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Assessing Mineral Availability in Fish Feeds using Complementary Methods Demonstrated with the Example of Zinc in Atlantic Salmon
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Metals in edible seaweed.

C Rubio1, G Napoleone1, G Luis-González1

  • 1Area de Toxicología, Universidad de La Laguna, 38071 La Laguna, Tenerife, Canary Islands, Spain.

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|February 3, 2017
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Summary
This summary is machine-generated.

Edible seaweed analysis reveals red varieties contain higher trace elements. While consumption poses no serious health risks from aluminum, cadmium, and lead, monitoring other toxic metals is advised.

Keywords:
Dietary intakeFood analysisInductively coupled plasma optical emission spectrometry (ICP-OES)MetalsSeaweed

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Area of Science:

  • Food Science
  • Environmental Chemistry
  • Marine Biology

Background:

  • Edible seaweeds are increasingly consumed globally.
  • Understanding metal accumulation in seaweed is crucial for food safety.
  • Cultivation practices and origin can influence seaweed's nutritional and contaminant profile.

Purpose of the Study:

  • To quantify metal concentrations in various edible seaweeds.
  • To compare metal levels based on origin (Asia vs. EU) and cultivation (conventional vs. organic).
  • To assess dietary intake and potential health risks associated with metal consumption from seaweed.

Main Methods:

  • Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES) was used for metal analysis.
  • Twenty metals were quantified in eight species of edible seaweed.
  • Data were analyzed to compare concentrations based on origin and cultivation methods.

Main Results:

  • Red seaweeds exhibited higher concentrations of trace and toxic elements.
  • Significant differences in mean metal content were observed between Asian and European seaweed origins.
  • Conventional cultivation yielded higher cadmium (Cd) levels (0.28 mg/kg) compared to organic (0.13 mg/kg).
  • Porphyra species showed potential as a bioindicator for metal accumulation.

Conclusions:

  • Daily seaweed consumption (4 g/day) contributes to dietary intake of essential and non-essential metals.
  • Dietary intake of analyzed toxic metals (Al, Cd, Pb) from seaweed is unlikely to cause serious health concerns.
  • Continuous monitoring of other toxic metals in edible seaweeds is recommended.