Esterification of Tamarind Starch in Ionic Liquid and Developing Starch Based Films
Gyanendra SHARMA1, Samata TOMOHIRO1, Naoki WADA1, Kenji TAKAHASHI1
1kanazawa University, kanazawa, Japan
Esterification of Tamarind Starch in Ionic Liquid and Developing Starch Based Films
Gyanendra Sharma, Samata Tomohiro, Naoki Wada, Kenji Takahashi*
Faculty of Biological Science and Technology, Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa,
920-1192, Japan
Email: sharmag-19@staff.kanazawa-u.ac.jp, ktkenji@staff.kanazawa-u.ac.jp
Ionic liquids have been used in many different applications and known as designer solvent for their specific properties. To further exploring the potential of their uses in this study, we have used ionic liquid, more specifically 1-ethyl-3-methylimidazolium acetate as reaction medium which does not only help to dissolve the tamarind starch but also work as catalyst for the esterification of starch. In more detail, the tamarind starch was modified with acetyl, propynyl and butyryl groups at three different degrees of substitution (DS). The obtained esterified tamarind starch was characterized by using 1H NMR and FT-IR. These products were aimed to use as bioplastic materials for different applications, keeping that in center solubility of derivatized starch and the relative physicochemical properties like thermal decomposition temperature, flow starting temperature and melting temperature was analyzed. It was found that in many cases, melting temperature was not suitable to develop hot press film due to that we have chosen biodegradable and environmentally friendly plasticizer to reduce the processing temperature. At the later stage derivatized tamarind starch was dissolved in appropriate solvent and film was developed by casting method. The results of developed films were compared, and a systematic understanding was developed based on different alkyl chain length of modified starch.
This work is funded by the Japan Science and Technology Agency (JST) (grant number JPMJPF2102)
and the Japan Society for the Promotion of Science (JSPS) KAKENHI (grant numbers 18H02253 and 22H02404)