scholarly journals Anion-induced water flux as drug release mechanism through cationic Eudragit RS 30D film coatings

2005 ◽  
Vol 7 (3) ◽  
pp. E668-E677 ◽  
Author(s):  
Karl G. Wagner ◽  
Ronny Gruetzmann
Keyword(s):  
Drug Release ◽  
Water Flux ◽  
Release Mechanism ◽  
Eudragit Rs ◽  
Film Coatings ◽  
Drug Release Mechanism ◽  
Eudragit Rs 30D

DESIGN AND CHARACTERIZATION OF ALFUZOSIN HCL GASTRORETENTIVE FLOATING MATRIX TABLETS EMPLOYING HPMC K 100M

INDIAN DRUGS ◽  
2018 ◽  
Vol 55 (11) ◽  
pp. 71-73
Author(s):  
Ch. Taraka Ramarao ◽  
◽  
J Vijaya Ratna ◽  
R. B. Srinivasa
Keyword(s):  
Drug Release ◽  
Dosage Forms ◽  
Matrix Tablets ◽  
Fickian Diffusion ◽  
Release Mechanism ◽  
Gastric Residence Time ◽  
Drug Release Mechanism ◽  
The Matrix ◽  
Gastro Retentive

The present investigation involves developing gastro retentive drug delivery systems (GFDDS) of alfuzosin HCl using HPMCK100M a is the matrixing agent and floating enhancer. Sodium bicarbonate in the acidic environment reacts with the acid and produces carbon dioxide. The gastro retentive tablets can be formulated to increase the gastric residence time and thereby increase the oral bioavailability. From the drug release study, it was concluded that the AFTB4 formula of HPMC K 100 M matrix tablets gives the controlled release up to 12 hours by showing increased release with floating lag time 24 seconds. Non – Fickian diffusion was the drug release mechanism from the matrix tablets formulated employing HPMC K 100 M. The matrix tablets (AFTB4) formulated employing 40 % HPMC K 100 M are best suited to be used for gastro retentive dosage form of alfuzosin HCl. Finally, it can be concluded that good candidates for the preparation of gastro retentive dosage forms due its gastric stability, gastric absorption and better bioavailability.

scholarly journals FORMULATION AND EVALUATION OF RAMIPRIL MOUTH DISSOLVING FILMS

2019 ◽  
pp. 124-129
Author(s):  
Jasvanth E ◽  
Teja D ◽  
Mounika B ◽  
Buchi N Nalluri
Keyword(s):  
Drug Release ◽  
Release Kinetics ◽  
Hydroxypropyl Methylcellulose ◽  
Release Mechanism ◽  
Onset Of Action ◽  
In Vitro Drug Release ◽  
Drug Release Mechanism ◽  
Preparation And Evaluation ◽  
Pvp K30

Objective: The present investigation was aimed at preparation and evaluation of mouth dissolving films (MDFs) of Ramipril to enhance patient convenience, compliance and to improve bioavailability. Methods: MDFs with 0.5% w/w Ramipril were prepared by a solvent casting method using a wet film applicator. The effects of film formers, wetting/solubilizing, saliva stimulating agents and film modifiers on the physicomechanical and in vitro Ramipril release from MDFs were evaluated. Results: The MDFs prepared were transparent, smooth and showed no re-crystallization upon storage. MDFs casted with hydroxypropyl methylcellulose (HPMC) E3 as film former and polyethylene glycol (PEG-400) as plasticizer showed superior Ramipril release rates and good physicomechanical properties when compared to MDFs with E5 and E15 as film formers. HPMC E3 MDFs with polyvinyl pyrrolidone K30 (PVP K30) and sodium lauryl sulphate (SLS) gave superior drug release properties than MDFs without PVP K30 and SLS. The HPMC E3 MDFs with citric acid (CA) as saliva stimulating and xylitol as soothing agent gave significantly superior in vitro drug release than the MDFs without CA and xylitol. Release kinetics data reveals diffusion as a drug release mechanism. Conclusion: From the obtained results, it can be concluded that the administration of Ramipril as MDF may provide a quick onset of action with enhanced oral bioavailability and therapeutic efficacy.

