Enzymatic Modification of Different Lignins Through Oxidative Coupling with Hydrophilic Compounds. Issue 1 (June 2015)

• Record Type: Journal Article
• Authors: Fiţigău, Ionita Firuta; Boeriu, Carmen Gabriela; Peter, Francisc; Davidescu, Corneliu M.
• Is Part Of: Macromolecular symposia. Volume 352:Issue 1(2015)
• Page Start: 78
• Page End: 86
• Publication Date: 2015-06
• Subjects: Macromolecules -- Congresses; Polymers -- Congresses; Polymerization -- Congresses; Macromolecules -- Periodicals; Polymers -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1002/masy.201400157
• Languages: English
• ISSNs: 1022-1360

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Summary</title> <sec id="masy201400157-sec-0001" sec-type="section"> <p>The enzymatic oxidative coupling of five technical lignins from different sources and with different molecular properties, with glucosamine and the tripeptide glycil‐tyrosyl‐glycine was studied in acetone/water mixture, using laccase as catalyst. The modified lignin was isolated and the product was characterized by means of size exclusion chromatography, FT‐IR and ³¹P‐NMR, in order to evidence the main lignin modifications after laccase coupling reactions. An important increase of the molecular weight and significant structural modifications were observed for the product obtained after the coupling reactions of Organosolv Hardwood Lignin and Alkali pretreated Wheat straw Lignin with glucosamine and glycil‐tyrosyl‐glycine, demonstrating the achievement of the modification reactions.</p> </sec> </abstract>