Table 1.

Antioxidant activity of Turnera spp. evaluated using free radical-based methods.

Method	Species	Part of the Plant	Extract/Compound	% Inh.	EC50 (µg/mL)	Ref.
ABTS	T. diffusa	H	HA	-	381.2	[20]
		H, T	AQ	60.8–72.3	-	[15]
		H, T	HA	30	-	[11]
	T. subulata	C	AE	-	250	[21]
		C	CH	-	415	[21]
		C	E	-	250	[21]
		C	HX	-	93.7	[21]
		C	M	-	500	[21]
		C	PE	-	450	[21]
DPPH	T. diffusa	A	Fr. AE:M	-	26.9–90.3	[22]
		A	Hepatodamianol	-	4.7	[22]
		H	E	36.2	-	[23]
		H	HA	-	305.4	[20]
		H	M	-	28.9	[19]
		H, T	A	77.9–78.1	-	[7]
		H, T	HA	78.6–77.8	-	[7]
		H, T	HA	62	-	[12]
		H, T	HA	76	-	[11]
	T. ulmifolia	C	AE	-	847.3	[21]
		C	CH	-	45.6	[21]
		C	E	-	10.2	[21]
		C	HX	-	991.6	[21]
		C	M	-	10.4	[21]
		C	PE	-	358	[21]
		CL	E	12.5–53.2	-	[14]
		CL	M	15.2–56.2	-	[14]
		F	E	-	25.4	[24]
		H, R, F	HA	70.6	-	[25]
H2O2	T. subulata	C	AE	-	120	[21]
		C	CH	-	91.2	[21]
		C	E	-	106.2	[21]
		C	HX	-	102	[21]
		C	M	-	25	[21]
		C	PE	-	425	[21]
NO	T. subulata	C	AE	-	31.9	[21]
		C	CH	-	24.6	[21]
		C	E	-	36.1	[21]
		C	HX	-	111	[21]
		C	M	-	25.1	[21]
		C	PE	-	338	[21]
OH•	T. subulata	C	AE	-	24.4	[21]
		C	CH	-	23.7	[21]
		C	E	-	21.8	[21]
		C	HX	-	30.8	[21]
		C	M	-	120	[21]
		C	PE	-	42.5	[21]
β-carotene bleaching assay	T. diffusa	H	M	-	233.1	[19]

Ref.: reference. A: aerial. H: leaf. C: whole plant. CL: callus. T: stem. R: root. F: flower. FR: fruit. M: methanol. HX: hexane. CH: chloroform. AE: ethyl acetate. E: ethanol. HA: hydroalcoholic. PE: petroleum ether. EO: essential oil. AQ: aqueous. % Inh: inhibition percentage. EC: effective concentration. (-): not reported.