Journal of Applied Phycology

, Volume 29, Issue 5, pp 2417–2426 | Cite as

Nutritional value of the kelps Alaria esculenta and Saccharina latissima and effects of short-term storage on biomass quality

  • Pierrick StévantEmail author
  • Hélène Marfaing
  • Turid Rustad
  • Ingrid Sandbakken
  • Joël Fleurence
  • Annelise Chapman


Storage of macroalgae in seawater, prior to further processing, is a standard initial pre-treatment step after harvest to avoid rapid degradation of the biomass. In the context of using seaweeds in human food and animal feed products, such practice may affect the nutritional value and the overall quality of the biomass. The effects of seawater storage on the chemical composition (i.e., mineral fraction, carbohydrates, proteins, polyphenols, and fucoxanthin) and surface color of two cultivated kelps (Phaeophyceae), Alaria esculenta and Saccharina latissima, were investigated over a 22-h period. Storage treatments resulted in a rapid decrease in dry weight during the first 2 h (−21.4 and −20.4% in A. esculenta and S. latissima, respectively) with subsequent stabilization. Although it is not clear whether the reduction of dry weight was caused by the release of nutritional compounds from seaweed biomass or water uptake during storage treatment, the results from chemical analyses suggest the combined effect of both mechanisms. Seawater storage increased the ash and sodium contents and reduced carbohydrate and polyphenol levels in both species. Among carbohydrates, the levels of mannitol and glucose (laminaran) were particularly reduced in S. latissima samples while the fucose level, reflecting fucoidans, was reduced in A. esculenta. The protein content remained relatively stable in both species. These results provide evidence of the effect of seawater storage on the quality of the edible kelps A. esculenta and S. latissima. The results will contribute to selecting postharvest strategies adequate for maintaining biomass quality, minimizing losses of valuable compounds and increasing profitability for industrial stakeholders.


Alginate Bioactive compounds Carbohydrates Chemical composition analysis Edible seaweeds Fucose Fucoxanthin Laminaran Macroalgae Mannitol Minerals Polyphenols Potassium Preservation Processing Protein Sodium 



This work was conducted as part of the PROMAC project (244244), funded by the Research Council of Norway and part of the Sustainable Innovation in Food- and Bio-based Industries Programme. Pierrick Stévant was supported by a doctoral fellowship from Sparebanken Møre. The authors are also grateful to two anonymous reviewers for their valuable comments and contribution in improving the manuscript.


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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Møreforsking Ålesund ASÅlesundNorway
  2. 2.The Norwegian University of Science and Technology NTNUTrondheimNorway
  3. 3.CEVA (Centre d’Etude et de Valorisation des Algues)PleubianFrance
  4. 4.SINTEF Materials and ChemistryTrondheimNorway
  5. 5.MMS (Mer Molécule Santé)Université de NantesNantes cedex 3France

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