Improving the semi-continuous flow-through subcritical water hydrolysis of grape pomace (Vitis vinifera L.) by pH and temperature control

This study investigated how pH (6−10) and temperature (150–210 °C) could be explored to improve yields and reduce the formation of inhibitory compounds during the semi-continuous flow-through subcritical water hydrolysis of grape pomace (Vitis vinifera L.). The results showed that the highest sugar...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2023-05, Vol.196, p.105894, Article 105894
Main Authors: Castro, Luiz Eduardo Nochi, Sganzerla, William Gustavo, Barroso, Tiago Linhares Cruz Tabosa, Maciel-Silva, Francisco Weshley, Colpini, Leda Maria Saragiotto, Bittencourt, Paulo Rodrigo Stival, Rostagno, Mauricio A., Forster-Carneiro, Tânia
Format: Article
Language:English
Subjects:
Grape pomace
Hydrolysis
Inhibitors
Organic acids
Subcritical water
Sugars
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Summary:This study investigated how pH (6−10) and temperature (150–210 °C) could be explored to improve yields and reduce the formation of inhibitory compounds during the semi-continuous flow-through subcritical water hydrolysis of grape pomace (Vitis vinifera L.). The results showed that the highest sugar (cellobiose, glucose, fructose, arabinose) concentration (34.64 g 100 g-1) was obtained at pH 6 and 150 °C. The use of higher temperatures (210 °C) at pH 10 allowed to produce low inhibitory compounds (furfural and 5-hydroxymethylfurfural, 1.59 g 100 g-1) and high organic acid content (290.76 g 100 g-1). Thermogravimetric analysis indicated that the biomass structure was modified by subcritical hydrolysis, with a hemicellulose reduction of approximately 75%. In conclusion, subcritical water hydrolysis at pH 10 and 210 ºC ate the optimal conditions to recover sugars and organic acids from grape pomace. [Display omitted] •Subcritical water hydrolysis was used to obtain sugars and organic acids from grape pomace.•The highest sugar concentration (34.64 g 100 g−1) was obtained at pH 6 and 150 °C.•The highest organic acid concentration (290.76 ± 30.96 g 100 g−1) was obtained at pH 10 and 210 °C.•The furfural and 5-hydroxymethylfurfural were obtained only at 210 °C.•At 210 °C the hemicellulose content reduced at 60%, resulting in the production of arabinose (6.00 ± 1.47 g 100 g−1)
ISSN:0896-8446
1872-8162
DOI:10.1016/j.supflu.2023.105894