Sintesis Natrium Pati Sulfat dari Pati Ubi Kayu (Manihot esculenta) Menggunakan Asam Sulfat dalam Pelarut Etanol

Abstract

Sodium starch sulfate was obtained from cassava starch (Manihot esculenta), which was synthesized through the sulfation reaction using 98% H2SO4 in ethanol solvent. This research was conducted in two stages, namely, isolation of cassava starch and sulfation reaction with sulfuric acid in ethanol solvent at variations of ethanol solvent volume of 10 mL, 15 mL, and 20 mL and neutralization with 40% NaOH. The formation of sodium starch sulfate is supported by the FT-IR spectrophotometer, which shows that in the wave number region 1244.9 cm-1 and 1103.3 cm-1 is stretching vibration of the S=O group. The results of the determination of the highest degree of substitution (DS) of sodium starch sulfate was determined to determine the sulfur content obtained in the variation of the ethanol solvent volume of 20 mL, which amounted to 1.355. The results of SEM morphological analysis showed that the surface of sodium starch sulfate granules was rougher and irregular than natural starch. Electrical conductivity test showed higher current strength in ethanol solvent variation of 20 mL.