Nanosuspensions as advanced printing ink for accurate dosing of poorly soluble drugs in personalized medicines.
ABSTRACT Folic acid was used as a model drug to demonstrate the advantages of formulating poorly soluble drugs as nanosuspensions and their use in an inkjet-type printing technique to produce personalized medicines. 10% folic acid nanosuspensions stabilized with Tween 20, a stabilizer showing the best wetting potential for folic acid, were prepared via high pressure homogenization. The particle size of the folic acid nanosuspension was well below 5 μm being a prerequisite for inkjet type printing technique. A good reproducibility of the particle size of folic acid nanosuspension prepared via high pressure homogenization was found. As indicated by the zeta potential the formulation showed a good storage stability. High pressure homogenization had no influence on the crystalline state of folic acid. An increase in the saturation solubility by 53.7% was found reducing the particle size from the micrometer range to the nanometer range. The dissolution velocity of the folic acid nanosuspension was significantly enhanced compared to a folic acid suspension, i.e. after 5 min 78.6% of the folic acid was dissolved from the nanosuspension and only 6.2% from the suspension. Moreover, the printing of 10% folic acid nanosuspension could be successfully demonstrated.
Article: Electrodeless electrohydrodynamic drop-on-demand encapsulation of drugs into porous polymer films for fabrication of personalized dosage units.[show abstract] [hide abstract]
ABSTRACT: Noncontact drop-on-demand (DOD) dosing is a promising strategy for manufacturing of personalized dosage units. However, current DOD methods developed for printing chemically and thermally stable, low-viscosity inks are of limited use for pharmaceuticals due to fundamentally different functional requirements. To overcome their deficiency, we developed a novel electrohydrodynamic (EHD) DOD (Appl, Phys, Lett. 97, 233501, 2010) that operates on fluids of up to 30 Pa·s in viscosity over a wide range of droplet sizes and provides a precise control over the droplet volume. We now evaluate the EHD DOD as a method for fabrication of dosage units by printing drug solutions on porous polymer films prepared by freeze-drying. Experiments were carried out on ibuprofen and griseofulvin, as model poorly water-soluble drugs, polyethylene glycol 400, as a drug carrier, and hydroxypropyl methylcellulose films. The similarities between drug release profiles from different dosage units were assessed by model-independent difference, f(1) , and similarity, f(2) , factors. The results presented show that EHD DOD offers a powerful tool for the evolving field of small-scale pharmaceutical technologies for tailoring medicines to individual patient's needs by printing a vast array of predefined amounts of therapeutics arranged in a specific pattern on a porous film.Journal of Pharmaceutical Sciences 04/2012; 101(7):2523-33. · 3.06 Impact Factor