Recovery of a Useful Component from Waste during Production of Oyster Extract (Crassostrea gigas) and Assessment of Its Availability

Abstract

A taurine-rich fraction (P-III fraction) was prepared from waste during the production of oyster extract and its bioavailability was evaluated. Five-week-old male Wistar rats were divided into 3 groups; HC, T and P-III. The HC group was fed AIN93G diet supplemented with cholesterol (1 %) and sodium cholate (0.25 %). The T and P-III groups were fed the high-cholesterol diet supplemented with taurine (0.5 %) or P-III dry powder, respectively. Dietary taurine levels in the P-III group were equal to those in the T group. After feeding for 16 days, taurine concentrations in the liver, muscles, eyes and blood of rats in the T and P-III groups were significantly higher than those in HC group. Total cholesterol levels in the liver and serum of the T and P-III groups were significantly lower than those in the HC group. These findings indicate that oyster taurine was recovered in P-III as an available form. In addition, we could obtain crystalline taurine from the P-III fraction.