Bio-electrical impedance analysis of silk sweet sweet potato tissues under low-temperature storage using a novel indicator, LTO

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 degrees 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 degrees 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. (C) 2021 IAgrE. Published by Elsevier Ltd. All rights reserved.

Automated summary

This study reported specific changes in the electrical impedance properties of sweet potato tissues under low-temperature storage, with LTO used as an indicator to monitor tissue status. The results showed gradual increase in LTO values during storage, with the change kinetics constant increasing linearly with decrease in storage temperature. Additionally, after 20 days, LTO values of samples stored at 0 degrees C had significantly decreased, indicating the applicability of LTO as a tool to rapidly monitor changes in sweet potato tissue status during low temperature storage.