Deep Eutectic Solvents K2CO3–Ethylene Glycol As Extractor Agent for Sago Bark Waste (Metroxylon sago Rottb. L)

Abstract

Sago starch is a staple food for residents in Luwu Regency, North Luwu Regency, and East Luwu Regency. The increasing demand for sago starch is in line with the deposit of its waste. Unfortunately, sago bark waste has not been widely utilized appropriately. This study utilized a deep eutectic solvent (DES) K₂CO₃-ethylene glycol to extract versatile solvent candidates from sago bark waste. The research stages began with DES synthesis and followed by sample extraction with the help of sonication and DES solvent. DES synthesis was confirmed through FT-IR, while the compounds in the extract were confirmed through GC-MS. DES was successfully synthesized with the presence of characteristic functional groups of K₂CO₃ and ethylene glycol in the solvent functional group. From GC-MS analysis, there was a dioxolane compound with 90% similarity. It is assumed that there is an interaction between the DES constituent (ethylene glycol) and the sago bark constituent. Further research is needed to determine the interaction of DES K₂CO₃-ethylene glycol with other lignocellulosic materials