A homogeneous enzymatic colorimetric assay is a type of biochemical assay that uses enzymes to catalyze a reaction that produces a measurable color change. In this assay, all of the reactants and products are in solution, and there is no need to separate the enzyme from the reaction products. The assay is typically performed in a microplate or cuvette and is used to detect the presence or concentration of a specific biomolecule or analyte in a sample. The color change is usually detected using a spectrophotometer or colorimeter, and the intensity of the color is proportional to the concentration of the analyte in the sample. Homogeneous enzymatic colorimetric assays are widely used in biomedical research, clinical diagnostics, and drug discovery.