Therefore, glucose is often added to the culture medium for use with zygotes at the low concentration of 0.2‐0.5 mmol L −1. Dehydrated raw materials, such as peptones, agar-agar and extracts, as well as supplements form part of MilliporeSigma’s extensive portfolio of culture media products for industrial microbiology. Raw materials used in fermentation largely depend on their cost at a particular time, since there are seasonal variations. The concentration of L-glutamine used in classical media is usually 0.002mol/L.