Device and method for extracting nucleic acids

A method for automated extraction of nucleic acid, the method comprising:

• a) mixing at least one substance that lowers the polarity of the aqueous solution or a composition that binds nucleic acid on a solid phase with a lysed biological sample;
• b) drawing a mixture from said a) mixing with a pipette tip, in which a rough or structured material is disposed, and the pipette is filled and emptied several times, in the process of which the liquid moves along the material and the nucleic acid are precipitated on the rough or structured material;
• c) removing the pipette tip from the sample;
• d) immersing the pipette tip in a washing-buffer solution and the pipette is filled and emptied several times, in the process of which the liquid moves along the material;
• e) drying the pipette tip to remove the remaining at least one substance what lowers the polarity of the aqueous solution from the washing buffer;
• and
• f) detaching the nucleic acid with an elution buffer by filling and emptying the pipette several times with the elution buffer, in the process of which the elution buffer moves along the material.