The prospect of electrical impedance spectroscopy as non-destructive evaluation of citrus fruits acidity

Abstract

Abstract — Main objective of the present work was to investigate the Garut citrus fruits acidity using electrical impedance measurements. Furthermore, the measurements of electrical properties of Garut citrus fruits were conducted at various levels of pH and frequencies. This is done as a first step in order to evaluate the Garut citrus fruits acidity that does not damage it. The electrical parameters have significant response to acidity of Garut citrus fruits. The changes of acidity lead to changes in electrical properties of fruits. Resistance per weight, reactance per weight, inductance per weight, and impedance per weight of Garut citrus fuits declined when the pH is increased. While the capacitance per weight of the Garut citrus fruits increases as pH increases. The correlations between pH and electrical parameters are estimated by using multiple regressions equation. Their correlation was highly linear at frequency of 1 MHz. Those estimation equations are the primary basis in nondestructive determining of Garut citrus acidity with electrical impedance measurements.