Characteristics of Liquid Product of Alkaline Treated Sargassum polycystum C.A. Agardh. from Lange Beach, Aceh

Sargassum is known to have potential ingredient s, such as essential nutrients and minerals , which are important for agroindustry and the environment . This study aims to determine the proximate propertie s of  Sargassum polycystum  C.A. Agardh from Lange beach and the optimum extraction period arising the liquid product. The dried seaweed was extracted using 0.1% KOH at a constant temperature of 80°C for 120 – 600 mins. Furthermore, nutrients content , pH, electrical conductivity (EC ) and total dissolved solids (TDS) of the afforded filtrate w ere quantified. As a result, the moisture, ash, fibre, carbohydrate, protein, and fat content were 7.16, 13.057, 20.33, 51.77, 6.12, and 1.57%, respectively. The value of pH, EC, and TDS ranged around 4.69–7.27, 0.013–0.078 dS.m -1 , and 6.24–39.75 mg.L -1 , respectively. The level of N, P, K, and organic C, were estimated around 0.30–0.81, 0.16–0.28, 0.15–0.20, and 0.32–0.80%, respectively. Meanwhile, the content of Na, Mg, Ca, Fe, Mn, and Zn were observed from 112.04–212.61, 24.60–33.57, 146.59–280.92, 416.22–630.69, 18.25–27.73, and 19.86–26.53 ppm, respectively. In conclusion , extraction for 120 mins seems to be preferable , as the observed parameters were above the minimum range.