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Biomass soaking treatments to reduce potentially undesirable compounds in the edible seaweeds sugar kelp (Saccharina latissima) and winged kelp (Alaria esculenta) and health risk estimation for human consumption

Abstract

Samples of cultivated edible kelps Alaria esculenta and Saccharina latissima were analysed for their cadmium, iodine and inorganic arsenic contents. The inorganic arsenic levels were low in both species but samples of A. esculenta had relatively high cadmium contents (up to 2.01 mg kg−1 dry weight (DW)), and iodine levels were high in S. latissima samples (up to 6568 mg kg−1 DW), exceeding the limits established by the French food safety authority for both elements. Simple soaking treatments in warm fresh water (32 °C) reduced the iodine in S. latissima and treatment of A. esculenta in hypersaline solution (2.0 M NaCl) reduced the relative cadmium content. However, both treatments affected the nutrient content of the biomass, illustrated by considerable variations in DW and the content of bioactive compounds (e.g. minerals, polyphenols, fucoxanthin). Health risks associated with the consumption of these seaweed species were estimated using risk factors based on established tolerable intake levels. The contribution of A. esculenta to dietary cadmium intake does not appear to pose a threat to the consumer while the daily consumption of S. latissima leads to excessive iodine intakes. The moderate consumption of these kelps will, on the other hand, improve the iodine status in iodine-deficient populations.
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Category

Academic article

Language

English

Author(s)

  • Pierrick Francois Denis Stévant
  • Hélène Marfaing
  • Arne Duinker
  • Joël Fleurence
  • Turid Rustad
  • Ingrid Sandbakken
  • Annelise Sabine Chapman

Affiliation

  • SINTEF Industry
  • France
  • University of Nantes
  • Norwegian University of Science and Technology
  • Institute of Marine Research
  • Møre og Romsdal Research Foundation

Year

2017

Published in

Journal of Applied Phycology

ISSN

0921-8971

Volume

Published ahead of print

Page(s)

1 - 14

View this publication at Norwegian Research Information Repository