Polymeric nanospheres for topical delivery of vitamin D3

Tannaz Ramezanli, Brian E. Kilfoyle, Zheng Zhang, Bozena B. Michniak-Kohn

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


This study investigates the potential application of polymeric nanospheres (known as TyroSpheres) as a formulation carrier for topical delivery of cholecalciferol (i.e., Vitamin D3, VD3) with the goal to improve the skin delivery and stability of VD3. High drug loading and binding efficiencies were obtained for VD3 when loaded in TyroSpheres. VD3 was released from TyroSpheres in a sustained manner and was delivered across the stratum corneum, which occurred independent of the initial drug loading. An ex vivo skin distribution study showed that TyroSphere formulations delivered 3–10 μg of active into the epidermis which was significantly higher than that delivered from Transcutol® (the control vehicle). In addition, an in vitro cytotoxicity assay using keratinocytes confirmed that VD3 encapsulation in the nanoparticles did not alter the drug activity. Photodegradation of VD3 followed zero-order kinetics. TyroSpheres were able to protect the active against hydrolysis and photodegradation, significantly enhancing the stability of VD3 in the topical formulation.

Original languageEnglish (US)
Pages (from-to)196-203
Number of pages8
JournalInternational Journal of Pharmaceutics
Issue number1-2
StatePublished - Jan 10 2017

All Science Journal Classification (ASJC) codes

  • Pharmaceutical Science


  • Nanoparticles
  • Photostability
  • Skin permeation
  • TyroSpheres
  • Vitamin D3


Dive into the research topics of 'Polymeric nanospheres for topical delivery of vitamin D3'. Together they form a unique fingerprint.

Cite this