Enzyme-Catalyzed Polymerization of Kraft Lignin from : Comparison of Bacterial and Fungal Laccases Efficacy

Overview

Journal Polymers (Basel)

Publisher MDPI

Date 2023 Feb 11

PMID 36771814

Authors

Luisa Garcia-Fuentevilla

Gabriela Dominguez

Raquel Martin-Sampedro

Manuel Hernandez

Maria E Arias

Jose I Santos

David Ibarra

Maria E Eugenio

Affiliations

Soon will be listed here.

Abstract

Kraft lignin, a side-stream from the pulp and paper industry, can be modified by laccases for the synthesis of high added-value products. This work aims to study different laccase sources, including a bacterial laccase from (SiLA) and a fungal laccase from (MtL), for kraft lignin polymerization. To study the influence of some variables in these processes, a central composite design (CCD) with two continuous variables (enzyme concentration and reaction time) and three levels for each variable was used. The prediction of the behavior of the output variables (phenolic content and molecular weight of lignins) were modelled by means of response surface methodology (RSM). Moreover, characterization of lignins was performed by Fourier-transform infrared (FTIR) spectroscopy and different nuclear magnetic resonance (NMR) spectroscopy techniques. In addition, antioxidant activity was also analyzed. Results showed that lignin polymerization (referring to polymerization as lower phenolic content and higher molecular weight) occurred by the action of both laccases. The enzyme concentration was the most influential variable in the lignin polymerization reaction within the range studied for SiLA laccase, while the most influential variable for MtL laccase was the reaction time. FTIR and NMR characterization analysis corroborated lignin polymerization results obtained from the RSM.

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