Correlation between dielectric properties and freshness of leaf vegetables

The correlation between the dielectric properties and the freshness of leafy vegetables was studied to evaluate the quality nondestructively. The dielectric properties were studied on four kinds of leaf vegetables with two plate electrodes during storage at room temperature. The results show that the dielectric constants and parameters for freshness decreased during 3-day storage of leaf vegetables. A significant correlation between the dielectric properties and freshness of four vegetables was observed. It is possible to evaluate the quality of vegetables nondestructively by determination of dielectric properties.