Spectral processes laboratory

Last update: 17 March 2014

The spectral processes laboratory provides analysis of large series of samples of food products by fast, non-destructive and environmentally-friendly methods like Near InfraRed Spectrometry (NIRS) and Frontal Fluorescent Spectrometry.

Spectroscopic analysis by comprehensive fingerprinting

The comprehensive fingerprinting analysis techniques are based on the properties of the organic molecules, which can absorb the energy of a light beam. The selective absorption of red light just after the visible domain, by chemical compounds, makes it possible to identify the constituents of the product: lipids, proteins, caffeine, sugars...

In practice, these constituents are found together and the absorption spectrum of a sample is the sum of all element absorptions. The appearance of this spectrum, a real fingerprint of the product, depends on the chemical composition, which tells us the history of the sample (variety, origin, processing, preparation…).

Field of research 

Strategies of NIRS use are:

  • Creation of robust bases for each product. Example: coffee, cacaa, shea tree, cereals…
  • Creation of global bases with a view to local calibration - E.g.: cassava
  • Use of spectral data to identify individuals of interest: representative of the population or conversely atypical
  • Study of quality determinants, search for bio-markers
  • Development of calibrations to set up protocols of ambitious research protocols (genetic enhancement…)
  • Use of NIRS in the laboratory, to check the analytical results
  • Calibration of qualitative and/or not easily measurable data (adulteration of aromatic rices, authentication of geographic origins...)

Servicing a host of users

The QUALISUD Joint Research Unit has over the years developed many applications implementing these techniques. The development is carried out in collaboration with institutional partners from the South and North, but also with manufacturers.

The expertise of the UMR in the implementation of these techniques, both in laboratory and in the field, meets the needs of producers and processors, providing solutions for production units and laboratories responsible for the implementation of efficient controls.

The integration of comprehensive fingerprinting characterization tools within research projects can increase significantly, at low cost, the number of tests, and generate additional information interpreted using the analysis techniques derived from chemometrics.

Last update: 17 March 2014

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