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영어

Lignin, the second most abundant natural compound after cellulose, is a high-molecular weight polymer of phenolic compounds that occurs naturally in plants. On the other hand, lignin is only used by fuel of pulp and paper production process. Many researchers have made efforts on a variety of applications of lignin. In this work, we conducted experiments on the ultraviolet blocking and antioxidant effect of many kinds of commercially available lignin: lignosulfonic
acid (sodium salt), lignosulfonic acid (calcium salt), lignin alkali, lignin alkali (low sulfonate content), and organosolv lignin. In order to improve the lignin properties, lignin was degraded by acidolysis and derivatization followed by reductive cleavage (DFRC) method. We have examined ultraviolet absorption ability using an UV-Visible spectrophotometer. The absorbance of lignin samples was measured at 280 nm, 300 nm, and 340 nm. As a result, organosolv lignin showed
the highest absorbance of the tested commercial lignin. In addition, we carried out DPPH (2,2-diphenyl-1-picrylhydrazyl) assay and Folin-Ciocalteu (FC) assay in order to examine antioxidant properties of lignin. The results of two different assays have been compared.