Formulaction Turbiscan AGS Automated Stability Analyzer (Multi-Angle Light Scattering Instrument)
| Brand | Formulaction |
|---|---|
| Origin | France |
| Model | Turbiscan AGS |
| Particle Size Range | 0.05–1000 µm |
| Concentration Range | up to 95% v/v |
| Temperature Control | 25–60 °C (±0.5 °C) |
| Sample Capacity | 54 positions (3 × 18-well thermostated modules) |
| Scan Resolution | 40 µm along 55 mm height |
| Scan Interval | as low as 20 s per scan |
| Light Source | Pulsed NIR LED (880 nm) |
| Detectors | Synchronized transmission and backscattering photodiodes |
| Compliance | ASTM D7809, ISO 13321, USP <729>, GLP-ready data audit trail |
Overview
The Formulaction Turbiscan AGS is an automated, high-throughput stability analyzer engineered for quantitative physical instability assessment of colloidal and particulate dispersions using patented Static Multiple Light Scattering (SMLS) technology. Unlike conventional techniques requiring dilution or centrifugation, the Turbiscan AGS operates directly on native-concentration samples—enabling real-time, non-invasive monitoring of destabilization phenomena including creaming, sedimentation, flocculation, coalescence, and Ostwald ripening. Its core measurement principle relies on simultaneous detection of transmitted and backscattered near-infrared light (880 nm) across a 55 mm vertical sample path at 40 µm spatial resolution. Variations in light intensity profiles directly correlate with local changes in particle size distribution (via scattering cross-section) and volume concentration (via extinction coefficient), permitting reconstruction of vertical concentration gradients and particle migration kinetics without assumptions about particle shape or refractive index matching.
Key Features
- Automated high-capacity operation: Integrated robotic arm handles 54 samples unattended across three independently controlled thermostatic modules (18 positions each), supporting continuous 7-day testing under defined thermal conditions.
- Precision temperature regulation: Each module maintains setpoints from 25 °C to 60 °C with ±0.5 °C accuracy—critical for accelerated stability studies aligned with ICH Q1A(R3) guidelines.
- Native-concentration analysis: Measures undiluted formulations ranging from 0.05 µm to 1000 µm in particle diameter and up to 95% v/v dispersed phase—eliminating artifacts introduced by dilution or homogenization.
- Dual-channel optical detection: Synchronized transmission (T) and backscattering (BS) signals acquired simultaneously provide orthogonal sensitivity to different destabilization mechanisms—e.g., BS dominates in concentrated systems (>10% v/v), while T excels in low-viscosity transparent emulsions.
- Configurable scanning protocol: Up to 250 user-defined scan sequences; minimum scan interval of 20 seconds; programmable temperature stabilization every 30 seconds ensures thermal equilibrium during dynamic profiling.
- Robust mechanical architecture: Stainless-steel frame, vibration-damped optical bench, and sealed detector housing ensure long-term signal stability and reproducibility across laboratory environments.
Sample Compatibility & Compliance
The Turbiscan AGS accommodates standard cylindrical glass cells (27.5 mm OD × 70 mm height) with threaded black caps and butyl/PTFE gaskets—compatible with aqueous, organic, and high-viscosity matrices including pharmaceutical suspensions, cosmetic emulsions, food colloids, paint pigments, and battery slurries. It supports regulatory-compliant workflows per FDA 21 CFR Part 11 (with optional electronic signature and audit trail modules), GLP/GMP documentation standards, and international method validation frameworks including ASTM D7809 (emulsion stability), ISO 13321 (light scattering particle sizing), and USP (drug product uniformity). All raw intensity profiles, derivative calculations, and metadata are stored in vendor-neutral .csv and .tsi formats for third-party statistical analysis.
Software & Data Management
Turbiscan Analysis Software (v9.x) provides fully traceable data acquisition, processing, and reporting. Core outputs include time-resolved BS/T intensity maps, layer thickness evolution curves, particle migration velocity profiles, hydrodynamic diameter (dH) kinetics, volume fraction (φ) gradients, mean free path (ℓ) modeling, and the proprietary Turbiscan Stability Index (TSI)—a dimensionless metric quantifying overall physical instability magnitude. The software implements automated baseline correction, noise filtering via Savitzky-Golay smoothing, and multi-parameter correlation tools for root-cause analysis. Audit trails log all user actions, parameter modifications, and calibration events in compliance with ALCOA+ principles. Export options include PDF reports with embedded metadata, Excel-compatible datasets, and direct integration with LIMS platforms via ODBC.
Applications
- Pharmaceutical development: Quantitative comparison of generic vs. innovator suspension stability; excipient screening for oral suspensions and injectables; prediction of shelf-life under accelerated storage conditions.
- Food & beverage R&D: Emulsion breakdown kinetics in dressings and dairy alternatives; starch granule swelling behavior; protein aggregation onset in plant-based beverages.
- Personal care formulation: Creaming rate modeling in sunscreens and foundations; silicone droplet coalescence in antiperspirants; rheological synergy assessment in thickened surfactant systems.
- Materials science: Slurry stability evaluation for electrode coatings in lithium-ion batteries; nanoparticle dispersion homogeneity in conductive inks; pigment settling resistance in architectural coatings.
- Quality control: Batch-to-batch consistency verification; release testing for stability-critical products; failure mode identification during out-of-spec investigations.
FAQ
Does the Turbiscan AGS require sample dilution before analysis?
No. The instrument is specifically designed for undiluted, native-concentration measurements—preserving original particle interactions and avoiding dilution-induced artifacts.
What particle size range can be reliably characterized?
The system detects particles from 0.05 µm to 1000 µm based on Mie scattering theory and empirical calibration; optimal resolution is achieved between 0.1 µm and 500 µm for most industrial dispersions.
How does the AGS differentiate between sedimentation and creaming?
By analyzing the directionality and magnitude of vertical concentration gradient shifts in the BS/T profile over time—sedimentation manifests as increasing signal intensity at the bottom, while creaming shows analogous accumulation at the top.
Is temperature control available during scanning?
Yes. Each of the three thermostatic modules operates independently with PID-controlled heating/cooling and real-time feedback—ensuring precise thermal management throughout extended measurement campaigns.
Can the software generate stability rankings across multiple formulations?
Yes. The Turbiscan Stability Index (TSI) enables objective, numerical ranking of comparative stability performance, supporting DOE-driven formulation optimization and regulatory submission packages.
