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http://dx.doi.org/10.3746/jkfn.2015.44.12.1847

Effect of Supercritical Carbon Dioxide on Physicochemical Properties and Microbial Reduction of Freeze-Dried Bovine Liver  

Kim, Hye-Min (AMICOGEN Ltd.)
Woo, Sung-Woon (AMICOGEN Ltd.)
Kim, Ah-Na (Department of Agricultural Chemistry and Food Science and Technology (Institute of Agriculture and Life Sciences), Gyeongsang National University)
Heo, Ho-Jin (Department of Agricultural Chemistry and Food Science and Technology (Institute of Agriculture and Life Sciences), Gyeongsang National University)
Chun, Ji-Yeon (Department of Food Technology, Sunchon National University)
Choi, Sung-Gil (Department of Agricultural Chemistry and Food Science and Technology (Institute of Agriculture and Life Sciences), Gyeongsang National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.44, no.12, 2015 , pp. 1847-1855 More about this Journal
Abstract
Supercritical carbon dioxide ($SC-CO_2$) treatment has been becoming an important method for substituting the use of organic solvents for samples extraction prior to analysis due to its low toxicity, ease of handling, low cost of disposal etc. Freeze-dried bovine liver was treated with $SC-CO_2$ under different pressures (200, 300, and 450 bar) in order to investigate effects on physicochemical properties and reduction of microbial load. The yield of lipid extraction from bovine liver by $SC-CO_2$ treatment increased with increasing pressure, with values of 84, 86, and 90% in response to 200, 300, and 450 bar, respectively. Results of high performance liquid chromatography analysis showed that vitamin A and coenzyme $Q_{10}$ ($CoQ_{10}$), which is soluble in lipid, were almost removed from bovine liver by $SC-CO_2$ treatment. Saturated fatty acids ratio of bovine liver decreased with increasing pressure, whereas polyunsaturated fatty acids increased with increasing pressure. Total content of amino acids in bovine liver treated by $SC-CO_2$ was less than that of the control sample without treatment. The number of aerobic bacteria in bovine liver, which was stored at $5^{\circ}C$ for 5 days and freeze-dried, decreased from 6.2 to 4.2 log CFU/g by $SC-CO_2$ treatment at 100 bar for 3 h. Interestingly, coliform bacteria were not found in the bovine liver sample by $SC-CO_2$ at 100 bar for 3 h under all storage conditions. This indicates that $SC-CO_2$ treatment can effectively reduce coliform bacteria in the food matrix even at low moisture. In conclusion, freeze-dried bovine liver by proper $SC-CO_2$ treatment may be used as a potential high protein source, with increasing microbial safety and stability of lipid oxidation.
Keywords
supercritical carbon dioxide; physicochemical properties; microbial; reduction; bovine liver powder;
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Times Cited By KSCI : 6  (Citation Analysis)
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