Abstract
The electrical impedance of ripe and unripe nectarine fruit was measured at harvest and after 3 and 8 weeks storage at 0°C, using frequencies of alternating current between 50 Hz and 0.1 MHz. The complex impedance was separated into its resistive and reactive components for both the electrodes and the fruit flesh. Electrode impedance was higher in stainless steel than in silver electrodes, and stainless steel electrodes were influenced by changes in ionic conditions. The resistance of whole fruit was lower than that of excised blocks of tissue from the same fruit. Changes in tissue resistance were greatest at low frequencies (50–100 Hz), with resistance increasing between 0 and 3 weeks storage and decreasing between 3 and 8 weeks storage. Changes in electrical resistance of nectarines are discussed, with the assumption that low frequency current travels via an extracellular pathway, and high frequency current travels via an intracellular pathway.
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