LUM LUMiReader PSA Stability Analyzer
| Brand | LUM |
|---|---|
| Origin | Germany |
| Model | LUMiReader PSA |
| Measurement Principle | STEP Technology™ (Spatial and Temporal Extinction Profiles) |
| Acceleration Method | Gravimetric Tilt Enhancement (0°–30° tilt, up to 10× g-equivalent separation rate) |
| Detection | Multi-wavelength LED array (470 nm, 525 nm, 625 nm, 850 nm) |
| Optical Sensors | >9,000 high-resolution photodiodes per detector |
| Sample Volume | 0.5–4.0 mL |
| Concentration Range | 0.00015–75 wt% |
| Particle Size Range (PSD) | 500 nm–300 µm (ISO 13317 compliant) |
| Stability Assessment Range | 200 nm–2000 µm |
| Viscosity Range | 0.8–10⁸ mPa·s |
| Density Range | up to 22 g/cm³ |
| Temperature Control | Ambient +3°C to 60°C (±1 K) |
| Tilt Angles | 0°, 5°, 10°, 15°, 20°, 25°, 30° |
| Minimum Acquisition Interval | 0.5 s |
| Data Output | Extinction profiles (E(z,t)), velocity distribution Qᵥ(v), intensity-weighted PSD Qᵢₙₜ(x), volume-weighted PSD Q₃(x) |
| Compliance | ISO/TR 13097, ISO 13317, ASTM D7827, FDA 21 CFR Part 11 (audit trail & electronic signature ready), GLP/GMP-ready architecture |
Overview
The LUM LUMiReader PSA Stability Analyzer is a benchtop instrument engineered for quantitative, non-invasive characterization of colloidal and particulate dispersion stability under real-world conditions. At its core lies the patented STEP Technology™ (Spatial and Temporal Extinction Profiles), a multi-wavelength, whole-sample optical monitoring method that captures extinction profiles—light attenuation as a function of position (z) and time (t)—across the entire sample cell in a single acquisition. Unlike conventional laser diffraction or dynamic light scattering systems, the LUMiReader PSA does not rely on assumptions of spherical particle geometry, homogeneous refractive index, or dilute suspension behavior. Instead, it directly measures sedimentation, creaming, flocculation, coalescence, and phase separation kinetics across the full height of the sample (up to 4.0 mL), enabling simultaneous detection of multiple instability mechanisms—including stratification, interface migration, and density-driven layer formation—under native concentration and ambient or controlled thermal conditions.
Key Features
- Multi-wavelength LED illumination (470 nm, 525 nm, 625 nm, 850 nm) enables differential extinction analysis, improving discrimination between particle types and mitigating refractive index ambiguity.
- Integrated tilt stage (0°–30° programmable) provides gravimetric acceleration—up to 10× effective g-force—without mechanical centrifugation, preserving sample integrity while accelerating separation kinetics for predictive shelf-life assessment.
- Temperature-controlled sample compartment (ambient +3°C to 60°C, ±1 K stability) supports isothermal and accelerated stability testing aligned with ICH Q1A(R3) and ASTM D7827 protocols.
- High-density photodiode array (>9,000 sensors per detector) delivers spatial resolution down to 2.5 µm along the z-axis, capturing localized concentration gradients and transient interfacial phenomena with sub-second temporal resolution (minimum 0.5 s per scan).
- PSA (Particle Separation Analysis) module computes velocity distribution Qv(v) directly from time-resolved extinction data—eliminating dependence on viscosity, density, or particle shape inputs—and derives volume-weighted particle size distributions Q3(x) per ISO 13317 without calibration standards.
- No moving parts in optical path or sample handling; maintenance-free solid-state design ensures long-term measurement reproducibility and operational reliability in QC and R&D environments.
