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Erschienen in: Colloid and Polymer Science 4/2014

01.04.2014 | Original Contribution

Inclusion complexes of rosmarinic acid and cyclodextrins: stoichiometry, association constants, and antioxidant potential

verfasst von: Bruno Medronho, Artur J. M. Valente, Patrícia Costa, Anabela Romano

Erschienen in: Colloid and Polymer Science | Ausgabe 4/2014

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Abstract

The interaction between β-cyclodextrin (β-CD) and the polyphenol rosmarinic acid (RA) is here reported by 1H NMR titration experiments. The formation of an aqueous soluble inclusion complex is confirmed and valuable information regarding mode of penetration of guest into β-CD, stoichiometry, and stability of the complex is obtained. The analysis by the continuous variation method shows the undoubted formation of 1:1 β-CD/RA complex. Additionally, the estimated apparent association constants reveal the importance of the asymmetry of the RA in the complexation; the incorporation of the catechol moiety closer to the carboxylic group is more favorable (K = 2,028 M−1) than from the other end of the RA molecule (K = 1,184 M−1). Finally, we have also investigated the antioxidant activity and storage stability of the β-CD/RA complexed system; the presence of β-CD was found to produce a remarkable enhancement on the antioxidant activity.

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Metadaten
Titel
Inclusion complexes of rosmarinic acid and cyclodextrins: stoichiometry, association constants, and antioxidant potential
verfasst von
Bruno Medronho
Artur J. M. Valente
Patrícia Costa
Anabela Romano
Publikationsdatum
01.04.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
Colloid and Polymer Science / Ausgabe 4/2014
Print ISSN: 0303-402X
Elektronische ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-013-3124-5

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