How can I make purification of hard-to-separate compounds greener?

The planet’s population is growing, its resources are dwindling – this is a problem.  On top of that environmental contamination from myriad sources is only compounding the issue of available clean food and water.

As chemists, we contribute to this issue, to some degree, by performing reactions that generate chemical waste in the form of unwanted by-products and excess solvents from work-up and purification. What can we, as chemists, do to help reduce our so-called “carbon footprint”?

In this post, I discuss some ways to improve flash chromatography resource utilization, especially for hard separations.
Continue reading How can I make purification of hard-to-separate compounds greener?

How to efficiently scale-up flash column chromatography

For synthesis and medicinal chemists, compounds are typically made only once en route to a final product. Once that compound shows activity toward a particular target, then the synthesis is scaled up meaning that purification too requires scaling. The same is true in natural product research where once a high-value compound is isolated at small scale, there is a need to isolate it at larger scale.

Both of these scenarios can be problematic to scale-up/ process chemists when other, non-chromatographic purification techniques are not successful. When this happens, either a different synthetic route or extraction process is needed or large scale chromatography is employed. In this post, I will explain how flash chromatography can be successfully scaled while minimizing time and solvent consumption. Continue reading How to efficiently scale-up flash column chromatography

How can I rapidly remediate THC from CBD in my hemp extract using flash column chromatography?

Tetrahydrocannabinol, aka THC, is a hallucinogen found in cannabis and, to a lesser degree, in hemp.  Though THC is legal in some locations in the US and Canada, there is a growing market for its non-hallucinogenic cousin, cannabidiol (CBD), which has purported medical benefits.

The problem with isolating CBD from cannabis and hemp is contamination from THC, which is typically present at a moderate to high percentage. In this post, I will provide some insight into rapidly purifying CBD to remove THC. Continue reading How can I rapidly remediate THC from CBD in my hemp extract using flash column chromatography?