Detoxification of Jatropha curcas seed cake using chemical treatment: Analysis with a central composite rotatable design
2014
Guedes, Raquel Escrivane | Cruz, Fabiana de Almeida | Lima, Márcio Cypriano de | Sant’Ana, Luiza D‘Oliveira | Castro, Rosane Nora | Mendes, Marisa Fernandes
Jatropha curcas is a plant whose seeds are rich in oil that can be used for biofuel production, and the seed cake has a high nutritional value. The presence of phorbol ester (PE), a toxic constituent, restricts the cake use in animal food. The detoxification of this by-product is the aim of this work and the seed cake was extracted using Soxhlet for PE removal. A statistical analysis was used to evaluate the PE extraction as function of extraction time, mixture of methanol and ethanol and solute/solvent ratio. The detoxification was reached, reducing the PE content in 97.30% (0.10mg/g) using a mixture of 50% of methanol, extraction time of 8h and solute/solvent ratio of 1:10 (w/v). The treatments had a positive effect on protein content and the dry matter, ash and dietary fiber content ranged from 88.47 to 90.70%, 4.89–6.16% and 33.09–38.23%, respectively.
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