Abstract: An electrophoretic gel elutor and concentrator includes a semi-permeable collecting membrane having a continuously diminishing cross-section terminating in an apex, and a supporting frame of matching configuration. This apparatus is useful in electrophoretic extraction of biological samples which have been previously cut from a separation gel. The apparatus is used with standard electrophoresis equipment including a buffer tank, electrodes, and a power source. Due to the high effective cross-section of the collecting membrane, electrophoretic elution can be carried out quickly and efficiently. Due to the continuously diminishing cross-section to the apex of the collecting membrane, the biological sample is advantageously concentrated and extractions of 99% theoretical yield from a separated gel fragment is possible.