title: Surimi wash water treatment for protein recovery: effect of chitosan-alginate complex concentration and treatment time on protein adsorption.
abstract: Chitosan (Chi), a protein recovery agent for the treatment of aqueous food processing streams, appears to work by mechanical entrapment and electrostatic interaction of chitosan amino groups with anionic groups on proteins. Chitosan effectiveness for recovering soluble proteins from surimi wash water (SWW) is increased by complexation with alginate (Alg) and by adjusting complex concentration and treatment time. Flocculation at 20 degrees C with Chi-Alg at a 0.2 mixing ratio added as 20, 40, 100 and 150 mg/L SWW was aided by 5 min agitation at 130 rpm and then held at the same temperature for 30 min, 1 and 24 h. Turbidity measurements, protein determinations and qualitative FTIR analysis confirmed SWW protein adsorption which depended on Chi-Alg concentration and reaction time while turbidity reduction was affected by concentration only. No differences (p < 0.05) in protein adsorption were found between 1 and 24 h. Using 100 mg Chi-Alg complex/L SWW for 1 h achieved 83% protein adsorption and 97% turbidity reduction.
authors.affiliation: Food Process Engineering Group, Department of Food Science and Technology, Oregon State University, 100 Wiegand Hall, Corvallis, OR 97331-6602, USA.
authors.forename: Singgih
authors.initials: S
authors.lastname: Wibowo
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Velazquez
authors.forename: Vivek
authors.initials: V
authors.lastname: Savant
authors.forename: J Antonio
authors.initials: JA
authors.lastname: Torres
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D005525:Food-Processing Industry; D011506:Proteins / Q000737:chemistry*; D017747:Seafood; D017550:Spectroscopy, Fourier Transform Infrared; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000737:chemistry*
chemical_list: D000464:Alginates; D011506:Proteins; D014867:Water; D048271:Chitosan