12. September 2018
The amorphous solid dispersion (ASD) technique has been employed to formulate poorly-soluble drugs, however, development of solid dosage forms with ASD is challenging due to the high propensity of amorphous drug to precipitate upon dissolution. Thus this work aimed to explore the potential of controlled release amorphous solid dispersion (CRASD) systems using polyvinyl acetate (PVAc) as a release-retarding excipient to mitigate the drug precipitation during dissolution of poorly water-soluble...
11. January 2018
The oral bioavailability of poorly water-soluble active pharmaceutical ingredients (APIs) can be improved by the preparation of amorphous solid dispersions (ASDs) where the API is dissolved in polymeric excipients. Desired properties of such ASDs like storage stability, dissolution behavior, and processability can be optimized by additional excipients. In this work, the influence of so-called low-molecular-weight excipients (LMWEs) on the phase behavior of ASDs was investigated.
18. October 2017
In the drug delivery area, versatile therapeutic systems intended to yield customized combinations of drugs, drug doses and release kinetics have drawn increasing attention, especially because of the advantages that personalized pharmaceutical treatments would offer.
12. February 2017
Abstract In this study, hypromellose acetate succinate (HPMCAS) stable submicronic particles loaded with a soy isoflavones extract, have been obtained by nano spray drying technology. HPMCAS has been used as excipient able to increase both stability and supersaturation levels of the active ingredients hence able to enhance skin penetration performance of genistein and daidzein. The influence of polymer/extract ratio as other process variables, on particle size, morphology and permeation...
09. February 2017
ABSTRACT Objective: Transmucosal buccal drug delivery could be an alternative for oral administration for systemic delivery of Verapamil Hydrochloride (VH), as it has low bioavailability 20 - 35 % due to its extensive rst pass metabo- lism and variable absorption at GIT. Method: Buccal patches of VH were prepared by solvent casting method using bioadhesive polymers HPMC K4M, Carbopol 934P, Chitosan acetate and Okra mucilage isolated from Hibiscus esculantus fruits, in various combinations as...
08. November 2016
Abstract The objective was to investigate poly vinyl acetate (Kollicoat® SR 30 D) and ammonio methacrylate copolymer (Eudragit® RL 30 D) blends as coatings to increase the mechanical robustness of hydroxypropyl methylcellulose (HPMC) matrix tablets. Poly vinyl acetate (Kollicoat® SR 30 D – KSR) was selected for its flexibility and ammonio methacrylate copolymer (Eudragit® RL 30 D – ERL) because of its high permeability. Films based on KSR:ERL blends were prepared by casting or spraying...
04. August 2016
Objectives: To develop orodispersible films (ODF) based on hydrophobic polymers with higher stability to ordinary environmental humidity conditions without compromising their fast disintegration time. Methods: A quality by design approach was applied to screen three different formulations each one based on a different hydrophobic polymer: polyvinyl acetate, methacrylate-based copolymer and shellac. The screening formulations were characterized regarding their mechanical properties, residual...
25. June 2016
The meeting of the Pharmacopoeial Discussion Group (PDG) [European Pharmacopoeia (Ph.Eur.), Japanese Pharmacopoeia (JP), and the United States Pharmacopeia (USP)] was hosted by EDQM in Strasbourg, France, 25-26 May 2016. To date, 29 of the 36 General Chapters and 49 of the 67 excipient monographs on the current work programme have been harmonised. Sign-offs at this meeting include a new monograph on Hydroxyethylcellulose and two revised monographs on Ethylcellulose & Cellulose acetate....
25. June 2016
Abstract In this study we present the use of co-axial electrospinning to produce core-shell composite micro-/nano- fibers of Polyurethane (PU) and Cellulose acetate phthalate (CAP). The designed fibers possess enhanced mechanical properties with a tensile strength of 13.27 ± 2.32 MPa, which is a clear improvement over the existing CAP fibers that suffer from a poor mechanical strength (0.2 ± 0.03 MPa). The CAP imparts pH responsiveness to the core-shell structure giving the fibers potential...
12. June 2016
Introduction: Amorphous solid dispersions are considered as one of the most powerful strategies to formulate poorly soluble drugs. They are made up of an active pharmaceutical ingredient (API) dispersed at the molecular level in an amorphous polymeric carrier. As the latter component constitutes the largest part of the formulation, its characteristics will contribute to a large extent to the properties and behavior of the solid dispersion. Areas covered: Amorphous polymers are most often used...