Effect of Stabilizer on the Maximum Degree and Extent of Supersaturation and Oral Absorption of Tacrolimus Made by Ultra-rapid Freezing
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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.
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