AAPS PharmSciTech

, Volume 18, Issue 6, pp 2102–2109 | Cite as

In Vitro and Ex Vivo Evaluation of Novel Curcumin-Loaded Excipient for Buccal Delivery

  • Flavia LaffleurEmail author
  • Franziska Schmelzle
  • Ariane Ganner
  • Stefan Vanicek
Research Article


This study aimed to develop a mucoadhesive polymeric excipient comprising curcumin for buccal delivery. Curcumin encompasses broad range of benefits such as antioxidant, anti-inflammatory, and chemotherapeutic activity. Hyaluronic acid (HA) as polymeric excipient was modified by immobilization of thiol bearing ligands. L-Cysteine (SH) ethyl ester was covalently attached via amide bond formation between cysteine and the carboxylic moiety of hyaluronic acid. Succeeded synthesis was proved by H-NMR and IR spectra. The obtained thiolated polymer hyaluronic acid ethyl ester (HA-SH) was evaluated in terms of stability, safety, mucoadhesiveness, drug release, and permeation-enhancing properties. HA-SH showed 2.75-fold higher swelling capacity over time in comparison to unmodified polymer. Furthermore, mucoadhesion increased 3.4-fold in case of HA-SH and drug release was increased 1.6-fold versus HA control, respectively. Curcumin-loaded HA-SH exhibits a 4.4-fold higher permeation compared with respective HA. Taking these outcomes in consideration, novel curcumin-loaded excipient, namely thiolated hyaluronic acid ethyl ester appears as promising tool for pharyngeal diseases.


buccal curcumin hyaluronic acid thiomer wound healing 



The authors thank Josef Mayr in Mayr, Natters, Austria for the porcine mucosa.

Compliance with Ethical Standards

Declaration of Interest

The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript. This includes employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending, or royalties. No writing assistance was utilized in the production of this manuscript.


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Copyright information

© American Association of Pharmaceutical Scientists 2016

Authors and Affiliations

  • Flavia Laffleur
    • 1
    Email author
  • Franziska Schmelzle
    • 1
  • Ariane Ganner
    • 1
  • Stefan Vanicek
    • 2
  1. 1.Department of Pharmaceutical Technology, Institute of Pharmacy, Center for Molecular Biosciences InnsbruckUniversity of InnsbruckInnsbruckAustria
  2. 2.Institute for Inorganic and Theoretical Chemistry, Center for Molecular Biosciences InnsbruckUniversity of InnsbruckInnsbruckAustria

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