Nexera UC Chiral CCA, 3 Micron, 3.0 x 50 mm The Nexera UC Chiral CCA column consists of a polysaccharide coated chiral stationary phase, tris-(3,5-di- methylphenyl) carbamoyl amylose, on high purity silica gel. Similar in selectivity to ChiralPakĀ® AD. Nexera UC Chiral CCA columns can be used for both HPLC and SFC applications.