Optimization of response surface for fermented feed in Idesia polycarpa residues through solid-state fermentation

Abstract:

In this study, response surface methodology (RSM) was performed the optimization of the fermentation of Idesia polycarpa residues, and Candida utilis was selected for solid-state fermentation. Five influences of the fermentation were studied by one-factor tests, and the Plackett-Burman experiment subsequent confirmed three main influences for Box-Behnken RSM design. Optimized conditions of the fermentation as follow: residues with ratio of solid to liquid 1:1.2, NH4NO3 additive amount 8.8%, and Candida utilis inoculation 10.5% fermented in 30℃ for 4 days. Fermentation results showed that, the crude protein content of fermented feed increased from 8.49% to 19.13%, and the nutrition ratio of products became more reasonable. This study suggests that Idesia polycarpa residues have a real potential on the modern farming by the solid-state fermentation.