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Using recyclable pH-responsive lignin amphoteric surfactant to enhance the enzymatic hydrolysis of lignocelluloses

Abstract

In order to enhance the enzymatic hydrolysis of lignocelluloses and recycle surfactants after enzymatic hydrolysis, pH-responsive lignin amphoteric surfactant (SLQA) was prepared by the quaternization of sulfonated lignin (SL). Compared with SL, SLQA could much more effectively enhance the enzymatic hydrolysis of lignocelluloses. With the increase of quaternization degree, the enhancement of SLQA on the enzymatic hydrolysis of lignocelluloses gradually increased. Adding 2g/L SLQA-80 (mass radio of quaternizing agent to SL was 80%) could increase the enzymatic digestibility of pretreated eucalyptus and corncob residues (CCR) from 36.7% and 37.8% to 84.3% and 90.5%, respectively. The adsorption of SLQA on lignin film was larger than that of SL, and the lignin film became more hydrophilic after adsorbing SLQA. So SLQA could form more effective steric hindrance and hydration layer to reduce the non-productive adsorption of cellulase on lignin. The purified SLQA-80 exhibited sensitive pH-responsive property, and 90.8% of SLQA-80 could be recycled by adjusting the pH of hydrolysate after enzymatic hydrolysis. Adding recyclable SLQA could not only obviously enhance the enzymatic hydrolysis of lignocelluloses, but also achieve the comprehensive utilization of lignocelluloses. This method is of great significance to reduce the cost of cellulosic ethanol.

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Publication details

The article was received on 22 Aug 2017, accepted on 10 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7GC02571H
Citation: Green Chem., 2017, Accepted Manuscript
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    Using recyclable pH-responsive lignin amphoteric surfactant to enhance the enzymatic hydrolysis of lignocelluloses

    C. Cai, X. Zhan, M. Zeng, H. Lou, Y. Pang, J. Yang, D. Yang and X. Qiu, Green Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7GC02571H

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