The present invention relates to an extraction process of an unsaponifiable fraction contained in an oil or a vegetable butter, in an oil originating from a micro-organism, in a concentrate of oil or butter or of oil originating from a micro-organism, or in a co-product of the refining industry for vegetable oils, such as deodorization exhaust and distillates of physical refining, or oils originating from micro-organisms, comprising at least: A) a transformation step of said oils, of said butter or said co-product of the refining industry for vegetable oils or oils originating from micro-organisms in hydro-alcoholic solution, especially via a saponification step, and B) an extraction step of the hydro-alcoholic solution in which the fatty fraction is separated from unsaponifiable fraction by liquid/liquid extraction, said process being characterized in that at least the liquid/liquid extraction step of the step B is performed by using a first solvent system comprising a solvent content selected from the solvents comprising at least 5 carbon atoms and one or two oxygen atoms in the form of either ether function, or ketone function, or ester function, of at least 50% in volume relative to the total volume of the first solvent system, as well as fractions obtained by said process.