4.6 Article

Amorphous solid dispersions in poly(ε-caprolactone)/xanthohumol bioactive blends: physicochemical and mechanical characterization

Journal

JOURNAL OF MATERIALS CHEMISTRY B
Volume 9, Issue 20, Pages 4219-4229

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tb02964e

Keywords

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Funding

  1. Spanish Ministry of Science and Innovation MICINN [PID2019-106236GB-I00]
  2. Basque Government Department of Education, Culture and Language Policy [IT-927-16]
  3. ERDF
  4. ESF

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This paper demonstrates the successful dispersion of xanthohumol (XH) in PCL in amorphous form, with positive interactions observed between the two components. The use of PCL as a matrix allows for the development of completely amorphous bioactive materials suitable for non-stiff biomedical devices, with high toughness retention up to 50 wt% XH content. The miscibility and specific interactions between XH and PCL were confirmed through DSC, XRD, FTIR, and AFM analyses.
This paper reports the obtention of amorphous solid dispersions (ASDs) of xanthohumol (XH) in PCL containing up to 50 wt% of the bioactive compound in the amorphous form thanks to the advantageous specific interactions established in this system. The miscibility of the PCL/XH blends was investigated using DSC. Melting point depression analysis yielded a negative interaction parameter indicating the occurrence of favorable inter-association interactions. XRD analyses performed at room temperature agree with the crystallinity results obtained on the heating runs performed by DSC. FTIR spectroscopy reveals strong C=O center dot center dot center dot O-H specific interactions between the hydroxyl groups of XH and the carbonyl groups of PCL. The AFM analysis of the blends obtained by spin-coating shows the variation of crystalline morphology with composition. Finally, tensile tests reveal high toughness retention for the blends in which XH can be dispersed in the amorphous form (containing up to 50 wt% XH). In summary, PCL is a convenient matrix to disperse XH in the amorphous form, bringing the possibility of obtaining completely amorphous bioactive materials suitable for the development of non-stiff biomedical devices.

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