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Ethylenediamine pretreatment changes cellulose allomorph and lignin structure of lignocellulose at ambient pressure.

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  • معلومة اضافية
    • المصدر:
      Publisher: BioMed Central Country of Publication: England NLM ID: 101316935 Publication Model: eCollection Cited Medium: Print ISSN: 1754-6834 (Print) Linking ISSN: 17546834 NLM ISO Abbreviation: Biotechnol Biofuels Subsets: PubMed not MEDLINE
    • بيانات النشر:
      Original Publication: [London] : BioMed Central
    • نبذة مختصرة :
      Background: Pretreatment of lignocellulosic biomass is essential to increase the cellulase accessibility for bioconversion of lignocelluloses by breaking down the biomass recalcitrance. In this work, a novel pretreatment method using ethylenediamine (EDA) was presented as a simple process to achieve high enzymatic digestibility of corn stover (CS) by heating the biomass-EDA mixture with high solid-to-liquid ratio at ambient pressure. The effect of EDA pretreatment on lignocellulose was further studied.
      Results: High enzymatic digestibility of CS was achieved at broad pretreatment temperature range (40-180 °C) during EDA pretreatment. Herein, X-ray diffractogram analysis indicated that cellulose I changed to cellulose III and amorphous cellulose after EDA pretreatment, and cellulose III content increased along with the decrease of drying temperature and the increase of EDA loading. Lignin degradation was also affected by drying temperature and EDA loading. Images from scanning electron microscope and transmission electron microscope indicated that lignin coalesced and deposited on the biomass surface during EDA pretreatment, which led to the delamination of cell wall. HSQC NMR analysis showed that ester bonds of p-coumarate and ferulate units in lignin were partially ammonolyzed and ether bonds linking the phenolic monomers were broken during pretreatment. In addition, EDA-pretreated CS exhibited good fermentability for simultaneous saccharification and co-fermentation process.
      Conclusions: EDA pretreatment improves the enzymatic digestibility of lignocellulosic biomass significantly, and the improvement was caused by the transformation of cellulose allomorph, lignin degradation and relocalization in EDA pretreatment.
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    • Contributed Indexing:
      Keywords: Biomass; Cellulose; Ethylenediamine; Hydrolysis; Lignin; Pretreatment
    • الموضوع:
      Date Created: 20151031 Date Completed: 20151030 Latest Revision: 20220317
    • الموضوع:
      20231215
    • الرقم المعرف:
      PMC4625619
    • الرقم المعرف:
      10.1186/s13068-015-0359-z
    • الرقم المعرف:
      26516347