Granular starch hydrolysis of babassu agroindustrial residue: A bioprocess within the context of biorefinery

作者：Cinelli Bernardo A; Lopez Jimmy A; Castilho Leda R; Freire Denise M G^*; Castro Aline M

来源：Fuel, 2014, 124: 41-48.

DOI：10.1016/j.fuel.2014.01.076

• Enzyme production
• Solid-state fermentation
• Cold hydrolysis
• Simultaneous saccharification and fermentation (SSF)
• Ethanol

The conversion of renewable feedstocks into a range of commercial products and energy is the principle underlying the concept of biorefinery. In this work, two agroindustrial by-products from babassu were used as unconventional biomasses to develop a sustainable process. Babassu cake was used to produce a multienzyme complex, which was able to hydrolyse starch granules and to release free amino nitrogen from babassu flour, yielding a hydrolysate rich in carbon and nitrogen nutrients. To exemplify its possible applications, different strategies for ethanol production by simultaneous saccharification and fermentation (SSF) were investigated and that comprising a 4-h hydrolysis step at 50 degrees C followed by 44 h of SSF at 32 degrees C showed the most promising results (53.6 g/L ethanol, 83% efficiency of starch into ethanol and productivity of 1.12 g/(L h)). On-site enzymes promoted better results than a commercial enzyme product (110.9 +/- 6.6 g/L versus 74.5 +/- 1.8 g/L glucose releases, respectively), and showed high efficiency and productivity also on corn flour, either similar or superior to those reported for the industrial-scale dry-grind process.

• 出版日期2014-5-15