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J Phys Chem B ; 118(1): 81-93, 2014 Jan 09.
Article in English | MEDLINE | ID: mdl-24321011

ABSTRACT

Me-ß-cyclodextrin (Me-ßCD) and HP-ß-cyclodextrin (HP-ßCD) 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 (1)H 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 (1)H NMR chemical shift values for the isoniazid (H6',8' and H5',9') and cyclodextrins (H3,5) C(1)H 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-ßCD 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.


Subject(s)
Anti-Bacterial Agents/pharmacology , Inclusion Bodies/chemistry , Isoniazid/pharmacology , Mycobacterium tuberculosis/drug effects , beta-Cyclodextrins/pharmacology , Anti-Bacterial Agents/chemical synthesis , Anti-Bacterial Agents/chemistry , Calorimetry, Differential Scanning , Dose-Response Relationship, Drug , Isoniazid/chemistry , Magnetic Resonance Spectroscopy , Microbial Sensitivity Tests , Protons , Quantum Theory , Structure-Activity Relationship , beta-Cyclodextrins/chemistry
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