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A torta de pinhao-manso ( Jatropha curcas L.), coproduto do processo de obtencao do biodiesel, apresenta um percentual significativo de carboidratos polimericos em sua composicao. Uma estrategia atraente para o aproveitamento dessa biomassa seria a biotransformacao de seus carboidratos para a producao de etanol. Nesse contexto, o presente estudo teve por objetivo avaliar a composicao da torta de pinhao-manso, bem como promover a otimizacao do processo de sacarificacao enzimatica da fracao amilacea contida na torta e avaliar, tambem, a fermentabilidade do hidrolizado enzimatico para producao de bioetanol. O planejamento experimental utilizado seguiu um modelo Composto Central Rotacional (CCR), cujos fatores avaliados foram o tempo de hidrolise e a concentracao de enzima amilolitica, resultando em rendimento hidrolitico de 90%. O processo fermentativo realizado com Saccharomyces cerevisiae e o hidrolisado amilaceo derivado da torta de pinhao-manso apresentou valores de eficiencia fermentativa de 100%. O uso da torta de pinhao-manso para producao de bioetanol pode ser uma estrategia eficiente se associada a cadeia produtiva do biodiesel como forma de agregar valor a um coproduto abundante e como alternativa para producao de uma fonte de energia renovavel.  Abstract Jatropha seed cake ( Jatropha curcas L.), co-product from biodiesel process, presents a significant percentage of polymeric carbohydrates in its composition. An attractive strategy for the utilization of this co-product would be the biotransformation of their carbohydrates to ethanol. In this context, this study aimed to evaluate the composition of the jatropha seed cake, as well as promote the enzymatic saccharification of starchy fraction contained in the cake and evaluate the fermentability of the its enzymatic hydrolyzate to produce bioethanol. The experimental design utilized to improve the saccharification process followed a central composite rotational model (CCR), whose factors evaluated were the hydrolysis time and enzyme concentration, resulting in 90% of hydrolytic yield. The fermentation process carried out with Saccharomyces cerevisiae and the starch hydrolyzate from jatropha seed cake pointed 100% conversion of reducing sugars to ethanol. The use of jatropha seed cake for bioethanol production can be an effective strategy if associated to the biodiesel production chain as a way to add value to an abundant co-product and as an alternative for the production of a renewable source of energy.

Composition, enzymatic saccharification and fermentability of jatropha cake for bioethanol production