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FA 3 Biorefinery
Martin Sterner, Ulrica Edlund
Fiber- and Polymer Technology
Brown Algae for Materials
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Algal biomass
• Alginate
• Laminarin
• Mannitol
• Cellulose
• Protein
• More
Saccharinalatissima
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Extraction for material purpose
• Mild extraction with chelation at lower pH
Harsh Mild
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Chelation
• Coordinated ionic bonds
C
C
O
O
O-
O-
C
C
O
O
O
O
Ca2+
Ca
Chelation
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Chelation in extraction
Chelation strength
Insoluble part
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Chelation in extraction
Chelation strength
Insoluble part
Precipitatedalginate
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Solubilization of protein
pH
Higher pH
Much higher pH
Protein
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Extraction with Sodium Citrate
Solubilized
Insoluble88%
12%
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Extraction with Sodium Citrate
Alginate
Laminarin
MannitolProtein
SaltsCellulose 5%Protein 4% Salts 3%
32%
12%
Chelation strength
18%
25%
10%3%
pH
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Ion association constant for Ca2+ ion
Alginate
Salts
Ion association constant
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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