INCLUSION COMPLEXES BETWEEN STARCH AND OLEIC ACID AS HYDROGEL MATERIALS

• Main Author: NURUL INTAN 10512063, SUCIYATI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31121
• Institution: Institut Teknologi Bandung

<p align="justify">Starch-based hydrogel is a biodegradable and biocompatible material which has a large surface area and is able to absorb water. These materials can be made of starch inclusion complex with a hydrophobic guest molecule. The resulting hydrogel inclusion complexes have advantage as it can prevent the retrogradation of starch in the hydrogel. Inclusion complexes was succesfully prepared by mixing cassava starch and oleic acid at a complexation temperature 85 oC with of varying heating times (1 hour, 2 hours and 5 hours). Optimum result (product yield 67.4%) was obtained by heating the reaction for 5 hours at 85 oC In this study, the concentration of oleic acid were varied at 10%, 20% and 50% (calculated based on the weight of starch). The results showed that the maximum amount of oleic acid which be complexed with starch was around 10%. The resulting product were characterized by Fourier Transform Infra Red (FTIR), X-Ray Diffraction (XRD), Thermogravimetric Analysis (TGA) and Scanning Electon Microscopy (SEM). FTIR results showed vibration peaks at around 3600-3000 cm-1 (-OH), 2900-2800 cm-1 (-CH2), 1300-1200 cm-1 (C-O-C glycosidic bonds) and 1100-1000 cm-1 (C-C and C-O). The XRD results showed that the resulting complex were crystalline and constructed of type of V6-amylose, which was evidenced by appearance of peaks at 2&#952; of 12.84o-13o and 20.05o-21.6o. Some complexes also show diffraction at 2&#952; of 26o and 30o. Characterization used TGA showed the product retrogreted start at 275 oC and 284,51 oC Morphology of the complexes spherulites after resistant starch determination for spherical spherulite shows distinct pores and uneven surface texture. In contrast, the torus-shaped spherulites were degraded with evidence of recrystallization.The complexes can be used to hydrogels, but the separation technique to result in into hydrogel beads need to be improved.<p align="justify">