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Agrimer : algues marines

Laminaria Digitata

Average chemical composition

  • Dry matter (on wet weight) : 10 - 25 %
  • Mineral residue (on D.M.) : 14 - 29 %
  • Carbohydrates (on D.M.) : 50 - 65 %
  • Proteins (on D.M.) : 5 - 12 %
  • Lipids (on D.M.) : 0,5 - 2 %

Organic residue (average in % on D.M.)

  • Alginic Acid : 32
  • Laminarine : 14
  • Mannitol : 13
  • Cellulosic content : 7,5

Mineral residue (average in % on D.M.)

  • Sodium : 3,9
  • Potassium : 3,
  • Nitrogen : 2,2
  • Sulphur : 1,5
  • Calcium : 1
  • Magnesium : 1
  • Phosphorus : 0,35

Trace elements (average in mg/kg D.M.)

  • Iodine : 5000
  • Iron : 45
  • Zinc : 38
  • Nickel : 7
  • Copper : 5
  • Manganese : 1

Laminaria digitata is a brown algae which has the characteristic of emerging only at spring tides.

In France it is the most exploited algae, and most volume is used for alginate processing. The harvesting period runs from May to October with  boats equipped with an hydraulic arm called a “ Scoubidou ”, rotating and picking up the Laminaria.

Called Kombu in Japan where it is currently eaten, its high Iodine content limits it’s use for human consumption. Laminaria is used in thalassotherapy more particulary for body wraps.

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