Stay in touch

Stability & shelf life

Turbiscan: the reference technology for dispersion stability analysis

Colloidal Stability analysis and shelf life determination are key criteria in formulation studies of emulsions, suspensions, and foams. TURBISCAN® is the first patented technology to analyze destabilization mechanisms in concentrated dispersed media and thus the only to offer accelerated aging tests on the actual unstressed products.
Creaming, sedimentation, agglomeration, aggregation, and coalescence of even highly concentrated formulations are detected, at a very early stage, without dilution nor stress. Stability kinetics analysis is provided for an efficient and reliable analysis of samples and to help evaluate the overall quality of formulations a Turbiscan stability Index can be calculated - quantifying the destabilization with a single number.

Key benefits

  • No Sample preparation
  • 200x faster than conventional tests
  • Quantification of stability

Multiple light scattering technology

SMLS is the optical technique of stability analysis to offer the advantage of working in concentrated media: It is well adapted for working without dilution and without stress over a wide particle size range: 10 nm - 1 mm at high concentrations (up to 95% v:v).

The emitted light only partially passes through the tube, most are scattered by the particles in the sample. TURBISCAN® detects the intensity of both Transmitted and Backscattered light over the whole tube height. These intensities allow direct monitoring of local physical heterogeneities with a vertical resolution down to 20µm. Thus, the nascent destabilization phenomenon (sedimentation or creaming layers, aggregates, agglomerates or coalescence) can be detected and monitored over time at different intervals.

TURBISCAN® technology is the perfect solution for a complete analysis and understanding of real-life destabilization phenomena and so shelf life testing. Indeed, the stability of colloidal dispersions depends on many parameters (size, concentration, charges, rheology…). Techniques such as zeta potential testing, particle size determination, conductivity or rheology measurement provide useful but limited information to one parameter and do not characterize the overall stability of formulations 

Read more

Data and key features

  • dispersion stability migration phenomena
  • Formulaction Turbiscan LAB samples
  • Formulaction Turbiscan LAB samples
  • Formulaction Turbiscan LAB result example
  • Formulaction Turbiscan LAB samples
  • Formulaction Turbiscan result examples

> Migration analysis

Local variation of light intensity corresponds to phases formation.

  • Phase separation kinetics and thickness
  • Sedimentation rate
  • Creaming rate
  • Particles migration speed
  • Hydrodynamic diameter
  • dispersion stability - particle size change
  • Formulaction Turbiscan LAB samples
  • Formulaction Turbiscan data example
  • ISO logo

> Size Variation analysis

Global variation of light intensity corresponds to the size increase.

  • Size evolution kinetics 
  • Mean diameter 
  • Agglomeration rate
  • Coalescence rate
  • Dispersibility ratio 
  • Turbiscan Stability Index Scale representation
  • Turbiscan Stability Index Scale representation
  • Turbiscan Stability Index

> Turbiscan Stability Index

Turbiscan Stability Index is a one-click parameter to easily rank the stability of many samples in a kinetic way or in a data table.
The higher the TSI is, the less stable the formulaton. This allows to rapidly determine and quantify  shelf life of various products.

Learn more about the TSI

  • Turbiscan LAB Samples - Clarified layer
  • Turbiscan Tower by Formulaction
  • Turbiscan stability of conc. emulsions

> No mechanical stress

When it comes to shelf-life, and real-life evolution of the end-products, it makes no sense to apply mechanical stress to a sample. Our measurements are always performed at rest, without any external stress. That way, you can be sure that the results you get are representative of what will happen in real life, only detected much earlier!