RESULTS AND DISCUSSIONThe nutritional properties of raw and dried tilapia fishare presented in Table 1. Each value is the mean±standarddeviation of triplicate determinations. Raw samplespresented low protein, lipids, vitamin A, potassium and phosphorus; intermediate energy value; high moisture and ash contents, similar findings reported by Eyo [11,13]. Decrease of moisture and increase of protein, lipids,vitamin A, potassium and phosphorus contents were the most prominent changes in tilapia fish after drying. Moisture, protein, lipids and vitamin A contents increased significantly in processed samples (P<0.05). This trend is in agreement with those obtained by Tao and Linchun [9]. The significant increase in protein levels (P<0.05) in dried tilapia fish, when compared with the raw fish, suggests that protein nitrogen was not lost during drying. This is in accordance with the findings of Puwastien et al. [6],Gokoglu et al. [8] and Tao and Linchun [9]. However there was no significant difference between smoking kiln drying and electric oven drying for protein, ash, fibre, carbohydrate, potassium and phosphorus contents.After drying, there was a significant increase in lipids content. Smoking kiln-dried samples retained higher lipids content than electric oven-dried samples (P<0.05). This result indicates that the fat loss phenomenon was more intensive in the electric oven-dried fish than in smoking kiln-dried samples. Fat may exude with the moisture evaporation during electric oven drying and that seems to enhance the phenomenon of lipids loss.
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