交流高電圧印加電極上で保蔵したホウレンソウの品質に関わる特性変化の検討

抄録

To investigate the effect of electrical treatment on storage behavior for fresh spinach leaves during cold storage, sample leaves with various leaf lengths were put on the AC high voltage electrode and were examined for changes in moisture content, SPAD value as a leaf color index and L-ascorbic acid content during storage. The sample leaves were sorted into sizes S (20-25 cm), M (26-37 cm) and L (38-50 cm) as samples of different shape. Each sample leaf was put on a stainless-steel shelf at 9.4°C in 84.9% RH. One of the shelves received an AC voltage of 2000 V and a frequency of 50 Hz for 8 weeks, and another shelf was electrostatic shielded as a control condition. The moisture content of all samples was significantly decreased after 4 weeks of storage. The moisture content for the voltage applied sample of M size at 2 weeks storage and L size at 4 weeks was statistically lower than the control (P < 0.05), though the SPAD values showed no significant differences for electrical treatment. There was also no significant difference for the L-Ascorbic Acid content in the 2 weeks storage. The result of this study indicated that there should be no effect of electrical treatment using an AC high voltage electrode on the spinach leaf attributes during cold storage for 2 weeks except for moisture content.