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Recovery of sugars and amino acids from brewers' spent grains using subcritical water hydrolysis in a single and two sequential semi-continuous flow-through reactors

Authors :
William Gustavo Sganzerla
Juliane Viganó
Luiz Eduardo Nochi Castro
Francisco Weshley Maciel-Silva
Mauricio A. Rostagno
Solange I. Mussatto
Tânia Forster-Carneiro
Source :
Gustavo Sganzerla, W, Viganó, J, Eduardo Nochi Castro, L, Weshley Maciel-Silva, F, Rostagno, M A, Mussatto, S I & Forster-Carneiro, T 2022, ' Recovery of sugars and amino acids from brewers' spent grains using subcritical water hydrolysis in a single and two sequential semi-continuous flow-through reactors ', Food Research International . https://doi.org/10.1016/j.foodres.2022.111470
Publication Year :
2022

Abstract

This study evaluated the subcritical water hydrolysis (SWH) of brewer's spent grains (BSG) to obtain sugars and amino acids. The experimental conditions investigated the hydrolysis of BSG in a single flow-through reactor and in two sequential reactors operated in semi-continuous mode. The hydrolysis experiments were carried out for 120 min at 15 MPa, 5 mL water min–1, at different temperatures (80 – 180 °C) and using an S/F of 20 and 10 g solvent g–1 BSG, for the single and two sequential reactors, respectively. The highest monosaccharide yields were obtained at 180 °C in a single reactor (47.76 mg g-1 carbohydrates). With these operational conditions, the hydrolysate presented xylose (0.477 mg mL-1) and arabinose (1.039 mg mL-1) as main sugars, while low contents of furfural (310.7 µg mL-1), 5-hydroxymethylfurfural (-1), and organic acids (0.343 mg mL-1) were obtained. The yield of proteins at 180 °C in a process with a single reactor was 43.62 mg amino acids g-1 proteins, where tryptophan (215.55 µg mL-1), aspartic acid (123.35 µg mL-1), valine (64.35 µg mL-1), lysine (16.55 µg mL-1), and glycine (16.1 µg mL-1) were the main amino acids recovered in the hydrolysate. In conclusion, SWH pretreatment is a promising technology to recover bio-based compounds from BSG; however, further studies are still needed to increase the yield of bioproducts from lignocellulosic biomass to explore two sequential reactors.

Details

ISSN :
18737145
Volume :
157
Database :
OpenAIRE
Journal :
Food research international (Ottawa, Ont.)
Accession number :
edsair.doi.dedup.....29789bb2e0e7d41897aefd30c61b4b45
Full Text :
https://doi.org/10.1016/j.foodres.2022.111470