Improving Environmental Monitoring Using Rapid Microbiological Methods and PAT
Rohith, Editorial Team, Pharma Focus America
The pharmaceutical industry has focused on improving the efficiency, responsibility and flexibility of production and quality operations. This includes laboratory-based tasks that support decisions in the process and product release. Especially quality control microbiology laboratories can achieve significant operating improvements by using advanced test technologies. Changes in rapid microbiological methods (RMMs) from traditional cultural-based microbiological techniques provide an opportunity to increase environmental monitoring in real time, reduce treatment time and support the implementation of Process Analytical Technology (PAT) framework.
Rapid Microbiological Methods (RMM) offers a variety of technical benefits to traditional microbiological techniques. These include a significantly shorter time for the results of accuracy, sensitivity, accuracy and reproductive results in real time. Modern RMMs are able to detect single cells and can identify viable but non-culturable (VBNC) organisms compared to traditional development-based methods. Further benefits include high test flow, automation capacity, continuous sampling functions and increased data management for strong trend analysis.
Benefits of operating efficiency and cost savings can also be marked through the use of RMM, especially when reducing or eliminating labor-intensive tasks, reducing costs per test and reducing laboratory heads. Economic models such as return on investment (ROI) and Payback Period analysis have been used to assess the value of implementing RMM for applications such as environmental monitoring.
Some technologies have shown the ability to monitor constant, real-time, real time, of viable and non-viable air particles during production operations. These platform processes represent the practical applications of Process Analytical Technology (PAT) principles, so that microorganism tests can be transformed into real-time, in-process environment from laboratory settings. Case studies of the past have shown the use of such technologies in a controlled production environment, including isolators, and reported a fairly long-lasting cost result due to low dependency on consumables and manual interventions. In addition to airborne monitoring, other RMM platforms have been used to detect and determine microorganisms collected through liquid impulse samples.
Real-Time Microbial Particle Detection Technique
Modern airborne monitoring systems for evaluation of environmental microbiological in real time are often based on optical detection principles such as Mie-scattering. In this approach, airborne particles spread light in a way that is correlated with their size, providing the possibility of financing within a specific range of 0.5 to 15 µm. These systems are also used by laser-inspired auto fluorescence to distinguish spores from organic particles such as bacteria, yeast and non-biological substances, which are naturally based on fluorescent biomolecule such as NADH, riboflavin and dipicolinic acid.
Data collection is generally immediate, with the ability to monitor both discrete samples and continuous mode. The air is pulled into the instrument through an inlet and is expelled through the outer gates, where the entire process is controlled through the external software interface. Systems show real-time calculation of viable and non-viable particles and provide both numerical and clinical outputs. These often include size distribution, total and viable particle calculations, and time series trends that support continuous monitoring.
Users can configure threshold levels to accept particle counts in acceptable (green), notice (yellow), or action (red) areas. In the event of a trip, spikes are quickly traced visually in the particle level. The data can be presented as rolling sample values representing particle calculations in defined air volumes (e.g., 1 m³) and also average calculations in full monitoring sessions. This enables immediate evaluation of microbial air quality during production or other important operations.
Further technical information about these principles and methods for detecting is found in current reference texts on fast microbiological methods.
Evaluation of Systems to Detect Real-time Particles in Manufacturing Isolators
A recent assessment examined the performance of real-time environmental monitoring systems, which is able to detect viable and non-viable particles at the same time in the insulator environment. The study was conducted in a pilot-scale function used for parenteral product development. In particular, the surrounding areas were driven, and the particle was not subject to environmental control for the substance, which provides a strong framework for evaluating mean and reliability.
In line with the current acceptance criteria for active air surveillance of both the EU Commission and the US Food and Drug Administration (FDA), a cubic meter was put in a test volume in the air. Configuration alerts and action levels were programmed in software monitoring to match ISO Class 5 (Class A/Class 100) cleanroom standards. For non-viable particles, the notification level was set slightly below the regulatory action limit, while for viable particles, alerts and action levels were equal.
