The valorization of the by-product of the agro-industrial processing of jabuticaba (Myrciaria cauliflora) was studied by hydrothermal pretreatment. Experiments were carried out in a semi-continuous flow-through process for 45 min, at 15 MPa, a water flow rate of 5 mL min-1, and at different temperatures (60 - 210 °C). 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 cyanidin-3-glucoside yield (1.88 mg g-1) was achieved at 60 °C. The treatments at 135 and 210 °C promoted the degradation of cyanidin-3-glucoside, leading to yields lower than 0.05 mg g-1. At 60 °C, it was possible to recover 74.18 mg g-1 of glucose, 103.77 mg g-1 of fructose, 30.75 mg g-1 of citric acid, and 1.88 mg g-1 of cyanidin-3-glucoside, without the presence of furfural and 5-hydroxymethylfurfural. The results suggest that hydrothermal pretreatment is a promising eco-friendly technology to recover sugars, organic acids, and anthocyanins from jabuticaba by-products in a circular economy framework.
Keywords: Anthocyanins; Biomass; Biorefinery; Circular economy; Extraction; Hydrolysis; Sugars; Value-added products.
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