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Response Surface Methodology of Astaxanthin Bioproduction from Agro-Industrial Wastes and Growth Kinetics of Xanthophyllomyces dendrorhous in Solid State Fermentation

Abstract

In this study, solid state fermentation of three different agroindustrial wastes was performed for astaxanthin pigment biosynthesis using Xanthophyllomyces dendrorhous (ATCC 24202). Fermentation conditions were modeled and optimized by response surface methodology. 109.23 μg AX/gdw, 100.25 μg AX/gdw, and 66.03 μg AX/ gdw were the maximum astaxanthin amounts obtained from wheat, lentil and rice wastes, respectively. Moisture content at a 90% level was indicated as the most effective parameter for all fermentation systems. Glucose consumption, cell and product formation as growth kinetics were implemented for the optimized waste, wheat, at the optimum conditions, and the experimental data were modelled. The yield coefficients of each kinetic parameter were calculated to represent productivity. The modelling, optimization and kinetic studies of solid state fermentation as well as the antioxidant capacity of the wastes fulfilled the above requirements.

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