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Calorimetric study of the interactions between surfactants and dextran modified with deoxycholic acid

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Abstract

Dextran modified with deoxycholic acid (Dex-DCA) was synthesized by grafting DCA along the polymer backbone, with degrees of substitution (DS)—2% and 3%. The thermodynamics of the association processes of the mixed systems is followed by isothermal titration calorimetry for sodium deoxycholate/sodium dodecyl sulfate (NaDCA/NaDS), Dex-DCA with different surfactants—Dex-DCA/NaDS, Dex-DCA/NaDCA, and Dex-DCA/DTAB (dodecyltrimethylammonium bromide). Calorimetric measurements for the micellization processes of the pure surfactants in aqueous solution were also performed for comparison with the results obtained for the mixed systems. We have obtained and herein present the enthalpies of micelle formation and critical micelle concentrations for the referred pure surfactants, as well as the interaction and aggregation enthalpies for the mixed systems-surfactant/polymer. The dependence of the observed aggregation behavior on the surfactant and temperature is discussed in detail. Finally, we should stress that calorimetry allowed us to ascertain a very important fact in polymer/surfactant interaction. From the comparison between NaDCA/NaDS and Dex-DCA/NaDS calorimetric titration curves, we could clearly see that the interaction between Dex-DCA and NaDS is driven by the interaction between the bile acid moiety and the surfactant.

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Acknowledgements

Thanks are due to FCT for financial support to CIQ(UP), Unidade de Investigação 81, and for a Post-Doc grant to G.B (SFRH/BPD/41407/2007).

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Authors and Affiliations

  1. CIQ (UP), Department of Chemistry, Faculty of Sciences, University of Porto, R. Campo Alegre, 687, 4169-007, Porto, Portugal

    Guangyue Bai, Vasco Castro & Margarida Bastos

  2. “Petru Poni” Institute of Macromolecular Chemistry, 700487, Iasi, Romania

    Marieta Nichifor

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  1. Guangyue Bai
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  2. Vasco Castro
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  4. Margarida Bastos
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Correspondence to Margarida Bastos.

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Bai, G., Castro, V., Nichifor, M. et al. Calorimetric study of the interactions between surfactants and dextran modified with deoxycholic acid. J Therm Anal Calorim 100, 413–422 (2010). https://doi.org/10.1007/s10973-009-0656-5

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  • DOI: https://doi.org/10.1007/s10973-009-0656-5

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