Effects of the Aqueous Extract from Tabebuia roseoalba and Phenolic Acids on Hyperuricemia and Inflammation

Table 1

Antioxidant activity and total phenolic content of aqueous extract of leaves from Tabebuia roseoalba (AEL) and positive controls using DPPH, ABTS, β-carotene, and Folin assays.

Sample	Tests
	Folin; mgGAE/g		DPPH			ABTS				β-Carotene
AEL	23.65		AA% (100.0 µg/mL)	IC50  (µg/mL)		AA% (40.0 µg/mL)	IC50  (µg/mL)	ACET  (mean ± S.D.)		AA% (40.0 µg/mL)	IC50  (µg/mL)
			51	96.03 ± 3.93		88	20.34 ± 1.59	1.43 ± 0.08		81	12.24 ± 3.65
Positive controls			IC50  (µg/mL)			IC50  (µg/mL)		ACET  (mean ± S.D.)		IC50  (µg/mL)
Quercetin			8.40 ± 0.05			1.61 ± 0.04		0.10 ± 0.01		0.49 ± 0.04
Trolox			15.62 ± 0.31			6.24 ± 0.16		—		1.86 ± 0.02

/g gallic acid equivalent, values are means of triplicate determinations; /mL of extract/control equivalent to 1000 µM of trolox. EEL: ethanolic extract of leaves. GAE: gallic acid.