Dishwashing liquid having bleaching catalyst and protease

Abstract

In a dishwashing liquid, the cleaning performance, in particular on bleachable stains such as, for example, tea stains, is to be improved. This succeeds using a dishwashing liquid which comprises a hydrogen peroxide source, a bleaching catalyst and a protease that, in native electrophoresis on a polyacrylamide gel, has a migration distance that is longer than the migration distance of the protease as per SEQ ID NO. 1.

What is claimed is: 
     
         1 . A dishwashing agent comprising a hydrogen peroxide source, a bleach catalyst and a protease, wherein the protease in a native electrophoresis in a polyacrylamide gel has a migration distance that is longer than the migration distance of the protease according to SEQ ID NO: 1. 
     
     
         2 . The dishwashing agent according to  claim 1 , wherein the bleach catalyst is selected from the group consisting of bleach boosting transition metal salts and transition metal complexes, and the hydrogen peroxide source is selected from sodium percarbonate, sodium perborate tetrahydrate or sodium perborate monohydrate or a combination hereof. 
     
     
         3 . The dishwashing agent according to  claim 1  wherein it comprises the protease in an amount of 1×10 8 -10 wt %, based on the total protein content of the protease, the bleach catalyst in an amount of 0.0025-1 wt %, and the hydrogen peroxide source in an amount of 2-30 wt %. 
     
     
         4 . The dishwashing agent according to  claim 1 , further comprising a bleach activator in an amount of 0.1-10 wt %. 
     
     
         5 . The dishwashing agent according to one of  claims 1  to  4 , wherein:
 a. the calculated iso electric point of the protease is greater than 9.3; 
 b. the calculated net charge of the protease is greater than 3.38; and 
 c. the protease comprises an amino acid sequence that is at least 70% identical to the amino acid sequence selected from the group consisting of those listed in SEQ ID NO. 3, SEQ ID NO. 2, and SEQ ID NO. 1. 
 
     
     
         6 . The dishwashing agent according to  claim 1 , wherein it is in solid form, a free flowing powder, a molded article, a liquid, a gel or a paste. 
     
     
         7 . The dishwashing agent according to  claim 1 , comprising at least one additional ingredient that is selected from the group consisting of builder, surfactant, anionic polymer as well as combinations thereof, and in that it comprises at least one additional enzyme. 
     
     
         8 . A method for removing stains on hard surfaces, comprising one of the procedural steps
 a. contacting the hard surface with a cleaning liquor that comprises a dishwashing agent according to  claim 1 , or   b. contacting the hard surface with a cleaning liquor that comprises a hydrogen peroxide source, a bleach catalyst and a protease, wherein the protease in a native electrophoresis in a polyacrylamide gel has a migration distance that is longer than the migration distance of the protease according to SEQ ID NO: 1.