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Column: Sample Prep Perspectives
Sample Preparation Perspectives' editor Ron Majors examines technologies and methodologies for getting your samples ready for chromatographic analysis.

Salting-out Liquid-Liquid Extraction (SALLE)

July 1, 2009

Ron Majors discusses the technique of Salting-out Liquid-Liquid Extraction (SALLE) and provides some examples of its successful applications.

Stir Bar Sorptive Extraction (SBSE) and Headspace Sorptive Extraction (HSSE): An Overview

May 1, 2009

The guest columnists review SBSE and HSSE and examine their advantages and limitations, along with providing approaches to overcoming the latter.

Practical Aspects of Solvent Extraction

March 1, 2009

Columnist Ron Majors discusses some of the practical considerations in the successful application of the popular yet age-old technique of solvent extraction (also known as liquid–liquid extraction, or LLE). After a brief review of the basics, guidelines on the selection of the appropriate extraction solvents and how to use acid–base equilibria to ensure efficient extractions of ionic and ionizable compounds are provided. Problems in LLE and the solutions to these problems are highlighted. A newer technique called dispersive liquid–liquid microextraction (DLLME) is introduced.

Extraction and Preconcentration of Residues and Contaminants in Food Samples Using Membrane Techniques

February 1, 2009

Guest authors from South Africa review the application of membranes in the extraction, preconcentration, and separation of various contaminants in food.

Practical Aspects of Solvent Extraction

December 1, 2008

Columnist Ron Majors discusses some of the practical considerations in the successful application of the popular yet age-old technique of solvent extraction (also known as liquid–liquid extraction, or LLE).

The Role of Polymers in Solid-Phase Extraction and Sample Preparation

November 1, 2008

This installment of SPP will compare and contrast the various types of polymeric and non-polymeric sorbents. The major advantages or polymeric sorbents will be discussed, and some applications will illustrate the versatility of polymeric SPE.

Dynamic Extraction: A High-Speed, High-Capacity Purification Process That is Rapidly Scalable

May 1, 2008

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

December 1, 2007

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

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.

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