A system for extracting analytes from a biological sample, which includes: an electronic pipette having pipette cones with a tip; a well support; a pipette holder including: a base which can removably house each well support; a pipette support into which the pipette is inserted, and which can move relative to the base between a first position in which the tips of the cones are inserted in a well of the support and at least one second position in which the tips are outside the wells; a housing facing the pipette cones above their tip when the pipette support is in the first position, and facing the tips of the pipette cones when the pipette support is in the second position; and a magnetized part removably inserted in the housing.