Development of a Hybrid Chitosan- and Niacinamide-Coupled ZnO Nanoparticle Composite for Sun Protection Application

Figure 6

Concentrations of tyrosinase inhibitory activity of Nia/ZnO and arbutin. Arbutin was used as the positive control of Nia/ZnO. When concentration increased, the samples were not dissolved, which led to the measurement value being significantly lower than that of the positive control.