Calibration of total nitrogen content in seaweeds (Ulva sp.) by NIRS

Bonnal Laurent, Cacot Philippe, Boissier Guillaume, Hébert Maxime, Thibault Geoffroy, Bastianelli Denis. 2015. Calibration of total nitrogen content in seaweeds (Ulva sp.) by NIRS. In : Proceedings of the 17th international conference on near infrared spectroscopy. ICNIRS. Foz do Iguassu : ICNIRS, pp. 141-143. International Conference on Near Infrared Spectroscopy. 17, Foz do Iguassu, Brésil, 18 October 2015/23 October 2015.

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Bonnal et al calibration nitrogen seaweeds.NIRS2015.pdf

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Abstract : Invasive sea lettuce (Ulva sp.) could be valorized in fish feeding insofar as protein content is increased. Direct NIRS measurement on fresh seaweed was tested as tool for monitoring protein enrichment of algae in different cultivation conditions. Spectra were collected on fresh spin-dried samples of algae with an ASD Labspec Pro spectrometer. The results of NIRS calibrations for dry matter (DM), total nitrogen (N) and total minerals (ash) on fresh samples led robust calibrations with SEP and R2 values of 1.08% and 0.93 for DM, 0.49%DM and 0.95 for N, 2.45%DM and 0.74 for ash. In order to compare calibration precision, calibrations were also developed on dried samples spectra collected on Foss NIRSYSTEM 6500 spectrometer. This study showed the interest of direct NIRS measurement as tool to daily monitoring the enrichment of algae (especially the protein content based on the N content) and its potential for decisions on harvest when N concentration reach a plateau. (Résumé d'auteur)

Classification Agris : F60 - Plant physiology and biochemistry
M12 - Aquaculture production and management
U40 - Surveying methods

Auteurs et affiliations

  • Bonnal Laurent, CIRAD-ES-UMR SELMET (FRA) ORCID: 0000-0001-5038-7432
  • Cacot Philippe, CIRAD-PERSYST-UMR ISEM (FRA)
  • Boissier Guillaume, ISEM (FRA)
  • Hébert Maxime, ISEM (FRA)
  • Thibault Geoffroy, IFREMER (FRA)
  • Bastianelli Denis, CIRAD-ES-UMR SELMET (FRA) ORCID: 0000-0002-6394-5920

Source : Cirad-Agritrop (

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