Electrical Behavior of Garut Citrus Fruits During Ripening Changes in Resistance and Capacitance Models of Internal Fruits
I W. Budiastra
K. B. Seminar
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The electrical behavior of Garut citrus fruits have been studied using impedance measurement at various levels of acidity, firmness, and frequencies. This research has been done as a step in order to study the internal citrus properties that do not damage it. So, the aim of the present study was to investigate the behavior of electrical properties and modeling of citrus fruits including internal resistance and its capacitance changes using nondestructive test. Electrical circuit models have been constructed using series and parallel configurations adopted from literature. The new model has been constructed on the based of the internal structure of citrus fruits. In the specific parameters of the resistor and capacitor which describes the internal condition of fruit, the results of simulations have high compatibility and the best deterministic coefficient is the new model. Profile graphs of electrical modeling results have shown the same form with the experimental results. Electrical conductance of intact citrus Garut increased exponentially while the impedance and capacitance decreases exponentially when the frequency is increased. The acidity and firmness changes lead to changes in internal electrical properties of Garut citrus fruits. Based on the new model, membrane capacitance and tissue resistance also can describe the acidity and firmness phenomenon of fruits. The resistances of part component of circuit model were declined as pH increases. While, both of capacitance and pH have positive correlations. In the firmness phenomenon, both of firmness and resistance have a line change, where increasing firmness, it also increases the value of resistance. But it not happens in capacitance behavior as firmness change. The capacitances were decreased as firmness improved.