Aqueous pretreatment of agricultural wastes: characterization of soluble reaction products.
This work provides an assessment on the hydrothermal processing (or autohydrolysis treatments) of two lignocellulosic wastes: mixed herbs (denoted MH, mainly belonging to the Lolium species), and sunflower seed shells (denoted SS). Compositional data were obtained for both raw materials (which contained cellulose, heteroxylan and Klason lignin as major components). In autohydrolysis experiments, the raw materials presented a "susceptible fraction" which was solubilized according to a first-order kinetics. Hemicellulose degradation was followed by determination of xylooligomers, xylose and xylan substituents (arabinosyl, uronic acid and acetyl substituents). Kinetic modelling of hemicellulose degradation was carried out considering four consecutive, first-order, pseudohomogeneous reactions. The molecular weight distribution of polymeric and oligomeric fractions derived from xylan was assessed from High Performance Size Exclusion Chromatography data.
Gullón
Patricia
P
Department of Chemical Engineering, University of Vigo, Campus Ourense, As Lagoas, 32004 Ourense, Spain.
Pereiro
Gabriel
G
Alonso
José Luis
JL
Parajó
Juan Carlos
JC
D000383:Agriculture / Q000379:methods*; D001709:Biotechnology / Q000379:methods*; D006368:Helianthus; D006868:Hydrolysis; D007220:Industrial Waste; D007700:Kinetics; D008031:Lignin / Q000737:chemistry*; D009844:Oligosaccharides / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D012639:Seeds / Q000737:chemistry; D014574:Uronic Acids / Q000737:chemistry; D014867:Water / Q000737:chemistry*; D014990:Xylans / Q000737:chemistry; D014994:Xylose / Q000737:chemistry
D007220:Industrial Waste; D009844:Oligosaccharides; D011134:Polysaccharides; D014574:Uronic Acids; D014990:Xylans; D014867:Water; C007916:hemicellulose; D008031:Lignin; D014994:Xylose