Physicochemical Variation of the Main Components during Wild Pretreatment Process Based on the Concept of the Whole Utilization of Bamboo

Xiaojuan Yu,Kai Fan,Jianxin Jiang,Xiaopeng Peng,Meng Wang,Haiyan Yang,Kun Wang

doi:10.3390/en14216857

Abstract

Attempting to correlate the characteristics of the fractionated components from bamboo to its susceptibility to enzyme is often inconclusive depending on the parameters of pretreatment conditions. Based on the integrated analysis of chemical components, cellulose bioconversion, characteristic property of isolated hemicellulose, and lignin, the optimal mild pretreatment operation for Moso bamboo was 4% NaOH in 20% ethanol aqueous solution. A total of 91.9% mass was successfully recovered, and 66% bioconversion efficiency of the cellulosic sample was finally achieved. Meanwhile, over 25% hemicelluloses and 7% lignin were isolated, and the characteristic analysis indicated that the fractionated biomacromolecule maintained the original core structure, which is a benefit to be further utilized for the production of chemicals or polymers.

Highlights

Facing the worsening of the world energy crisis, herbaceous and woody lignocellulosic plants are increasingly needed for large-scale fabrication of bioenergy and bioproducts since they are a universally renewable and available feedstock [1]
This paper focuses on a pre-treatment method that allows for better whole utilization of cellulose, lignin, and hemicellulose in bamboo biomass
In order to obtain a series of chemical products from bamboo, mild pretreatment and the following fractionation process were used to explore the efficient isolation of lignocellulosic materials in this study

Summary

Introduction

Facing the worsening of the world energy crisis, herbaceous and woody lignocellulosic plants are increasingly needed for large-scale fabrication of bioenergy and bioproducts since they are a universally renewable and available feedstock [1]. Increasing attentions have been paid to the utilization of lignocellulose, composed of three main polymers (cellulose, lignin, and hemicellulose), which are firmly linked together to form a complicated structure, resulting in an essential barrier for biotransformation processes [2]. The most significant purpose of pretreatment is to increase the bioconversion efficiency of the cellulosic substrates, and to enhance the biotransformation efficiency and reduce the cost of utilization [3]. By breaking the lignin barrier, disrupting the cellulose crystal configuration and removing the non-cellulose components, the physicochemical and ultrastructural properties of lignocellulosic material could be destructed during the pretreatment process, improving the accessibility of cellulose [4]. As an important non-wood resource, the utilization scale of bamboo forest resources is increasing rapidly under the background of wood shortage and energy exhaustion [6]. The bamboo cell wall is a nanocomposite reinforced by microfibers and hemicellulose and lignin as the matrix

Methods

Results

Conclusion