Brown Algae for Materials - AlgeCenter Danmark · Martin Sterner, Ulrica Edlund Fiber- and Polymer...

FA 3 Biorefinery

Martin Sterner, Ulrica Edlund

Fiber- and Polymer Technology

Brown Algae for Materials

Algal biomass

• Alginate

• Laminarin

• Mannitol

• Cellulose

• Protein

• More

Saccharinalatissima

Extraction for material purpose

• Mild extraction with chelation at lower pH

Harsh Mild

Chelation

• Coordinated ionic bonds

C

C

O

O

O-

O-

C

C

O

O

O

O

Ca2+

Ca

Chelation

Chelation in extraction

Chelation strength

Insoluble part

Chelation in extraction

Chelation strength

Insoluble part

Precipitatedalginate

Solubilization of protein

pH

Higher pH

Much higher pH

Protein

Extraction with Sodium Citrate

Solubilized

Insoluble88%

12%

Extraction with Sodium Citrate

Alginate

Laminarin

MannitolProtein

SaltsCellulose 5%Protein 4% Salts 3%

32%

12%

Chelation strength

18%

25%

10%3%

pH

Ion association constant for Ca2+ ion

Alginate

Salts

Ion association constant

Materials that can be made by alginate

• Gels for food and medical applications

• Entrapment material for cells and biocatalysts

• Impression material

• Paper sizing

• Edible coatings

• Ion absorbing materials

• Gelcasting of ceramics