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Studies on the Mutagenicity, Lipids Peroxidation and Meat Structure of Cooked Pork in Relation to Storage and Reheating using a Microwave Oven  

Chung Kyung-Sook (Dept. of Food & Nutrition, Kyunghee University)
Koo Sung-Ja (Dept. of Food & Nutrition, Kyunghee University)
Publication Information
Korean journal of food and cookery science / v.20, no.6, 2004 , pp. 643-649 More about this Journal
Abstract
Pork was cooked using three kinds of instrument [electric pill (EG) for 5min., microwave oven (MW) for 6min. and reheated using a MW] and then extracted with $80\%$ methanol. The Ames test was performed on the methanol extracts, employing the S. typhimurium tester strain, TA100. The methanol extract of cooked pork showed high mutagenicity ion the 5.0 mg/plate without the S9 mix, but a higher mutagenicity was induced with the S9 mix With increasing refrigeration $(4^{\circ}C)$ and freezing $(-18^{\circ}C)$ periods the extracts showed higher mutagenicities and TBA values, and the same results where shown with reheating. Correlations of the mutagenicity (-S9 mix) and rancidity of the pork cooked by EG, according to storage at and $-18^{\circ}C$ and reheated by MW (1 min), were r=0.85, 0.86, 0.98 and 0.83, respectively. When the MW was used for reheating, the refrigeration storage (r=0.98) showed a higher correlation coefficient than for that stored frozen (r=0.83). From the structure of cooked pork, as observed by SEM, many vapor pathways were viewed in the pork reheated using themicrowave oven.
Keywords
pork; cookery; storage; mutagenicity; rancidity; SEM;
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