Sintesis Pati Sulfat dari Pati Ubi Kayu (Manihot esculenta) Menggunakan Asam Sulfamat-Urea dalam Pelarut DMSO

Abstract

This study examines the Synthesis of Sulfate Starch from Cassava Starch (Manihot Esculenta) using Sulfuric Acid-Urea in DMSO Solvent. This research was carried out in two stages, namely, the isolation of cassava starch and the sulfation reaction with sulfamic acid in DMSO solvent with a comparison of sulfaic acid:urea molar variation (1:1, 1:2, 1:3). An FT-IR test analysis of the molar variation of sulfuric acid:urea obtained optimal results on the molar variation of sulfuric acid:urea (1:2) which showed a wave number of 1207.6 cm-1 vibration stretching group S=O. The determination of the best condition of the sample treatment can be determined by the value of the degree of substitution resulting from the sulfur content in the sulfate starch. Sulfate starch which has the highest degree of substitution was obtained with a molar ratio of 1:2 with a DS value of 1.02 and a sulfur content value of 12.32%. SEM morphological analysis of the optimum variation of sulfuric acid:urea mole at the variation (1:2), where the morphology of the granules of sulfate starch fibers which were initially fine became amorphous surfaces caused by heating during the sulfation reaction compared to natural starches.