Effect of stabilizer on the maximum degree and extent of supersaturation and oral absorption of tacrolimus made by ultra-rapid freezing

Kirk A. Overhoff, Jason T. McConville, Wei Yang, Keith P. Johnston, Jay I. Peters, Robert O. Williams

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

Purpose. Solid dispersions containing various stabilizers and tacrolimus (TAC) prepared by an Ultra-rapid Freezing (URF) process were investigated to determine the effect on their ability to form supersaturated solutions in aqueous media and on enhancing transport across biological membranes. Materials and Methods. The stabilizers included poly(vinyl alcohol; PVA), poloxamer 407 (P407), and sodium dodecyl sulfate (SDS). In vivo absorption enhancement in rats was also investigated. Dissolution studies were conducted at supersaturated conditions in both acidic media for 24 h and at delayed release (enteric) conditions to simulate intestinal transit. Results. The rank order of C/Ceq max in the dissolution studies at acidic conditions was URF-P407>URF-SDS>Prograf® (PRO)>URF-PVA:P407. For C/Ceq max under enteric conditions, the order was URF-SDS>PRO>URF- PVA:P407>URF-P407, and for the extent of supersaturation (AUC) in acidic and pH shift conditions it was URF-SDS>PRO>URF-PVA:P407>URF-P407. The pharmacokinetic data suggests URF-P407 had the greatest absorption having higher C max with a 1.5-fold increase in AUC compared to PRO. All URF compositions had a shorter T max compared to PRO. Conclusions. The nanostructured powders containing various stabilizing polymers formed by the URF process offer enhanced supersaturation characteristics leading to increased oral absorption of TAC.

Original languageEnglish (US)
Pages (from-to)167-175
Number of pages9
JournalPharmaceutical Research
Volume25
Issue number1
DOIs
StatePublished - Jan 2008

Keywords

  • Amorphous
  • In vitro-in vivo correlation
  • Nanoparticle
  • Particle engineering
  • Rapid freezing
  • Supersaturation
  • Tacrolimus

ASJC Scopus subject areas

  • Biotechnology
  • Molecular Medicine
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry
  • Pharmacology (medical)

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