Abstract
Three different catfish oil extraction processes were used to extract oil from catfish viscera: process P1 involved a mixture of ground catfish viscera and water, no heat treatment and centrifugation; process P2 involved ground catfish viscera (no added water), heat treatment and centrifugation; process P3 involved a mix true of ground catfish viscera and water, heat treatment and centrifugation. Chemical and physical properties of the resulting of catfish oils were evaluated. The P3 process recovered significantly higher amounts of crude oil from catfish viscera than the other extraction methods. The P3 oil also contained a higher percent of free fatty acid and peroxide values than P1and P2 oils. Oleic acid in catfish oil was the predominant fatty acid accounting for about 50% of total fatty acids. The apparent viscosity at-5 and 0 C was significantly higher (P < 0.05) than those at 5, 10, 15, 20, and 30 C.
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