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The revision of EU GMP Annex 1 places greater emphasis on minimizing manual glove interventions in aseptic manufacturing environments. As environmental monitoring remains a critical tool for ensuring and documenting aseptic conditions, and is still largely performed manually in many facilities, manufacturers are increasingly required to reassess existing monitoring concepts.
In practice, environmental monitoring in many systems still relies on conventional Petri dishes for active and passive microbial monitoring. The dishes are manually introduced into the isolator, opened, closed again after a defined exposure period, and replaced at regular intervals. Since the culture medium dries out relatively quickly, frequent replacement is necessary. Over the duration of a batch, this can lead to many manual interventions, increasing risks to the aseptic process.
EU GMP Annex 1 requires such interventions to be avoided wherever technically feasible and calls for the traceable, continuous monitoring of critical cleanroom parameters. Larger batch sizes, longer production campaigns, and increasing requirements for documentation and traceability further intensify the need for action. As a result, alternative monitoring approaches are gaining attention, as they can be more effectively integrated into modern, automated production concepts.
Manual handling with modified petri dishes
Environmental monitoring based on conventional Petri dishes is a well-established regulatory approach and continues to be the standard in many facilities. Solutions such as the BioCapt Single-Use Air Sampler build on this principle while significantly reducing manual handling. Its modified Petri dish design maintains sampling capability for up to four hours, enabling both active and passive microbial air sampling with a single dish. This reduces the number of required interventions, although a fully intervention-free monitoring process cannot be achieved without automation.
Automated environmental monitoring
An alternative approach involves the automation of Petri dish handling, in which conventional plates are retrieved from predefined storage and positioned at designated sampling locations. The lid is then opened automatically to activate the collection function. Scan data and time stamps provide full traceability of microbial events and support the precise identification of potentially affected product batches.
Real-time monitoring systems
Real-time monitoring systems follow a fundamentally different approach by detecting particles and viable microorganisms during ongoing production. Using spectral analysis of a defined air sample volume, particles are classified by size and simultaneously analyzed for autofluorescence, enabling the detection of both viable and non-viable particles. In addition, a sample is exposed to this air volume over a defined period and subsequently evaluated after incubation. As these systems are not yet fully accepted by regulators, they are often operated in parallel with conventional Petri dish-based monitoring.
The key differences between the available solutions lie in their level of integration into existing systems, their approach to managing false-positive results, and their ability to precisely localize the contamination source.
All three monitoring approaches share the same goal: reducing contamination risks and enhancing the stability of aseptic processes. Automated and intelligently connected monitoring concepts support continuous monitoring, improve data quality, and provide a solid foundation for decision-making in daily operations and during audits.
EU GMP Annex 1 defines the regulatory framework while intentionally allowing flexibility in technical implementation. Whether a facility relies on manual systems with reduced interventions, automated Petri dish handling, or real-time monitoring depends on the production concept, risk profile, and operational environment.
Optima enables this flexibility with an automated monitoring solution that combines active and passive microbial monitoring with automated particle counting. By minimizing – and potentially eliminating – manual operator interventions, the system helps reduce risks, increases process reliability, and creates future-ready cleanroom operations.
