Biomass pretreatment with reactive extrusion using enzymes: A review

•Extrusion with enzymes (bioextrusion) is presented as a special case of reactive extrusion.•Different examples of bioextrusion of biomass (starch, lignocellulose) are presented.•Carbohydrate breakdown starts during bioextrusion.•Bioextrusion as pretreatment enhances the subsequent enzymatic catalys...

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Bibliographic Details
Published inIndustrial crops and products Vol. 122; pp. 329 - 339
Main Authors Gatt, Etienne, Rigal, Luc, Vandenbossche, Virginie
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.10.2018
Elsevier
Subjects
Agricultural sciences
Biomass
Enzymatic hydrolysis
Life Sciences
Lignocellulose
Reactive extrusion
Starch
DE
BAB
Starch
Reactive extrusion
Enzymatic hydrolysis
SME
Biomass
WSI
HTST
SC
BS
Lignocellulose
SEM
GPC
OPEFB
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Summary:•Extrusion with enzymes (bioextrusion) is presented as a special case of reactive extrusion.•Different examples of bioextrusion of biomass (starch, lignocellulose) are presented.•Carbohydrate breakdown starts during bioextrusion.•Bioextrusion as pretreatment enhances the subsequent enzymatic catalysis.•Bioextrusion allows lower solvent inputs into the process. Introducing enzymes during the extrusion process has been mainly used as new pretreatment techniques in the starch degradation process and, more recently, in the second generation bioethanol production. The technique, called the bioextrusion, is a special case of reactive extrusion. Starch and lignocellulose bioextrusion examples underline the good mixing capacities as a way to initiate the enzymatic reaction in high solid content conditions. Starch bioextrusion results show a low dextrinization yield but a real effect on the polymer size decrease which allows higher and faster subsequent saccharification. It also considerably reduced the recrystallization phenomenon that limits the saccharification efficiency. Bioextrusion of lignocellulose resulted in a better sugar production. Very short residence times limit the use of bioextrusion to a pretreatment technique. However, unique flexibility of the extrusion technique allows to subsequently pretreat, in the same extruder, with physical and/or chemical constraining conditions, followed by a milder bioextrusion.
ISSN:0926-6690
1872-633X
DOI:10.1016/j.indcrop.2018.05.069