Mechano‐Hydrolysis of Non‐Conventional Substrates for Biofuel Culture Media

• Published in: Die Stärke Vol. 71; no. 5-6
• Main Authors: Juarez‐Arellano, Erick A., Morales‐Toledo, Lizzette I., Martinez‐Lopez, Valeria, Urzua‐Valenzuela, Michell, Aparicio‐Saguilan, Alejandro, Navarro‐Mtz, A. Karin
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.05.2019
• Subjects: Bioconversion; Biofuels; Biomass; biomass treatment; Cassava; Colocasia antiquorum; Colocasia esculenta; Culture media; Dextrose; E coli; Energy; Escherichia coli; Fermentation; Fuels; Growth media; high‐energy ball milling; Manihot esculenta; mechano‐hydrolysis; non‐conventional substrates; Physicochemical properties; Pretreatment; reducing sugar; Starch; Substrates; Sugar; Taro
• ISSN: 0038-9056; 1521-379X
• DOI: 10.1002/star.201800206

One of the most crucial steps in the bioconversion of biomass to biofuels is the biomass pretreatment. Here, the use of high‐energy ball‐milling as a one‐step treatment method for fast production of fermentable sugars from starch sources as tubercles (Colocasia esculenta (taro), Colocasia antiquorum (islander), and Manihot esculenta (cassava)) is explored. The results indicate that the maximum reducing sugar concentration is obtained after 20 min (taro and islander) or 30 min (cassava) of milling. Compared with untreated samples the reducing sugar concentration increases 1.5 times in cassava, 4.5 times in islander, and 4.8 times in taro. No fermentation inhibitors or by‐products are generated during the physical treatment. The milled samples have been used in the growth media of a model microorganism like Escherichia coliEscherichia coli. The E. coli growth yield using islander milled 20 min is 31 times higher than dextrose. Finally, a mechanism of the effect of high‐energy ball‐milling treatment on the physicochemical properties of starch‐rich biomass is proposed. From a structure–properties relationship perspective, this study provides insights into how high‐energy ball‐milling treatment regulates the physicochemical properties of starch‐rich biomass. The modification and damage of the amylopectin clusters seem to be the main mechanism in the production of reducing sugar from starch‐rich biomass. Thus, high‐energy ball milling can be used as a one‐step treatment in the production of reducing sugar from dry biomass.