FRAP assay was carried out according to the method of Benzie and Strain [40] to characterize the antioxidant capacity of rosehip samples. This procedure is based on the reduction of ferric-tripyridyltriazine (Fe3+-TPTZ) complex to the ferrous (Fe2+) form at low pH. Samples containing 100 µL of rosehip extract and 3 mL of FRAP solution were incubated at 37 ◦C for 4 min, then their absorbance was measured at 593 nm. Change in the absorbance compared to that of the standard solution of L-ascorbic acid (AA) was converted into a FRAP value, and the result was expressed as mmol AA per g DW.