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 green seaweed Caulerpa lentillifera, Halimeda opuntia and Ulva lactuca. The analitycal methods of this
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
proximate analysis showed that the water content of the three seagrasses ranged from 10.83-28.41%, the ash
ranged from 24.97-70.66%, the fat ranged from 3.80 to 5.26%, the fiber ranged from 2, 63-3.86%, protein
ranges from 0.18 to 1.43% and carbohydrates range from 10.69 to 36.49%. Seaweeds contain Ca minerals
ranging from 17.95-124.39 g / kg, Na ranges from 21.16 to 34.18 g / kg. Mg ranges from 2.63-22.23 g / kg,
K ranges from 2.29-12.28 g / kg and Fe ranges from 0.13-0.34 g / kg. The three seaweeds contain Pb heavy
metals ranging from 13.57-37.76 mg / kg, Cu ranges from 5.02-8.32 mg / kg and Hg ranges from 0.170 to
0.265.. bioactive compound extract C. lentillifera, H. opuntia and U. lactuca contains alkaloids, flavonoids,
phenols hydroquinone, saponins, steroids and triterpenoids. Green seaweeds contain DPPH antioxidant
activity within IC50 values of 43,53-95,91 mg/L, CUPRAC 138.21–212.43 μmol trolox /g, FRAP 175.93–
181.79 μmol trolox/g.
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