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      Self-generated peroxyacetic acid in phosphoric acid plus hydrogen peroxide pretreatment mediated lignocellulose deconstruction and delignification

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          Abstract

          Background

          Peroxyacetic acid involved chemical pretreatment is effective in lignocellulose deconstruction and oxidation. However, these peroxyacetic acid are usually artificially added. Our previous work has shown that the newly developed PHP pretreatment (phosphoric acid plus hydrogen peroxide) is promising in lignocellulose biomass fractionation through an aggressive oxidation process, while the information about the synergistic effect between H 3PO 4 and H 2O 2 is quite lack, especially whether some strong oxidant intermediates is existed. In this work, we reported the PHP pretreatment system could self-generate peroxyacetic acid oxidant, which mediated the overall lignocellulose deconstruction, and hemicellulose/lignin degradation.

          Results

          The PHP pretreatment profile on wheat straw and corn stalk were investigated. The pathways/mechanisms of peroxyacetic acid mediated-PHP pretreatment were elucidated through tracing the structural changes of each component. Results showed that hemicellulose was almost completely solubilized and removed, corresponding to about 87.0% cellulose recovery with high digestibility. Rather high degrees of delignification of 83.5% and 90.0% were achieved for wheat straw and corn stalk, respectively, with the aid of peroxyacetic acid oxidation. A clearly positive correlation was found between the concentration of peroxyacetic acid and the extent of lignocellulose deconstruction. Peroxyacetic acid was mainly self-generated through H 2O 2 oxidation of acetic acid that was produced from hemicellulose deacetylation and lignin degradation. The self-generated peroxyacetic acid then further contributed to lignocellulose deconstruction and delignification.

          Conclusions

          The synergistic effect of H 3PO 4 and H 2O 2 in the PHP solvent system could efficiently deconstruct wheat straw and corn stalk lignocellulose through an oxidation-mediated process. The main function of H 3PO 4 was to deconstruct biomass recalcitrance and degrade hemicellulose through acid hydrolysis, while the function of H 2O 2 was to facilitate the formation of peroxyacetic acid. Peroxyacetic acid with stronger oxidation ability was generated through the reaction between H 2O 2 and acetic acid, which was released from xylan and lignin oxidation/degradation. This work elucidated the generation and function of peroxyacetic acid in the PHP pretreatment system, and also provide useful information to tailor peroxide-involved pretreatment routes, especially at acidic conditions.

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          Supplementary Information

          The online version contains supplementary material available at 10.1186/s13068-021-02075-w.

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          Most cited references53

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          Importance of chemical pretreatment for bioconversion of lignocellulosic biomass

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            Coupling the post-extraction process to remove residual lignin and alter the recalcitrant structures for improving the enzymatic digestibility of acid-pretreated bamboo residues

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              From lignocellulosic biomass to levulinic acid: A review on acid-catalyzed hydrolysis

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                Author and article information

                Contributors
                fishen@sicau.edu.cn
                zhaoli@sicau.edu.cn
                Journal
                Biotechnol Biofuels
                Biotechnol Biofuels
                Biotechnology for Biofuels
                BioMed Central (London )
                1754-6834
                25 November 2021
                25 November 2021
                2021
                : 14
                : 224
                Affiliations
                [1 ]GRID grid.80510.3c, ISNI 0000 0001 0185 3134, Institute of Ecological and Environmental Sciences, , Sichuan Agricultural University, ; Chengdu, 611130 Sichuan People’s Republic of China
                [2 ]GRID grid.22072.35, ISNI 0000 0004 1936 7697, Department of Chemical and Petroleum Engineering, , University of Calgary, ; 2500 University Dr. NW, Calgary, AB T2N 1N4 Canada
                [3 ]GRID grid.80510.3c, ISNI 0000 0001 0185 3134, College of Environmental Sciences, , Sichuan Agricultural University, ; Chengdu, 611130 Sichuan People’s Republic of China
                Author information
                http://orcid.org/0000-0001-5693-170X
                Article
                2075
                10.1186/s13068-021-02075-w
                8614055
                34823568
                2609350f-6cc0-4f12-877f-a5d1927d56d7
                © The Author(s) 2021

                Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

                History
                : 2 September 2021
                : 13 November 2021
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100001809, National Natural Science Foundation of China;
                Award ID: 21978183
                Award Recipient :
                Categories
                Research
                Custom metadata
                © The Author(s) 2021

                Biotechnology
                lignocellulose pretreatment,peroxyacetic acid,deconstruction mechanism
                Biotechnology
                lignocellulose pretreatment, peroxyacetic acid, deconstruction mechanism

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