Sample Compatibility & Compliance
The LUMiReader PSA accommodates undiluted, concentrated, opaque, and highly viscous dispersions—including suspensions, emulsions, pastes, slurries, and gels—with densities up to 22 g/cm³ and viscosities spanning three orders of magnitude (0.8–10⁸ mPa·s). Its compatibility extends to industrial formulations where traditional light-scattering techniques fail: asphalt binders, ceramic slips, pharmaceutical suspensions, food emulsions, crude oil/water mixtures, and carbon black inks. The system conforms to international standards for dispersion stability assessment: ISO/TR 13097 (colloidal stability classification), ISO 13317 (particle size distribution by gravitational sedimentation), and ASTM D7827 (standard test method for stability evaluation of emulsions and suspensions). Full 21 CFR Part 11 compliance—including electronic signatures, audit trails, role-based access control, and data integrity safeguards—is embedded at firmware level for regulated pharmaceutical and biotech applications.
Software & Data Management
The proprietary SEPView® software provides an integrated environment for instrument control, real-time visualization, and advanced data interpretation. Users can define custom measurement sequences (e.g., variable-temperature ramps combined with stepwise tilting), apply automated baseline correction and noise filtering, and export raw extinction matrices (E(z,t)) for third-party modeling. Built-in algorithms compute quantitative stability indices (e.g., separation rate, clarification front velocity, flocculation onset time), generate comparative stability rankings, and extrapolate shelf-life predictions using Arrhenius or linear kinetic models. All data files are stored in vendor-neutral HDF5 format with embedded metadata (instrument ID, operator, timestamp, environmental parameters), ensuring traceability and interoperability with LIMS and ELN platforms. Software validation documentation (IQ/OQ/PQ protocols) and GxP-compliant configuration management are available upon request.
Applications
The LUMiReader PSA serves as a primary stability screening tool across formulation development, quality control, and process optimization workflows. In pharmaceutical R&D, it quantifies suspension redispersibility, detects polymorphic transitions in crystalline suspensions, and validates robustness of nanoemulsion drug carriers. In coatings and inks, it correlates pigment settling rates with rheological modifiers and predicts batch-to-batch consistency in high-solids formulations. Food scientists employ it to assess creaming kinetics in plant-based beverages, monitor starch retrogradation in dairy alternatives, and optimize stabilizer systems in dressings and sauces. Petrochemical labs use tilt-enhanced measurements to evaluate water-in-crude emulsion breakage and asphaltene flocculation thresholds. Additionally, academic researchers leverage its high-resolution extinction profiling to validate computational fluid dynamics (CFD) models of particle-laden flows and study colloidal glass transition dynamics under gravity-driven stress.
FAQ
Does the LUMiReader PSA require calibration standards for particle size distribution analysis?
No. Volume-weighted particle size distributions (Q3(x)) are derived directly from first-principles sedimentation modeling applied to measured extinction profiles, per ISO 13317. No reference materials, refractive index input, or shape assumptions are needed.
Can the instrument analyze samples with very high solids content or opacity?
Yes. The multi-wavelength approach and high-sensitivity photodiode array enable reliable measurements in turbid, concentrated, and even near-opaque systems—provided sufficient light transmission remains at ≥ one wavelength.
How does tilt-based acceleration differ from centrifugal methods?
Tilt induces a component of gravitational force parallel to the sample axis, increasing effective sedimentation velocity without introducing shear, particle alignment, or wall effects associated with rotational acceleration. This preserves native dispersion structure and enables direct correlation to real-world storage behavior.
Is temperature uniformity maintained across the full sample height during extended runs?
Yes. The Peltier-based thermal module actively regulates temperature within ±1 K across the entire 40 mm sample length, verified by internal thermistor mapping and traceable to NIST standards.
What data security and regulatory features support FDA or EMA submissions?
SEPView® includes full 21 CFR Part 11 compliance: electronic signatures with biometric or PKI options, immutable audit trails recording all user actions and parameter changes, automatic backup to network drives, and configurable retention policies aligned with ALCOA+ principles.
