Source: https://ensaiospioneiros.usf.edu.br/ensaios/article/view/125
Timestamp: 2019-04-21 15:07:26+00:00

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Este trabalho teve como objetivo avaliar a tecnologia supercrítica com dióxido de carbono e adição de cossolventes na obtenção do extrato das folhas de cravo da índia (Syzygium aromaticum). Os experimentos foram realizados com CO2 a 40 oC e 220 bar, com vazão volumétrica de 2 mL min-1 e tempo total de 80 min. Os cossolventes etanol e acetato de etila foram adicionados às folhas de cravo nas proporções de 15, 20 e 25 % (m/m). Os extratos foram caracterizados quanto à concentração do composto eugenol empregando a cromatografia líquida de alta eficiência. O maior rendimento foi obtido na condição de extração com adição de 25 % do cossolvente etanol, 1,33 %, correspondendo a um aumento de 45 % no rendimento em relação à extração sem cossolvente. No entanto, avaliando o rendimento da extração e a concentração de eugenol, verificou-se que a condição de extração com adição de 20 % de etanol foi a mais favorável para o rendimento deste composto, 3,59 geugenol kgfolhas-1. Em relação às cinéticas das extrações, o modelo matemático de Sovová se ajustou satisfatoriamente aos dados experimentais.
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