Encapsulation of Urea Derivative Using Starch for Controlled Release Fertilizers (CRF) Application

• Main Author: Surmayanti
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/38132
• Institution: Institut Teknologi Bandung

Fertilizers play important roles in increasing the productivity of agricultures. Some fertilizers are not absorbed by plant. They are washed away by rain, causing inefficiency and polluting the environment. To solve this problem, urea fertilizer can be modified by complexation using cassava starch to result in Controlled Release Fertilizers (CRF). In this case, the starch which complexes the urea molecule will be degraded first, which results in a more controlled release of the nitrogen content in urea. In this study, amylose in starch acts as a host molecule which forms complexes with a guest molecule such as n-hexadecylurea. N- hexadecylurea was synthesized using the alkylation reaction between urea with 1- bromohexadecane. Complexes were prepared by mixing starch (4% w/v) and guest molecule (10% w/w) based on the weight of starch. The FTIR result of starch?n-hexadecylurea showed there were FTIR spectra shift from starch that is absorption hydroxyl functional group (O-H) from 3407 cm-1 to 3314 cm-1, the functional groups C-H from 2925 cm-1 to 2919 cm-1, absorption carbonyl functional group (C=O) from1639 cm-1 to 1640 cm-1 , and shift in peak for absorption C-O-C functional group from 1019 cm-1 to 1009 cm-1. The XRD results on inclusion complexes of starch?n-hexadecylurea showed diffraction peaks at 2 of 13,36° and 30,06° which correspond presence of V6-amylose. The results showed that most of the products are still amorphous. The rate of nitrogen in the form of NH + and NO - are slow compared to pure urea and mixtures of starch?polyethyleneimine. This suggests that the complex formed potentially as a CRF material.