HPAPI BLOG

High-potency active pharmaceutical ingredients, or HPAPIs, are playing an increasingly important role in pharmaceutical development. From oncology programmes to antibody-drug conjugates and other highly potent compounds, more chemistry teams are working with materials where even very small quantities require careful handling.

For process chemists, development scientists and CRO/CDMO teams, this creates a practical challenge. The chemistry still needs to be developed, optimised, scaled and understood, but it often needs to be carried out within more controlled working environments, such as containment hoods, isolators or glove boxes.

That changes the way equipment needs to be selected. Any HPAPI workflow should start with a suitable risk assessment, occupational exposure assessment and containment strategy, defined by the organisation’s own EHS, process safety and quality requirements.

Containment space is valuable

One of the biggest practical challenges in HPAPI work is space.

Containment hoods, glove boxes and isolators are specialist environments. They are costly, limited and often in high demand. Every piece of equipment placed inside them needs to justify the space it takes up.

For early-stage development, screening and small-scale process work, compact equipment can be especially valuable. Scientists need systems that allow them to run meaningful chemistry, collect useful data and maintain good control, without taking up unnecessary space inside containment.

This is where smaller reactor platforms can be useful.

Radleys’ Mya 4 Automated Reaction Station is designed for controlled small-scale chemistry across four independent reaction zones, making it well suited to teams who need to explore reaction conditions without committing to a larger reactor footprint. For jacketed lab reactor workflows, Reactor-Ready Mini offers the benefits of a jacketed reactor system in a smaller format, helping chemists carry out controlled reactions where space is limited.

In HPAPI environments, that compact footprint can be more than a convenience. It can make the difference between a workflow that fits practically within the available containment space and one that becomes difficult to manage.

Small scale still needs meaningful process control

Working at small scale does not remove the need for good process understanding.

HPAPI projects may involve limited material availability, expensive compounds or sensitive chemistry. That means each experiment needs to generate useful information. Precise temperature control, stirring, repeatability, additions and data capture can all matter, even when working with small quantities.

For development teams, this creates a need for equipment that can provide controlled reaction conditions while remaining practical for contained environments.

Mya 4 can support controlled parallel chemistry where teams need to compare conditions, optimise reactions or generate data across multiple small-scale experiments, with active heating and cooling helping chemists manage temperature control across a wide range of reaction conditions. For teams needing a compact jacketed reactor setup, Reactor-Ready Mini provides overhead stirring, controlled heating or cooling, and a workflow that is more representative of a larger reactor system than a round-bottom flask. When automated with AVA Pad, Reactor-Ready Mini can also support more controlled operation and monitoring, which may be valuable when the reactor is being used within a containment hood, glove box or isolator. This can be particularly useful where teams need to bridge the gap between discovery chemistry and more process-relevant development work.

Remote operation can reduce practical handling challenges

When equipment is placed inside an isolator, glove box or containment hood, routine interactions become more complicated.

Adjusting settings, monitoring conditions, starting or stopping a process, or reviewing data may all be less straightforward when equipment is physically separated from the user.

This is why remote operation and automation can be so valuable in contained workflows.

Being able to control or monitor a reactor system from outside the containment environment can reduce unnecessary interaction with equipment inside the enclosure. It can also help scientists manage experiments more consistently and make the overall workflow more practical.

For Radleys reactor systems, control platforms such as AVA can support more automated and controlled operation of compatible equipment, while Mya 4 offers automatic data logging to help chemists capture reaction information consistently across small-scale experiments. In the context of HPAPI workflows, this combination of control, monitoring and data capture can be an important part of designing a practical setup, particularly where direct access to equipment is restricted or where users want to reduce manual intervention.

The containment environment itself is responsible for protecting the user and laboratory. But the equipment placed within that environment still has a major impact on how easy, efficient and controlled the workflow is.

Cleanability, access and workflow design matter

HPAPI workflows also place greater emphasis on cleanability, maintenance access, residual material and cross-contamination risk.

When working with potent or high-value compounds, scientists need to think carefully about how equipment will be set up, used, cleaned and maintained. Areas where material could collect, components that are difficult to access, or workflows that require excessive manual handling can all create practical challenges.

Radleys glass reactor systems are designed to support straightforward cleaning, inspection and routine maintenance. Tool-free assembly allows the reactor to be quickly disassembled and reassembled without specialist tools, giving users convenient access to the glass vessel and associated components. This can help make cleaning between processes more practical and reduce the time needed to reconfigure the system for the next experiment or project.

This accessible design can be particularly useful in laboratories where equipment needs to be cleaned regularly, inspected between runs or adapted for different chemistries. For CROs and CDMOs, where systems may need to support different client projects, reaction conditions and changeover requirements, ease of access and reconfiguration can be an important part of maintaining efficient workflows.

Useful questions to consider include:

  • How much space will the setup take up inside containment?
  • Can the system be operated or monitored from outside the enclosure?
  • How easy is it to access key components for cleaning, inspection or maintenance?
  • Can the system be disassembled and reassembled without specialist tools?
  • Can the system be cleaned or reconfigured efficiently between processes?
  • Does the workflow minimise unnecessary manual handling?
  • Can the setup support the data and control requirements of the process?
  • How will charging, additions, sampling, emptying and cleaning be managed within the containment setup?

Flexibility is essential for CROs and CDMOs

Many HPAPI projects are developed by specialist CROs, CDMOs or process development teams working across multiple programmes.

In these environments, flexibility matters.

A system may need to support different chemistries, scales, vessels, temperature ranges, stirring requirements or data needs from one project to the next. Equipment that can be adapted to different workflows can help teams respond more quickly when new projects are awarded or when process requirements change.

Radleys reactor platforms are designed with flexibility in mind. Mya 4 supports controlled small-scale parallel experimentation, while Reactor-Ready Mini provides a compact jacketed reactor platform for chemists who need a more process-relevant setup in a smaller footprint.

For teams working with high-potency materials, this flexibility can be particularly valuable. It helps laboratories make better use of limited containment space while still supporting controlled, repeatable and application-relevant chemistry.

Choosing reactor equipment for HPAPI development

When selecting reactor equipment for HPAPI development, the wider workflow is just as important as the reactor specification.

A practical small-scale HPAPI setup should take account of:

  • available space inside the containment environment
  • the level of temperature and stirring control required
  • whether remote operation or monitoring would improve the workflow
  • how easily the equipment can be accessed, cleaned and maintained
  • whether the system can adapt to future projects
  • what data needs to be captured during development
  • how the setup will support scale-up or process understanding

These considerations can help teams choose equipment that supports both the chemistry and the practical realities of high-potency work.

Supporting compact, controllable HPAPI workflows

As HPAPI development continues to grow, laboratories will need reactor workflows that are compact, controllable and practical within contained environments.

For many teams, the challenge is not simply running the reaction. For many teams, the challenge is not simply running the reaction. It is running the reaction efficiently and consistently within a validated containment strategy, while managing limited space, restricted access and high-value material handling.

Radleys can support chemists, process development teams, CROs and CDMOs in exploring compact reactor options for high-potency workflows, including Mya 4 for controlled small-scale parallel chemistry and Reactor-Ready Mini for compact jacketed lab reactor applications.

If you are developing HPAPI workflows and need to make the most of limited containment space, speak to Radleys about compact, controllable reactor options including Mya 4 and Reactor-Ready Mini.