83A-14 |
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P. MENDOZA-SANCHEZ1, S. Wibowo2, V. D. Savant2, J. Huerta-Ruelas1, and J. A. Torres2. (1) OSU Food Process Engineering Group, CICATA-IPN, Jose Siurob 10, Col. Alameda, Queretaro, 76040, Mexico, (2) Dept. of Food Science & Technology, Oregon State Univ., Food Process Engineering Group, 100 Wiegand Hall, Corvallis, OR 97331-6602 Surimi wash water (SWW) contains soluble protein which can be recovered by chitosan-alginate complexes and used as an animal feed component. Turbidity reduction is a function of time and polymer dose and is typically measured using a nephelometer. An on-line system to monitor this process in situ could be developed based on scattered light, transmitted light and optical activity measured during the adsorption process. This system could be potentially used as a process monitoring tool. To evaluate turbidity reduction in SWW using a real time, in-situ optical system. Chitosan (1%) with 84% degree of deacetylation was purified. SWW was obtained from an Oregon processing plant and allowed to react with chitosan-alginate (Chi-Alg) complexes (100 mg Chi-Alg/L of SWW) according to published methods. Flocculation with a Chi:Alg monomeric mixing ratio of 0.2 was aided by agitation at 130 rpm, 20oC for 5 min. Sample was allowed to stand at room temperature for 1h. Turbidity was measured according to the EPA protocol before and after 1 h treatment as well as monitored in situ using a modular optical measurement system measuring scattered light, transmittance and optical rotation. Turbidity reduction as a function of time was successfully demonstrated using both light scattering and transmittance modes. As turbidity of the sample decreased, measured transmittance increased. Scattered light data showed the opposite behavior, thereby confirming turbidity reduction. Changes in optical rotation during the precipitation process provide a measure of compounds trapped which are optically active. Nephelometric measurements showed reduction in turbidity by over 90% and were correlated with optical measurements. The high sensitivity of optical measurements and the modular construction of the system demonstrated the potential of the method as an in-situ technique for monitoring of the flocculation process during SWW treatment.
Session 83A, Aquatic Food Products: Byproducts, mince and surimi
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