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Solid state fermentation (SSF) simulates the natural conditions fungal growth, where the amount of water in the reaction medium must be restricted, thus limiting the use of liquid substrate. An analytical strategy to deal with this limitation is the design of blending with constraints. Thus, the objective of the work was to optimize two constrained waste mixtures for the production of lipase by  Penicillium roqueforti  ATCC 10110 under SSF, using different substrates that combine solid and liquid waste. For this, the best fermentation time was determined through a fermentative profile, afterwards a restricted-mix design with lower and upper limits of the components of mixture  I  (cocoa residue, solid palm oil residue and liquid palm oil residue) and  II  (cocoa residue, mango residue and palm oil residue liquid palm) was applied. By means of Pareto and contour graphs, the maximum production points of lipase in mixtures  I  (6.67 ± 0.34 U g −1 ) and  II  (6.87 ± 0.35 U g −1 ) were obtained. The restricted mixture design proved to be a promising tool in the production of lipase by  P. roqueforti  ATCC 10110 under SSF since the use of restrictions is useful when intending to combine solid and liquid residues in fermentation processes.

preparative biochemistry and biotechnology

Application of a constrained mixture design for lipase production by  Penicillium roqueforti  ATCC 10110 under solid-state fermentation and using agro-industrial wastes as substrate