Journal
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Volume 43, Issue 4, Pages 723-736Publisher
SPRINGER
DOI: 10.1007/s00449-019-02271-x
Keywords
Protein hydrolysate; Single-cell protein; Aquaculture; Downstream processing; Repeated batch
Funding
- Research Council of Norway [237841, 270038]
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The production of microbial protein in the form of yeast grown on lignocellulosic sugars and nitrogen-rich industrial residues is an attractive approach for reducing dependency on animal and plant protein. Growth media composed of enzymatically saccharified sulfite-pulped spruce wood, enzymatic hydrolysates of poultry by-products and urea were used for the production of single-cell protein. Strains of three different yeast species, Cyberlindnera jadinii, Wickerhamomyces anomalus and Blastobotrys adeninivorans, were cultivated aerobically using repeated fed-batch fermentation up to 25 L scale. Wickerhamomyces anomalus was the most efficient yeast with yields of 0.6 g of cell dry weight and 0.3 g of protein per gram of glucose, with cell and protein productivities of 3.92 g/L/h and 1.87 g/L/h, respectively. Using the conditions developed here for producing W. anomalus, it would take 25 industrial (200 m(3)) continuously operated fermenters to replace 10% of the fish feed protein used in Norway.
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