HPLC Columns, Buffers, Reagents, Standards, and Accessories. We offer a wide selection of high-performance liquid chromatography (HPLC, UHPLC, and LC-MS) columns for small and large molecule (biomolecule) analysis, including those employing fully porous particles (FPP) with our Purospher™ STAR, Discovery and Ascentis ® columns, superficially porous particles (SPP), such as Ascentis