NEUROSYIL C4 HPLC columns (200 Å pore size) are mainly chosen for large, hydrophobic biomolecules where smaller-pore columns (like 80–120 Å) would restrict access.
C4 (butyl) bonded phase → lower hydrophobicity than C8 or C18
200 Å pore size → optimized for large molecular weight compounds
NEUROSYIL silica → high-purity silica, good peak shape and reproducibility.