DIELECTRIC PROPERTIES OF POTATO PUREE IN MICROWAVE FREQUENCY RANGE AS INFLUENCED BY CONCENTRATION AND TEMPERATURE

Date

2009-01-01

Author

Ahmed, Jasim
Seyhun, Nadide
Ramaswamy, Hosahalli S.
Luciano, Giorgio

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Dielectric properties of potato flour-water dispersions (slurry) were measured in the frequency range of 500-2500 MHz by the open-ended coaxial probe method using a network analyzer as a function of concentration (10-25% w/w) and temperature (20-75 degrees C). Both commercial and laboratory prepared samples of potato flours were used. Results indicated that the dielectric constant (') decreased with temperature and frequency while increased with concentration. The loss factor ('') increased with frequency and concentration; however, temperature showed mixed effect. Both ' and '' data in conventionally used microwave frequencies (915 and 2450 MHz) were studied as function of concentration and temperature for two sample types using a response surface methodology and found to follow 2(nd) order polynomial models. Temperature and concentration contributed significantly on dielectric spectra of potato slurry and the sample source had some effect. A change in ' and '' above 70 degrees C could be attributed by starch gelatinization. Penetration depth (D(p)) decreased with an increase in frequency and non-systematic with temperature. Addition of salt substantially reduced D(p) of potato slurry.

Subject Keywords

Potato, Dielectric constant, Loss factor, Starch gelatinization, Concentration, Penetration depth

URI

https://hdl.handle.net/11511/67473

Journal

INTERNATIONAL JOURNAL OF FOOD PROPERTIES

DOI

https://doi.org/10.1080/10942910802105460

Collections

Department of Food Engineering, Article

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Citation Formats

J. Ahmed, N. Seyhun, H. S. Ramaswamy, and G. Luciano, “DIELECTRIC PROPERTIES OF POTATO PUREE IN MICROWAVE FREQUENCY RANGE AS INFLUENCED BY CONCENTRATION AND TEMPERATURE,” INTERNATIONAL JOURNAL OF FOOD PROPERTIES, pp. 896–909, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67473.