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

Author(s)

Nochi Castro, Luiz Eduardo ; Sganzerla, William Gustavo ; Cruz Tabosa Barrosoa, Tiago Linhares ; Maciel-Silva, Francisco Weshley ; Saragiotto Colpini, Leda Maria ; Stival Bittencourt, Paulo Rodrigo ; Rostagno, Mauricio A. ; Forster-Carneiro, Tania

• Document type: Journal article
• Source: JOURNAL OF SUPERCRITICAL FLUIDS; v. 196, p. 14-pg., 2023-02-28.

Abstract

This study investigated how pH (6-10) and temperature (150-210 degrees C) could be explored to improve yields and reduce the formation of inhibitory compounds during the semi-continuous flow-through subcritical water hy-drolysis 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 degrees C. The use of higher tem-peratures (210 degrees C) at pH 10 allowed to produce low inhibitory compounds (furfural and 5-hydroxymethylfurfu-ral, 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. (AU)

• FAPESP's process: 21/04096-9 - Integration of the extraction/hydrolysis processes in subcritical water and purification for the valuation of grape bagasse in a biorrefinery concept
• Grantee: Luiz Eduardo Nochi de Castro
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/14582-5 - Development of a two-dimensional extraction, separation and analysis system for evaluating the bioactivity of phytochemicals
• Grantee: Maurício Ariel Rostagno
• Support Opportunities: Research Grants - Young Investigators Grants - Phase 2
• FAPESP's process: 18/14938-4 - Waste2energy: integration of supercritical technologies and anaerobic digestion through an automated system for the production of biofuel precursors
• Grantee: Tânia Forster Carneiro
• Support Opportunities: Research Grants - Young Investigators Grants - Phase 2
• FAPESP's process: 19/26925-7 - Development of an automated system for biofuel precursor production using sub-critical technology
• Grantee: William Gustavo Sganzerla
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 20/16248-5 - Purification of jabuticaba waste extracts by adsorbents and biochar using supercritical technology
• Grantee: Tiago Linhares Cruz Tabosa Barroso
• Support Opportunities: Scholarships in Brazil - Master