Pré-tratamento hidrotérmico baseado em configurações em reator unitário e sequencial de fluxo semicontínuo para a recuperação de biocompostos da casca da jabuticaba (Myrciaria cauliflora)

Author(s)

Tiago Linhares Cruz Tabosa Barroso

• Document type: Master's Dissertation
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia de Alimentos
• Defense date: 2023-07-31

Examining board members

Tânia Forster Carneiro; Ítalo Waldimiro Lima de França; Maria Thereza de Moraes Gomes Rosa

• Advisor: Maurício Ariel Rostagno; Tânia Forster Carneiro

Abstract

The valorization of the jabuticaba ("Myrciaria cauliflora") agro-industrial processing by-product was studied by hydrothermal pretreatment. The management of these byproducts is of growing interest, as they may contain valuable components that can be utilized for various purposes. This study evaluated the unitary reactor configuration and a new process composed of two sequential flow reactors. Both systems were operated at 15 MPa, with a water flow of 5 mL min-1, and 10 g of jabuticaba peel was fed into each reactor. For the unitary reactor process, temperatures of 60, 135 and 210 °C were evaluated, and the sequential process was evaluated by varying the same temperatures using a design of experiment (DOE). For the unitary reactor configuration, the results demonstrate that fructose and glucose were the sugars with the highest concentration in all analyzed treatments. Arabinose and cellobiose were obtained only at higher temperatures (above 130 °C), demonstrating that they were released from the hydrolysis of polysaccharides. The highest yield of cyanidin-3-glucoside (1.88 mg g-1) was obtained at 60 °C. Treatments at 135 and 210 °C promoted cyanidin-3-glycoside degradation, leading to yields below 0.05 mg g-1. At 60 °C, it was possible to recover 74.18 mg g-1 glucose, 103.77 mg g-1 fructose, 30.75 mg g-1 citric acid and 1.88 mg g-1 cyanidin-3-glycoside without the presence of furfural and 5-hydroxymethylfurfural. In the process in sequential reactors, the results showed that the two sequential reactors at 135 °C followed by 60 °C increased monosaccharides (160.74 mg g-1), cyanidin-3-glucoside extraction (0.78 mg g-1) and total phenolic compounds (0.58 mg g-1). Inhibitor formation was more evident in the two sequential reactors at 210 °C. The proposed configuration in sequential reactors allowed promising results; however, further adjustments of the operating parameters are still needed to achieve higher yields. The results demonstrated that hydrothermal pretreatment is a promising ecological technology to recover sugars, organic acids and anthocyanins from jabuticaba by-products in a circular economy framework (AU)

• 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