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22 results on '"Gordo, P.M."'

19. Positronium Trapping in Porous Solids: Means and Limitations for Structural Studies

Author

Kajcsos, Zs., primary, Liszkay, L., additional, Duplâtre, G., additional, Varga, L., additional, Lohonyai, L., additional, Pászti, F., additional, Szilágyi, E., additional, Lázár, K., additional, Kótai, E., additional, Pál-Borbély, G., additional, Beyer, H.K., additional, Caullet, P., additional, Patarin, J., additional, Azenha, M.E., additional, Gordo, P.M., additional, Lopes Gil, C., additional, de Lima, A.P., additional, and Ferreira Marques, M.F., additional

Published
2005
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22. Encapsulation of Natural Flavors in Cyclodextrins: Free Volume Studies by PALS

Author

Ferreira Marques, Maria Fatima, Gordo, P.M., Santos, S.D., Marques, R.F., da Silva, A. Moreira, and Kajcsos, Z.

Abstract

Positron annihilation lifetime spectroscopy (PALS) is used to study the free-volume in β-cyclodextrin (CD) with the encapsulation of two different essential oils: garlic (Allium sativum) and marjoram (Origanum majorana). The data reveal the presence of a long lifetime component related to the o-Ps. It is observed that the addition of garlic (or marjoram) oil to β-CD results in a decrease of the o-Ps lifetime which was ascribed to a reduction of the free volume holes from 83.6 to 67.7 Å3 (79.1 to 72.6 Å3). Different mechanisms for the encapsulation of garlic and marjoram oils in β-CD are suggested by the PALS parameters.

Published
2013
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