Abstract
Articaine (ATC) is one of the most widely used local anesthetics in dentistry. Despite its safety, local toxicity has been reported. This study aimed to develop an ATC-2- hydroxypropyl-β-cyclodextrin inclusion complex (ATC HPβCD) and to assess its toxicity in vitro. The inclusion complex was performed by solubilization, followed by a fluorimetric and job plot assay to determine the complex stoichiometry. Scanning electron microscopy, DOSY- 1 H-NMR, differential scanning calorimetry (DSC), and sustained release kinetics were used to confirm the inclusion complex formation. In vitro cytotoxicity was analyzed by MTT assay and immunofluorescence in HGF cells. Fluorimetric and job plot assay determined the inclusion complex stoichiometry (ATC:HPβCD = 1:1) and complex formation time (400 min), as indicated by a strong host/guest interaction (Ka = 117.8 M − 1), complexed fraction (f = 41.4%), and different ATC and ATC HPβCD melting points (172 °C e 235 °C, respectively). The mean of cell viability was 31.87% and 63.17% for 20-mM ATC and 20-mM ATC HPβCD, respectively. Moreover, remarkable cell toxicity was observed with free ATC by immunofluorescence. These results indicate the ATC HPβCD complex could be used to improve the safety of ATC. Further research are needed to establish the anesthetic safety and effectiveness in vivo .
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Acknowledgements
We thank PhD. Estefânia Campos and PhD. Jhones Luis Oliveira for the orientation during the DSC and the sustained release kinetics experiments. Also, we thank PhD. Débora Campanella Bastos for the support on immunofluorescence assay.
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This work was supported by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) and FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo), FAPESP #2015/20942-6.
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JBS, LENF, and MB contributed with the design the study, literature research, data collection, figure art, and manuscript preparation. LFC, LFF, and EP contributed with drug delivery systems preparation, conducted experiments and manuscript review. FCG and MCV contributed with the design the study, funding acquisition and manuscript review.
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Burga-Sánchez, J., Ferreira, L.E.N., Volpato, M.C. et al. Physicochemical characterization and cytotoxicity of articaine-2-hydroxypropyl-β-cyclodextrin inclusion complex. Naunyn-Schmiedeberg's Arch Pharmacol 393, 1313–1323 (2020). https://doi.org/10.1007/s00210-020-01879-1
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DOI: https://doi.org/10.1007/s00210-020-01879-1