A device for efficient washing of paper disks for gentamicin or other assay procedures

A new device has been developed for efficient washing of phosphocellulose disks used in enzymatic assays of antibiotics. Its construction and operation are described. The device allows all disks to receive identical washing, including agitation, and the sequence of the disks is maintained. A comparison has been made of the results of adenylation assay of gentamicin using the new device and hand-washing of the paper disks.