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BIBTEX RIS

Removal of 5-hydroxymethylfurfural from brewer's spent grains hydrolysates obtained by subcritical water hydrolysis: An approach using liquid-liquid extraction

2023; Elsevier BV; Volume: 201; Linguagem: Inglês

10.1016/j.supflu.2023.106004

1872-8162

Tiago Linhares Cruz Tabosa Barroso, William Gustavo Sganzerla, Luiz Eduardo Nochi Castro, Nícolas Luís Moreira Freiria, Gerardo F. Barbero, Miguel Palma, Maurı́cio A. Rostagno, Tânia Forster‐Carneiro,

Biofuel production and bioconversion

This study evaluated the use of a semi-continuous subcritical water hydrolysis (SWH) process followed by liquid-liquid extraction to produce a concentrated hydrolysate with a low content of 5-hydroxymethylfurfural (5-HMF). The SWH was operated at 15 MPa, 180 °C, 5 mL min−1, and a solvent-to-feed ratio of 22.5 g g−1. The hydrolysate was subjected to liquid-liquid extraction at different pH (2.5–6.5), temperatures (25–45 °C), and volumetric ratios between hydrolysate and ethyl acetate (1:2–2:1 v/v) using the Box–Behnken design followed by response surface methodology. The optimal conditions for removing 5-HMF (73.85 %) were pH 6.5, 35 °C, and a volumetric ratio between hydrolysate and ethyl acetate of 1:2 (v/v). The hydrolysate presented a final composition of 14.82 g L−1 cellobiose, 10.83 g L−1 glucose, 6.36 g L−1 xylose, 3.61 g L−1 arabinose, 2.47 g L−1 formic acid, 3.75 g L−1 acetic acid, and 1.04 g L−1 5-HMF.