Solid dispersion-based pellet for colon delivery of tacrolimus through time- and pH-dependent layer coating: preparation, in vitro and in vivo studies

  • Jian Guo Anhui University of Chinese Medicine, College of Pharmacy
  • Huihui Fang Anhui University of Chinese Medicine, College of Pharmacy
  • Shuangying Gui Anhui University of Chinese Medicine, College of Pharmacy https://orcid.org/0000-0001-6971-9679
  • Yuzhe Huang Anhui University of Chinese Medicine, College of Pharmacy
Keywords: Tacrolimus, Solid dispersion, Pellet, Oral colon-specific, Biodistribution

Abstract

The intent of the present investigation is to develop and evaluate colon-specific coated tacrolimus solid dispersion pellet (SDP) that retards drug release in the stomach and small intestine but progressively releases in the colon. Tacrolimus-SDP was prepared by extrusion-spheronization technology and optimized by the micromeritic properties including flowability, friability, yields and dissolution rate. Subsequently, the pH-dependent layer (Eudragit L30D55) and time-dependent layer (Eudragit NE30D and L30D55) were coated on the SDP to form tacrolimus colon-specific pellets (CSP) using a fluidized bed coater. Under in vitro gradient pH environment, tacrolimus only released from CSP after changing pH to 6.8 and then quickly released in the phosphate buffer solution of pH 7.2. The Cmax of CSP was 195.68 ± 3.14 ng/mL at Tmax 4.5 ± 0.24 h where as in case of SDP, the Cmax was 646.16 ± 8.15 ng/mL at Tmax 0.5 ± 0.03 h, indicating the ability of CSP targeted to colon. The highest area under the curve was achieved 2479.58 ± 183.33 ng·h/mL for SDP, which was 2.27-fold higher than tacrolimus suspension. However, the best biodistribution performance was achieved from CSP. In conclusion, SDP combining of pH- and time-dependent approaches was suitable for targeted delivery of tacrolimus to colon.

Downloads

Download data is not yet available.
Published
2019-12-05
How to Cite
Guo, J., Fang, H., Gui, S., & Huang, Y. (2019). Solid dispersion-based pellet for colon delivery of tacrolimus through time- and pH-dependent layer coating: preparation, in vitro and in vivo studies. Brazilian Journal of Pharmaceutical Sciences, 55, e17309. https://doi.org/10.1590/s2175-97902019000217309
Section
Articles