Millipore Corporation announces the development of a protocol for efficiently compartmentalizing protein solutions using a combination of Amicon® Ultra centrifugal devices and expertise. The process (fractionation) is for separating a mixture into its component parts to eliminate the complexity of the proteome. A bi-vertical housing limits membrane polarization, while the hydrophilic microstructure of low-binding Ultracel® ultrafiltration membrane enables efficient protein separation. The method expedites the fractionation process by minimizing process steps and confirms the advantage of speed and efficiency. http://www.millipore.com, [email protected]