Polymeric nanospheres for topical delivery of vitamin D3

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• 作者：Tannaz Ramezanli^a ; ^b ; Brian E. Kilfoyle^a ; ^c ; Zheng Zhang^c ; ^d ; Bozena B. Michniak-Kohn^a ; ^b ; ^{Michniak@dls.rutgers.edu} ; ^{bomichniak@gmail.com}
• 关键词：SC ; stratum corneum ; VD3 ; vitamin D3 ; HPLC ; High Performance Liquid Chromatography ; DLS ; dynamic light scattering
• 刊名：International Journal of Pharmaceutics
• 出版年：2017
• 出版时间：10 January 2017
• 年：2017
• 卷：516
• 期：1-2
• 页码：196-203
• 全文大小：864 K
• 卷排序：516

文摘

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.