Neste trabalho estudou-se a extração sólido-liquido do flavonoide quercetina a partir da cebola roxa. Estudos experimentais de solvente, temperatura, massa de matéria-prima por volume de solvente e tempo de extração mostraram a melhor condição para a lixiviação: etanol 60% (v/v); 40°C; massa de matéria prima (g)/volume de solvente (mL) 1:10; 2 horas e rotação de 200 rpm; obtendo-se uma recuperação de quercetina de 209,83 mgquercetina/gmatéria-prima e 335,19 mgquercetina/gSST (Sólido Solúvel Total). Com esses valores simulou-se o processo completo de extração com auxílio do software Aspen Plus®. Partindo-se de uma base de cálculo de 1000 kg/dia de matéria-prima obteve-se uma produção de 21,7 kg/dia de quercetina, na forma de extrato alcoólico 40°BRIX. Estimou-se um reciclo do etanol de 788,2 kg/dia, sendo necessário repor 17,8 kg/dia de etanol anidro e 94,3 kg/dia de água no processo.The present work studied the solid-liquid extraction of the flavonoid quercetin from purple onion. Experimental studies of solvent, temperature, raw material mass per solvent volume and extraction time showed the best condition for leaching: ethanol 60% (v/v); 40°C; raw material mass (g)/solvent volume (ml) 1:10; 2 hours and 200 rpm shaking; with a quercetin recovery of 209.83 mgquercetin/graw material and 335.19 mgquercetin/gSST (Total Solid Soluble). With these values the complete extraction process was simulated with the aid of Aspen Plus® software. Starting from a base of calculation of 1000 kg/day of raw material it was obtained a production of 21.7 kg/day of quercetin, in the form of alcoholic extract 40 °BRIX. An ethanol recycle of 788.2 kg/day was estimated, requiring 17.8 kg/day of anhydrous ethanol and 94.3 kg/day of water in the process.
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