Hydroxyapatite Functionalized with 1,2-Hydroxypropyl-β-Cyclodextrin as Scaffolds for Antibiotic Release in Bone Tissue

Background: The difficulty of eliminating bacteria infecting bone tissue during bone healing treatments or surgery makes it desirably to develop solid scaffolds capable of sustained release of antibiotics to achieve the regeneration of the damaged tissue. Methods: With this function in view, in this work we prepared HA scaffolds functionalized with1,2- Hydroxypropyl-β-Cyclodextrin to increase the loading and sustained release for ciprofloxacin. Results: The lowest amount of CD was sufficient to fabricate HA functionalized microparticles and allowing for the CPX loading to be increased more than 40 times with respect to the non-functionalized HA particles. Spray-drying process rendered spherical particles with irregular surface that improved the release and the solubility of low soluble CPX in pH 7.4 medium in form of free drug and cyclodextrin complexes although free cyclodextrins were also released to the medium. Conclusion: It is concluded that the synthesized microparticles based on HA functionalized with Hydroxypropyl -β-Cyclodextrin merit further investigation to be used as platform for delivering antibiotics in bone regeneration.