Why is sterile air used is fermenters?

Sterile air is used in fermenters to prevent contamination from microorganisms that could compromise the fermentation process. Introducing sterile air ensures that the environment remains controlled and allows for the optimal growth of the desired microbial culture. Additionally, sterile air helps maintain the necessary oxygen levels for aerobic fermentation, supporting the metabolic processes of the microorganisms. This practice is crucial for achieving consistent and high-quality yields in biotechnological applications.