NUKLEONIKA 2010, 55(1):73-78

 


POSITRON ANNIHILATION LIFETIME SPECTROSCOPY STUDY
OF THERMAL PROCESSING AND REHYDRATION OF DRY LEAK
(Allium porrum L.)



Radosław Zaleski1, Jan Wawryszczuk1, Katarzyna Sobczak2

1 Institute of Physics, Maria Curie-Skłodowska University,
1 M. Curie-Skłodowskiej Sq., 20-031 Lublin, Poland

2 Institute of Landscape Architecture, Faculty of Mathematics and Natural Sciences,
The John Paul II Catholic University of Lublin,
1 H. Konstantynów Str., 20-708 Lublin, Poland



New application of positron annihilation lifetime spectroscopy (PALS) to development of food processing techniques is tested. Dehydrated leeks were an object of the study. Three experiments were performed consisting of evacuating air and volatile compounds from the sample, applying thermal treatment and rehydrating the sample. Distinct changes in positron lifetime spectra allowed the monitoring of alterations in the sample structure. The most likely origin of the particular components present in the spectra was able to be proposed from these data. Changes of the components were ascribed to the various processes occurring in the samples.


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