Quantitative approaches for illustrating correlations among the mechanical fragmentation scales, crystallinity and enzymatic hydrolysis glucose yield of rice straw

• Published in: Bioresource technology 2017-10, Vol.241, p.262-268
• Main Authors: Ji, Guanya, Han, Lujia, Gao, Chongfeng, Xiao, Weihua, Zhang, Yang, Cao, Yaoyao
• Format: Article
• Language: English
• Subjects: Biomass; Bioreactors; Cell Wall; Crystalline properties; Glucose; Glucose yield; Hydrolysis; Mechanical fragmentation scales; Oryza; Quantitative approaches; Rice straw
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2017.05.062

[Display omitted] •Increase of glucose yield is limited with reduction of particle size at tissue scale.•Crystallinity significantly changed with particle size decreased to cellar scale.•Significant correlations among particle size, crystalline property and glucose yield.•Quantitative analysis for particle size, crystalline property and glucose yield. Mechanical fragmentation is an important pretreatment in the biomass biotransformation process. Mechanical fragmentation at the tissue scale significantly reduced the particle size of rice straw but did not significantly change its crystalline properties; the increase in the glucose yield was limited from 28.75% (95.55mg/g substrate) to 35.29% (115.28mg/g substrate). Mechanical fragmentation at the cellular scale destroyed the cell wall structure and reduced its crystalline properties. Thus, the glucose yield also showed a significant increase from 35.29% (115.28mg/g substrate) to 81.71% (287.07mg/g of substrate). The quantitative equations among the particle size, crystalline properties and glucose yield (mg/g substrate) are as follows: CrI=44.14×[1−exp(−0.03658×D50)] and CP=(8.403×logD50−24.1836)/(1−4.225/D50^0.5); GY=−5.636CrI+343.7 and GY=−14.62CP+512.1; and GY=97.218+247.5×exp(−0.03824×D50). The quantitative correlations among the mechanical fragmentation scales and crystalline properties can determine the effect and mechanism of mechanical fragmentation on biomass and can further promote the construction of a cost-competitive biotransformation process for biomass.