Összes szerző

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Gillay Bíborka

az alábbi absztraktok szerzői között szerepel:

Vozáry Eszter
Effect of Weight Loss on the Electrical Impedance Parameters of Lettuce and Iceberg Lettuce Stored at Room Temperature

Aug 30 - szerda

15:30 – 17:00

II. Poszterszekció

P34

Effect of Weight Loss on the Electrical Impedance Parameters of Lettuce and Iceberg Lettuce Stored at Room Temperature

Eszter Vozáry, Bíborka Gillay

Hungarian University of Agriculture and Life Science, Institute of Food Science and Technology

Department of Food Industrial Measurements and Control

We bought the lettuce and iceberg lettuce at the local market. The leaves were stored at room temperature. The weight loss of the leaves was measured with a scale. The electrical impedance spectra were determined with HP4284A and 4285A precision LCR meters in the frequency range of 30 Hz to 30 MHz. At a measuring voltage of 1 V, the magnitude and phase angle of the electrical impedance were measured. The measured spectra were corrected with the stray inductance and capacitance values. A homemade needle electrode and ECG electrodes were used for the measurement. The initial moisture content of the leaves was determined from samples dried to constant weight in an oven at 110°C. Both the impedance measurement and the weight measurement were performed at room temperature for each leaf for 10 minutes over 4-5 hours until the leaf completely withered. The measured impedance spectra were approximated with three distributed elements connected in series. We determined the resistance and capacity of the elements of the model circuit, as well as the relaxation time. The change in the obtained parameters followed well the weight loss, i.e. the change in the water content of the leaf.