scholarly journals Drug release rate in vitro and bioavailability of new controlled release suspension of spherical matrix of ibuprofen.

1989 ◽  
Vol 4 (2) ◽  
pp. 100-104
Author(s):  
Yoshiaki Kawashima ◽  
Taro Iwamoto ◽  
Toshiyuki Niwa ◽  
Hirofumi Takeuchi ◽  
Tomoaki Hino ◽  
...  
Keyword(s):  
Controlled Release ◽  
Drug Release ◽  
Release Rate ◽  
Drug Release Rate

Formulation Development and Characterization of controlled release core in cup matrix tablets of venlafaxine HCl

2020 ◽  
Vol 15 ◽  
Author(s):  
Balaji Maddiboyina ◽  
Vikas Jhawat ◽  
Gandhi Sivaraman ◽  
Om Prakash Sunnapu ◽  
Ramya Krishna Nakkala ◽  
...  
Keyword(s):  
Controlled Release ◽  
Drug Release ◽  
Release Rate ◽  
Zero Order ◽  
Water Soluble ◽  
Matrix Tablets ◽  
Drug Dissolution ◽  
Crystalline Cellulose ◽  
Hydrophobic Polymers

Background: Venlafaxine HCl is a selective serotonin reuptake inhibitor which is given in the treatment of depression. The delivery of the drug at a controlled rate can be of great importance for prolonged effect. Objective: The objective was to prepare and optimize the controlled release core in cup matrix tablet of venlafaxine HCl using the combination of hydrophilic and hydrophobic polymers to prolong the effect with rate controlled drug release. Methods: The controlled release core in cup matrix tablets of venlafaxine HCl were prepared using HPMC K5, K4, K15, HCO, IPA, aerosol, magnesium sterate, hydrogenated castor oil and micro crystalline cellulose PVOK-900 using wet granulation technique. Total ten formulations with varying concentrations of polymers were prepared and evaluated for different physicochemical parameters such FTIR analysis for drug identification, In-vitro drug dissolution study was performed to evaluate the amount of drug release in 24 hrs, drug release kinetics study was performed to fit the data in zero order, first order, Hixson–crowell and Higuchi equation to determine the mechanism of drug release and stability studies for 3 months as observed. Results: The results of hardness, thickness, weight variation, friability and drug content study were in acceptable range for all formulations. Based on the In vitro dissolution profile, formulation F-9 was considered to be the optimized extending the release of 98.32% of drug up to 24 hrs. The data fitting study showed that the optimized formulation followed the zero order release rate kinetics and also compared with innovator product (flavix XR) showed better drug release profile. Conclusion: The core-in-cup technology has a potential to control the release rate of freely water soluble drugs for single administration per day by optimization with combined use of hydrophilic and hydrophobic polymers.

Microorganism-based monodisperse microcapsules: encapsulation of the fungicide tebuconazole and its controlled release properties

RSC Advances ◽  
2015 ◽  
Vol 5 (32) ◽  
pp. 25164-25170 ◽  
Author(s):  
Bo Zhang ◽  
Teng Zhang ◽  
Quanxi Wang ◽  
Tianrui Ren
Keyword(s):  
Controlled Release ◽  
Powdery Mildew ◽  
Drug Release ◽  
Release Rate ◽  
Drug Release Rate ◽  
Burst Effect ◽  
Initial Burst ◽  
Release System ◽  
Controlled Release System ◽  
Monodisperse Microcapsules

A controlled release system was prepared, it based on UF modified PCC cells in which TEB are loaded into cells. It can control the drug release rate, depress the initial “burst effect”, and was efficacious in controlling wheat powdery mildew.

