Widyaya, Vania Tanda Huyen Thanh Vo Dahnum, Deliana Lee, Hyunjoo 2024-01-20T04:32:33Z 2024-01-20T04:32:33Z 2021-09-05 2016-04 0253-2964 https://pubs.kist.re.kr/handle/201004/124221 Empty fruit bunch (EFB) lignin, which had been isolated by the previous sulfuric acid treatment of EFB, was oxidized in the presence of a base and air to depolymerize the solvent-insoluble lignin into smaller solvent-soluble molecules. Depending on the types of base and solvent, the yield of solvent-soluble lignin (SSL) varied, and the highest yield of 54% was obtained when MgO and ethanol were used at 150 degrees C with an air pressure of 500 psig for 3 h. Gel permeation chromatography analysis of the oxidized lignin showed that SSL had decreased molecular weight compared to native EFB lignin. P-31 NMR experiments revealed that concentrations of hydroxy group and acid group were increased by the oxidation. 2D H-1-C-13 HSQC NMR was performed, and it was found that the area intensities related to methoxy group and -O-4 unit as well as guaiacyl, oxidized syringyl, and p-hydroxybenzoate group were decreased by the oxidation. English WILEY-V C H VERLAG GMBH BIOMASS PYROLYSIS CHEMICALS CHEMISTRY NMR Magnesium Oxide-catalyzed Oxidative Depolymerization of EFB Lignin Article 10.1002/bkcs.10715 1 BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.37, no.4, pp.515 - 521 BULLETIN OF THE KOREAN CHEMICAL SOCIETY 37 4 515 521 scie scopus kci ART002099748 000374009600015 2-s2.0-84962531476 Chemistry, Multidisciplinary Chemistry Article BIOMASS PYROLYSIS CHEMICALS CHEMISTRY NMR Empty fruit bunch lignin Oxidative depolymerization P-31 NMR HSQC NMR