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For the development of novel therapeutics, uncontrolled crystallization of drugs within delivery systems represents a major challenge. Especially for thin and flexible polymeric systems such as oral films or dermal wound dressings, the formation and growth of drug crystals can significantly affect drug distribution and release kinetics as well as physical(More)
In this study, we investigated the release mechanism of the poorly water soluble drug aprepitant from different amorphous solid dispersions using confocal Raman microscopy (CRM). Solid dispersions were fabricated based on either Soluplus®, as an amphiphilic copolymer and solubilizer, or on polyvinylpyrrolidone, as a hydrophilic polymer, in order to(More)
The purpose of this study was to investigate the therapeutic potential of budesonide loaded nanocarriers for the treatment of inflammatory bowel disease (IBD). First, budesonide was encapsulated in poly(lactic-co-glycolic) acid (PLGA) nanoparticles by an oil in water (O/W) emulsion technique. A second batch of the same nanoparticles was additionally coated(More)
Understanding the penetration behaviour of drugs into human skin is a prerequisite for the rational development and evaluation of effective dermal drug delivery. The general procedure for the acquisition of quantitative drug penetration profiles in human skin is performed by sequential segmentation and extraction. Unfortunately, this technique is(More)
Extrudates consisting of various ratios of tripalmitin and polyethylene glycol as matrix materials were produced below their melting temperatures. Tailor-made dissolution profiles for the model drug theophylline anhydrate were obtained by varying the matrix composition. The hydrophilic polymer polyethylene glycol increases the dissolution rate of the drug(More)
Dissolution testing is a crucial part of pharmaceutical dosage form investigations and is generally performed by analyzing the concentration of the released drug in a defined volume of flowing dissolution medium. As solid-state properties of the components affect dissolution behavior to a large and sometimes even unpredictable extent there is a strong need(More)
Crystal suspensions of 3 poorly soluble peptides (MSC1, 2 and 3), intended for intra-articular administration were prepared and in vitro release was tested by a modified USP IV apparatus, combined with a dialysis system. Half-lives of release profiles were ∼5 days for MSC1 and ∼0.5 days for MSC2 and MSC3, showing the potential to achieve sustained exposure(More)
Non-linear optics encompasses a range of optical phenomena, including two- and three-photon fluorescence, second harmonic generation (SHG), sum frequency generation (SFG), difference frequency generation (DFG), third harmonic generation (THG), coherent anti-Stokes Raman scattering (CARS), and stimulated Raman scattering (SRS). The combined advantages of(More)
Three monoacid triglycerides differing in their fatty acid chain lengths were extruded below their melting temperatures. Physical characterization was conducted on the powders as well as the extrudates with a combination of DSC, XRPD and vibrational spectroscopy to get a deeper insight into the complex solid-state behaviour of lipids and solid lipid(More)
A monoacid triglyceride and a partial glyceride were extruded below their melting ranges alone and together in different mixture ratios to investigate the influence of the chemical composition of the lipid matrix on the solid-state properties and dissolution characteristics. The partial glyceride exhibits a faster release of the drug compared to the(More)