The effect of molecular structure on the anticancer drug release rate from prodrug nanoparticles

2015 ◽  
Vol 51 (64) ◽  
pp. 12835-12838 ◽  
Author(s):  
Yoshikazu Ikuta ◽  
Yoshitaka Koseki ◽  
Tsunenobu Onodera ◽  
Hidetoshi Oikawa ◽  
Hitoshi Kasai
Keyword(s):  
Molecular Structure ◽  
Controlled Release ◽  
Drug Release ◽  
Anticancer Drug ◽  
Release Rate ◽  
Chemical Structure ◽  
Anticancer Agent ◽  
Drug Release Rate ◽  
Drug Nanoparticles

The controlled release of an anticancer agent from drug nanoparticles could be successfully achieved by optimizing the chemical structure of dimeric compounds as prodrug.

Effects of Four Mesostructures on their Drug Release Properties

2013 ◽  
Vol 645 ◽  
pp. 125-128
Author(s):  
Wei Zeng
Keyword(s):  
Drug Release ◽  
Mesoporous Materials ◽  
Release Rate ◽  
Drug Efficacy ◽  
Drug Release Rate ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous ◽  
Fast Release ◽  
Mcm 41

Five ordered mesoporous materials, SBA-1, MCM-48, SBA-7, MCM-41 and SBA-15, were prepared and tested as mesophase drug delivery systems with an anti-inflammatory drug, ibuprofen. The results of these mesostructures on in vitro ibuprofen delivery indicated that the mesoporous materials with cage-like structure, SBA-1 and SBA-7, had unfavorable load and release properties. MCM-48 also showed fast release rate due to its opening channel. However, the hexagonal mesostructure in MCM-41 and SAB-15 was advantageous for extending drug release rate although a little difference existed between them. Compared with commercial ibuprofen capsule, the release system based on MCM-41 materials displayed the drug efficacy in a longer time.

Development of Acrylic Matrix Type Ketoprofen Patch

2012 ◽  
Vol 506 ◽  
pp. 533-536
Author(s):  
Nanthida Wonglertnirant ◽  
S. Tipwichai ◽  
Praneet Opanasopit ◽  
Theerasak Rojanarata ◽  
Suwannee Panomsuk ◽  
...  
Keyword(s):  
Drug Release ◽  
Release Rate ◽  
Pressure Sensitive Adhesive ◽  
Drug Release Rate ◽  
Matrix Type ◽  
Adhesive Matrix ◽  
Pressure Sensitive ◽  
Transdermal Patches ◽  
Significant Difference

Ketoprofen transdermal patches (KTPs) were fabricated using an acrylic pressure sensitive adhesive (PSA) polymer. The influence of different factors (amount of PSA, drug content, and pressure applying on the backing membrane during preparation) on the characteristics of ketoprofen patch (thickness, W/A ratio, and adhesiveness of matrix film) and in vitro drug release behavior were investigated. The results revealed the successful fabrication and a good physical appearance of KTPs using acrylic PSA. Microscopic observations, FTIR spectra, and DSC thermograms were permitted to demonstrate that the drug was dispersed molecularly in the polymer. As the amount of PSA in the adhesive matrix was increased, the release rate of ketoprofen was decreased. Contrarily, the drug release rate was increased corresponding to the increase of ketoprofen content in the adhesive matrix. There was no significant difference in the release rate when the pressure applying on the backing membrane was varied. The kinetic of ketoprofen release from acrylic matrix type transdermal patches followed the Higuchis diffusion model.

Preparation of Liquid Oral Mucoadhesive Gastro-retentive System of Nimodipine

2019 ◽  
Vol 16 (9) ◽  
pp. 862-871 ◽  
Author(s):  
Mai Mamdouh ◽  
Ahmed Donia ◽  
Ebtessam Essa ◽  
Gamal El Maghraby
Keyword(s):  
Critical Care ◽  
Controlled Release ◽  
Drug Release ◽  
Release Rate ◽  
Poloxamer 407 ◽  
Liquid Form ◽  
Drug Release Rate ◽  
Alginate Concentration ◽  
Gastro Retentive

