Effects of grinding processes on enzymatic degradation of wheat straw |
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Authors: | Silva Gabriela Ghizzi D Couturier Marie Berrin Jean-Guy Buléon Alain Rouau Xavier |
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Affiliation: | a INRA, UMR 1208 IATE “Agropolymers Engineering and Emerging Technologies”, INRA/CIRAD/UM2/SupAgro, 2 place Pierre Viala, F-34060 Montpellier, France b INRA, UMR 1163 “Biotechnologie des Champignons Filamenteux”, INRA/Universités de Provence et de la Méditerranée, IFR86-BAIM, ESIL, 163 avenue de Luminy CP 925, F-13288 Marseille, France c INRA, UR BIA “Biopolymers, Interactions, Assemblies Unit”, INRA, Rue de la Géraudière, BP 71627, F-44316 Nantes Cedex 03, France |
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Abstract: | The effectiveness of wheat straw fine to ultra-fine grindings at pilot scale was studied. The produced powders were characterised by their particle-size distribution (laser diffraction), crystallinity (WAXS) and enzymatic degradability (Trichoderma reesei enzymatic cocktail). A large range of wheat-straw powders was produced: from coarse (median particle size ∼800 μm) to fine particles (∼50 μm) using sieve-based grindings, then ultra-fine particles ∼20 μm by jet milling and ∼10 μm by ball milling. The wheat straw degradability was enhanced by the decrease of particle size until a limit: ∼100 μm, up to 36% total carbohydrate and 40% glucose hydrolysis yields. Ball milling samples overcame this limit up to 46% total carbohydrate and 72% glucose yields as a consequence of cellulose crystallinity reduction (from 22% to 13%). Ball milling appeared to be an effective pretreatment with similar glucose yield and superior carbohydrate yield compared to steam explosion pretreatment. |
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Keywords: | %Crys, relative crystallinity CM2mm, wheat straw processed by 2 mm-cutting milling SC1mm, SC0.5mm, SC0.25mm and SC0.12mm, 1, 0.5, 0.25 and 0.12mm-successive centrifugal grinding CG0.5mm, single step of 0.5 mm-centrifugal grinding IG0.2mm and IG0.3mm, 0.2 and 0.3 mm-impact grinding BMi48h, BMi120h, BMi240h, series i of ball milling for 48 120 or 240 h BMii24h, BMii48h, BMii72h, BMii96h, BMii120h, BMii144h, BMii168h, BMii192h, BMii216h and BMii240h, series ii of ball milling from 24 to 240 h JM, jet milling SE-WS, steam-exploded wheat straw |
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