Studies on the Test of Remaining Fat on the Tablewares

At present, oil red, yellow AB, OB, etc. are used as the staining reagents for detection of remaining fat on the tablewares. But recetly, some plastic tablewares have been used in mass feeding, and some of them are stained by these reagents. Therefore, some other reagent, by which only fat can stained, has been desired. It was found that, by using 0.1% ethanol solution of curcumin, only fat was stained without dyeing tablewares, and that fat could be detected very sensetively by yellowish green fluorescence under UV light. This reagent was applied for detection of fat and the results were compared with that of oil red. From the results of experiments, curcumin was found to be a more favorable reagent for detection of remaining fat.