The use of mucoadhesive polymers in buccal drug delivery.

Swelling studies and in vitro release of verapamil from calcium alginate and calcium alginate-chitosan beads.

Carrageenan and its applications in drug delivery.

Advances in oral nano-delivery systems for colon targeted drug delivery in inflammatory bowel disease: selective targeting to diseased versus healthy tissue.

Purpose. To investigate the suitability of an SCMC (sodium carboxymethyl cellulose/polyethylene glycol 400/carbopol 934P) and an HPMC (hydroxypropylmethyl cellulose/polyethylene glycol 400/carbopol 934P) films as drug vehicle for buccal delivery. Methods. The mechanical and in vitro bioadhesive strength properties of the films were investigated using texture analyzer equipment, while swelling behavior was studied in different media, namely, distilled water and simulated saliva solution. In addition, the in vivo bioadhesion of the film was studied by estimating the film residence time on buccal mucosa of human volunteers. Results. Increase in carbopol 934P content was found to elevate the elasticity, softness and bioadhesive strength but decrease the strength and degree of swelling of both SCMC and HPMC films. SCMC films swelled more extensively in distilled water while HPMC films in simulated saliva solution. HPMC films exhibited greater in vivo bioadhesion although the in vitro bioadhesive strength was lower than SCMC films. Correlation existed between the in vivo and in vitro bioadhesion data within the polymer, but no rank correlation was observed between the two polymers. Conclusion. HPMC films may be preferred over SCMC films as

/pdf/polymeric-films-as-vehicle-for-buccal-delivery-swelling-l61dk07ozn.pdf

Polymeric films as vehicle for buccal delivery: swelling, mechanical, and bioadhesive properties.

Preparation and in vitro evaluation of Eudragit microspheres containing acetazolamide.

Preparation and in vitro evaluation of verapamil HCl and ibuprofen containing carrageenan beads.

Controlled-release buccoadhesive tablets containing pindolol were prepared and evaluated in order to achieve constant plasma concentrations during the treatment of chronic hypertension and to improve the bioavailability of pindolol by the avoidance of hepatic first-pass metabolism. The formulations were tested for weight, hardness, friability, content uniformity, swelling rate, bioadhesive force, and drug release rate values. Carbopol 934 and NaCMC were used as bioadhesive polymers and Methocel K4M, Methocel K15M, and HPC were added as matrix-forming polymers.

Development and In Vitro Evaluation of a Buccoadhesive Pindolol Tablet Formulation

New vehicles were developed based on non-aqueous emulsions. They may be classified as progress or supplimentation to the actual respectively conventional filling masses for soft gelatin capsules, but also for liquid or semi-solid hard gelatin capsule filling techniques.IN-VITRO dissolution rate studies exhibit a clear superiority of PEG filling masses about oil-wax bases, which show extremely slow release rates.These experiencies may therefore open an interesting way of attaining better bioavailabilities in certain cases with soft gelatin capsules as well as with hard gelatin capsules.But in the following corresponding IN-VIVO tests, which are carried out as urine recoveries, the whole loss of superiority of the PEG compounds is impressingly shown. On the contrary the PEG bases exhibit IN-VIVO the lowest recoveries, while the non-aqueous emulsions at least those with the Riboflavin indicate a tendency towards a more favorable gastrointestinal absorption.

Non-Aqueous Emulsions as Vehicles for Capsule Fillings

The most commonly used surgical technique for repairing segmental nerve defects is autogenous nerve grafting; however, this method causes donor site morbidity. In this study, we sought to produce prefabricated nerve grafts that can serve as a conduit instead of autologous nerve using a controlled release system created with vascular endothelial growth factor (VEGF)-loaded poly(lactic-co-glycolic acid) (PLGA) microspheres. The study was performed in vitro and in vivo. For the in vitro studies, VEGF-loaded PLGA microspheres were prepared. Thirty rats were used for the in vivo studies. Vein grafts were sutured between the tibial and peroneal nerves in all animals. Three groups were created, and an epineural window, partial incision, and microsphere application were performed, respectively. Walking track analysis, morphologic, and electron microscopic assessment were performed at the end of the eight weeks. Microspheres were produced in spherical shapes as required. Controlled release of VEGF was achieved during a 30-days period. Although signs of nerve injury occurred initially in the partial incision groups according to the indexes of peroneal and tibial function, it improved gradually. The index values were not affected in the other groups. There were many myelinated fibers with large diameters in the partial incision and controlled release groups, while a few myelinated fibers that passed through vein graft in the epineural window group. Thereby, prefabrication was carried out for the second and third groups. It was demonstrated that nerve graft can be prefabricated by the controlled delivery of VEGF. © 2012 Wiley Periodicals, Inc. Microsurgery, 2012.

Vascular endothelial growth factor-loaded poly(lactic-co-glycolic acid) microspheres-induced lateral axonal sprouting into the vein graft bridging two healthy nerves: nerve graft prefabrication using controlled release system.

Betül Dortunç

Papers

Preparation and in vitro evaluation of Eudragit microspheres containing acetazolamide.

Preparation and in vitro evaluation of verapamil HCl and ibuprofen containing carrageenan beads.

Development and In Vitro Evaluation of a Buccoadhesive Pindolol Tablet Formulation

Non-Aqueous Emulsions as Vehicles for Capsule Fillings

Vascular endothelial growth factor-loaded poly(lactic-co-glycolic acid) microspheres-induced lateral axonal sprouting into the vein graft bridging two healthy nerves: nerve graft prefabrication using controlled release system.