Subcritical water pretreatment for agave bagasse fractionation from tequila production and enzymatic susceptibility

• Published in: Bioresource technology 2021-10, Vol.338, p.125536-125536, Article 125536
• Main Authors: Singh, Anusuiya, Rodríguez-Jasso, Rosa M., Saxena, Rohit, Cerda, Ruth Belmares, Singhania, Reeta Rani, Ruiz, Héctor A.
• Format: Article
• Language: English
• Subjects: Autohydrolysis; Biomass; Biorefinery; Cellulose; Hydrothermal processing
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2021.125536

•Agave Bagasse was obtained from different tequila production processes.•Subcritical water is a promising process for agave bagasse fractionation.•Pretreated agave bagasse was subjected to enzymatic hydrolysis. This work focuses on the effect of subcritical water pretreatment conditions on agave bagasse chemical composition, biomass fractionation, and enzymatic hydrolysis obtained from the different tequila production processes. The pretreatment was carried out in a batch pressurized reactor within an isothermal regime. The operational conditions for subcritical water pretreatment were (150–190 °C) and (10–50 min). The best operational conditions were selected, based on the increased cellulose content (>50%) in the pretreated solid phase. The conditions for 190 °C for 50 and 30 min of pretreated agave bagasse solids were chosen for enzymatic hydrolysis susceptibility (15 FPU/g of the substrate). The maximum conversion yield (cellulose to glucose) during enzymatic hydrolysis achieved was up to 61.62% (5.86 g/L) in industrial bagasse at 72 h and initial saccharification rate was 0.34 g/(L*h) at 12 h. This study indicates that the agave bagasse is a promising raw material in the development of second-generation biorefineries.