Statistical optimization of arachidonic acid synthesis by Mortierella alpina CBS 754.68 in a solid‐state fermenter

Arachidonic acid (ARA) is an omega‐6 fatty acid that plays a major role in human health. The present study optimizes the production of ARA by the soil fungus Mortierella alpina CBS 754.68 on oil cakes. In the first step, the best substrate was chosen from four oil cakes, namely soybean, sunflower, olive, and colza oil cakes, of which sunflower oil cake showed the highest yield. In the next step, screening tests were performed using the Plackett‐Burman design. Seven variables (substrate particle size, moisture content, time, temperature, yeast extract, glucose, and glutamate) were investigated (each taking values of +1 and −1). Among these variables, time, temperature, and substrate particle size significantly affected ARA production (p