Publications by authors named "Duygu Yilmaz Usta"

In transdermal applications of nonsteroidal anti-inflammatory drugs, the rheological and mechanical properties of the dosage form affect the performance of the drug. The aim of this study to develop emulgel and nanostructured lipid carrier NLC-based gel formulations containing ibuprofen, evaluate their mechanical properties, bioadhesive value and ex-vivo rabbit skin permeability. All formulations showed non-Newtonian pseudoplastic behavior and their viscosity values are suitable for topical application.

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The study reported here aimed to develop and optimize the S-SNEDDS tablet of bosentan (BOS) and to investigate its pharmacokinetic and biodistribution properties. The BOS-loaded SNEDDS have been developed and characterized in a previous study. The BOS-loaded SNEDDS formulation was converted to S-SNEDDS using Neusilin® US2.

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Quantitative evaluation of drug dissolution characteristics based on mathematical models is essential to understand and predict a particular drug release profile. In this study, model-dependent evaluation of the dissolution kinetics of reference and five test products (25-mg, immediate-release (IR) tablets) of an antihypertensive drug, carvedilol, was carried out using the DDSolver program. The effects of pH (pH 1.

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This study aimed to develop and optimize a self-nanoemulsifying drug delivery system (SNEDDS) of bosentan (BOS) to solve its poor oral bioavailability due to low water solubility. A pseudo-ternary phase diagram was created based on the solubility and emulsification studies. The major components of the formulation were selected as glyceryl monolinoleate (lipid), polyoxyl 40 hydrogenated castor oil (surfactant), and caprylocaproyl polyoxyl-8 glycerides (co-surfactant).

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Tablet splitting is a common practice in clinical settings to lower doses, facilitate swallowing or save costs. Splitting devices can be used when hand splitting is difficult or painful. However, data on the accuracy of tablet splitting are limited and it presents a number of patient or formulation-related problems.

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Nowadays pharmaceutical industries and regulatory authorities suggest new approaches such as Quality by Design principles to reduce experiments of formulation studies, improve product quality, save cost and time. SeDeM Expert System is a predictive approach for the preformulation studies and it provides information about suitability of API for direct compression by evaluating 12 parameters. The system also allows selecting appropriate excipients by determining same parameters to improve compressibility of API.

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