83A-13 |
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S. WIBOWO1, V. D. Savant1, G. Cherian2, T. F. Savage2, and J. A. Torres1. (1) Dept. of Food Science & Technology, Oregon State Univ., Food Process Engineering Group, 100 Wiegand Hall, Corvallis, OR 97331-6602, (2) Animal Sciences Dept., Oregon State Univ., 122 Withycombe Hall, Corvallis, OR 97331-6702 Competition to satisfy human and animal dietary protein needs can be reduced by alternative low-cost feed protein sources such as solids recovered from surimi wash water (SWW). Chitosan has been used to recover proteins but recovery can be improved by using chitosan-alginate (Chi-Alg) complexes with better protein adsorption than chitosan. Objective was to determine the composition, safety and nutritional value of SWW solids recovered using chitosan-alginate complexes. Insoluble solids from SWW (P1) and soluble proteins (P2) coagulated using 150 mg Chi-Alg/L SWW (0.2 mixing ratio) were recovered by centrifugation, freeze-dried and then analyzed for composition and for aminoacid content. Casein controls and diets with P1 at 10% and P2 at 10, 15 and 100% protein substitution were tested on male Sprague-Dawley rats. Evaluations included feed consumption, rat growth, weight gain, protein efficiency ratio (PER), net protein ratios (NPR), feed efficiency, and fecal analysis. Blood chemistry was analyzed to assess liver and renal functions. Blood lipid related compounds were also analyzed to assess the potential lipid binding effect of chitosan. Crude protein contents in P1 (61%) and P2 (73%) were comparable to fish meals and higher than feed ingredients such as soybean meal and corn gluten. AA profile of both pellets was superior to fish meals, especially in its content of histidine, lysine, methionine and phenylalanine. The casein controls and P1/P2 diets showed no significant difference in PER. Blood chemistries revealed no deleterious effects of protein substitution or chitosan. At 100% protein substitution, P2 showed a higher PER and NPR than the casein controls. Proteins recovered from SWW using chitosan-alginate could be used in commercial feed with no deleterious effects creating a market for SWW solids recovered and generating an income to help pay for efforts to reduce the environmental impact of surimi production.
Session 83A, Aquatic Food Products: Byproducts, mince and surimi
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