Background: Nimodipine is a calcium channel blocker frequently used in critical care settings. It is mainly absorbed in the upper gastrointestinal tract. Accordingly, the development of gastroretentive formulation will be beneficial. The benefit would be maximized for critical care patients if the developed system was in liquid form to facilitate the administration through nasogastric tubing. Objective: Development of gastro-retentive liquid oral controlled release formulation of nimodipine through in situ gellation. Methods: Nimodipine dissolution was improved by solid dispersion (SD) using poloxamer 407. Sodium alginate solutions (1, 1.5 and 2%w/v) were loaded with the optimized SD microparticles. Carboxymethylcellulose was added to modulate the release and to augment mucoadhesion power. All in situ gelling alginate solutions were characterized regarding viscosity, gelling capacity and drug release. SD microparticles showed considerable improvement in nimodipine dissolution. Results: All alginate systems were pourable. Increasing alginate concentration increased the gelling capacity and reduced drug release rate. The addition of carboxymethylcellulose produced greater control over drug release rate. X-ray radiography showed successful stomach-retention over 8 hours in rabbits, which correlates with the controlled release pattern of the developed systems. Conclusion: The study provides the formulator with a range of gastroretentive controlled release formulations of nimodipine while maintaining the convenience of administration through nasogastric tubing with the potential for enhanced bioavailability.

Lipid-Based Implants: Impact of Formulation Parameters

2014 ◽  
Vol 1060 ◽  
pp. 87-90
Author(s):  
Marisa Nicolai ◽  
Vanessa Amaral ◽  
Cátia Antunes ◽  
Duangratana Shuwisitkul ◽  
Joana Portugal Mota
Keyword(s):  
Controlled Release ◽  
Drug Release ◽  
Release Rate ◽  
Release Rates ◽  
Drug Release Rate ◽  
Blend Ratio ◽  
Drug Type ◽  
Formulation Parameters ◽  
Blend Ratios ◽  
Aqueous Solubilities

Lipid implants have been attracting attention in recent years. However, to better understand these systems, more fundamental studies are required. The objective of this work was to evaluate the effect of some formulation parameters, namely lipid and drug type, implant shape/surface area and lipid blend ratio, on drug release rate. The developed implants were cylindrical or spherical in shape with an even surface. Caffeine release from glycerol-trimyristate implant was very fast when compared with glycerol-tristerate matrix. The latter allowed a 4 month controlled release in contrast with glycerol-trimyristate matrix (~ 5 days). Caffeine and theophylline presented similar release rates, despite their different aqueous solubilities. In addition, different lipid blend ratios provided different release profiles for caffeine.

Preparation of poly(sebacic anhydride) and polylactic acid pills used as drug carrier for levofloxacin controlled release

2013 ◽  
Vol 33 (7) ◽  
pp. 659-664 ◽  
Author(s):  
Zhuan Zhang ◽  
Liao-Bing Chen ◽  
Jie Gao ◽  
Feng Bao ◽  
Jing Yin ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Controlled Release ◽  
Drug Release ◽  
Polylactic Acid ◽  
Release Rate ◽  
Drug Carrier ◽  
Antibacterial Drug ◽  
Molecular Weights ◽  
Zero Order Release

Abstract A biodegradable local drug release system consisting of poly(sebacic anhydride) and polylactic acid was developed for the purpose of osteomyelitis therapy. Five kinds of poly(sebacic anhydride) with different molecular weights were synthesized, and levofloxacin was chosen as a model antibacterial drug in the in vitro release within 38 days. As the molecular weight of poly(sebacic anhydride) increased, the melting point (Tm) of the matrices increased and the surface morphology became smoother. Consequently, the initial burst effect was reduced and the release rate significantly decreased. In addition, the kinetics of pills containing poly(sebacic anhydride) (Mw=13,000) were close to zero order release. The release profile reveals that the thermodynamic properties and morphology of these matrices, which are affected by the molecular weight, are essential for developing controllable delivery systems. The drug release rate could be easily controlled by the molecular weight of the poly(sebacic anhydride). Finally, these prospective results allow the biodegradable controlled release systems to be employed as carriers for the treatment of chronic osteomyelitis, as well as for other medical applications.

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