Microfluidic process for treating and analysing a solution containing a biological material and corresponding microfluidic circuit

A microfluidic circuit, wherein microchannels suitable for containing fluids are defined, said circuit comprising at least one device for forming a plurality of drops of a solution in a carrier fluid, and at least one storage zone for storing drops produced by said microfluidic circuit;

• wherein said at least one device for forming drops further comprises said microchannels, wherein each of said microchannels comprise microchannel walls, said microchannel walls comprising diverging wall portions diverge, to detach drops of said solution under the effect of the surface tension of said solution to form said plurality of drops;
• wherein said storage zone comprises an upper surface, a lower surface and storage zone walls, wherein each said storage zone wall comprises a rectangular shaped step;
• wherein said at least one device for forming drops opens onto said step of said at least one storage zone,
• wherein said diverging wall portions of said microchannel walls causes at least a portion of said plurality of drops to move to said at least one storage zone;
• wherein the dimensions of said at least one storage zone are adapted to the dimensions and the quantity of the drops contained in said portion to concentrate said portion of drops;
• wherein said upper surface and lower surface are spaced further from each other than said microchannel walls.