During the evaluation, systems demonstrated continuous surveillance ability under associated insulator conditions and provided detailed, real-time particle data adapted to recognized regulatory expectations. This type of evaluation supports the extensive applications of advanced production and decaying processing environments.
Stable Monitoring for Transfer and Filling
The ability of real-time particle monitoring systems to detect viable and non-viable particles was evaluated through static monitoring in 3-glove, 8-glove, and 12-glove isolators. Particle samples were organized using a Teflon sampling pipe, and the data was constantly collected for cubic meter air samples. Combined results in the table indicate that non-capable particle calculations were continuously within the necessary area for an ISO Class 5 (degree A/Class 100) environment, as defined by the FDA and EU guidelines, and recycled 3520 particles for 0.5-μm particles and 5.0-μm particles.
In all isolators, viable particle counting was consistently recorded as zero meters per cubic meter in accordance with analogy 17 guidelines for the EU, which enabled the average active air level of less than 1 colony-forming unit (CFU) below 1 colony per cubic meter. However, despite a viable particle number of zero, low levels of individual viable particle events were detected during the surveillance sessions. In the 3-glove transfer isolator, seven viable particles were detected; in the 8-glove transfer isolator, eight incidents occurred; and in the 12-glove filling isolator, six viable particles were seen. This was in line with previous conclusions from studies where low levels of viable particles were also detected under equal conditions.
This result presents a deviation from the expectations of the traditional industry to a rotting environment, where there are usually no viable particles in ISO Class 5 settings. An explanation of detecting low levels of viable particles can increase the sensitivity of modern fast microbiological methods compared to traditional development-based techniques. These technologies can detect microorganisms based on cellular feasibility markers, such as riboflavin, NADH, and dipicolinic acid, which can provide the opportunity to identify viable but non-culturable (VBNC) organisms, which have often been missed in traditional ways due to the ability to grow.
In addition, low experimental particle may be responsible for detecting increased collection efficiency of air particles in real-time cutting as well as real-time surveillance systems that will be solved by traditional methods otherwise. It is important to note that these studies occur in an unnecessary, uncontrolled environment, where the concentration of viable particles can usually be higher than in a regulated production environment. The HEPA filters in isolators are not perfectly effective, and it turns out that the particles have fallen within the size of non-capable particles that are usually allowed in the ISO 5 environment.
The results also raise questions about how detecting viable low-level particles under continuous monitoring can affect the current regulator's expectations. In some cases, regulatory bodies such as the FDA and EMA may consider changing the acceptance criteria, as the use of more sensitive technologies can detect more than traditional methods. In fact, the FDA guidance suggests that new or faster microbiological methods are found.
Chemunex Scan RDI
The Chemunex Scan RDI system is an established rapid microbiological method (RMM) that has been used for more than a decade, mainly to detect and determine microorganisms in filterable fluids such as clean water, in-process samples, and finished products. Recently, the system has also been used for environmental monitoring in cleanroom settings through integration with liquid power-based air sampling technologies.
Such a compatible device is the Choriolis® µ Air sampler, which collects air microorganisms in a liquid medium. The collected liquid is then filtered on a fixed support membrane, which acts as a microbial detection substrate by scanning RDI. The process involves the use of a stain (Chemunex Fluorassure), which is designed to label a selective viable microorganism.
Conclusion
An effective environmental monitoring program (EM) should be meaningful, controlled, and defensive. The primary function is to assess the control condition in the production environment and offer reliable data and trend analysis to support quality assurance efforts. To be scientifically valid for such programs, they should be used properly, provide actionable insights, and follow the regulatory expectations.
However, in traditional EM practice, one of the long-term challenges depends on culture-based techniques. These methods depend on microbial development, which often requires several days to generate countable colonies. Consequently, any deviation from the established acceptance criteria can only be rebuilt and investigated retrospectively and often produces incredible results.
Author Bio
Rohith, Editorial Team at Pharma Focus America, leverages his extensive background in pharmaceutical communication to craft insightful and accessible content. With a passion for translating complex pharmaceutical concepts, Rohith contributes to the team's mission of delivering up-to-date and impactful information to the global Pharmaceutical community.
