Abstract

This study aimed to know the physichochemical characteristic of sodium alginate that was obtained from Sargassum crassifolium,  Sargassum polycystum, Padina sp., andSargassum echinocarpum, which grew on the coral coast of Gunung Kidul Yogyakarta Indonesia. The result showed that the average of the yield was 16.93 to 30.50%. The chemical properties, that is, water, ash, Pb and Hg were 12.50 to 13.43%, 18.20 to 8.59%, 0.083±0.01 to 0.36±0.04 ppm and 0.002±0.01 to 0.3±0.05 ppm. The physical properties such as viscosity and lightness were 25 to 39 cps and 46.2 to 52.3 (the color was yellow to light brown).

Key words: Sodium alginate, psychochemical, characteristic.