The Properties of Xylan Extracted from Corncob Using Deep Eutectic Solvent

Author:

Agustinisari Iceu,Herawati Heny,Widaningrum ,Hernani ,Harimurti Niken,Rienoviar ,Hermiati Euis,Sunarmani ,Zahrina Ida

Abstract

Abstract Corncob is an abundant agricultural biomass that is generally underutilized and discarded. It has potential to be a resource for high-value products due to its cellulose and hemicellulose content. Xylan, which is the primary constituent of hemicellulose, can serve as a raw material or intermediary in both non-food and food industry. This research aims to study the extraction of xylan from corncob using deep eutectic solvent (DES) for clean processing and analyzes the characteristics of corncob xylan. DES comprises choline chloride and acetic acid with a molar ratio of 1:2. Xylan was extracted from corncobs by immersion in aqueous DES (70% and 90%) and heating using an autoclave at 105°C for 15 minutes. FT-IR and NMR characterized the chemical structures of xylan, while FE-SEM observed the surface. The FT-IR result showed that xylan had a peak range of 1041 cm−1, which is attributed to the glycosidic bond. A delignification process seems to have occurred as indicated by the absorption peak at 1475-1477 cm−1, indicating the presence of lignin in xylan and solid residue. Both types of extracted xylan had similar NMR spectra in the 3-4.3 ppm range, which indicates that they contained xylose. The solid residue structure obtained from extracting two DES concentrations shows the difference in the extraction process. However, the surface morphology of the two types of extracted xylan had a similar irregular shape and roughness. The use of the DES choline chloride-acetic acid could lead to the extraction and separation of xylan from lignocellulosic corncob.

Publisher

IOP Publishing

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