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Protein enrichment of Solanum tuberosum by solid-state fermentation using Aspergillus niger

Abstract:

Potato peel residues have increased due to the high consumption of the tuber; however, biotechnological advances allow us to use these wastes and generate others that are generally improved through fermentation with the help of microorganisms such as Aspergillus niger. In this work, the influence of the fermentation time (5 - 8 days), the stirring speed (0 - 60 rpm) and the concentration of the inoculum (5000 and 50000 conidia / g of medium) on the concentration of biomass and protein were evaluated through a factorial design 23. The statistical analysis determined that the factors with the most significant influence on the analyzed response variables were the stirring speed and the concentration of the inoculum with its maximum levels: 60 rpm and 50000 conidia / g of the medium, respectively. The response variables were maximized with values of 16.31 mg / mL for the protein concentration and 0.94 g / mL for the biomass concentration.