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Szyplowska, A.
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booksection
The Effect of Storage Time on Dielectric Properties of Pasteurized Milks and Yoghurt
Abstract
The aim of the study was to investigate the effect of storagetimeoncomplexdielectricpermittivityofopenedmilkwithdifferentfatcontentandofanaturalyoghurt.Themeasurementswereconductedusingavectornetworkanalyzerandanopen-endedcoaxial-lineprobeinthefrequencyrangefrom 200 MHz to 20 GHz at 9±0.5°C. The results showed that the realpartofdielectricpermittivityofthetestedproductsdecreasedwithanincreaseoffrequency,whiletheimaginarypartofdielectricpermittivityincreasedbelow14.3GHzforyoghurtand13.6GHzformilksanddecreasedabovethosefrequencies.Duringstoragetherealpartofdielectricpermittivity of yoghurt and milks slightly decreased. The value of theimaginarypartofdielectricpermittivityvariedmuchmorefor milks during time storage. The changes of the imaginary part ofdielectricpermittivityofthetestedproductswereassociatedwiththechangesofpHvalue.Finally,complexdielectricpermittivity spectra of the measured products were modeled with thetwo-poleandthree-poleDebyemodel.Three-poleDebyefunction was better fitting to the results.