标题：SINTESIS PATI SAGU IKATAN SILANG FOSFAT BERDERAJAT SUBSTITUSI FOSFAT TINGGI DALAM SUASANA ASAM [Synthesis of Cross-Linked Sago Starch Phosphate with the Highest Degree of Substitution of Phosphate Under Acidic Condition]
出版社：Departemen Ilmu dan Teknologi Pangan, IPB Indonesia bekerjasama dengan PATPI
摘要：Cross-linked sago starch phosphate (SgP) with high phosphorus contents was successfully synthesized by reacting sago with a mixture of primary and secondary sodium phosphates under acidic condition. The experimental variables investigated include pH, temperature, reaction time, and mixture rate . The physicochemical properties evaluated were moisture, swelling power, water binding capacity, transmittance (%T) and percent amylose (%Am ), while t he past ing properties examined were pasting time, pasting temperature, viscosity at peak, final, and setback. The g ranule structure was observed by scanning electron microscope and X-ray diffraction. The results showed that the maximum degree of phosphate substitution was obtained at pH of 6.50, 40 ° C, 20 minutes of reaction time and 300 rpm of mixing rate. The physicochemical (%T and %Am) and past ing (viscosity at peak, final, and setback) properties of SgP were significantly different (P<0.01) from Sg. Structure of SgP was characterized by FT-IR and the results indicated a new absorption peak at 2362.87 cm -1 which was characterized as the phospho-diester (RO-PO 3 -R’) stretching vibration. In the fingerprint area, there were two new absorption peaks at 1242.05 and 989.79 cm -1 which were characterized as the P=O and C-O-P vibration, respectively. Sago granule s were substantially altered after cross-linking.
关键词：sago;modified starch;cross-linked;degree of substitution;Na2HPO4-NaH2PO4
