Understanding triethylammonium hydrogen sulfate ([TEA][HSO4]) pretreatment induced changes in Pennisetum polystachion cell wall matrix and its implications on biofuel yield. (June 2023)

• Record Type: Journal Article
• Authors: Poolakkalody, Najya Jabeen; Ramesh, Kaviraj; Palliprath, Suchithra; Nittoor, Shima Namath; Santiago, Rogelio; Kabekkodu, Shama Prasada; Manisseri, Chithra
• Is Part Of: Renewable energy. Volume 209(2023)
• Page Start: 420
• Page End: 430
• Publication Date: 2023-06
• Subjects: Pennisetum polystachion -- Perennial grass -- Triethylammonium hydrogen sulfate -- Hydroxycinnamates -- Bioethanol -- Delignification; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2023.04.008
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: Biofuel potential of a widely grown perennial grass, Pennisetum polystachion, was analyzed using triethylammonium hydrogen sulfate ( [TEA][HSO 4 ] ) pretreatment. The optimum pretreatment condition was selected based on the delignification efficiency. 80% [TEA][HSO 4 ] at 140 °C for 45 min at 10% sample load, yielding high delignification rate (65.8%) was selected as the optimum pretreatment condition. Recycling of [TEA][HSO 4 ] showed up to 90% IL recovery and significant delignification rates. Glucan yield in the biomass increased to 67.8%, whereas digestibility of biomass enhanced from 16.7% to 84.1%. Extensive deferuloylation (88%) and decoumarylation (86.4%) were observed in the sample following pretreatment. Diferulic acids were not detected in pretreated samples indicating their complete removal. HMF (0.1 mg/mL) and furfural (0.001 mg/mL) produced during pretreatment were very low compared to conventional methods. FTIR and XRD confirmed pronounced delignification and hemicellulose dissolution, and FESEM showed a marked difference in the surface morphology, including defibrillation and enhanced porosity. An ethanol yield of 275 mg/g biomass (84.7% of theoretical maxima) was achieved using Saccharomyces cerevisiae MTCC 36 after 15 h of fermentation. The results obtained from the current study can shed light on utilizing P. polystachion as a potential biofuel feedstock using a low-cost ionic liquid [TEA][HSO 4 ] . Graphical abstract: Image 1