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How do I decide between normal- or reversed-phase flash column chromatography?

December 30, 2019 at 4:49 PM / by Bob Bickler


Choosing a good purification strategy is an important for successful crude compound purification. A major factor in your strategy is choosing between normal-phase or reversed-phase chromatography.  How do you choose?

In this post, I will provide some simple guidance on helping determine which route to take.

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Are there advantages to stacking flash chromatography columns?

December 30, 2019 at 4:38 PM / by Bob Bickler


When it comes to isolating a compound from a mixture at maximum purity there are many options available through flash column chromatography. In previous posts I have addressed using smaller particle media, higher surface area media, and step gradients to achieve this goal.

In this post I will discuss how stacking columns in series may help improve separation quality.

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Are reversed-phase flash chromatography columns designed for aqueous solvents necessary?

December 30, 2019 at 3:54 PM / by Bob Bickler


When it comes to the purification of polar, water-soluble compounds reversed-phase chromatography is the most commonly used approach. However, because of strong stationary phase – mobile phase repulsion forces, the use of highly aqueous (90-100% water) solvent systems has been shown to provide less retention than needed.  This issue has led to the development of “aqueous compatible” reversed-phase media.

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Pushing flash column chromatography loading limits

December 30, 2019 at 3:39 PM / by Bob Bickler


A question I hear a lot from chemists is “how much can I load”. The answer is always “it depends on your separation quality”.  At that point I begin asking about the TLC data and purification goals. Purification goal setting should be your first step and the question to answer is – what do I need this purification to achieve? Is the goal high purity, high yield, or some combination.  Remember, you will typically sacrifice purity for high yield and yield for high purity so optimization is an important consideration.

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