บทคัดย่องานวิจัย

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Electrical impedance studies of nectarines during coolstorage and fruit ripening.

Harker, F. R.; Dunlop, J.;

Postharvest Biology and Technology Year: 1994 Vol: 4 Issue: 1-2 Pages: 125-134 Ref: 15 ref.

1994

บทคัดย่อ

Electrical impedance studies of nectarines during coolstorage and fruit ripening.

ABSTRACT :

 

The electrical impedance of ripe and unripe nectarine fruits was measured at harvest and after 3 and 8 weeks' storage at 0 deg 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 fruits 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. It is suggested that impedance measureme

nts could be used to study membrane changes in nectarines in relation to the development of mealiness (woolliness) during cold storage.