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Design and physicochemical characterization of advanced spray-dried tacrolimus multifunctional particles for inhalation.

Wu X, Hayes D, Zwischenberger JB, Kuhn RJ, Mansour HM - Drug Des Devel Ther (2013)

Bottom Line: Increasing the pump rate percent of tacrolimus solution resulted in a larger particle size.Conclusively, advanced spray-drying particle engineering design from organic solution in closed mode was successfully used to design and optimize solid-state particles in the respirable size range necessary for targeted pulmonary delivery, particularly for the deep lung.These particles were dry, stable, and had optimal properties for dry powder inhalation as a novel pulmonary nanomedicine.

View Article: PubMed Central - PubMed

Affiliation: University of Kentucky, College of Pharmacy, Department of Pharmaceutical Sciences-Drug Development Division, Lexington, KY 40536-0596 , USA.

ABSTRACT
The aim of this study was to design, develop, and optimize respirable tacrolimus microparticles and nanoparticles and multifunctional tacrolimus lung surfactant mimic particles for targeted dry powder inhalation delivery as a pulmonary nanomedicine. Particles were rationally designed and produced at different pump rates by advanced spray-drying particle engineering design from organic solution in closed mode. In addition, multifunctional tacrolimus lung surfactant mimic dry powder particles were prepared by co-dissolving tacrolimus and lung surfactant mimic phospholipids in methanol, followed by advanced co-spray-drying particle engineering design technology in closed mode. The lung surfactant mimic phospholipids were 1,2-dipalmitoyl-sn-glycero-3-phosphocholine and 1,2-dipalmitoyl-sn-glycero-3-[phosphor-rac-1-glycerol]. Laser diffraction particle sizing indicated that the particle size distributions were suitable for pulmonary delivery, whereas scanning electron microscopy imaging indicated that these particles had both optimal particle morphology and surface morphology. Increasing the pump rate percent of tacrolimus solution resulted in a larger particle size. X-ray powder diffraction patterns and differential scanning calorimetry thermograms indicated that spray drying produced particles with higher amounts of amorphous phase. X-ray powder diffraction and differential scanning calorimetry also confirmed the preservation of the phospholipid bilayer structure in the solid state for all engineered respirable particles. Furthermore, it was observed in hot-stage micrographs that raw tacrolimus displayed a liquid crystal transition following the main phase transition, which is consistent with its interfacial properties. Water vapor uptake and lyotropic phase transitions in the solid state at varying levels of relative humidity were determined by gravimetric vapor sorption technique. Water content in the various powders was very low and well within the levels necessary for dry powder inhalation, as quantified by Karl Fisher coulometric titration. Conclusively, advanced spray-drying particle engineering design from organic solution in closed mode was successfully used to design and optimize solid-state particles in the respirable size range necessary for targeted pulmonary delivery, particularly for the deep lung. These particles were dry, stable, and had optimal properties for dry powder inhalation as a novel pulmonary nanomedicine.

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Gravimetric water vapor absorption isotherms for raw tacrolimus versus organic solution advanced spray-dried dry powder inhalation tacrolimus at various spray-drying pump rates.Abbreviations: SDT10, spray-dried tacrolimus prepared at 10% pump rate; SDT25, spray-dried tacrolimus prepared at 25% pump rate; SDT50, spray-dried tacrolimus prepared at 50% pump rate; SDT75, spray-dried tacrolimus prepared at 75% pump rate.
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f11-dddt-7-059: Gravimetric water vapor absorption isotherms for raw tacrolimus versus organic solution advanced spray-dried dry powder inhalation tacrolimus at various spray-drying pump rates.Abbreviations: SDT10, spray-dried tacrolimus prepared at 10% pump rate; SDT25, spray-dried tacrolimus prepared at 25% pump rate; SDT50, spray-dried tacrolimus prepared at 50% pump rate; SDT75, spray-dried tacrolimus prepared at 75% pump rate.

Mentions: As shown in Figure 11, when the RH level exceeded just 20%, which is a low RH level, raw tacrolimus did not absorb any additional water vapor (ie, a plateau is reached at ~20% RH and remains relatively constant thereafter), due to its crystalline nature. This is a characteristic property of crystalline powders. This plateau value is also in excellent agreement with the KF value for raw tacrolimus powder. Contrastingly, the spray-dried powders do not exhibit a significant plateau region over any RH range, and continue to take up more water vapor at RH levels of 90% and higher under equilibrium conditions, which is characteristic of amorphous powders.


