Abstract
Pretreatments with different concentrations of sulfuric acid (0, 0.5, and 1% v/v) and temperatures (28 and 121 °C at 103 kPa in an autoclave) were performed on banana peels (BP) milled by mechanical grinding and grinding in a blender as well as without grinding. Cellulose, hemicellulose, lignin, ash, and total and reducing sugar contents were evaluated. The highest yields of cellulose enzymatic hydrolysis (99%) were achieved with liquefied autoclaved BP treated with 0.5 and 1% acid after 48 h of hydrolysis. Ethanol production by Kluyveromyces marxianus fermentation was assayed using hydrolyzed BP at 10, 15, and 20% (w/w). The highest ethanol level (21 g/L) was reached after 24 h of fermentation with 20% (w/w) BP. Kinetics of the consumption of reducing sugars under this fermentation condition demonstrates the presence of a lag period (about 8 h). Thus, BP are a good source for ethanol production.
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Acknowledgements
Authors would thank to the Mexican National Council of Science and Technology (CONACYT) for the financial support of the project PDCPN 2013-01-213844, Ph.D. scholarship, and for the financial support under the program “Cátedras-CONACyT” (Researcher No. 2498).
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Palacios, S., Ruiz, H.A., Ramos-Gonzalez, R. et al. Comparison of physicochemical pretreatments of banana peels for bioethanol production. Food Sci Biotechnol 26, 993–1001 (2017). https://doi.org/10.1007/s10068-017-0128-9
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DOI: https://doi.org/10.1007/s10068-017-0128-9