The present invention relates to an analytical aid, comprising a surface coated at least partially with a hydrophilic coating, wherein the hydrophilic coating contains nanoparticles with silica structure and an average particle size, determined according to DIN ISO 22412: 2008, in the range from 1 to 500 nm. The present invention further relates to a method of production of an analytical aid, comprising a surface coated at least partially with a hydrophilic coating, containing nanoparticles with silica structure and an average particle size, determined according to DIN ISO 22412: 2008, in the range from 1 to 500 nm. The present invention also relates to an analytical aid producible by this method and a sampling device containing the at least partially coated analytical aid described.
