The ULTRON ES series consists of columns designed specifically for chiral separations that employ chemically immobilized protein (ULTRON ES-OVM, ULTRON ES-PEPSIN, ULTRON ES-BSA) and cyclodextrin (ULTRON ES-CD, ULTRON ES-PhCD) stationary phases.

The packing material used in these columns consists of a stable; highly denaturation resistant acidic glycoprotein (ovomucoid) covalently bonded to aminopropyl silica gel particles (5 μm). These columns are mainly designed for separations of the optical isomers of compounds consisting of aromatic rings possessing basic and acidic substituents under reversed phase analytical conditions.