Ethanol Production from Corncob Assisted by Polyethylene Glycol and Conversion of Lignin-Rich Residue into Lignosulfonate and Phenolic Acids.

Autor: Maduzzi, Julieta, Thomas, Habila Yusuf, Fidelis, José Dário Silva, de Carvalho, José Valderisso Alfredo, Silva, Elano Costa, da Costa Filho, José Daladiê Barreto, Cavalcante, José Demétrio Nery, dos Santos, Everaldo Silvino, de Santana Souza, Domingos Fabiano, de Araújo Padilha, Carlos Eduardo
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Zdroj: BioEnergy Research; Sep2024, Vol. 17 Issue 3, p1598-1611, 14p
Abstrakt: The economic competitiveness of 2G-bioethanol technology should improve through the improvement of the sugar release and the valorization of by-products, especially lignin. Thus, an integrated scheme with corncob was developed to produce ethanol using low dosages of cellulases and value-added products from the semi-simultaneous saccharification and fermentation (SSSF) residue. Enzymatic hydrolysis and SSSF of acid pretreated corncob (< 20 mesh and > 20 mesh) were carried out under cellulase dosages of 5, 10, and 15 FPU/g in the absence and presence of polyethylene glycol 1500 (PEG 1500). The SSSF residue was used to obtain lignosulfonate via sulfomethylation reaction and phenolic acids via alkaline hydrolysis using 4% (w/v) sodium hydroxide and 0–5% (v/v) hydrogen peroxide. Pretreated corncob < 20 mesh allowed the reduction of cellulase dosage to 5 FPU/g without compromising sugar release. The addition of PEG 1500 boosted sugar release, reaching 56.73 g/L glucose under 20% (w/v) solids. The maximum ethanol production of 31.64 g/L was obtained using 5 FPU/g cellulases, 2% (w/w) PEG 1500, and 20% (w/v) solids (gradual addition). FTIR confirmed the preparation of lignosulfonate from SSSF residue, and the surfactant showed good stabilization performance in oil/water systems (emulsification index≈30%). High yields of p-coumaric acid (8045.3 mg/100 g) and ferulic acid (1429.4 mg/100 g) were obtained in alkaline hydrolysis with 5% (v/v) hydrogen peroxide. Based on these findings, corncob is versatile and can create a biorefinery with high economic potential. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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