Theoretical and Experimental Study of Inclusion Complexes Formed by Isoniazid and Modified β-Cyclodextrins: 1H NMR Structural Determination and Antibacterial Activity Evaluation

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• 作者：Milena G. Teixeira ; Jo?o V. de Assis ; Cássia G. P. Soares ; Mateus F. Venancio ; Juliana F. Lopes ; Clebio S. Nascimento ; Jr ; Cleber P. A. Anconi ; Guilherme S. L. Carvalho ; Cristina S. Louren?o ; Mauro V. de Almeida ; Sergio A. Fernandes ; Wagner B. de Almeida
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：January 9, 2014
• 年：2014
• 卷：118
• 期：1
• 页码：81-93
• 全文大小：694K
• ISSN：1520-5207

文摘

Me-尾-cyclodextrin (Me-尾CD) and HP-尾-cyclodextrin (HP-尾CD) inclusion complexes with isoniazid (INH) were prepared with the aim of modulating the physicochemical and biopharmaceutical properties of the guest molecule, a well-known antibuberculosis drug. The architectures of the complexes were initially proposed according to NMR data Job plot and ROESY followed by density functional theory (DFT) calculations of ¹H NMR spectra using the PBE1PBE functional and 6-31G(d,p) basis set, including the water solvent effect with the polarizable continuum model (PCM), for various inclusion modes, providing support for the experimental proposal. An analysis of the ¹H NMR chemical shift values for the isoniazid (H6鈥?8鈥?and H5鈥?9鈥? and cyclodextrins (H3,5) C¹H hydrogens, which are known to be very adequately described by the DFT methodology, revealed them to be extremely useful, promptly confirming the inclusion complex formation. An included mode which describes Me-尾CD partially enclosing the hydrazide group of the INH is predicted as the most favorable supramolecular structure that can be used to explain the physicochemical properties of the encapsulated drug. Antibacterial activity was also evaluated, and the results indicated the inclusion complexes are a potential strategy for tuberculosis treatment.