Abstract
Steam-exploded lignin (SEL) was separated from cornstalk residue, which came from steam-exploded cornstalk after enzymatic hydrolysis. There are two methods to acquire SEL, the alkali solution and the organic solvent method. SEL was analyzed with respect to the elementary composition, molecular weight, IR spectrum, and 13C NMR spectra. The C9-formula of SEL was calculated from the experiment data. According to 13C NMR, SEL can be classified as a “GSH” type of lignin, and it is composed mainly of β-O-4 ether bonds together with β-5 and β-1 carbon-carbon linkages between the lignin structural units.
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