The total antioxidant activity was found to be (32.34 ±
1.42) % (Fig. 1). In the present study, the reducing power of
the sulfated polysaccharide increases with increasing concentration
(Fig. 2). The study indicated that the DPPH scavenging
activity for S. swartzii was (25.33 ± 2.52) % (Fig. 3). The
inhibitive effect of the seaweed extract was subjected to a
hydrogen peroxide scavenging assay and was found to be
(47.23 ± 2.81) % (Fig. 4). The ABTS radical reactions involve
electron transfer and the process takes place at a faster
rate when compared to DPPH radicals. In the present study,
the ABTS radical scavenging activity was (55 ± 3.61) % (Fig.