Weak Cation Exchange (WCX) Supra-Clean Spherical Silica-based Solid Phase Extraction (SPE) columns are recommended for extracting strong basic compounds when analyzing cations, amines, antibiotics, drugs, amino acids, catecholamines, nucleic acid bases, nucleosides, and surfactants. SPE Format: Straight PP TubeMedia Weight: 50 mgFormat Capacity: 1 mLQuantity: 50