“…Several studies show that flavonoids are concentrated in the mature stage rather than the immature stage [5,25]. Some of the major flavonoids included in OFI peel are quercetin derivatives, isorhamnetin derivatives, and dihydrokaempferol [17,26]. In addition, immature OFI peel contains tannins 10.25 ± 0.10 mg cyaniding equivalent (GAE) per g of dry weight (DW).…”