Issue 13, 2021

Optimizing two green-like biomass pretreatments for maximum bioethanol production using banana pseudostem by effectively enhancing cellulose depolymerization and accessibility

Abstract

The banana is an important fruit crop that generates enormous quantities of lignocellulose-rich pseudostem residues that can be converted into biofuels and biochemicals. By performing response surface methodological modeling, optimized green liquor (GL) and liquid hot water (LHW) pretreatments of representative banana samples were studied. Using banana (BP-1) pseudostem residues rich in directly fermentable soluble sugars (27% hexoses and 2.7% pentoses via dry matter) and easily digestible xyloglucans, we measured nearly complete enzymatic saccharification with a hexose yield of 99% (% cellulose) from the most optimal GL pretreatment under relatively mild conditions. Notably, both optimal LHW (20 min, 110 °C) and GL (26.74% TTA, 105 °C, 26 min) pretreatments led to the highest bioethanol yields achieved thus far, at 27% and 31% (% dry matter), respectively, subjective to yeast fermentation with all hexose sources obtained in the BP-1 sample. Furthermore, we determined that optimal LHW and GL pretreatments extracted lignin by 25% and 40%, and reduced the cellulose crystalline index by 35% and 44% and polymerization degree by 34% and 36%, respectively, with distinctively altered lignin and hemicellulose features. Cellulose accessibility was increased 2–3 fold for remarkably enhanced enzymatic saccharification of biomass. Hence, we propose a mechanism model to elucidate why banana lignocellulose underwent complete biomass enzymatic saccharification under mild green-like pretreatments, providing an applicable strategy that can be used to produce large quantities of bioethanol from banana lignocellulose residues and beyond.

Graphical abstract: Optimizing two green-like biomass pretreatments for maximum bioethanol production using banana pseudostem by effectively enhancing cellulose depolymerization and accessibility

Supplementary files

Article information

Article type
Paper
Submitted
21 Apr 2021
Accepted
31 May 2021
First published
31 May 2021

Sustainable Energy Fuels, 2021,5, 3467-3478

Optimizing two green-like biomass pretreatments for maximum bioethanol production using banana pseudostem by effectively enhancing cellulose depolymerization and accessibility

F. Liu, J. Li, H. Yu, Y. Li, Y. Wang, H. Gao, H. Peng, Z. Hu, H. Wang, G. Zhang, Y. Tu and L. Peng, Sustainable Energy Fuels, 2021, 5, 3467 DOI: 10.1039/D1SE00613D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements