LAUSR

BACKGROUND As a non-destructive testing technology, electrochemical impedance spectroscopy (EIS) has been applied to evaluate food quality because of its rapid, low-cost, non-destructive and portability. However, fish freshness evaluation based on existing EIS technology is affected by the difference of biological individual. In this study, the difference of electrical property between the two orthogonal directions was extracted to develop a new freshness indicator. A real part orthogonal direction difference parameter set (RODDS) was used to establish a prediction model for total volatile base-Nitrogen (TVB-N). RESULTS Compared with the traditional parameter of EIS, coefficient of determination between RODDS and TVB-N increased from 0.55 to 0.71 for calibration group, and root mean squared error (RMSE) between predicted and measured values of TVB-N decreased from 5.46 to 3.81 for test group. CONCLUSION The results implied that RODDS could effectively offset individual difference in basic electrical property and improve the TVB-N prediction accuracy in practical application scenario with samples from multiple origins. The proposed method may provide a new idea for the development and improvement of EIS-based portable testing device for fish and meat. This article is protected by copyright. All rights reserved.