Whatman UniPrep Syringeless Filters
Manufacturer: Cytiva
UniPrep™ Syringeless Filters are preassembled filtration devices for the filtration and storage of laboratory samples. These devices are quick and easy to use and feature a plunger, filter and vial in one unit. They replace syringe-coupled filtration devices with single, disposable units. UniPrep devices consist of two parts: a test tube and a filter-plunger. The design incorporates a prefilter and a membrane into the tip of the plunger. When the filter plunger is pressed through the liquid placed in the test tube, positive pressure forces the filtrate up into the reservoir of the filter-plunger. The UniPrep Syringeless Filter is selected based on compatibility with the sample in use. A UniPrep stand is employed to hold the 5mL capacity test tube into which the sample to be filtered has been poured. In manual operation, the filter-plunger, after the tip comes in contact with the liquid, is slowly pushed into the test tube until it stops at the bottom. The UniPrep is emptied either by decanting into a sample or autosampler vial or by drawing the filtered sample into a syringe for manual injection into an instrument. UniPrep membranes are available for various applications: GMF membrane is a layered glass microfiber depth filter for use with samples containing aqueous organic solvents, NYL (Nylon) is a naturally hydrophilic membrane for filtration of samples containing aqueous or organic solvents with a pH range of 3-10, PTFE is a chemically inert PTFE membrane for filtration of samples containing > 50% organic solvent, PVDF is a low protein binding membrane for filtration of samples with aqueous or aqueous/organic solvent composition