Ethanol production by Escherichia coli from detoxified lignocellulosic teak wood hydrolysates with high concentration of phenolic compounds
| Autor: | Eduardo Vivaldo-Lima, Jorge Alcaraz-Cienfuegos, Alejandra Vargas-Tah, Estefanía Sierra-Ibarra, Martín Hernández-Luna, Alfredo Rosas Martínez, Alberto Rosas-Aburto, Ángeles Valdivia-López |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Journal of Industrial Microbiology and Biotechnology. 49 |
| ISSN: | 1476-5535 1367-5435 |
| DOI: | 10.1093/jimb/kuab077 |
| Popis: | Teak wood residues were subjected to thermochemical pretreatment, enzymatic saccharification, and detoxification to obtain syrups with a high concentration of fermentable sugars for ethanol production with the ethanologenic Escherichia coli strain MS04. Teak is a hardwood, and thus a robust deconstructive pretreatment was applied followed by enzymatic saccharification. The resulting syrup contained 60 g l–1 glucose, 18 g l–1 xylose, 6 g l–1 acetate, less than 0.1 g l–1 of total furans, and 12 g l–1 of soluble phenolic compounds (SPCs). This concentration of SPC is toxic to E. coli, and thus two detoxification strategies were assayed: (1) treatment with Coriolopsis gallica laccase followed by addition of activated carbon and (2) overliming with Ca(OH)2. These reduced the phenolic compounds by 40% and 76%, respectively. The detoxified syrups were centrifuged and fermented with E. coli MS04. Cultivation with the overlimed hydrolysate showed a 60% higher volumetric productivity (0.45 gETOH l–1 hr–1). The bioethanol/sugar yield was over 90% in both strategies. |
| Databáze: | OpenAIRE |
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