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2. Sustained ibuprofen release using composite poly(lactic-co-glycolic acid)/titanium dioxide nanotubes from Ti implant surface.
- Author
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Jia H and Kerr LL
- Subjects
- Nanotubes ultrastructure, Polylactic Acid-Polyglycolic Acid Copolymer, Prostheses and Implants, Tensile Strength, Anti-Inflammatory Agents, Non-Steroidal administration & dosage, Delayed-Action Preparations chemistry, Ibuprofen administration & dosage, Lactic Acid chemistry, Nanotubes chemistry, Polyglycolic Acid chemistry, Titanium chemistry
- Abstract
Developing coatings on implant surface as drug carriers can reduce organ toxicity and effectively deliver drug locally to the target compared with the oral approach. Titanium dioxide (TiO2) nanotube has great potential for this application for widely used Ti implants because of its high surface area, ability to promote bone growth, and biocompatibility. However, there are two issues needed to be solved before further advancing TiO2 nanotubes technology as drug carriers: uncontrolled drug release and poor mechanical properties. In this study, a drug carrier using a composite of biodegradable polymer/TiO2 nanotubes is engineered. Ibuprofen is selected as a concept drug because it is a commonly used anti-inflammatory, fever, and pain-reducing drug. In addition, ibuprofen has a very short plasma half-life of only 1-3 h. A simple characterization method is developed to investigate the infiltration of polymer into TiO2 nanotubes. Good infiltration was observed of polymer into TiO2 nanotubes. The synthesized drug carrier demonstrated much better sustained drug release profiles for ibuprofen of 5 days (low-molecular-weight polymer) and 9 days (high-molecular-weight polymer) compared with 30 min of pure TiO2 nanotubes. The drug carrier also exhibited much improved mechanical strength and flexibility compared with pure TiO2 nanotubes., (Copyright © 2013 Wiley Periodicals, Inc.)
- Published
- 2013
- Full Text
- View/download PDF
3. Inkjet printing of drug substances and use of porous substrates-towards individualized dosing.
- Author
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Sandler N, Määttänen A, Ihalainen P, Kronberg L, Meierjohann A, Viitala T, and Peltonen J
- Subjects
- Acetaminophen administration & dosage, Acetaminophen chemistry, Administration, Oral, Caffeine administration & dosage, Caffeine chemistry, Chromatography, Liquid, Mass Spectrometry, Pharmaceutical Preparations chemistry, Porosity, Solutions, Theophylline administration & dosage, Theophylline chemistry, Dosage Forms, Paper, Pharmaceutical Preparations administration & dosage, Precision Medicine, Printing methods, Technology, Pharmaceutical methods
- Abstract
Medicines are most often oral solid dosage forms made into tablets or capsules, and there is little room for individualized doses. The drug substance and additives are processed through multiple production phases, including complex powder handling steps. In drug manufacturing, the control of the solid-state properties of active pharmaceutical ingredient (API) is essential and it offers opportunities for enhancement of drug delivery systems. In this context, inkjet printing technologies have emerged over the last decades in pharmaceutical and biological applications and offer solutions for controlling material and product characteristics with high precision. Here we report the concept of conventional inkjet printing technology to produce printable pharmaceutical dosage forms on porous substrates. Data are shown to demonstrate inkjet printing of APIs into paper substrates, and how the model drug substances (paracetamol, theophylline, and caffeine) are penetrating the porous substrates used. The method enables controlling not only the deposition but also the crystallization of the drug substances. We anticipate that the inkjet printing approach has immense potential in making sophisticated drug delivery systems by use of porous substrates in the future. For example, it may offer new perspectives for solving problems around poorly soluble drugs and dosing low-dose medicines accurately. Furthermore, with the advent of genetic mapping of humans, controlled inkjet dosing can bring solutions to fabricate on-demand individualized medicines for patients., (Copyright © 2011 Wiley-Liss, Inc.)
- Published
- 2011
- Full Text
- View/download PDF
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