Pharmaceutical research uses atmosphere control in three specific areas: bioproduction, inhalation product testing, and stability study conditions. These are distinct from the humidity chambers and freeze-dryers used in pharmaceutical manufacturing, which are separate equipment categories.
Bioreactor and cell culture atmosphere
Production of biologics, including monoclonal antibodies, vaccines, and viral vectors, depends on mammalian or microbial cell cultures where dissolved O2 and CO2 are controlled throughout the fermentation. Bioreactors are sparged with a gas stream whose composition is adjusted based on dissolved gas sensor readings. Precise and stable gas supply is a direct input to cell growth rate, productivity, and product quality. Anaerobic and microaerobic conditions for specific microbial processes require CO2/N2 or H2/CO2/N2 blends at defined ratios, often with steps or transitions during the process.
Inhalation product development and testing
Pressurized metered dose inhalers, dry powder inhalers, and nebulizers are tested against breathing simulators and cascade impactors that require controlled gas flow at defined humidity and temperature. Aerosol performance metrics, including particle size distribution and delivered dose, depend on the gas conditions at the test point. A gas mixer with humidification provides the characterised airstream at specified relative humidity and flow rate, allowing reproducible testing across different laboratory conditions.
Stability testing atmospheres
ICH Q1A guidelines require pharmaceutical stability studies at defined temperature and humidity conditions. Where products are oxygen-sensitive, or packaged under modified atmosphere, the O2 partial pressure in the test environment must also be controlled. A gas mixer supplies N2/O2 blends at the required composition, verifiable and traceable, for the duration of the stability study.
Respiratory physiology and breath research
Research on exhaled breath composition, lung deposition of inhaled therapeutics, and gas exchange kinetics requires controlled and characterised reference gas mixtures. Generating known concentrations of CO2, O2, and trace volatile compounds at physiological flow rates allows calibration of breath analyzers and benchmarking of measurement methods against defined conditions.