Design and physicochemical characterization of advanced spray-dried tacrolimus multifunctional particles for inhalation.

Wu X, Hayes D, Zwischenberger JB, Kuhn RJ, Mansour HM - Drug Des Devel Ther (2013)

Gravimetric water vapor absorption isotherms for raw tacrolimus versus organic solution advanced spray-dried dry powder inhalation tacrolimus at various spray-drying pump rates.Abbreviations: SDT10, spray-dried tacrolimus prepared at 10% pump rate; SDT25, spray-dried tacrolimus prepared at 25% pump rate; SDT50, spray-dried tacrolimus prepared at 50% pump rate; SDT75, spray-dried tacrolimus prepared at 75% pump rate.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3569053&req=5

f11-dddt-7-059: Gravimetric water vapor absorption isotherms for raw tacrolimus versus organic solution advanced spray-dried dry powder inhalation tacrolimus at various spray-drying pump rates.Abbreviations: SDT10, spray-dried tacrolimus prepared at 10% pump rate; SDT25, spray-dried tacrolimus prepared at 25% pump rate; SDT50, spray-dried tacrolimus prepared at 50% pump rate; SDT75, spray-dried tacrolimus prepared at 75% pump rate.
Mentions: As shown in Figure 11, when the RH level exceeded just 20%, which is a low RH level, raw tacrolimus did not absorb any additional water vapor (ie, a plateau is reached at ~20% RH and remains relatively constant thereafter), due to its crystalline nature. This is a characteristic property of crystalline powders. This plateau value is also in excellent agreement with the KF value for raw tacrolimus powder. Contrastingly, the spray-dried powders do not exhibit a significant plateau region over any RH range, and continue to take up more water vapor at RH levels of 90% and higher under equilibrium conditions, which is characteristic of amorphous powders.

Bottom Line: Increasing the pump rate percent of tacrolimus solution resulted in a larger particle size.Conclusively, advanced spray-drying particle engineering design from organic solution in closed mode was successfully used to design and optimize solid-state particles in the respirable size range necessary for targeted pulmonary delivery, particularly for the deep lung.These particles were dry, stable, and had optimal properties for dry powder inhalation as a novel pulmonary nanomedicine.

View Article: PubMed Central - PubMed

Affiliation: University of Kentucky, College of Pharmacy, Department of Pharmaceutical Sciences-Drug Development Division, Lexington, KY 40536-0596 , USA.

ABSTRACT
The aim of this study was to design, develop, and optimize respirable tacrolimus microparticles and nanoparticles and multifunctional tacrolimus lung surfactant mimic particles for targeted dry powder inhalation delivery as a pulmonary nanomedicine. Particles were rationally designed and produced at different pump rates by advanced spray-drying particle engineering design from organic solution in closed mode. In addition, multifunctional tacrolimus lung surfactant mimic dry powder particles were prepared by co-dissolving tacrolimus and lung surfactant mimic phospholipids in methanol, followed by advanced co-spray-drying particle engineering design technology in closed mode. The lung surfactant mimic phospholipids were 1,2-dipalmitoyl-sn-glycero-3-phosphocholine and 1,2-dipalmitoyl-sn-glycero-3-[phosphor-rac-1-glycerol]. Laser diffraction particle sizing indicated that the particle size distributions were suitable for pulmonary delivery, whereas scanning electron microscopy imaging indicated that these particles had both optimal particle morphology and surface morphology. Increasing the pump rate percent of tacrolimus solution resulted in a larger particle size. X-ray powder diffraction patterns and differential scanning calorimetry thermograms indicated that spray drying produced particles with higher amounts of amorphous phase. X-ray powder diffraction and differential scanning calorimetry also confirmed the preservation of the phospholipid bilayer structure in the solid state for all engineered respirable particles. Furthermore, it was observed in hot-stage micrographs that raw tacrolimus displayed a liquid crystal transition following the main phase transition, which is consistent with its interfacial properties. Water vapor uptake and lyotropic phase transitions in the solid state at varying levels of relative humidity were determined by gravimetric vapor sorption technique. Water content in the various powders was very low and well within the levels necessary for dry powder inhalation, as quantified by Karl Fisher coulometric titration. Conclusively, advanced spray-drying particle engineering design from organic solution in closed mode was successfully used to design and optimize solid-state particles in the respirable size range necessary for targeted pulmonary delivery, particularly for the deep lung. These particles were dry, stable, and had optimal properties for dry powder inhalation as a novel pulmonary nanomedicine.

Show MeSH
Related in: MedlinePlus