Comparisons of Chemical and Physical Properties of Catfish Oils Prepared from Different Extracting Processes
- 16 March 2009
- journal article
- Published by Wiley in Journal of Food Science
- Vol. 74 (2), E70-E76
- https://doi.org/10.1111/j.1750-3841.2009.01050.x
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.Keywords
This publication has 19 references indexed in Scilit:
- Thermal properties and applications of the Arrhenius equation for evaluating viscosity and oxidation rates of unrefined pollock oilJournal of Food Engineering, 2008
- Differential scanning calorimetric analysis of palm oil, palm oil based products and coconut oil: effects of scanning rate variationFood Chemistry, 2002
- The effects of desiccation on seeds of Acer saccharinum and Aesculus pavia: recalcitrance in temperate tree seedsTrees, 2001
- Thermal analysis in quality assessment of rapeseed oilsThermochimica Acta, 1998
- Effects of fish oil alone and combined with long chain (n-6) fatty acids on some coronary risk factors in male subjectsThe Journal of Nutritional Biochemistry, 1998
- Substitution of soybean meal and oil for fish meal in practical diets fed to channel catfish, Ictalurus punctatus (Rafinesque): effects on body compositionAquaculture Research, 1995
- Quality of Fish Protein Hydrolysates from Herring (Clupea harengus)Journal of Food Science, 1994
- Homoiohydrous (recalcitrant) seeds: Developmental status, desiccation sensitivity and the state of water in axes of Landolphia kirkii DyerPlanta, 1992
- The Inverse Relation between Fish Consumption and 20-Year Mortality from Coronary Heart DiseaseNew England Journal of Medicine, 1985