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http://dx.doi.org/10.3746/jkfn.2006.35.1.104

Effect of Gamma Irradiation on the Softening of Dried Fernbrake at Different Moist-Heating Conditions  

Seung, Tae-Hwa (Dept. of Food & Nutrition, Chungnam National University)
Lee, Ju-Woon (Team for Radiation Food Science and Biotechnology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Byun, Myung-Woo (Team for Radiation Food Science and Biotechnology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Kim, Mee-Ree (Dept. of Food & Nutrition, Chungnam National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.35, no.1, 2006 , pp. 104-108 More about this Journal
Abstract
Effect of gamma irradiation on the softening of dried fernbrake at different moist-heating conditions was investigated. Dried fernbrake packaged in controlled atmosphere $(CO_2\;25\%,\;N_2\;75\%)$ was irradiated up to 7 kGy with $\gamma-ray$. Hardness of dried fernbrake was significantly decreased at the irradiation dose of above 5 kGy. Hardness of cooked fernbrake was significantly decreased with increasing irradiation dose level as well as heating temperature and time. $DT_{50}$ value (The heating time required to reach the $50\%$ reduction of hardness) for irradiated fernbrake was shortened according to dose level as well as heating temperature and heating time: $DT_{50}$ value of control: 23 min, 5 or 7 kGy: $2.2\~5.0$ min at $60^{\circ}C$. Also, the activation energy for softening of irradiated fernbrake ($1.85\~1.88$ kcal/mole for $5\~7kGy$) decreased compared to control (4.30 kcal/mole). Moisture content, swelling and rehydration rate of gamma irradiated fernbrake during moist heating increased according to the irradiation doses. Sensory results showed that scores of off-flavor and odor in irradiated fernbrake upto 7 kGy were not significantly different from control. Based on these results, gamma irradiation was effective for the reduction of cooking time and the activation energy for softening of dried fernbrake with increasing dose levels.
Keywords
dried fernbrake; gamma irradiation; moist-heating; softening;
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