John W. Dolan

John Dolan has been writing "LC Troubleshooting" for LCGC for over 25 years. One of the industry's most respected professionals, John is currently a principal instructor for LC Resources, Walnut Creek, California He is also a member of LCGC's editorial advisory board.

How to make gradient separations faster without changing the separation

Deterioration of the separation can result from many causes. This month's column looks at some techniques to isolate the problem source.

A broad peak where it doesn't belong is a classic sign of late elution.

John Dolan looks at a case in which the peak doesn't seem to belong with the neighboring peaks in the chromatogram.

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

This is John Dolan's 300th "LC Troubleshooting" column. Here, he takes a look through the archives.

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

John Dolan reaches a milestone with his 300th installment of "LC Troubleshooting" and takes a look back through the years.

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