Use of high hydrostatic pressure (HHP) for increasing the product yield of lignocellulosic biomass hydrolysis: A study for peanut hull and microcrystalline cellulose

Ozturk E., Oztop M. H., ALPAS H.

LWT-FOOD SCIENCE AND TECHNOLOGY, vol.147, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 147
  • Publication Date: 2021
  • Doi Number: 10.1016/j.lwt.2021.111556
  • Journal Name: LWT-FOOD SCIENCE AND TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Food Science & Technology Abstracts, Veterinary Science Database
  • Keywords: Lignocellulosic biomass, Enzymatic activity, High hydrostatic pressure (HHP), Nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR) spectrometry, ENZYMATIC-HYDROLYSIS, PRETREATMENT, CHEMICALS, PLATFORM, GLUCOSE, SURFACE, IMPACT, STRAW
  • Yıldız Technical University Affiliated: Yes

Abstract

Cellulase activity is a critical parameter for generating alternative renewable fuels. For observing this activity, Avicel (microcrystalline cellulose) is a widely used substrate. As lignocellulosic biomass in nature, peanut hull (35% cellulose) is a suitable material to convert the chemical feedstocks. Alkaline pretreatment (with NaOH solution at 121 degrees C for 1 h) is a necessary process to increase the yield of the hydrolysis due to the high lignin content of the biomass. The objective of this study is to determine the effects of high hydrostatic pressure (HHP) on cellulase-hemicellulase (Celluclast) activity and the subsequent hydrolysis. Enzyme mixtures were subjected to 100 and 500 MPa for 5-15 min, at 30 degrees C both with and without substrate. HHP-treated enzyme and enzymesubstrate solutions had significantly (p 0.05) higher reducing sugar content (up to 2.06 and 2.83 g/L increases for Avicel, 0.85 and 0.96 g/L for peanut hulls; respectively) than non-HHP-treated solutions. Nevertheless, no significant difference was observed between 100 and 500 MPa (p 0.05). NMR T2 relaxation times of the treated and hydrolyzed samples were affected by HHP. Additionally, enzymatic hydrolysis significantly increased the T2 (p < 0.05). The changes on peanut hulls after HHP, alkaline pretreatment, and enzymatic hydrolysis were observed by using FTIR spectrometry.