Solids Extraction of Cod Frame and Effects on Ultrafiltration of the Aqueous Extract
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Grinding, pH adjustment, heat treatment and centrifugation were studied to recover solids from ground cod frames and to apply ultrafiltration (UF) to the resulting aqueous phase. Early heat treatment (90 o C/20 min) dissolved collagen into aqueous phase resulting in a very low UF flux. A pH adjustment to 4.5 after grinding (≃0.32 cm die), with no heat resulted in efficient separation after centrifuging. UF of the aqueous phase showed an increase in initial flux (23 L/hr m 2 ). However, when the same aqueous material was heated and then centrifuged (1-2% solids removed), UF flux was further increased to 46 L/hr m 2 and this process gave highest solids recovery (90%)
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