The melan-a cells were distributed in a 48-well plate (2 × 104 cells/well) and grown in the incubator at 37°C and 10% CO2 for 24 hr. Following incubation, 500 μL of RNEE and RVEE diluted with RPMI-1640 medium to a range of concentrations (25, 50, 100, and 200 μg/mL) were added to the wells and the cells were grown in the incubator at 37°C and 10% CO2 for 72 hr, and then washed. The same treatment was repeated once more. Next, melanin was dissolved in 1 N NaOH, and the absorbance was measured at 490 nm using a plate reader.
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