Trockenes analytisches Element und Verfahren für dessen Produktion.

摘要

A dry analytical element for use in detecting a specific component contained in a liquid, which element comprises one or more water permeable layers provided on a water impermeable support, at least one layer of the water-permeable layers containing a composition capable of interacting with said specific component contained in said liquid. The composition contains a leuco dye and a dispersion containing said leuco dye is incorporated in the water-permeable layer, which is formed by dissolving the leuco dye in a hydrophobic solvent containing an aliphatic higher alcohol and dispersing the resulting solution in a hydrophilic medium. The leuco dye has the formula: wherein R<1> represents an unsubstituted or substituted aryl group, R<2> represents an unsubstituted or substituted alkyl group, and R<3> represents an unsubstituted or substituted aryl group. A process for producing said dry analytical element is also disclosed.