Journal
BIORESOURCE TECHNOLOGY
Volume 343, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126147
Keywords
Ascorbic acid; Decomposed lignin; Enhanced delignification; Enzymatic hydrolysis; NMR analysis
Funding
- National Natural Science Foundation of China [32171730]
- Natural Science Foundation of Jiangsu Province, China [BK20210623]
- National Key R&D Program of China [2017YFD0601001]
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The addition of ascorbic acid enhances lignin decomposition and cellulose conversion in dilute acid pretreatment, with a dose-dependent effect. NMR analysis shows that ascorbic acid significantly stimulates decomposed lignins compared to residual bulk lignins, leading to increased cellulose conversion. Therefore, ascorbic acid can improve the cellulose conversion rate of pretreated materials.
The effect of ascorbic acid addition on lignin decomposition in the dilute acid pretreatment and the corresponding cellulose conversion of pretreated biomass have been studied. This enhancement by ascorbic acid addition was dose dependent. Decomposed and residual bulk lignins from pretreated poplar were analyzed by 2D HSQC and P-31 NMR spectra. The promotional effect on lignocellulose decomposition with the assistance of ascorbic acid addition was supported by the NMR analysis. The analysis showed that the addition of ascorbic acid has a more significant stimulation on decomposed lignins compared to residual bulk lignins. The stimulatory effect of ascorbic acid in lignocellulose decomposition benefits the cellulose conversion of the corresponding pretreated materials. Poplar pretreatment assisted with ascorbic acid (2-8% w/w) increased the final hydrolysis yield by 7.5%-32.2%. This promotional effect of ascorbic acid on enzyme digestibility was more obvious with higher enzyme loading.
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