NDLI: Chemical Pretreatment of Sunflower Straw Biomass: The Effect on Chemical Composition and Structural Changes

Content Provider	Springer Nature Link
Author	Antonopoulou, Georgia Dimitrellos, George Beobide, Amaia Soto Vayenas, Dimitrios Lyberatos, Gerasimos
Copyright Year	2015
Abstract	In this study, various pretreatment methods, such as thermal (24 h at 80 °C; 1 h at 120 °C), alkaline (2–20 g ΝaΟΗ/100 g TS, 24 h at 80 °C) and acid (2–20 g Η$_{2}$SO$_{4}$/100 g TS, 1 h at 120 $^{ο}$C; 2–20 g Η$_{3}$PO$_{4}$/100 g TS, 1 h at 120 °C; 2–20 g HCl/100 g TS, 1 h at 120 °C), were applied on sunflower straw biomass and the effect of each pretreatment method on the fractionation of the lignocellulosic content was evaluated. Experiments showed that pretreatment with the acids led to higher hemicellulose solubilization, while lignin degradation was achieved when the sunflower was treated with NaOH. Higher acids concentration led to higher solubilization of hemicellulose and higher concentrations of released furaldehydes (5-hydroxymethylfurfural and furfural) and aliphatic acids (i.e. formic and acetic acid). On the contrary, the higher the NaOH concentration, the higher was the phenolics concentration observed. Scanning electron microscopy images revealed a change in morphology after different pretreatment methods, compared to the raw substrate. Thus, disruption of the outer layers and removal of mass from the initial connected structure were observed, for all pretreated feedstocks. Complete analysis of the liquid fractions obtained after pretreatment, led to the estimation of the ratio of sum of soluble sugars concentration to the sum of inhibitors concentration (Σ(soluble sugars)/Σ(inhibitors)), which characterizes the fermentability of the sunflower straw hydrolysates.
Starting Page	733
Ending Page	746
Page Count	14
File Format	PDF
ISSN	18772641
Journal	Waste and Biomass Valorization
Volume Number	6
Issue Number	5
e-ISSN	1877265X
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-06-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lignocellulosic biomass Pretreatment Sunflower straw SEM images IR spectroscopy Pretreatment severity Inhibitors Chemical composition Engineering Environment Renewable and Green Energy Industrial Pollution Prevention Waste Management/Waste Technology Environmental Engineering/Biotechnology
Content Type	Text
Resource Type	Article
Subject	Waste Management and Disposal Environmental Engineering Renewable Energy, Sustainability and the Environment

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