Effects of Various Cooking and Re-heating Methods on Cholesterol Oxidation Products of Beef Loin

  • Lee, S.O. (School of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University) ;
  • Lim, D.G. (School of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University) ;
  • Seol, K.H. (School of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University) ;
  • Erwanto, Y. (Department of Animal Products Technology, Faculty of Animal Science, Gadjah Mada University) ;
  • Lee, M. (School of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University)
  • Received : 2005.10.11
  • Accepted : 2006.01.13
  • Published : 2006.05.01


The objective of this study was to define the effects of various cooking and re-heating methods (pan roasting, steaming, oven grilling and micro-waving) on the cholesterol and formation of cholesterol oxidation products in beef loin during storage at $4^{\circ}C$. Raw samples showed lower total cholesterol content than cooked products sampled during storage for 6 d. The following cholesterol oxidation products (COPs) were separated by gas chromatography: $7{\beta}$-hydroxy cholesterol, $20{\alpha}$-hydroxy cholesterol, 25-hydroxy cholesterol, cholestane-$3{\beta}$, $5{\alpha}$, $6{\beta}$ triol (triol), ${\alpha}$-epoxide and 7-ketocholesterol. Total amounts of COPs/cholesterol at 0 d were 0.74, 0.63, 0.76, 1.23 and 0.83% for the raw sample, pan roasting, steaming, oven grilling and micro waving methods, respectively. After 6 d storage almost of the samples had higher content of total COPs than at 0 and 3 d; the lowest (0.55%) COPs was found in the steaming cooking and re-heating method. The highest (5.96%) of COPs was found in the pan roasting cooking and re-heating method after 6 d storage. In conclusion, the concentration of total cholesterol and cholesterol oxidation of beef loin were increased as a consequence of cooking and re-heating methods. Steaming and micro-waving methods showed the lowest of cholesterol oxidation products under refrigerated storage for 6 d. However, each cooking and re-heating method had its own distinctive cooking effects.


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