Characteristics of Green Seaweeds from Seribu Islands and Sekotong West Nusa Tenggara Antioxidant

Abstract

Green seaweeds contain many bioactive compounds which one of them act as antioxidants as well as rich in fibers and essential minerals. This study was aimed to determine physicochemicals properties of Caulerpa lentillifera, Halimeda opuntia and Ulva lactuca and as well as their antioxidant activities. Research consists of proximate analysis, mineral composition, phytochemical compounds, heavy metal content and antioxidant activity of extract green seaweed by CUPRAC, DPPH and FRAP method. The results of the study macronutrient analysis shows the moisture content ranged from 10.83% to 28.41%, ash 24.97% to 70.66%, fat 3.80% to 5.26%, fiber 2.63% to 3.86%, protein 0.18% to 1.43% and carbohydrate 10.69% to 36.49%. Mineral Ca C. lentillifera, H. opuntia and U.  lactuca about 17, 95-124,39 g/kg, Fe 0,13-0,34 g/kg, K 2,29-12,28 g/kg, Mg 2.63-22.23 g/kg and Na 21.16-34.18 g/kg. The heavy metals content of C. lentillifera, H. opuntia and U.  lactuca ranged in Pb 13.57 mg/kg to 37.76 mg/kg, Cu 5.02 mg/kg to 8.32 mg/kg and Hg 0.170 mg/kg to 0.265 mg/kg. Phytochemicals properties of C. lentillifera, H. opuntia and U.  lactuca were alkaloids, flavonoids, phenols hydroquinone, saponins, steroids and triterpenoids. Antioxidant activity of ethanol extract DPPH showed IC50 values ranged from 1.6–4 445 mg /L, CUPRAC 138.21–212.43 μmol trolox/g extract, FRAP 175.93–181.79 μmol trolox/g extract.