Ronald E. Majors

Describes practical aspects of hollow-fibre liquid-phase microextraction in the three phase mode (HF3LPME) and also electromembrane extraction (EME).

A presentation of the overall trends in liquid-phase chromatography observed at the symposium, as well as the awards presented and the opening plenary session

A review of HPLC 2011, which took place in Budapest, Hungary in June this year.

An overview of the method translation calculators to make conversions from conventional HPLC to high-throughput HPLC and UHPLC.

The advantages of using software to optimize GC methods with practical examples for pesticide analysis are described.

Method translation software enables conversion and improvement of GC methods.

Converting a method from conventional HPLC to high-throughput HPLC or UHPLC is easy with a method translation calculator. Here's how to use them and where to find them, for free.

A review of the gas chromatography columns, sample preparation, and chromatographic and sample preparation accessories that were presented at Pittcon 2011.

A review of the liquid chromatography columns and accessories for analytical and preparative chromatography to be unveiled at Pittcon 2011

Miniaturization and solvent substitution are two key approaches.

New methods are available for whole blood analysis. Here, various approaches are compared and contrasted.

This installment will trace the development of SPP supports to the present-day versions that rival UHPLC supports.

Ron Majors interviews the inventors of QuEChERS to explore the sucesses, challenges and future potential of this innovative sample preparation technique.

GC expert Jaap de Zeeuw explores the historical development of PLOT columns, covers details of the most popular stationary phases, and provides practical hints.

An interview with the inventors about the successes, challenges and potential future directions of this technique.

Ron Majors presents his yearly review of the HPLC Conference.

In this installment, the subject of LPME is reviewed, with emphasis on the use of hollow fibers.

The inventors of the QuEChERS technique present an update and a look at the future.

We focus on the characterization of reversed-phase columns with particular emphasis on the hydrophobic-subtraction model

The coauthors discuss the various attributes of and approaches to reversed-phase chromatography.

We focus on the characterization of reversed-phase columns with particular emphasis on the hydrophobic-subtraction model

The authors review the requirements for columns specifically designed and manufactured for SFC.

Ron Majors presents the second part of his yearly review of all that was new and innovative at Pittcon 2010, held this year in Orlando, Florida.

Ron Majors reports on some of the improvements that have been made over the years focusing on efficiency, stability, and selectivity.

Improvements in HPLC column technology continue. Since the last Special Supplement on columns in 2008 (1), the continued need for high-throughput separation, the encountering of more complex samples, the need to analyze very polar compounds more easily, and the increased availability of very high pressure instruments has placed additional demands on the HPLC column. In terms of high throughput, no less than 24 companies have responded and have developed small particle columns of 2 µm and under. In addition, the number of superficially porous particle (SPP) columns has expanded, and users are finding that the high-efficiency-at-low-pressure advantage brings them added advantages. With more complex samples, longer columns packed with sub-2-µm particles require higher pressures with pumps now available to 1300 bar. It will be of interest to see if the lower pressure, high-efficiency SPP columns and monoliths, the latter of which have seen advances in the research of polymeric monoliths for applications to..

This month's installment of "Column Watch" features Ron Majors' yearly report on new products introduced at Pittcon 2010.

How the combination of an electroextraction with hollow-fiber liquid-phase microextraction can lead to a selective, rapid new method.

In this installment, columnist Ron Majors and guest columnist Frantisek Svec address the current status of CEC, once the hottest topic in the field.

In this installment of "Column Watch," Ron Majors looks at the results of a recent HPLC column survey conducted by LCGC North America.

Ron Majors provides first-hand coverage of some of the technology and application advances reported at HPLC 2009.