Pharmaceutical Particle Size and Stability Analysis Pharmaceuticals
Particle size, morphology and dispersion stability influence how active pharmaceutical ingredients (APIs), excipients and finished formulations behave during development and manufacturing. These properties can affect dissolution, powder flow, blending, compaction, content uniformity and the performance of dispersed, lipid-based or inhaled drug-delivery systems.
MICROTRAC provides complementary analytical technologies for pharmaceutical particle size analysis across dry powders, liquid dispersions, nanoparticles, emulsions, porous solids and aerosols. The resulting data supports formulation development, process understanding, method development and routine quality control from raw-material evaluation through finished-product investigation.
Connect Particle Properties with Pharmaceutical Performance
A fit-for-purpose particle-characterization workflow can help pharmaceutical scientists and quality teams:
- Set and monitor particle-size specifications for APIs and excipients
- Relate pharmaceutical powder morphology to flow, blending and compaction behavior
- Investigate changes caused by milling, granulation or other processing steps
- Compare particle-size and stability conditions in nanoparticle and emulsion systems
- Evaluate lipid nanoparticle stability and other advanced drug-delivery formulations
- Characterize particle or droplet size in inhalation and nasal delivery systems
- Add surface-area and pore-structure information where adsorption or release behavior matters
The most useful technique depends on the dosage form, expected size range, sample state and critical quality question. Combining complementary measurements can reveal information that a single particle-size result cannot provide.
APIs and Excipients: Control Particle Size from Raw Material to Formulation
API particle size analysis is important because changes in particle-size distribution can influence dissolution behavior, powder handling and formulation consistency. Excipients also require appropriate characterization, particularly when their size distribution affects blending, compaction or the uniformity of a solid dosage form.
Laser diffraction provides rapid particle-size distributions across a broad measurement range and can be configured for dry powders or liquid dispersions. For pharmaceutical development and quality control, it is useful for comparing raw-material lots, monitoring process changes and investigating whether milling or dispersion conditions have shifted the particle-size profile.
Combine Size Distribution and Particle Images with SYNC
MICROTRAC SYNC combines laser diffraction with dynamic image analysis in one platform. In addition to measuring the particle-size distribution, it provides image-based information that can help reveal agglomerates and particle-shape differences that may otherwise be hidden in a size-only result.
For APIs, excipients and pharmaceutical powders, SYNC can support:
- Rapid particle-size distribution measurement in dry or dispersed samples
- Comparison of incoming raw-material lots and process conditions
- Detection of agglomerates and oversized particles
- Investigation of particle changes after milling or processing
- Method development when both size and particle-image information are useful
Pharmaceutical Powder Morphology: Flow, Blending and Compaction
Particles with similar size distributions can behave differently if their shapes are different. Aspect ratio, circularity, elongation and agglomeration can influence powder flow, packing, blend uniformity, capsule filling and tableting behavior. For this reason, excipient particle characterization and API analysis may benefit from morphology data in addition to conventional size distributions.
Quantify Powder Size and Shape with CAMSIZER
MICROTRAC CAMSIZER instruments use dynamic image analysis to measure particle size and morphology in powders and granules. Image-based analysis provides quantitative shape parameters while also allowing users to identify irregular particles or agglomerates that may contribute to manufacturing variation.
CAMSIZER measurements can help pharmaceutical teams:
- Quantify aspect ratio, circularity and other shape parameters
- Detect agglomerated or out-of-specification material
- Compare powder lots or granulation conditions
- Investigate flow and blend-uniformity differences
- Support development of oral solid dose processes such as capsule filling and tableting
Surface Area and Pore Structure for Carriers and Controlled-Release Materials
Particle size alone does not describe the internal surface of porous pharmaceutical materials. Specific surface area and pore structure can influence adsorption, dissolution and release behavior in porous excipients, carriers, inhalation powders and controlled-release formulations.
Characterize Surface Properties with BELSORP
The MICROTRAC BELSORP series uses gas adsorption techniques to measure specific surface area and pore structure. These measurements provide additional structural information for materials where available surface and porosity are important to carrier performance or formulation behavior.
BELSORP can support studies involving:
- Porous excipients and adsorptive carriers
- Controlled-release formulation materials
- Inhalation powders and other high-surface-area solids
- Comparison of material lots with similar particle size but different surface properties
Drug-Delivery Nanoparticles and Colloidal Formulations
Advanced drug-delivery systems often operate in the submicron or nanometer range, where colloidal interactions become as important as particle size itself. Drug delivery nanoparticle size analysis therefore needs methods suited to fine dispersions, along with measurements that can reveal whether particles remain separated or begin to aggregate.
Measure Nanoscale Particle Size with NANOTRAC FLEX
MICROTRAC NANOTRAC FLEX uses dynamic light scattering to measure submicron and nanoscale particles in colloids, emulsions and nano-formulations. Its unique probe design and Laser Amplified Detection enable fast, precise measurements directly in concentrated or undiluted samples, preserving real formulation conditions. It is suited to formulations where the hydrodynamic particle-size distribution is a key development or quality parameter.
