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48 .   Water content of fatty acid/cyclodextrin nanoparticles

Authors: Nicoleta G. Hădărugă, Daniel I. Hădărugă, Georg Merkh, Heinz-Dieter Isengard

Volume 16, Issue 2;
Pages: 230-235;
ISSN:1453-1399, Agroprint;
ISSN (online):2068 – 9551



Abstract:

This paper presents the evaluation of water content of fatty acid/cyclodextrin complexes by classical Karl Fischer titration; the two-component technique on a Karl Fischer 841 Titrando apparatus (Metrohm) was used. The total water concentration was in the range of 7.2-7.5% for the β-cyclodextrin complexes, and little bit higher in the case of α-cyclodextrin complex (7.8%), but for β-cyclodextrin complexes two types of water molecules could be evaluated: “surface” water, which is extracted and react with a higher rate, and “strong-bonded” water molecules, which is extracted and react with a lower rate in the titration process. These results are in good agreement with the thermogravimetric analysis.

Keywords: fatty acid/cyclodextrin complexes, nanoparticles, Karl Fischer water titration, thermogravimetry

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