AI Article Synopsis

  • Tobacco stalks, rich in biomacromolecules but highly lignified, are challenging to decompose into cellulose fibers, leading to their underutilization in industry.
  • A mild three-stage alkali-oxygen process was developed, effectively breaking down tobacco stalk cell walls and producing high-brightness cellulose fibers.
  • The study also isolated valuable organic compounds from the process, showing potential for producing chemicals and biofuels, while preserving lignin structures that could be used for further applications.

Article Abstract

Tobacco stalks, as one of the annual economic crops rich in biomacromolecules such as cellulose and hemicellulose, are more difficult to decompose into cellulose fibers due to their high degree of lignification compared to other ordinary straw feedstocks, resulting in their underutilization. In this study, we developed a mild three-stage alkali‑oxygen (AO) process to efficiently deconstruct the tobacco stalk cell walls. The process, involving alkaline dosages of 15 %, 10 %, and 3 % at each stage, effectively dissociated the cell walls and yielded cellulose fibers with high brightness (42.0 % ISO). The organics in the spent liquor, including lignin, hemicellulose, and small-molecular extracts, were isolated through acid/ethanol precipitation and organic solvent extraction. Lignin characterization by 2D HSQC NMR indicated that the majority of native β-aryl ether linkages were preserved after AO treatment, making it suitable for producing chemicals or biofuels via depolymerization. Additionally, the small-molecular extracts contained numerous depolymerized products from lignin and carbohydrates, as well as bioactive compounds derived from the tobacco stalk. Overall, this mild, efficient, and eco-friendly process offers a promising approach for the valorization of tobacco stalks and similar biomass resources.

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http://dx.doi.org/10.1016/j.ijbiomac.2024.135512DOI Listing

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