Change of Sprouting-related Enzymes Activities and Food Quality Characteristics of Sweetpotato Root (Ipomea batatas Lam.) by Electron Beam Irradiation
2012
Lim, S.J., Chonbuk National University, Jeonju, Republic of Korea | Song, M.S., Chonbuk National University, Jeonju, Republic of Korea | Lee, G.A., Chonbuk National University, Jeonju, Republic of Korea | Cho, J.Y., Chonbuk National University, Jeonju, Republic of Korea
We investigated that electron beam irradiation is the effective method to control the sprouting of sweetpotato roots without changing of food quality characteristics. In 12 and 25℃ storage after electron beam irradiation, all control samples were sprouted from 6 and 4 weeks after storage, respectively. The sprouting rate of control increased with time and the rate reached to 11.2-12.4 and 70.5-74.2% at 8 weeks after 12 and 25℃ storage. Also, the sprouting of middle and below positioning sweetpotato roots at 12 and 25℃ storage after irradiation reached to 8.6-11.3 and 42.7-48.7% after a storage period of 8 weeks, respectively. However, the sprouting of all sweetpotato roots stored at 4℃ and upper (0-7 cm) positioning samples of box stored at 12 and 25℃ with electron beam was completely inhibited due to increase peroxidase and indole acetic acid (IAA) oxidase activity. Also, all samples with electron beam such as hardness, pH, sugar content, weight loss, and vitamin C and dacarotene content did not differ from that of the control. Therefore, if electron beam will be irradiated to sweetpotato roots above 0.1 kGy before packing, it will effectively inhibit their sprouting stored at 25℃ without the change of food quality characteristics.
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