NANOTRAC FLEX can help scientists:
- Measure particle size in drug-delivery nanoparticles and fine dispersions
- Compare formulation and processing conditions
- Track size changes associated with aggregation
- Evaluate colloids and emulsions that fall below the practical range of broader particle-size methods
Drug-Delivery Nanoparticles and Colloidal Formulations
Advanced drug-delivery systems often operate in the submicron or nanometer range, where colloidal interactions become as important as particle size itself. Drug delivery nanoparticle size analysis therefore needs methods suited to fine dispersions, along with measurements that can reveal whether particles remain separated or begin to aggregate.
Detect Physical Instability Earlier with TURBISCAN
MICROTRAC TURBISCAN uses static multiple light scattering to monitor physical changes throughout a sample. It can detect destabilization phenomena such as creaming, sedimentation, flocculation, aggregation-related changes and phase separation before they are readily visible (up to 1,000x faster than visual observation) and without any dilution.
For pharmaceutical suspensions, emulsions and lipid systems, TURBISCAN can help teams:
- Compare candidate formulations with objective stability data
- Monitor aggregation, sedimentation, creaming and phase separation
- Evaluate lipid nanoparticle stability and parenteral-emulsion behavior
- Shorten the feedback loop during formulation screening
- Identify promising formulations for longer-term validation studies
Surface Charge and Lipid Nanoparticle Stability Analysis
A nanoparticle or emulsion can have the desired initial particle size and still become unstable during storage or handling. Changes in surface-charge conditions can promote aggregation, while dispersed phases may also cream, sediment or separate. For lipid nanoparticles, parenteral emulsions and other advanced formulations, combining size, charge and direct stability information provides a more complete view of formulation behavior.
Compare Colloidal Conditions with STABINO ZETA
MICROTRAC STABINO ZETA uses streaming potential technology for rapid zeta-potential measurement. In suitable concentrated formulations, measurements can be performed without extensive dilution, helping users evaluate the dispersion under conditions closer to the original sample.
STABINO ZETA can support:
- Comparison of surface-charge conditions in colloidal formulations
- Investigation of formulation changes that affect particle interactions
- Screening of conditions associated with aggregation risk
- Complementary analysis alongside nanoparticle size and physical-stability measurements
Used together, NANOTRAC FLEX, STABINO ZETA and TURBISCAN address different parts of the same formulation question: particle size, electrostatic interactions and the physical evolution of the complete dispersion.
Inhalation and Nasal Delivery: Characterize the Delivered Aerosol
Metered-dose inhalers, nasal sprays and other aerosol-based dosage forms require control of the particle or droplet-size distribution that is actually generated during delivery. The aerosol profile can change with formulation, device configuration and actuation conditions, making real-time spray measurement useful during development and quality investigations.
Measure Aerosol and Spray Size with AEROTRAC II
MICROTRAC AEROTRAC II provides high-resolution, real-time measurement of particle and droplet-size distributions in airborne sprays and aerosols. The instrument measures the generated plume directly, allowing scientists to compare delivery conditions without first collecting the spray into another medium.
AEROTRAC II can support:
- Particle-size distribution measurement in metered-dose inhalers
- Characterization of nasal and pulmonary spray systems
- Comparison of formulation, device and actuation conditions
- Development investigations involving the delivered aerosol plume
- Routine comparison of spray performance where particle or droplet size is a critical parameter
Select the Analytical Technique by Dosage Form and Objective
A practical pharmaceutical particle-analysis workflow may use one or several complementary techniques:
For API particle size analysis, excipients, suspensions and broad particle-size distributions, with complementary particle-image information.
For pharmaceutical powder morphology, shape parameters, agglomerates and granules.
For drug-delivery nanoparticle size analysis, colloids and fine emulsions.
For surface-charge and dispersion-interaction studies.
For suspensions, emulsions, lipid nanoparticle stability analysis and accelerated formulation screening.
For inhalation, metered-dose and nasal delivery systems.
For specific surface area and pore structure of porous pharmaceutical materials and carriers.
Combining these techniques gives formulators a clearer understanding of how raw-material properties, dispersion conditions and application parameters influence final coating performance.
Applications in Pharmaceutical Development and Quality Control
- APIs and excipients for oral solid dose formulations
- Pharmaceutical powders and granules
- Suspensions, emulsions and parenteral formulations
- Drug-delivery nanoparticles and lipid-based systems
- Porous carriers and controlled-release materials
- Metered-dose inhalers and nasal sprays
- Topical and other dispersed formulations
Application Notes and Technical Resources
Explore practical measurement examples covering pharmaceutical powders, drug-delivery systems, lipid nanoparticles, parenteral emulsions and inhalation delivery.
Dynamic Image Analysis of Pharmaceuticals Powders
CAMSIZER X2
Evaluation of Distribution of Particles Constituting the Drug Delivery System (DDS) by Size
Define a Particle-Analysis Method for Your Dosage Form
The appropriate analytical method depends on the dosage form, expected particle-size range, dispersion medium and critical quality question. MICROTRAC application specialists can help compare measurement approaches and build a practical workflow around the sample and development objective.
Discuss your pharmaceutical sample and analysis objective with a MICROTRAC specialist.
