Speed, High-Capacity Purification Process That is Rapidly Scalable May 1, 2008 By: Ian J. Garrard, Derek Fisher, Ian A. Sutherland

The authors discuss a preparative process using the principles of countercurrent chromatography. This process is faster, capable of loadings from milligrams to hundreds of grams, and uses robust equipment.

Immunosorbents for Selective Sample Preparation of Complex Mixtures Dec 1, 2007 By: Ronald E. Majors

In this month?s installment, columnist Ron Majors covers the field of immunoextraction, a technique that employs immobilized antibodies to selectively capture specific analytes using molecular recognition via antibody?antigen interactions. Recently, the introduction of commercial products for specific high-volume environmental and food safety applications has spurred further applications of this technique.

QuEChERS - A New Sample Preparation Technique for Multiresidue Analysis of Pesticides in Foods and Agricultural Samples May 1, 2007 By: Ronald E. Majors

This month's installment of "Sample Prep Perspectives" describes a new extraction technique called QuEChERS (standing for quick, easy, cheap, effective, and safe and is pronounced "catchers") for the sample preparation of pesticides in foods and agricultural samples.

Removal and Depletion of High-Abundance Proteins from Biological Fluids Feb 1, 2007 By: Ronald E. Majors, Nina Zolotarjova, Peter Mrozinski

This installment of "Sample Prep Perspectives" discusses techniques for the reduction/depletion of high-abundance proteins.

Advanced Topics in Solid-Phase Extraction: Chemistries Jan 1, 2007 By: Ronald E. Majors

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 installment of "Sample Prep 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 procedures using them can be automated. Representative applications will be presented.

Modern Technique for the Extraction of Solid Materials - An Update Jul 1, 2006 By: Ronald E. Majors

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.

The Role of Passive Samplers in the Monitoring of Aquatic Ecosystems and Occupational Hygiene Pollution Jul 1, 2006 By: Luke Chimuka, Ewa Cukrowska

Commercialization of the passive sampler is very important because it reflects acceptance by the wider community.

The Role of Passive Samplers in the Monitoring of Aquatic Ecosystems and Occupational Hygiene Pollution Jun 1, 2006 By: Luke Chimuka, Ewa Cukrowska

Guest authors Luke Chimuka and Ewa Cukrowska provide an in-depth look at the verious approaches to passive sampling, weighing the merits and challenges for each type.