SDS-PAGE Clean-Up Kit uses a combination of a precipitant and co-precipitant to quantitatively precipitate the sample proteins while leaving interfering substances in solution. Detergents, salts, lipids, phenolics, and nucleic acids remain soluble while the proteins are pelleted by centrifugation. The precipitate is washed further to remove nonprotein contaminants and centrifuged again. The resultant pellet is resuspended, mixed with SDS-PAGE sample buffer, and heated. The sample is then ready for SDS-PAGE. The procedure can be completed in under 2 h with quantitative yield