An ultrafiltration assay is a valuable technique used in biochemical and pharmaceutical research to separate and concentrate macromolecules such as proteins, nucleic acids, and antibodies. This method involves passing a solution through a semipermeable membrane that retains larger molecules while allowing smaller molecules and solvents to pass through. Ultrafiltration assays are particularly useful in the purification of biological samples, allowing researchers to analyze specific components with higher accuracy. Additionally, this assay type is employed in drug development processes to study protein binding dynamics and to concentrate therapeutic compounds for further analysis. The precision and efficiency of ultrafiltration assays make them essential tools in laboratory settings, supporting advancements in scientific research and development.