ABTS˙+and FRAP assays, which are based on a single electron transfer as mechanism of free radical quenching reaction [23], resulted in asimilar trend of antioxidant activities. More specifically, the activities were promoted by a low flow rate of UV treatment but inhibited at a high flow rate. However, contradiction was observed in TPC assay where other phenolic compounds, such as flavonoids, lignins, and tannins, were analyzed as well [23].