Stability Research
Stability studies are an important component of pharmaceutical development and CMC activities. They provide information on how the quality of an API, intermediate, drug product, or other pharmaceutical material changes over time under defined environmental conditions. Protheragen provides stability research services to evaluate the physical, chemical, and, where applicable, microbiological stability of pharmaceutical materials throughout development. Our studies can support early-stage development, formulation and process optimization, shelf-life assessment, packaging evaluation, regulatory development, and post-development change assessment.
Overview of Stability Research
Stability research typically involves evaluating product quality over time under controlled temperature, humidity, light, and other relevant conditions. Analytical testing is used to monitor changes in assay, impurities, degradation products, physical properties, and other critical quality attributes.
Depending on the development objective, stability programs may include long-term stability studies, accelerated stability studies, photostability studies, stress testing, forced degradation studies, and stability assessments following process or formulation changes.
Fig.1 Stability indicating assays for pharmaceutical products. (Chew Y, et al., 2021)
Our Services
Protheragen offers flexible stability study programs to evaluate changes in product quality under defined storage and stress conditions. Our services cover routine stability studies, accelerated and photostability testing, forced degradation, and stability assessments following process or product changes.
Long-Term Stability Studies
Long-term stability studies are conducted under defined storage conditions to monitor product quality over the intended development period.
Testing includes:
- Assay and purity
- Related substances and degradation products
- Physical appearance
- Water content
- Dissolution or other performance attributes
- Solid-state or physicochemical properties
- Other product-specific quality attributes
Long-term studies can provide data for understanding product stability and supporting shelf-life and storage-condition assessments.
Accelerated Stability Studies
Accelerated studies evaluate product behavior under elevated environmental conditions and can provide early information on potential degradation pathways and stability risks.
Accelerated studies can be used to:
- Identify potential degradation trends
- Compare formulations or material batches
- Evaluate process-related stability risks
- Support early development decisions
- Complement long-term stability programs
Photostability Studies
Photostability studies evaluate the effects of controlled light exposure on pharmaceutical materials and products.
Testing can assess changes in:
- Assay
- Related substances
- Degradation products
- Appearance
- Physical properties
- Other relevant quality attributes
Photostability studies can help identify light-sensitive components and support appropriate handling, storage, and packaging strategies.
Forced Degradation & Stress Studies
Forced degradation studies expose materials to selected stress conditions to promote degradation and investigate potential degradation pathways.
Common stress conditions include:
- Acidic conditions
- Basic conditions
- Oxidative conditions
- Thermal stress
- Humidity
- Light exposure
The resulting degradation products can be characterized using appropriate analytical techniques. Forced degradation studies are particularly useful for understanding degradation behavior and supporting the development of stability-indicating analytical methods.
Stability Assessment Following Process Changes
Stability studies can be performed following changes to manufacturing processes, raw materials, equipment, process parameters, or other development variables. Comparative stability assessment can help evaluate whether process changes have an impact on product quality and stability.
Potential applications include:
- Process parameter changes
- Manufacturing site changes
- Raw material changes
- Equipment or scale changes
- Purification process changes
- Formulation changes
Post-Development & Marketed Product Stability
Stability research can also support products that have progressed beyond early development. Studies may be used to investigate product quality following manufacturing or process changes and to monitor stability characteristics during the product lifecycle.
Potential applications include:
- Ongoing Stability Studies
- Process Change Assessment
- Formulation & Manufacturing Changes
- Accelerated Stability Assessment
- Forced Degradation Studies
- Comparative Stability Assessment
Stability Studies Across the CMC Lifecycle
The analytical capabilities can be integrated throughout the CMC development lifecycle, from early-stage API characterization and process development to method validation, stability studies, and routine release testing.
| CMC Stage |
Stability Support |
| Early Development |
Initial stability assessment to identify potential degradation pathways and stability risks. |
| Process Development |
Stability evaluation to assess the impact of process parameters, material characteristics, and process changes on product quality. |
| Formulation Development |
Comparative stability studies to evaluate formulation composition and identify suitable formulation conditions. |
| Analytical Development |
Forced degradation and stress studies to support the development and evaluation of stability-indicating analytical methods. |
| Clinical Development |
Stability studies to support storage conditions and quality assessment of materials used during development. |
| Late-Stage Development |
Long-term and accelerated studies to generate stability data for development and regulatory purposes. |
| Post-Development |
Stability assessment following manufacturing, formulation, process, or other product changes. |
Stability Testing Conditions
Stability conditions are selected according to the product characteristics, study objective, development stage, and applicable requirements.
Controlled temperature and relative humidity conditions can be applied to evaluate the effects of environmental exposure on product quality.
Controlled light exposure can be used to assess photodegradation and determine the potential need for light-protective packaging or storage conditions.
Additional stress conditions can be incorporated when required to investigate specific degradation mechanisms or product-related stability risks.
The study design, sampling schedule, storage conditions, and analytical testing program can be customized according to project requirements.
Stability-Indicating Analytical Evaluation
Reliable analytical methods are essential for detecting and monitoring changes during stability studies. Protheragen can integrate stability testing with analytical method development and quality assessment to monitor relevant critical quality attributes.
Depending on the product, analytical evaluation may include:
- Assay
- Related substances
- Degradation products
- Residual solvents
- Water content
- Elemental impurities
- Chiral purity
- Dissolution
- Physical appearance
- Particle size distribution
- Solid-state properties
- Other product-specific attributes
Where appropriate, chromatographic and spectrometric techniques can be used to investigate degradation products and distinguish degradation-related changes from other sources of variability.
Typical Applications
Protheragen's stability research services can support:
- API Stability Studies
- Intermediate Stability Assessment
- Drug Product Stability Studies
- Long-Term Stability Studies
- Accelerated Stability Studies
- Photostability Studies
- Forced Degradation Studies
- Stress Testing
- Process Change Assessment
- Formulation Comparison
- Packaging Evaluation
- Stability-Indicating Method Development
- Degradation Pathway Investigation
Why Choose Protheragen
- Integrated Analytical Support
Stability studies can be integrated with analytical method development, impurity profiling, and physicochemical characterization to provide a comprehensive assessment of product quality.
Study conditions, sampling schedules, analytical testing, and duration can be tailored to the product, development stage, and specific study objectives.
- Development-Focused Approach
Stability data can be used not only for routine monitoring but also to support formulation optimization, process development, impurity control, and identification of potential stability risks.
Protheragen can provide stability research support from early-stage development through clinical development, late-stage CMC activities, and post-development change assessment.
Protheragen integrates stability research with analytical development and broader CMC activities to help clients understand product behavior over time. By combining controlled stability studies with appropriate analytical evaluation, Protheragen supports the identification of degradation risks, assessment of product quality, and development of appropriate storage and handling strategies throughout the product lifecycle. Contact us to discuss your stability study requirements and develop a stability program tailored to your product and development stage.
Reference
- Chew Y, et al. "Choices of chromatographic methods as stability indicating assays for pharmaceutical products: A review" Heliyon. 2021; 7(3).