Auto-catalyzed poly(ortho ester) microspheres: a study of their erosion and drug release mechanism

2001 ◽  
Vol 75 (1-2) ◽  
pp. 11-25 ◽  
Author(s):  
Hui-Hui Chia ◽  
Yi-Yan Yang ◽  
Tai-Shung Chung ◽  
Steve Ng ◽  
Jorge Heller
Keyword(s):  
Drug Release ◽  
Release Mechanism ◽  
Ortho Ester ◽  
Drug Release Mechanism

scholarly journals 5-Fluorouracil Release from Chitosan-Based Matrix.Experimental and Theoretical Aspects

2020 ◽  
Vol 57 (3) ◽  
pp. 180-188
Author(s):  
Roxana Iancu ◽  
Stefan Andrei Irimiciuc ◽  
Maricel Agop ◽  
Mihail Frasila ◽  
Maria-Alexandra Paun ◽  
...  
Keyword(s):  
Drug Release ◽  
Polarized Light ◽  
Crosslinking Density ◽  
Fickian Diffusion ◽  
Release Mechanism ◽  
Morphological Aspects ◽  
Drug Release Mechanism ◽  
The Matrix

A series of four drug release formulations based on 5-fluorouracil encapsulated into a chitosan-based matrix were prepared by in situ hydrogelation with 3,7-dimethyl-2,6-octadienal. The formulations were investigated from structural and morphological aspects by FTIR spectroscopy, polarized light microscopy and scanning electron microscopy. It was established that 5-fluorouracil was anchored into the matrix as crystals, whose dimension varied as a function of the crosslinking density. The in vitro drug release simulated into a media mimicking the physiological environment revealed a progressive release of the 5-fluorouracil, in close interdependence with the crosslinking density. In the context of Pharmacokinetics behavioral analysis, a new mathematical procedure for describing drug release dynamics in polymer-drug complex system is proposed. Assuming that the dynamics of polymer-drug system�s structural units take place on continuous and nondifferentiable curves (multifractal curves), we show that in a one-dimensional hydrodynamic formalism of multifractal variables the drug release mechanism (Fickian diffusion, non-Fickian diffusion, etc) are given through synchronous dynamics at a differentiable and non-differentiable scale resolutions. Finally, the model is confirmed by the empirical data.

Techniques of Mucilage and Gum Modification and their Effect on Hydrophilicity and Drug Release

2020 ◽  
Vol 14 ◽  
Author(s):  
Rishabha Malviya ◽  
Vandana Tyagi ◽  
Dharmendra Singh
Keyword(s):  
Drug Release ◽  
Dosage Form ◽  
Extended Release ◽  
Release Mechanism ◽  
Release Agent ◽  
Drug Release Mechanism ◽  
Polymer Relaxation ◽  
Hydrophilic Matrices ◽  
The Matrix ◽  
High Degree

Aim: The manuscript aims to describe the techniques of modification of gums and mucilages and their effect on hydrophilicity and drug release. Discussion: The interest is increased in the fields of polymers which is obtained from natural origin and used in the preparation of pharmaceuticals. Mucilage and gum are natural materials, widely used in the preparation of novel dosage form and conventional dosage form. They are used in the pharmaceutical industry for various purposes like suspending, emulsifying, bio-adhesive, binding, matrix-forming, extended release and controlled release agent. Gum and mucilage are biodegradable, less toxic, cheap and easily available. Moreover, mucilage and gum can be changed to acquire tailored materials for the delivery of drugs and allow them to compete with commercially available synthetic products. These polysaccharides have unique swellability in an aqueous medium that can exert a retardant effect on drug release or act as a super disintegrant, depending on the concentration utilized in the preparation. Drug release mechanism from hydrophilic matrices consisting of gums and mucilages is based on solvent penetration-induced polymer relaxation, diffusion of entrapped drug followed by degradation or erosion of the matrix. Conclusion: The present manuscript highlight the advantages, modifications of gum and mucilage, their effects on hydrophilicity and drug release as well as aspects of the natural gums which can be assumed to be bifunctional excipient because of their concentration-dependent effect on drug release and their high degree of swellability.

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