Physicochemical properties and fatty acid profile of eel (Monopterus albus), catfish (Clarias gariepinus), snakehead fish (Channa striata) essences

Abstract

This study was carried to investigate the physicochemical properties of fish extracted from (swamp eel, catfish and snakehead) and to study their fatty acid composition. The fish essences were extracted by using aqueous extraction method where water was added depend on weighed of fish flesh at ratio 1:1 to· get the 50% (w/v) concentration of essences. The evaluations of fatty acid composition were done by using GC method and were identified by using retention time. The physicochemical of fish essences were determine by several analysis ( color, viscosity, total soluble solid, pH and proximate composition). The results indicated that the swamp eel essence was significantly different (L*=65.53, a*= -7.65, b*=22.82) with catfish (L*=51.14, a*= 2.33, b*= 6.56) and snakehead essences (L*=42.88, a*= -1.18, b*=5.78). Swamp eel

essence recorded the maximum viscosity (2.73 Cp), high total soluble solid (l.8 Brix) and lowest pH (5.89). Meanwhile catfish showed the viscosity (1.73), lowest total soluble solid (l.6 ° Brix) and pH (7.14). Snakehead essence showed the lowest value of viscosity (0.7 Cp), highest total soluble solid (1.87 ° Brix) and pH (7.29). The proximate composition of swamp eel essence were: moisture content 97 .16%, crude protein 1.97%, ash 0.89% and crude fat 4.01 % while catfish essence has moisture content 96.83%, crude protein 1.32%, ash 0.78% and crude fat 1.47%. Meanwhile a snakehead essence has moisture content 95.53%, crude protein 2.59%, ash 0.93% and crude fat 5.14%. Catfish and snakehead essence contained high amount of SFA compared to UFA. Meanwhile swamp eel essence contained high amount of UFA than SFA. Palmitoleic acid was the highest UFAcontained (40.363) in swamp eel. Stearic acid was the major component of FA in catfish essences (55.26) while heptadecanoic acid was the major component in snakehead essence. Due to this study, swamp eel essence was the most acceptable compared to others.