摘要：In Vitro antioxidant activity of four sea weeds from North Sulawesi –viz ., Gracillaria salicornia, Sargasum olygocystum, Turbinaria decurens, Halimeda macroloba and H. durvilae were evaluated. Total phenol content (TPC) and activity antioxidant of 30%,50%, 70% aqueous were study. TPC using follin Ciocalteu method, while 1,1-diphenyl-2pycrylhydrazyl (DPPH) radical scavenging, Ferric reducing Antioxidant Power (FRAP) and ferrous ion Chelating (FIC) assay were used to study their AOC(Antioxidant Capacity) . The total phenol content of different metanol concentration of sea weed varied from 3.02±0.68% to 18.83±0.77 g gallic acid equivalent (GAE) per 100 gr dried sample, All sea weed were determined to have highest TPC, DPPH and FRAP in 70 % aqueous metanol . H durvilae displayed highest in TPC and DPPH. G.salicornia showed highst in FRAP. 42.95±2.24 g GAE/100 g ekstrak. Brown alga T. decurens and S. olygocystum have FIC activity higher then another seaweeds in 30% metanol consentration.
