INRA, UMR 1208 IATE Agropolymers Engineering and Emerging Technologies, INRA/CIRAD/UM2/SupAgro, 2 place Pierre Viala, F-34060 Montpellier, France.
Bioresour Technol. 2012 Jan;103(1):192-200. doi: 10.1016/j.biortech.2011.09.073. Epub 2011 Sep 22.
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.
研究了麦秸细磨至超细磨在中试规模下的效果。通过激光衍射法对所制得的粉末的粒径分布进行了表征，通过 X 射线衍射（WAXS）对其结晶度进行了表征，通过里氏木霉酶制剂对其酶降解性进行了表征。利用基于筛网的研磨方法，可制得一系列不同粒径的麦秸粉末：从粗颗粒（中值粒径约 800μm）到细颗粒（约 50μm），然后通过喷射研磨制得超细微颗粒（约 20μm），通过球磨制得亚微米颗粒（约 10μm）。随着粒径的减小，麦秸的降解能力逐渐增强，但存在一个极限：当粒径约为 100μm 时，总碳水化合物和葡萄糖水解产率最高分别可达 36%和 40%。球磨样品突破了这一极限，总碳水化合物和葡萄糖的产率分别可达 46%和 72%，这是由于纤维素结晶度降低（从 22%降至 13%）所致。与蒸汽爆破预处理相比，球磨预处理具有相似的葡萄糖产率和更高的碳水化合物产率，是一种有效的预处理方法。
