Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 180, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2022.114687
Keywords
Cellulose allomorphs; Enzymatic hydrolysis; Cellulase adsorption capacity; Interchain hydrogen bonds; C-6 hydroxymethyl conformation
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Funding
- International Science and Technology Innovation Cooperation Program of the State Key Research and Development Program [2021YFE0114400]
- National Natural Science Foundation of China [22168020, 21766014]
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This study investigated the effect of cellulose allomorphs on hydrolysis efficiency and found that cellulose II allomorph exhibited higher efficiency. These findings provide theoretical support for a better understanding of cellulose enzymatic hydrolysis.
Currently, the main problems in cellulose conversion to glucose are the low enzymatic hydrolysis efficiency and the high cellulase cost. In this study, cellulose I allomorph substrates were from p-toluenesulfonic acid (PT), dilute sulfuric acid (DA) and sulfite (SP) treated cellulose substrates, and cellulose II allomorph were prepared by mercerization. XRD, NMR, FTIR and molecular docking were used to investigate the effect of cellulose allomorphs on hydrolysis efficiency. The results showed that cellulose II allomorph had a lower cellulase adsorption capacity and higher hydrolysis efficiency. This was because cellulose II allomorph owned gt conformation, and less tg and gg conformations of C-6 hydroxymethyl, causing the reduction of interchain hydrogen bonds and the increase in hydrolysis efficiency (PT, DA and SP: from 62.04%, 65.62% and 63.21% to 83.23%, 89.24% and 87.65%, respectively). This study provided theoretical supports for further understanding the effect of cellulose allomorphs on enzymatic hydrolysis.
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