Table 3.

Antioxidant activity in various P. speciosa extracts.

Plant part	Extract	Total phenolic content (mg GAE/g)a	DPPH assay (μmol Trolox/g)a	FRAP assay (μmol Trolox/g)a	Total flavonoids (mg RE/g)a	Tannin (mg/g)a	Reference
Pod and seed	Aqueous	1557.6b,c	7418.3b,d	1617.3b,d	—	—	Ayub Ali et al. [32]
Pod and seed	Methanol	2464.3b,c	5936.9b,d	1898.0b,d	—	—	Ayub Ali et al. [32]
Pod	Ethanol	—	—	—	—	250	Tunsaringkarn et al. [5]
Seed	Ethanol	51.9a	—	—	20.3a	—	Maisuthisakul et al. [10]
Seed	Methanol	—	—	—	0	—	Miean and Mohamed [18]
Seed	Methanol	120b,c	40b,e	—	—	—	Tangkanakul et al. [34]
Seed	Aqueous	6.5	67.62	44.67	—	—	Reihani and Azhar [30]
Seed coat	Ethanol	—	—	—	—	350	Tunsaringkarn et al. [5]
Leaf	Ethanol	44.7	89.26f	—	—	—	Tangkanakul et al. [4]
Leaf	Aqueous	22.7	57.4f	—	—	—	Tangkanakul et al. [4]
Leaf	Aqueous	32.73	22.7	49.9	—	—	Wong et al. [33]

^aDry weight basis, ^bfresh weight basis, ^c(mg GAE/100 g), ^d(mg Trolox/100 g), ^e(mg vitamin C equivalent/g), and ^f(mg BHA equivalent/g).