Polymerization of lignosulfonates by the laccase-HBT (1-hydroxybenzotriazole) system improves dispersibility

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• 作者：Endry Nugroho Prasetyo ; Tukayi Kudanga ; Lars Ø ; stergaard ; Jorge Rencoret ; Ana Gutié ; rrez ; José ; C. del Rí ; o ; J. Ignacio Santos ; Lidia Nieto ; Jesú ; s Jimé ; nez-Barbero ; Angel T. M
• 关键词：Calcium lignosulfonates ; Laccase ; Enzymatic modification ; Dispersion ; Polymerization
• 刊名：Bioresource Technology
• 出版年：2010
• 出版时间：July 2010
• 年：2010
• 卷：101
• 期：14
• 页码：5054-5062
• 全文大小：1124 K

文摘

The ability of laccases from Trametes villosa (TvL), Myceliophthora thermophila (MtL), Trametes hirsuta (ThL) and Bacillus subtilis (BsL) to improve the dispersion properties of calcium lignosulfonates 398 in the presence of HBT as a mediator was investigated. Size exclusion chromatography showed an extensive increase in molecular weight of the samples incubated with TvL and ThL by 107 % and 572 % from 28400 Da after 17 h of incubation, respectively. Interestingly, FTIR spectroscopy, ¹³C NMR and Py-GC/MS analysis of the treated samples suggested no substantial changes in the aromatic signal of the lignosulfonates, a good indication of the ability of TvL/ThL-HBT systems to limit their effect on functional groups without degrading the lignin backbone. Further, the enzymatic treatments led to a general increase in the dispersion properties, indeed a welcome development for its application in polymer blends.