Deep eutectic solvent pretreatment of cork dust - Effects on biomass composition, phenolic extraction and anaerobic degradability

BAĞDER ELMACI S., Schultz J., İŞCİ YAKAN A., Scherzinger M., Aslanhan D. D., Cam M. D., ...Daha Fazla

WASTE MANAGEMENT, cilt.181, ss.114-127, 2024 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 181
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1016/j.wasman.2024.04.007
  • Dergi Adı: WASTE MANAGEMENT
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Communication Abstracts, Compendex, Environment Index, Food Science & Technology Abstracts, Geobase, INSPEC, MEDLINE, Metadex, Pollution Abstracts, Veterinary Science Database, DIALNET, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.114-127
  • Anahtar Kelimeler: Anaerobic digestion, Biogas, Cork dust, Deep eutectic solvent pretreatment, Extraction, Phenolics
  • Ankara Üniversitesi Adresli: Evet

Özet

In this study, phenolic compounds using deep eutectic solvents (DES) were extracted from cork dust, and the biogas production potential of DES-treated cork dust samples was determined. The DES treatment was carried out using choline chloride and formic acid (1:2 M ratio) at various temperatures (90, 110 and 130 degrees C) and treatment times (20, 40 and 60 min) at a solid-to-solvent ratio of 1:10 g mL(-1). The highest total phenolic content (137 mg gallic acid equivalent (GAE) g(-1) dry cork dust) was achieved at 110 degrees C/20 min. The extracts exhibited an antioxidant capacity of up to 56.3 +/- 3.1 % 1,1-diphenyl-2-picrylhydazyl (DPPH) inhibition at a dilution rate of 100. DES treatment resulted in minimal sugar solubilization at low temperatures, while approximately 42 % of the xylan fraction in the biomass degraded under severe conditions (e.g., 130 degrees C/60 min). Catechin, 4-hydroxybenzoic acid and gallic acid were the major phenolics in DES extracts. The biogas yield of DES-treated cork dust increased with treatment severity. The highest biogas yield (115.1 mL(N) g(VS)(-1)) was observed at 130 degrees C/60 min, representing an increase of 125 % compared to the untreated sample. SEM images revealed that the surface structure of the samples became smoother after mild pretreatment and rougher after harsh pretreatment. Compositional and FTIR analyses indicated that a higher biogas formation potential was associated with increased cellulose content in the substrate, which could be attributed to hemicellulose solubilization in the hydrolysate. Overall, DES pretreatment effectively enhanced phenol extraction and anaerobic degradability.