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<p>In this study, a methodological framework is presented for using electrical impedance spectroscopy to develop a fractional impedance model for three dragon fruit species: <i>Hylocereus undatus</i>, <i>Hylocereus megalanthus</i>, and <i>Hylocereus costaricensis.</i> Electrical impedance spectroscopy tests were conducted on the fruit, sliced in half, using an LCR meter to develop the Randles fractional circuit model across the frequency range of 1 to 1000&#xa0;kHz. The impedance of the evaluated species decreases with increasing frequency, reaching a maximum of 11 kΩ. The Fractional model, based on the Randles model, incorporates resistive and capacitive elements to assess internal properties. The parameters of the equivalent circuit were obtained for two electric spectroscopy setups, where significant effects were observed in the parallel resistance and the model’s capacitor. The observed alpha values for the fractional models ranged from 0.75 to 0.78, indicating characteristic dispersive behavior. Besides, Cole-Cole diagrams were generated from the measurements, and in the fractional models, these diagrams displayed changes in magnitude between the different species and ripening stages. Finally, the electrical behavior varied among the samples due to structural differences, suggesting that impedance spectroscopy could serve as a complementary method for assessing fruit quality.</p>

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Fractional electrical impedance of dragon fruit based on electrical spectroscopy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月13日

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  • Raúl Quechol-Elias,
  • Richard Torrealba-Meléndez,
  • María Elena Sosa-Morales,
  • Roberto Carlos Ambrosio-Lazaro,
  • Jesús Manuel Muñoz-Pacheco,
  • Edna Iliana Tamariz-Flores

摘要

In this study, a methodological framework is presented for using electrical impedance spectroscopy to develop a fractional impedance model for three dragon fruit species: Hylocereus undatus, Hylocereus megalanthus, and Hylocereus costaricensis. Electrical impedance spectroscopy tests were conducted on the fruit, sliced in half, using an LCR meter to develop the Randles fractional circuit model across the frequency range of 1 to 1000 kHz. The impedance of the evaluated species decreases with increasing frequency, reaching a maximum of 11 kΩ. The Fractional model, based on the Randles model, incorporates resistive and capacitive elements to assess internal properties. The parameters of the equivalent circuit were obtained for two electric spectroscopy setups, where significant effects were observed in the parallel resistance and the model’s capacitor. The observed alpha values for the fractional models ranged from 0.75 to 0.78, indicating characteristic dispersive behavior. Besides, Cole-Cole diagrams were generated from the measurements, and in the fractional models, these diagrams displayed changes in magnitude between the different species and ripening stages. Finally, the electrical behavior varied among the samples due to structural differences, suggesting that impedance spectroscopy could serve as a complementary method for assessing fruit quality.