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. To assess the freshness of various products are often usedmeasuring impedance module. But due to the structure of plant foods diagnosticvalue should have exactly a complex component of impedance. Article tasked withdeveloping criteria for assessing the functional state of the products subjectto a comprehensive component of the impedance. Research methodology. Todetermine the functional status of the fruit were measured module and phase ofimpedance at the three frequencies of 20, 100 and 500 kHz. Criteria forrecognition of functional status determined by the dynamics of changes in theparameters of the complex impedance due to destructive processes caused bydehydration and putrefaction processes. Data processing and analysis. On thebasis of experimental data obtained at three frequencies modeled frequency andphase response and their changes during losing of freshness and appearance ofdestructive processes. Discussion and conclusions. In fresh and stale fruitmodulus and phase of the impedance at low and high frequencies havecharacteristic differences. But this is especially evident on thephase-frequency characteristic, which can be seen that the value of the phasewith the loss of freshness at low frequency decreases and increases at highmore than twice during one week. Therefore, to assess the functional state offresh and stale products we suggest use phase portraits of phase response.

Determination of the functional state of the fruits by parameters of the electric impedance