This short review outlines ultrafiltration of various biological nanoparticles and medical nanocarriers. Here, ultrafiltration is used to purify, concentrate and separate nanoparticles from substrates. The nanomaterials discussed comprise metals, polymers, lipids (in vesicles and micelles) and proteins. Guidance is provided for selection of the ideal performing ultrafiltration devices with the optimum molecular weight cutoff (MWCO) for these typical applications and materials. Download the available document to learn more.