Uso da extração supercritica na obtenção de produtos com valor agregado a partir de resíduos sólidos da indústria vinícola

Abstract

The study of the extraction of substances with value-added from waste of the wine industry is proposed due to the annual generating thousands of tons of seeds and cables, called bagasse, coming wineries of the productive region of the northeastern state of Rio Grande do Sul processes. At this moment, this material is perceived as process residue and used only as raw material for composting. Studies show that grape seed (Vitis vinifera L.) may contain compounds with high antioxidant power. The antioxidant power of the extract gives it desirable characteristics for applications in human health, and can be used as food, medicine and cosmetic formulation. In this work the grape waste were collected 20 to 30 days post-pressing and separated into two fractions: one composed only by grape seeds and the other by the remaining material (pulp, peel and bits of curl). Both fractions were subjected to supercritical extraction process using carbon + water and carbon dioxide as solvents. Process operating conditions were: temperature 35 ° C and pressures of 100, 120, 150, 200 and 250 bar, yielding data for construction of yield versus time curves. Then the mathematical modeling was applied to represent the extraction process, this study grounded on the knowledge of mass transfer. Regarding the extracts, they were assessed using DPPH (2,2-diphenyl-1-picryl-hydrazyl), aimed to determining the antioxidant power. As a result, it was observed that the extracts of the pulp, and pieces of bark curl had a high antioxidant power and the mathematical model employed showed high adherence to the experimental data represented by the extraction curve.