KARAKTERISASI GULA FRUKTOSA SEBAGAI PENYUSUN RASA MANIS BUAH MENGGUNAKAN METODE IMPEDANSI LISTRIK

Abstract

Fructose is the most dominant type of monosaccaride sugar as a component of sweetness in fruit, so it is very important in determining the quality of post-harvest fruit represented by the selection of sweetness. The measurement process consist of an electronic transimpedance circuit that is compatible toward the sample with a data acquisition system using PCI 6221 run by LabVIEW. The results of the analysis of output the measurments in the form of voltage (V) and voltage in the current function V(i) show that the nature of the fructose solution is increasingly conductive as the concentration increases with the maximum impedance value is at concentration of 5% is 98055 Ω and minimum at a concentration of 30% is 51432 Ω. The suitable frequency ranges based on measurments are 10 Hz to 1 KHz. The measurement show that the reactance of the fructose is capacitive with the value of the phase difference between voltage and current in the angular range of 351o which means it is in quadrant IV.