Abstract: A method for separating a chemical or biological compound present in a mixture of similar compounds by diffusion in a medium, the method comprising reacting the compounds of the mixture with a component (P) present in the medium to obtain products (Qi), wherein the reactions Ci+P?Qi are reversible and have kinetic constants k1 and k2, and applying to the medium a varying field to which the compounds are sensitive, wherein the period of the field and the concentration of component (P) in the medium are determined from the kinetic constants (k1,k2) of the compound (C) to be separated in order to establish resonance condition between said reactions and the field and for giving compound C an apparent diffusion coefficient (Da) in the medium that is maximum.

Abstract: A method for separating a chemical or biological compound present in a mixture of similar compounds by diffusion in a medium, the method comprising (i) introducing a mixture of compounds into said medium (ii) reacting the compounds (Ci) of the mixture in the medium with a component (P) present in the medium to obtain products (Qi), wherein the reactions Ci+P→Qi are reversible and have kinetic constants k1,I in the direction of production of products (Qi) and (k2,i) in the reverse direction; and (iii) applying to the medium a field that varies periodically with time and to which compounds (Ci) are sensitive, wherein the period of the field and the concentration of component (P) in the medium are determined as a function of the kinetic constants (k1,k2) of the compound (C) to be separated to establish resonance condition between said reactions and the field, for which compound C has an apparent diffusion coefficient (Da) in the medium that is a maximum value.