activity of the marine algae G. changii from Malaysia was determined. The free radical scavenging activity of
the 80% methanolic extract of G. changii was assessed with the aid of the stable DPPH (1,1-diphenyl-2-picrylhydrazyl) radical.
The crude extract showed a low free radical scavenging capacities in comparison with commercial antioxidant BHT (butylated
hydroxytoluene), and vitamin E. The IC50 values of the extracts of algae on DPPH scavenging activity was 14.70 mg/ml. The TLCDPPH
study, exhibited only one DPPH radical scavenging bands out 7 major band of the extract and detected with Rf value 0.63. In
order to assess the role of polyphenolic components in the relevant activity, phenolic contents of the extract also determined and the
value was 5.0 mg (gallic acid equivalent/1 g extract). This finding indicated that crude extract of G. changii was a starting material
for the isolation of compound(s) with effective activities as radical’s scavengerฤษถูกหลักไวยากรณ์