Cartridge, apparatus, and method for preparing purified nucleic acids from a cell sample

A cartridge for preparing purified nucleic acids from cells, the cartridge comprising a dialysis enclosure, a filter provided in the dialysis enclosure for separating it into two separate compartments, the filter being in a material adapted for retaining cell nuclei, and inlet and outlet means for admitting and extracting substances into and out from the dialysis enclosure, said enclosure comprising a elongate plane support having a central slot and two outer faces, two dialysis membranes fixed on the outer faces of the support for defining the dialysis enclosure between them, and two end rings mounted on longitudinally opposite ends of the support and each comprising a through duct that opens out into the dialysis enclosure, the through duct of one of the end rings opening out on a side of the filter and the through duct of the other end ring opening out on an opposite side of the filter.