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Complexation of Oxethazaine With 2-hydroxypropyl-β-cyclodextrin: Increased Drug Solubility, Decreased Cytotoxicity and Analgesia at Inflamed Tissues

Complexation of Oxethazaine With 2-hydroxypropyl-β-cyclodextrin: Increased Drug Solubility, Decreased Cytotoxicity and Analgesia at Inflamed Tissues

Andressa R Prado, Fabiano Yokaichiya, Margareth Kazuyo Kobayashi Dias Franco, Camila Morais Gonçalves da Silva, Laura Oliveira-Nascimento, Michelle Franz-Montan, Maria C Volpato, Luís F Cabeça, Eneida de Paula

J Pharm Pharmacol. 2017 Jun;69(6):652-662.

PMID: 28211640

Abstract:

Objectives:
Oxethazaine (OXZ) is one of the few local anaesthetics that provides analgesia at low pH, but presents poor solubility, cytotoxicity and no parenteral formulations. To address these issues, we aimed to prepare OXZ host-guest inclusion complex with hydroxypropyl-beta-cyclodextrin (HP-β-CD).
Methods:
The inclusion complex was formed by co-solubilization, followed by a job plot analysis to determine stoichiometry of complexation and dialysis equilibrium analysis (based on UV/VIS absorption and fluorescence profiles of OXZ). Complex formation was confirmed by phase-solubility data, X-ray, Scanning Electron Microscopy and DOSY-1 H-NMR experiments. In vitro cytotoxicity was analysed by MTT test in 3T3 fibroblasts. In vivo analgesia was tested by Von Frey test (inflammatory wounds - rats).
Key findings:
Oxethazaine complexed (1 : 1 molar ratio) with HP-β-CD, as indicated by loss of OZX crystalline structure (X-ray) and strong host: guest interaction (NMR, K = 198/M), besides increased solubility. In vitro cell survival improved with the complex (IC50 OXZ = 28.9 μm, OXZ : HP-β-CD = 57.8 μm). In addition, the complex (0.1% OXZ) promoted in vivo analgesia for the same time that 2% lidocaine/epinephrine did.
Conclusion:
Our results show that complexation improved physicochemical and biological properties of OXZ, allowing its application to inflamed tissues by parenteral routes.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP126272	Oxethazaine		126-27-2	Price

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