Many of our columns feature aromatic ring-based stationary phases with strong π-π interactions, notably our πNAP (naphthylethyl) and PYE (pyrenylethyl) columns. Several other companies produce similar columns using a biphenyl phase, which has become a popular alternative to C18 in recent years. Here, we compare these columns for several kinds of analysis.

https://www.nacalaiusa.com/products/view/558/application-comparison-of-biphenyl-and-other-aromatic-stationary-phases

The following columns were used in this application.

COSMOSIL piNAP:
https://www.nacalaiusa.com/products/view/107/cosmosil-pi-nap

COSMOSIL PYE:
https://www.nacalaiusa.com/products/view/59/cosmosil-pye-and-cosmosil-npe