• Journal of the Korean Society of Food Science and Nutrition
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• v.35 no.8
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• pp.1031-1037
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• 2006

The purpose of this study was to investigate the physicochemical characteristics of gamma irradiated-commercial powdery soup under accelerated storage condition $(60^{\circ}C,\;4\;weeks)$. TBA values increased with increment of irradiation dose, but were not affected by storage period. On the other hand, TBA values increased with increment of storage period in non-irradiated sample. pH of irradiated samples decreased as compared with that of non-irradiated sample and significantly decreased as elapse of storage period (p<0.05). Viscosity of irradiated samples significantly decreased as increment of irradiation dose and no significant difference was abserved as elapse of storage period (p<0.05). In Hunter's value, L value decreased but a value and b value were not significantly different with increment of irradiation dose and elapse of storage period. Because gamma irradiation was led to lipid oxidation and decrease in viscosity of commercial powdery soup, these results suggested that further studies should be investigated to reduce detrimental effects induced by irradiation.

• Journal of the Korean Society of Food Science and Nutrition
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• v.35 no.8
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• pp.1064-1069
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• 2006

This study was conducted to sanitize commercial powdery soup by gamma irradiation. Total aerobic bacteria counts were $3.22{\sim}3.77\;log\;CFU/g$ in non-irradiated samples, which decreased with irradiation dose and were not detected in irradiated samples at 3 kGy or more $(<10^2\;CFU/g)$ during accelerated storage $(60^{\circ}C,\;2\;weeks)$. Microbial counts did not significantly increase in all samples during accelerated storage period. Yeasts, molds, and coliform bacteria were not detected in all samples. Irradiated samples showed undesirable changes in flavor, taste, and overall acceptability and acceptance decreased in all samples after 2 weeks at $60^{\circ}C$. These results suggested that gamma irradiation at 3 kGy was effective to ensure the microbiological quality of commercial powdery soup with minimized sensorial changes, but further studies should be investigated to reduce detrimental effects induced by irradiation.