Effects of low-level gamma irradiation on the characteristics of fermented pork sausage during storage |
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Authors: | IS KimC Jo KH LeeEJ Lee DU AhnSN Kang |
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Institution: | a Department of Animal Resources Technology, Gyeongnam National University of Science and Technology, Gyeongnam 660-758, Republic of Korea b Department of Animal Science and Biotechnology, Chungnam National University, Daejeon 305-764, Republic of Korea c Department of Food Science and Nutrition, Chungju National University, 368-701 Chungj, Republic of Korea d Department of Animal Science, Iowa State University, Ames, IA 50011-3150, USA |
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Abstract: | The effect of gamma irradiation (0.5, 1, 2, and 4 kGy) on the quality of vacuum-packaged dry fermented sausages during refrigerated storage was evaluated. At Day 0 of irradiation, the pH, redness (CIE a?), yellowness (CIE b?), 2-thiobarbituric acid-reactive substances (TBARS) and volatile basic nitrogen (VBN) values of samples irradiated at 2 and 4 kGy were higher (p<0.05), but the CIE L? values (lightness) were lower than those of the non-irradiated control (p<0.05). At<1 kGy irradiation, however, the pH, CIE L?, CIE a? and CIE b?-value of samples were not significantly influenced by irradiation. The CIE a?, and CIE b?-values of samples irradiated at 2 and 4 kGy decreased with the increase of storage time. The VBN, TBARS, and CIE L?-values of samples irradiated at 4 kGy were not changed significantly during refrigerated storage for 90 days (p>0.05). The total plate counts (TPC) and lactic acid bacteria (LAB) in the samples irradiated at 4 kGy were significantly lower (p<0.01) than those with lower irradiation doses. At the end of storage, the TPC, coliform, and LAB in the samples were not increased after irradiation at 1, 0.5 and 1 kGy, respectively. TPC and LAB were not detected in samples irradiated at 4 kGy at Day 90. In addition, no coliform bacteria were found in samples irradiated at 1 kGy during refrigerated storage. Sensory evaluation indicated that the rancid flavor of samples irradiated at 4 kGy was significantly higher, but aroma and taste scores were lower than those of the control at Day 3 of storage. Irradiation of dry fermented sausages at 2 kGy was the best conditions to prolong the shelf-life and decrease the rancid flavor without significant quality deterioration. |
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Keywords: | Fermented sausage Gamma irradiation Storage Lactic acid bacteria Lipid oxidation |
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