In this study, the specific changes in the electrical impedance properties of sweet potato tissues under low-temperature storage are reported. The tissue status was monitored by using an electrical indicator, LTO (which refers to the distance from the origin of the coordinate at the top of the circular arc of the corresponding Cole–Cole plot), and its variation was investigated at storage temperatures of 0, 5, and 13 °C for 20 d. Our results show that the LTO values increased gradually during storage for up to10 d. Moreover, the change kinetics constant increased linearly with decrease in the storage temperature. Furthermore, by 20 d, the LTO values of samples stored at 0 °C had significantly decreased. We speculate that these changes are influenced by changes in the sugar concentration or by the occurrence of chilling injury. These findings indicate that the LTO has applicability as a tool to rapidly monitor changes in the status of sweet potato tissues during low-temperature storage.

在这项研究中，报道了低温保存下甘薯组织电阻抗特性的特定变化。通过使用电子指示器LTO（这是指距相应Cole-Cole曲线的圆弧顶部的坐标原点的距离）来监视组织状态，并在存储温度为0的情况下研究其变化，5和13°C放置20 d。我们的结果表明，在储存长达10 d的过程中，LTO值逐渐增加。而且，变化动力学常数随储存温度的降低而线性增加。此外，到20 d时，在0°C下存储的样品的LTO值已显着降低。我们推测这些变化受到糖浓度变化或冷害的影响。