18C-7 |
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H. Y. CHUNG, Biology Dept., The Chinese Univ. of Hong Kong, Shatin, N.T., Hong Kong, HKG, China, W. C. J. Ma, Biology Dept., The Chinese Univ. of Hong Kong, and J.-S. Kim, Pulmuone R&D Center, Pulmuone Co. Ltd., Seodaemun PO Box 146, Seodaemun-Ku, Seoul, 120-600, South Korea. Bromophenols are a grouped of compounds found only in the marine seafood but not in the freshwater one. They are accumulated in the marine animals and can provide a sea-like aroma to them. Cultivated fishes generally contain low concentrations of bromophenols when compared to the wild ones. In order to increase the bromophenol content and thus improve the flavor quality in the cultivated fishes, fish fed with bromophenol-containing seaweed could be an option. The objective of this investigation was to evaluate the effect of an experimental feed on the bromophenol content of a model fish, green grouper Epinephelus coioides during an 8-wk feeding period. Groupers were divided into 2 groups each containing 30 fishes. Both conventional feed and experimental feed containing 30% dried seaweed were prepared. Six fishes were collected from each group biweekly for 8 wk. Proximate analyses and evaluation of bromophenol contents were carried out. Bromophenols were extracted with pentachloroanisole as the internal standard. Identification and quantification of the components were carried out by a gas chromatography-mass spectrometry. Both moisture and lipid contents were generally higher in the control. But the total weight and protein content were higher in the experimental group. Only 2,4-dibromophenol and 2,4,6-tribromophenol were detected in both control and experimental groups. Throughout the 8 weeks, the concentration of 2,4,6-tribromophenol was higher in the experimental group (9.20 – 32.3 ng/g dry wt.) than in the control (7.33 – 18.79 ng/g dry wt.). However, the observations were different for 2,4-dibromophenol. The total bromophenol content rose to a maximum at wk 4 for the experimental feed whereas at wk 6 for the control. Experimental feed incorporated with bromophenol-containing seaweed was able to increase the total bromophenol content in the model fish.
Session 18C, Food Chemistry: Food composition, analysis and volatiles
2005 IFT Annual Meeting, July 15-20 - New Orleans, Louisiana |