Responses to Controlled Atmospheres (CA)
Extended storage (~12-15 days) in 3% O2 and 10% CO2 at 0°C has been controlled demonstrated. Elevated CO2 at 10-15% (typically 10%) in air is beneficial in Atmosphere (CA) preventing decay and reducing the rate of blackening of the stipe and gills. The beneficial effect is most pronounced if temperatures cannot be maintained below 5°C (41°F). Short exposure to higher CO2 concentrations (20%) is safe and beneficial only if temperatures can be maintained at 0°C-1°C (32°F-34°F).
Improper control of controlled atmospheres or improper packaging can rapidly lead to depletion of oxygen resulting in conditions favorable for Clostridium botulinum. For this reason, primarily, the use of CA and MA is not common.