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Applying conductivity parameters to assess the degree of barley grain destruction

 

 

 

Key words:

barley grains, destruction, impedance, admittance

Summary

The study aimed to determine the possibility of the application of conductive parameters (impedance and admittance) of barley grains of the Kormoran and Skarb varieties to assess the degree of their mechanical damage. The experimental material included spring barley grains of the Kormoran and Skarb varieties with a moisture content of 14%. Differentiated degrees of grain destruction at levels of 5%, 10%, 15% and 20% were obtained by mixing whole (nondamaged) and mechanically damaged grains in appropriate ratios: 95/5%, 90/10%, 85/15% and 80/20%. Measurements of the electrical parameters (impedance and admittance) of the grains were performed using an LCR meter of the type E4980a, within a range of f = 100 Hz – 100 kHz, and using an RCC electrical substitute model of food products. The results of conductivity measurements for the impedance and admittance of the Kormoran and Skarb variety barley grains and the conducted statistical analyses clearly demonstrated that their values and changes were determined by the variety and the degree of barley grain destruction as well as the measuring frequency and voltage. The obtained mathematical relationships indicate the possibility of the application of admittance or impedance measured within a low-frequency range (100 Hz and 1 and 10 kHz) to determine the degree of barley grain destruction. For practical reasons, measurements of conductivity parameters at f = 100 Hz are recommended to this end. It was found that the obtained study results were a premise for extending the analysis and measurement scope to include other cereal species and varieties.

 

Joanna K. BANACH1, Katarzyna MAJEWSKA2, Ryszard ŻYWICA1

University of Warmia and Mazury in Olsztyn 1Faculty of Economics, Institute of Management and Quality 2Faculty of Food Science, Department of Food Plant Chemistry and Processing

 

 

 

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