Electronic Tongue
Instrument for sensory analysis of taste

ASTREE Electronic Tongue

In a way similar to the human tongue, the ASTREE electronic tongue performs a global taste assessment of a complex mixture of dissolved organic or inorganic compounds.

This instrument detects all compounds responsible for taste in liquid samples and allows comparing various products based on their taste profile. The electronic tongue not only assesses basic tastes (sweet, bitter, sour, salty, umami) but also all other gustatory components (metallic, pungent, astringent, etc).


Advantages of ASTREE electronic tongue

  • Reproducible and reliable taste evaluation
    full & automated sensor analysis procedure, controlled measurement conditions
  • Sensitivity
    to a wide range of taste compounds, with a detection threshold equivalent or better than human sense of taste
  • Fast analysis run
    3 minutes per sample

Technical features of ASTREE electronic tongue

ASTREE features a unique combination of technical characteristics in sampling, detection, and data processing that make it the most powerful and flexible electronic tongue.



Electronic Tongue sampling devices

Electronic Tongue autosamplers & sampling options

Autosampler Astree Electronic Tongue

E-Tongue systems include an autosampler to run a sample sequence and automate analysis.

  • • Tray with 16 or 48 beaker positions
  • • Optional thermo-regulated tray with 15 beaker positions
  • • Automated monitoring of the sensor head, with integrated stirring for measurement


Advantages

  • • High throughput of analysis
  • • Automated operations
  • • Reproducible operating and analytical conditions
  • • Flexibility of devices and options

Liquid & Solid Sampling Devices

Gravimetric Dilutor

Two sampling accessories help optimize liquid and solid sample preparation prior to smell, VOC or taste analysis, especially for food & beverage applications:

  • The gravimetric dilutor for automated weighing of the sample & diluent based on the desired dilution rate
  • The lab blender for automated crushing and homogenization of samples, to transform solids into liquids and provide samples free of particles using filter bags

Advantages

  • • Insures that the analyzed portion of the sample is representative of the whole product
  • • Guarantees homogeneous & repeatable samples

Electronic Tongue detection technology

ASTREE Electronic Tongue uses sensors based on the ChemFET technology (Chemical modified Field Effect Transistor) for liquid samples analysis. In the presence of dissolved compounds, a potentiometric difference is measured between each of the 7 sensors and the reference electrode. Each sensor has a specific organic membrane, which interacts with ionic, neutral & chemical compounds present in the liquid sample in a specific manner. Any interaction at the membrane interface is detected by the sensor & converted into an electronic signal.

The potentiometric value at equilibrium is recorded as the raw data for data processing.
Detection Astree electronic tongue


Electronic Tongue data processing software

A common and unique platform of the AlphaSoft software monitors all electronic noses, electronic tongue and electronic eye from Alpha MOS range. Compatible with Windows XP/Vista/7, AlphaSoft is available in 7 languages: English, French, Spanish, German, Japanese, Chinese, Korean. AlphaSoft uses multivariate statistical analysis and chemometrics to acquire, compute and interpret electronic tongue measurements.

AlphaSoft offers various data processing models and different decision tools for qualitative or quantitative analysis in taste evaluation:


Data processing Astree electronic-tongue


Principal Components Analysis (PCA)
Discrimination Factorial Analysis (DFA)
Group Distance Shelf life over time Partial Least Square (PLS)
Comparative mode
Comparison of numerous samples
Taste map
Indication of similarity/difference
Taste masking evaluation application
Taste change over time
Best-before date
Prediction of quantitative parameters: concentration, sensory attribute intensity
  • • Taste measurement in liquid matrix: analysis of liquid products or solids dissolved in a liquid
  • • Automated taste analysis using a carrousel autosampler (16 or 48 positions), with programmable sample sequence run, reproducible stirring and measurement conditions, possible thermo-regulation of the sample tray
  • • ChemFET sensor technology (Chemical modified Field Effect Transistor) using potentiometric measurement: 7 cross-selective liquid sensors sensitive to ionic, neutral & chemical compounds responsible for taste
  • • 2 standard sets of taste sensors available: one for food & beverage applications, one for pharmaceutical applications
  • • Optional Taste Ranking Module allowing to classify similar products based on their intensity over specific taste attributes such as sweetness, bitterness, sourness, saltiness, umami, etc
  • • Powerful AlphaSoft software: instrument monitoring, sensors signal acquisition, qualitative and quantitative analysis using multivariate statistics data processing and chemometrics.

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