Formulaction TURBISCAN Lab Static Multiple Light Scattering Analyzer

Overview

The Formulaction TURBISCAN Lab is a research-grade static multiple light scattering (MLS) analyzer engineered for non-invasive, real-time stability assessment of concentrated colloidal and particulate dispersions. Unlike dynamic light scattering (DLS) or laser diffraction systems, the TURBISCAN Lab operates on the physical principle of static MLS—measuring both transmitted and backscattered near-infrared (NIR) light intensity profiles across a 55 mm vertical sample path without dilution, agitation, or optical contact. This enables quantitative tracking of all macroscopic and microscopic physical instability mechanisms—including sedimentation, creaming, flocculation, coalescence, Ostwald ripening, and phase separation—in their native state. The system uses a pulsed 880 nm NIR source and two synchronized photodiodes to acquire spatially resolved intensity data at 20 µm intervals, generating a 3D “stability fingerprint” (intensity vs. position vs. time) that reflects localized changes in particle concentration (φ) and hydrodynamic diameter (d). Its ability to analyze samples from 0.01 µm to 1 mm in size and up to 95% v/v concentration makes it uniquely suited for emulsions, suspensions, foams, pastes, gels, and high-solid formulations common in pharmaceuticals, cosmetics, food, coatings, and battery slurries.

Key Features

• Non-destructive, label-free analysis requiring no sample dilution, centrifugation, or rheological pretreatment
• Dual-channel detection architecture: simultaneous acquisition of transmission (T) and backscattering (BS) signals for complementary sensitivity to particle size and concentration gradients
• High-resolution vertical profiling: 2750 data points per scan (55 mm / 20 µm), enabling precise localization of interface movement and stratification onset
• Programmable thermal control: Peltier-based module maintaining temperature between +5 °C above ambient and 60 °C, with ±0.5 °C stability—critical for accelerated aging studies under ISO 22313, ICH Q5C, or ASTM D6045 protocols
• Two operational modes: full-height scanning (1 scan/20 s) for comprehensive instability mapping; fixed-height kinetic mode (1 measurement/s) for high-temporal-resolution monitoring of rapid events such as droplet coalescence
• Modular hardware design supporting optional accessories including magnetic stirrer integration, humidity-controlled chamber, and automated sample changer for unattended multi-sample screening

Sample Compatibility & Compliance

The TURBISCAN Lab accommodates a broad spectrum of industrial and R&D samples—including opaque, highly viscous, or optically dense systems incompatible with conventional optical techniques. Its robust glass cell (Ø 27.5 mm × 55 mm height) with threaded black cap and butyl/PTFE sealing ensures reproducible sample containment and minimizes stray light interference. The instrument complies with essential regulatory frameworks governing analytical instrumentation in regulated environments: data integrity features align with FDA 21 CFR Part 11 requirements (audit trail, electronic signatures, user access levels); raw intensity datasets and derived parameters (TSI, d, φ, migration velocity) are fully traceable and exportable in CSV, XML, and PDF formats. It supports GLP/GMP-aligned workflows through version-controlled method templates, instrument qualification documentation (IQ/OQ/PQ), and compatibility with LIMS integration via TCP/IP or OPC UA protocols.

Software & Data Management

TURBISCAN’s proprietary Turbiscan Analysis Software provides a validated, intuitive interface for method setup, real-time visualization, and advanced stability quantification. Core outputs include: (1) BS and T intensity maps versus time and position; (2) layer thickness evolution curves derived from first-derivative inflection point detection; (3) particle migration velocity calculated from interface displacement over time; (4) hydrodynamic diameter (d) and volume fraction (φ) profiles reconstructed using Mie theory-based inversion algorithms; (5) the Turbiscan Stability Index (TSI), a dimensionless metric integrating all detected instability events into a single time-dependent score; and (6) dispersion index—a normalized parameter evaluating solid powder dispersibility, where lower values indicate poorer homogeneity. All processing algorithms are transparent, user-adjustable, and documented per ISO/IEC 17025 clause 7.2.2. Raw data files are stored with embedded metadata (operator ID, timestamp, environmental conditions, calibration logs) to support full audit readiness.

Applications

• Pharmaceutical development: Stability screening of nanoemulsions, liposomes, microsuspensions, and injectable depots under ICH-guided storage conditions
• Food science: Quantifying creaming kinetics in dairy alternatives, sedimentation in fruit pulps, and fat crystallization in spreads
• Personal care & cosmetics: Assessing emulsion breakdown in sunscreens, silicone phase separation in antiperspirants, and pigment settling in foundations
• Coatings & inks: Monitoring pigment agglomeration in waterborne paints and rheology modifier efficacy in architectural coatings
• Energy materials: Evaluating graphite or silicon anode slurry homogeneity and binder-induced flocculation in Li-ion battery electrode formulations
• Academic research: Fundamental studies on colloidal interactions, depletion forces, and interfacial phenomena in complex fluids

FAQ

Does the TURBISCAN Lab require sample dilution before analysis?

No. The instrument is specifically designed for undiluted, concentrated systems—up to 95% v/v—eliminating artifacts introduced by dilution-related particle rearrangement or interfacial energy changes.
Can it distinguish between flocculation and coalescence?

Yes. Flocculation manifests as increased backscattering without significant change in transmission; coalescence produces concurrent increases in both BS and T due to growth in droplet/particle size and reduction in interfacial area.
Is temperature ramping supported during a scan?

The system maintains isothermal conditions within ±0.5 °C during acquisition. For controlled thermal ramps, users define discrete temperature setpoints with dwell times between scans—enabling stepwise accelerated testing per ASTM E1545 or ISO 11357.
How is the Turbiscan Stability Index (TSI) calculated?

TSI is computed as the standard deviation of the BS profile across the 55 mm scan height, normalized to its initial value and integrated over time. A rising TSI curve indicates progressive heterogeneity; the slope correlates with instability rate.
What validation documentation is provided for GMP use?

Formulaction supplies comprehensive IQ/OQ/PQ protocols, software validation reports (including algorithm verification), and a 21 CFR Part 11 compliance statement—all aligned with Annex 11 and EU GMP Annex 11 expectations.