Method for purifying prpres from a biological sample and applications

Abstract

The invention concerns a method for purifying PrPres from a biological sample to be used for qualitative and/or quantitative determination of the PrPres in said sample. The method essentially consists in: (1) incubating, during 30 seconds to 2 hours, at a temperature less than 80° C., said biological sample with a buffer solution A comprising at least a surfactant in an amount ranging between a quarter and four times the weight of the biological sample and optionally a protease, to form a suspension S ; (2) adding to said suspension S resulting from (1) a buffer solution B in an amount sufficient for thinning said suspension, which buffer solution B consists of a solvent or mixture of solvents, which does not solubilize the PrPres and has a constant dielectric ranging between 10 and 25; (3) centrifuging the suspension S resulting from step (2); and (4) solubilizing said pellet in a buffer solution C comprising at least a surfactant and/or at least a chaotropic agent, at a temperature ranging between room temperature and 100° C.