Superfine pulverisation pretreatment to enhance crystallinity of cellulose from Lycium barbarum L. leaves

Carbohydr Polym. 2021 Feb 1:253:117207. doi: 10.1016/j.carbpol.2020.117207. Epub 2020 Oct 13.

Abstract

Superfine pulverisation (SFP) pretreatment of Lycium barbarum L. leaves was performed to obtain highly crystalline cellulose. Compared with other common pulverisation methods, SFP enhanced cellulosic crystallinity by 18.3 % and 8.4 %, with and without post-acid treatments, respectively. XRD and solid-state NMR analyses showed that SFP facilitated the exposure of amorphous substances (i.e., hemicellulose and lignin) to NaOH and H2O2. Large amounts of silicon (5.5 %) and aluminium (2.1 %) were found to incorporate into the crystalline regions of SFP-produced cellulose. Further FTIR and thermogravimetric analyses revealed that SFP-produced cellulose contained large amounts of hydroxyl groups, affecting the cellulosic crystallinity and thermal stability. These findings demonstrate the potential for SFP to serve as a green technology for production of highly crystalline and mineral-rich cellulose.

Keywords: Green chemistry; Highly crystalline cellulose; Minerals; Silicon nanoparticles; Solvent accessibility.

MeSH terms

  • Aluminum / chemistry
  • Cellulose / chemistry*
  • Crystallization
  • Hydrogen Peroxide / chemistry
  • Lignin / chemistry
  • Lycium / chemistry*
  • Particle Size
  • Plant Extracts / chemistry*
  • Plant Leaves / chemistry*
  • Polysaccharides / chemistry
  • Powders / chemistry
  • Silicon / chemistry
  • Sodium Hydroxide / chemistry
  • Sulfuric Acids / chemistry
  • Temperature

Substances

  • Plant Extracts
  • Polysaccharides
  • Powders
  • Sulfuric Acids
  • Sodium Hydroxide
  • hemicellulose
  • Cellulose
  • Lignin
  • Hydrogen Peroxide
  • Aluminum
  • sulfuric acid
  • Silicon