Absolute Mag™ Alkyne Magnetic Particles, 0.97 μm (Cat# WHM-J001) are an efficient magnetic matrix to covalently capture CLICK-functionalized proteins by a Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC). These particles are not stable in organic solvents and high urea concentrations. Density: 1.33 g/cm3.