In Vitro Antioxidant, Anti-Inflammatory, and Digestive Enzymes Inhibition Activities of Hydro-Ethanolic Leaf and Bark Extracts of Psychotria densinervia (K. Krause) Verdc

Table 2

IC₅₀ and correlation coefficient (r) of the hydro-ethanolic leaf and bark extracts in DPPH, ABTS assay, and the ferric reducing power activity in the FRAP assay.

Test	Parameters	Inhibitors
		Standard	Bark	Leaf
DPPH	IC50 (μg/ml)	71.98 ± 1.21	115.40 ± 5.97	59.09 ± 6.37^†
	R^2	0.9910	0.9995	0.9898
ABTS	IC50 (μg/ml)	33.48 ± 2.02	354.2 ± 1.97	262.4 ± 4.46^†
	R^2	0.9984	0.9986	0.9937
FRAP	mg CE/g of extract		150.30 ± 0.32	341.73 ± 21.70^†

Data are expressed as mean ± SD, n = 3; significantly different at when compared to standards (ascorbic acid in the DPPH test and catechin in the ABTS test); mg CE/g of extract: milligrams of catechin equivalent per gram of extract. ^† compared to bark extract.