Viva columns are based on a wide pore material we designed for optimal large-molecule separations. In developing Viva silica, we found that although many commercial wide-pore silicas meet the standard 300 Å mean pore size, most have very broad distributions about this mean, with a significant portion of their pore volume falling below 150 Å. This means a large portion of the surface area is unavailable to larger molecules. Viva columns have a narrow distribution around the mean pore size, permitting a larger portion of the silica surface to play a role in the separation.
Base-deactivated, wide-pore packing exhibits excellent peak shape for a wide range of compounds. Less retention in reversed-phase assays than Viva C18 or Viva C8.
Stationary Phase Category: C4, butylsilane (L26)
Ligand Type: monomeric C4
Particle: 5 µm, spherical
Pore Size: 300 Å
Carbon Load: 3.5%
End-Cap: yes
Surface Area: 100 m2/g
pH Range: 2.5 to 8
Maximum Temperature: 80 °C
