Table 4.

IC₅₀ values (in µg/mL) obtained from the free radical scavenging assays with ascorbic acid and the Enteromorpha intestinalis extracts.

Assay	Ascorbic Acid	MEEI	EEEI	HEEI
DPPH• scavenging activity	2.62 ± 0.23	0.50 ± 0.01 **	3.38 ± 0.57 *	3.68 ± 0.98 *
H2O2 scavenging activity	3.13 ± 0.87	4.72 ± 0.67 *	3.22 ± 0.68 *	18.41 ± 1.78 **
Hydroxyl radical scavenging activity	2.26 ± 0.22	0.32 ± 0.01 **	2.58 ± 0.11 *	2.68 ± 0.87 *
Superoxide scavenging activity	2.26 ± 0.67	2.49 ± 0.32 *	2.73 ± 0.16 *	3.69 ± 0.73 *

Relative levels of significance were determined by comparing the extracts to ascorbic acid.