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Magnetically stimulated ciprofloxacin release from polymeric microspheres entrapping iron oxide nanoparticles

Authors Sirivisoot S, Harrison BS

Received 13 February 2015

Accepted for publication 16 April 2015

Published 9 July 2015 Volume 2015:10(1) Pages 4447—4458

DOI https://doi.org/10.2147/IJN.S82830

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 4

Editor who approved publication: Dr Thomas J Webster

Sirinrath Sirivisoot,1 Benjamin S Harrison2

1Biological Engineering Program, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand; 2Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Wake Forest University Health Sciences, Winston-Salem, NC, USA

Abstract: To extend the external control capability of drug release, iron oxide nanoparticles (NPs) encapsulated into polymeric microspheres were used as magnetic media to stimulate drug release using an alternating magnetic field. Chemically synthesized iron oxide NPs, maghemite or hematite, and the antibiotic ciprofloxacin were encapsulated together within polycaprolactone microspheres. The polycaprolactone microspheres entrapping ciprofloxacin and magnetic NPs could be triggered for immediate drug release by magnetic stimulation at a maximum value of 40%. Moreover, the microspheres were cytocompatible with fibroblasts in vitro with a cell viability percentage of more than 100% relative to a nontreated control after 24 hours of culture. Macrophage cell cultures showed no signs of increased inflammatory responses after in vitro incubation for 56 hours. Treatment of Staphylococcus aureus with the magnetic microspheres under an alternating (isolating) magnetic field increased bacterial inhibition further after 2 days and 5 days in a broth inhibition assay. The findings of the present study indicate that iron oxide NPs, maghemite and hematite, can be used as media for stimulation by an external magnetic energy to activate immediate drug release.

Keywords: antibacterial, maghemite, hematite, Staphylococcus aureus

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