eneration of ROS. The dichlorofluorescein (DCF) assay was used to assess the extent of ROS generation following UVA or UVB exposure (41). SKU-1064 human skin fibroblast cells (2 × 104/mL) were seeded in a 96 well plate and incubated for 24 h. Following UV exposure for 1 min, cells were washed twice with phosphate buffer saline (PBS) and incubated with various concentrations (0-10000 mg/ L) of pomegranate polyphenolic extracts for 3 h. Cells were then washed with PBS and preloaded with DCF diacetate (DCFH-DA) substrate by incubating with 10 µM DCFH-DA for 30 min at 37 °C. Fluorescence was determined after 30 min of incubation with polyphenolics using a BMG Labtech FLUOstar fluorescent microplate reader (485 nm excitation and 538 nm emission, BMG Labtech Inc., Durham, NC).