Effect of plant growth regulator on electrical impedance spectroscopy during ripening process in kiwifruits

Plant growth regulators were used frequently to improve the yield of kiwifruits in recent years. But the use of plant growth regulators often caused low internal quality and deformity of fruits, and the expanded kiwifruits easily decay after softening. It is necessary to explore the effect of plant growth regulators on kiwifruit tissue during the ripening process. Up to now, the traditional chemical methods and the other modern techniques such as NIR, FTIR and NMR have been adopted to analyze the influence of plant growth regulators on fruit tissues. But these approaches are difficult to achieve fast and cheap measurement. Electrical impedance spectroscopy (EIS) is a fast developing method in analyzing materials' characterization. When currents with different frequencies flow through the biological tissue, cytomembrane, the extracellular and intracellular fluid would show different electrical properties. Therefore, EIS has the potential to be used for detecting the change of kiwifruit cell microstructure duri