Guard Column Definition

In ► high-pressure liquid chromatography, this guard column is a short column (typically 1-5 cm), normally packed with the same stationary phase as the analytical column, and placed immediately before the analytical column. It serves two main purposes: first as a filter to remove any fine particulate material from the mobile phase before it reaches the analytical column and second to pre-saturate the mobile phase before it reaches the analytical column, thus protecting the analytical column from dissolving.

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Anxiety and Depression 101

Anxiety and Depression 101

Everything you ever wanted to know about. We have been discussing depression and anxiety and how different information that is out on the market only seems to target one particular cure for these two common conditions that seem to walk hand in hand.

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