title: Hydrolysis of sweet blue lupin hull using subcritical water technology.
abstract: Hydrolysis of sweet blue lupin hulls was conducted in this study using subcritical water technology. Effects of process parameters, such as pressure (50-200 bar), temperature (160-220°C), flow rate (2-10 mL/min), and pH (2-12), were studied to optimize maximum hemicellulose sugars recovery in the extracts. Extracts were analyzed for total hemicellulose sugars, phenolics and organic carbon contents and solid residues left after treatments were also characterized. Temperature, flow rate, and pH had a significant effect on hemicellulose sugar removal; however, the effect of pressure was not significant. The highest yield of hemicellulose sugars in the extracts (85.5%) was found at 180°C, 50 bar, 5 mL/min and pH 6.2. The thermal stability of the solid residue obtained at optimum conditions improved after treatment and the crystallinity index increased from 11.5% to 58.6%. The results suggest that subcritical water treatment is a promising technology for hemicellulose sugars removal from biomass.
authors.affiliation: Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada.
authors.forename: Deniz
authors.initials: D
authors.lastname: Ciftci
authors.affiliation: Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada. Electronic address: marleny.saldana@ualberta.ca.
authors.forename: Marleny D A
authors.initials: MD
authors.lastname: Saldaña
mesh_terms: D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry; D031297:Lupinus / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D011134:Polysaccharides / Q000737:chemistry*; D011312:Pressure; D013696:Temperature; D013818:Thermogravimetry; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D011134:Polysaccharides; D014867:Water; C036909:lignocellulose; C007916:hemicellulose; D008031:Lignin
keywords: Hemicellulose; Lignocellulosic biomass; Lupin hull; Subcritical water technology