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International Journal of Pharmaceutical InvestigationNOW IN
Article

Self-assembled supramolecular hydrogel based on PCL-PEG-PCL triblock copolymer and γ-cyclodextrin inclusion complex for sustained delivery of dexamethasone

Elham Khodaverdi1, Marzieh Gharechahi2, Mona Alibolandi3, Farnaz Sadat Mirzazadeh Tekie4, Bibi Zahra Khashyarmanesh5, Farzin Hadizadeh3,5★★ Corresponding author

  1. 1Targeted Drug Delivery Research Centre Mashhad University of Medical Sciences, Mashhad, IRAN.
  2. 2Department of Pharmaceutics, Mashhad University of Medical Sciences, Mashhad, IRAN.
  3. 3Biotechnology Research Centre and School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, IRAN.
  4. 4Medical Nanotechnology Research Centre, Tehran University of Medical Sciences, Tehran, IRAN.
  5. 5Department of Medicinal Chemistry, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, IRAN.

CORRESPONDENCE

Farzin Hadizadeh

Biotechnology Research Centre and School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, IRAN.

hadizadehf@mums.ac.ir

Volume 6, Issue 2 · pp. 78–85 · PUBLISHED · DOI: 10.4103/2230-973X.177809

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ABSTRACT

In this study, thermosensitive, water-soluble, and biodegradable triblock copolymer PCL600-PEG6000-PCL600 was used to form supramolecular hydrogel (SMGel) by inclusion complexation with γ-cyclodextrin (γ-CD). The prepared SMGel was investigated as a carrier for sustained release of dexamethasone. The triblock copolymer PCL-PEG-PCL [where PCL = polycaprolactone, PEG = poly(ethylene glycol)] was synthesized by the ring-opening polymerization method using microwave irradiation. The polymerization reaction and the copolymer structures were evaluated by nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC). SMGel was prepared in aqueous solution by blending an aqueous γ-CD solution with aqueous solution of PCL-PEG-PCL triblock copolymer at room temperature. The sol-to-gel transition time was measured at various concentrations of copolymer and γ-CD. As-prepared SMGel was used to prepare a sustained, controllable drug delivery system of dexamethasone sodium phosphate. The SMGel was also characterized in terms of rheological, morphological, and structural properties. Results obtained from proton nuclear magnetic resonance (1H-NMR) and GPC demonstrated that microwave irradiation is a simple and reliable method for synthesis of PEG-PCL copolymer. The SMGel with excellent syringability was prepared by mixing of 20% wt γ-CD and 10% wt of copolymer within 4 s. The SMGel containing 10% wt copolymer, 20% wt γ-CD, and 0.5% or 0.1% wt dexamethasone released approximately 100% and 45% of drug over up to 23 days, respectively. It could be concluded that SMGel based on self-assembly of inclusion complexes between PCL-PEG-PCL copolymer and γ-CD could be used as a basis for injectable drug delivery systems that provide sustained and controlled release of macromolecular drugs such as dexamethasone.

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    Khodaverdi, E., Gharechahi, M., Alibolandi, M., Tekie, F. S. M., Khashyarmanesh, B. Z., & Hadizadeh, F. (). Self-assembled supramolecular hydrogel based on PCL-PEG-PCL triblock copolymer and γ-cyclodextrin inclusion complex for sustained delivery of dexamethasone. International Journal of Pharmaceutical Investigation, 6(2), 78–85. https://doi.org/10.4103/2230-973X.177809