title: A novel sono-assisted acid pretreatment of chili post harvest residue for bioethanol production.
abstract: The objective of the present study was to develop a sono-assisted acid pretreatment strategy for the effective removal of lignin and hemicelluloses and to improve the sugar yield from chili post harvest residue. Operational parameters that affect the pretreatment efficiency were studied and optimized. Inhibitor analysis of the hydrolyzate revealed that major fermentation inhibitors like furfural, hydroxymethyl furfural and organic acids like citric acid, succinic acid and propionic acid were absent. Changes in structural properties of the biomass were studied in relation to the pretreatment process using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) analysis, and the changes in chemical composition was also monitored. The biomass pretreated with the optimized novel method yielded 0.465g/g of reducing sugars on enzymatic hydrolysis. Fermentation of the non-detoxified hydrolysate yielded 2.14% of bioethanol with a fermentation efficiency of 71.03%.
authors.affiliation: Biotechnology Division, National Institute for Interdisciplinary Science and Technology, CSIR, Trivandrum 695 019, India. Electronic address: sindhurgcb@gmail.com.
authors.forename: Raveendran
authors.initials: R
authors.lastname: Sindhu
authors.affiliation: Biotechnology Division, National Institute for Interdisciplinary Science and Technology, CSIR, Trivandrum 695 019, India.
authors.forename: Parameswaran
authors.initials: P
authors.lastname: Binod
authors.affiliation: Biotechnology Division, National Institute for Interdisciplinary Science and Technology, CSIR, Trivandrum 695 019, India.
authors.forename: Ashok
authors.initials: A
authors.lastname: Pandey
mesh_terms: D000143:Acids / Q000737:chemistry; D056804:Biofuels; D018533:Biomass; D002212:Capsicum / Q000737:chemistry*; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D006868:Hydrolysis; D008031:Lignin / Q000302:isolation & purification; D008855:Microscopy, Electron, Scanning; D011134:Polysaccharides / Q000302:isolation & purification; D013010:Sonication; D014961:X-Ray Diffraction
chemical_list: D000143:Acids; D056804:Biofuels; D011134:Polysaccharides; D000431:Ethanol; C007916:hemicellulose; D008031:Lignin
keywords: Bioethanol; Chili; Pretreatment; Saccharification; Sonication