Recovery of a protein-rich biomass from shrimp (Pandalus borealis) boiling water: A colloidal study

• Published in: Food Chemistry
• Main Authors: Forghani Targhi, Bita, Ström, Anna, Bordes, Romain, Undeland, Ingrid
• Language: unknown
• Published: 2020
• Subjects: Food Science; Shrimp boiling water Protein Biomass recovery Flocculation Waste water Polyelectrolyte Polysaccharide; Pandalus borealis
• Online Access: https://doi.org/10.1016/j.foodchem.2019.125299; https://research.chalmers.se/en/publication/8b38df37-f3c3-4f73-b150-a48acf73416d

Flocculation and sedimentation of a protein-rich biomass from shrimp boiling water (SBW) using food grade polysaccharides (carrageenan, alginate and carboxymethyl cellulose (CMC)) as flocculants was investigated at different pH-values. The effect of flocculant concentration on particle size and viscosity of SBW was also evaluated. Flocculation with carrageenan (0.45 g/L) at pH = 4 exhibited the most efficient protein sedimentation; protein concentration of the upper phase was here reduced by 77%, allowing 86% protein to be sedimented from SBW. Flocculation by alginate and CMC at pH = 4 showed 67% and 60% protein reduction of the upper phase at concentrations of 0.5 and 0.2 g/L, respectively. Contrary to alginate and CMC, carrageenan concentration affected the size distribution of flocs. Finally, carrageenan at 0.45 g/L and pH = 4 was successfully tested in a scaled up trial (5L) providing 78.5% protein recovery and a biomass with 75% protein on dry weight basis.