| abstract |
One, two or more channels (101; 201a, b; 301a, a ', b), all of which are porous beds I (104, 204, 304) common to all channels And a microfluidic device comprising a microchannel structure, wherein the porous bed has a fixed reactant R that can interact with the solute S passing through the bed. At least one of the flow paths (101; 201a; 301a, a ′) is arranged upstream of the porous bed I (104, 204, 304) and becomes a dummy in the action on the solute S, but the liquid accompanied by the solute S. A second porous bed II (105, 205, 305) that can act with the substance DS that is present in the aliquot and can interfere with the results of the action between the solute S and the immobilized reactant R. Also described are devices and variations on devices in which the immobilized R is replaced by a porous bed II that exhibits a generic affinity ligand L I and / or a generic ligand L II different from L I. |