Comparisons of Chemical and Physical Properties of Catfish Oils Prepared from Different Extracting Processes

Abstract

Four different catfish oil extraction processes were used to extract oil from catfish viscera: process CF1 involved a mixture of ground catfish viscera and water, no heat treatment, and centrifugation; process CF2 involved ground catfish viscera (no added water), heat treatment, and centrifugation; process CF3 involved a mixture of ground catfish viscera and water, heat treatment, and centrifugation; process CF4 involved ground catfish viscera, enzymatic hydrolysis, and centrifugation. Chemical and physical properties of the resulting of catfish oils were evaluated. The CF4 process recovered significantly higher amounts of crude oil from catfish viscera than the other 3 extraction methods. The CF4 oil contained a higher percent of free fatty acid and peroxide values than CF1, CF2, and CF3 oils. Oleic acid in catfish oil was the predominant fatty acid accounting for about 50% of total fatty acids. Weight loss of oils increased with increasing temperatures between 250 and 500 degrees C. All the catfish oil samples melted around -32 degrees C regardless of the extraction methods. The flow behavior index of all the oil samples was less than 1, which indicated that the catfish oils exhibited non-Newtonian fluid behavior. The apparent viscosity at -5 and 0 degrees C was significantly higher (P < 0.05) than those at 5, 10, 15, 20, 25, and 30 degrees C. The average magnitude of activation energy for apparent viscosity of the oil was higher for CF2 than CF1, CF3, and CF4.

Lipids from visceral depot fat of Asian seabass (Lates calcarifer): Compositions and storage stability as affected by extraction methods

“…Lipids from all extraction methods had oleic acid (C18:1(n‐9)) as the most abundant fatty acid (25.34–27.18 g/100 g lipid), followed by palmitic acid (C16:0) (20.08–21.80 g/100 g lipid), and linoleic acid (C18:2(n‐6)) (12.86–15.19 g/100 g lipid). The result was in accordance with Sathivel et al who reported that oleic acid was the predominant fatty acid in lipids from catfish viscera. Oleic acid was also found as a major fatty acid in visceral lipids of carp and steelhead trout .…”

“…Among all samples, those extracted by heating under vacuum showed the highest yield (67.33%) (p < 0.05), followed by those extracted using solvent (64.26%), autoclave (59.12%), and heating in air (54.97%), respectively. The yield of lipids obtained in the present study was higher than those of lipids extracted from viscera of catfish (5.9-14.3%) found by Sathivel et al [7], selected Indian fresh water fish (4.0-12.4%) [16], pollock (14.32%) [17], and steelhead trout (40.2%) [1]. This was more likely due to the higher proportion of lipid/oil in the depot fat, in comparison to that of the whole viscera.…”

Biodiesel production from waste salmon oil: kinetic modeling, properties of methyl esters, and economic feasibility of a low capacity plant

“…Measured values were 5.94 and 16.12 meq/kg for oil and methyl esters, respectively. Shativel et al studied the influence of extraction methods on fish oil properties . Samples obtained by methods that involved heating the oil showed higher peroxide values.…”

Agglutination of Intravenously Administered Phosphatidylcholine‐Containing Lipid Emulsions With Serum C‐reactive Protein

“…23 Fish oil contains approximately 1.4 g/kg. 24 Soybean oil (the only oil present in the soybean oil-based fat emulsion and a major compound in the structured oil-based fat emulsion) is characterized by a high phospholipid content (total phospholipid content: 11.2 ± 12.6 g/ kg, of which ±27% is phosphatidylcholine). 25 The differences in chemical and physical properties of the fat emulsions might explain the observed differences.…”