Inclusion process of tetracycline in β and γ-cyclodextrins: a theoretical investigation

Abstract

The present Letter reports results from a comprehensive theoretical analysis of the inclusion process involving the tetracycline (TC) by β and γ-cyclodextrin (CD). Structure and stabilization energies were calculated, both in gas phase and aqueous solution, using a sequential methodology based on semiempirical and density functional theory (DFT) calculations. By the results, a qualitative structure–property relationship could be established with two main structural features being relevant for inclusion complex stabilization: (i) the depth of inclusion, which favors the hydrophobic contact inside the cavity of CDs and (ii) the hydrogen bonds established between guest and host molecules.