scholarly journals Investigations on the Physical Structure and the Mechanism of Drug Release from an Enteric Matrix Microspheres with a Near-Zero-Order Release Kinetics Using SEM and Quantitative FTIR

2009 ◽  
Vol 10 (2) ◽  
pp. 615-623 ◽  
Author(s):  
Wasfy M. Obeidat ◽  
Safwan M. Obeidat ◽  
Nizar M. Alzoubi
Pharmaceutics ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 665 ◽  
Author(s):  
Christopher Janich ◽  
Andrea Friedmann ◽  
Juliana Martins de Souza e Silva ◽  
Cristine Santos de Oliveira ◽  
Ligia E. de Souza ◽  
...  

For parenteral controlled drug release, the desired zero order release profile with no lag time is often difficult to achieve. To overcome the undesired lag time of the current commercial risperidone controlled release formulation, we developed PLGA–lipid microcapsules (MCs) and PLGA–lipid microgels (MGs). The lipid phase was composed of middle chain triglycerides (MCT) or isopropylmyristate (IPM). Hydroxystearic acid was used as an oleogelator. The three-dimensional inner structure of Risperidone-loaded MCs and MGs was assessed by using the invasive method of electron microscopy with focused ion beam cutting (FIB-SEM) and the noninvasive method of high-resolution nanoscale X-ray computed tomography (nano-CT). FIB-SEM and nano-CT measurements revealed the presence of highly dispersed spherical structures around two micrometres in size. Drug release kinetics did strongly depend on the used lipid phase and the presence or absence of hydroxystearic acid. We achieved a nearly zero order release without a lag time over 60 days with the MC-MCT formulation. In conclusion, the developed lipid-PLGA microparticles are attractive alternatives to pure PLGA-based particles. The advantages include improved release profiles, which can be easily tuned by the lipid composition.


Biomaterials ◽  
2008 ◽  
Vol 29 (35) ◽  
pp. 4691-4697 ◽  
Author(s):  
Mohammad Hamdan Alkhraisat ◽  
Claus Moseke ◽  
Luis Blanco ◽  
Jake E. Barralet ◽  
Enrique Lopez-Carbacos ◽  
...  

Author(s):  
Roshan K Pawar ◽  
Kalaiselvan S ◽  
Balamurugan K

The intention of this current study is to intensify the bioavailability of drugs which have lower bioavailability (<20 %) like Lovastatin in the form of NLC carrier and also to optimize the formulation to select perfect variables for the formulation. The Nanostructures lipid carrier was formulated using Hot Homogenization technique with some optimization by utilizing 23 factorial design with the heal of response like in-vitro drug release, % Entrapment Efϑiciency (EE%), % drug Content (%DC), Zeta potential (Zp), Polydispersity Index (PI) and Particle Size (PS) for 12 hours. The kinetic studies of in-vitro drug release was performed and the parameters of the drug in different kinetic models like higuchi kinetic, zero order, ϑirst order, peppas models were evaluated. Invitro release kinetics studies show that optimized formulation NLC (N3) obeys Super Case II kinetics transport mechanism i.e., release of drug through reduction of attractive forces between Lipid chains and Zero order release kinetics for controlled drug delivery. Hence Nanostructure lipid carrier shows a good control and predetermined rate of drug release of Lovastatin. From the obtained outcome, N3 formulation was concluded as an optimized formulation with selected formulation variables like Solid Lipid: Liquid Lipid ratio (6:4), Span 80 as Surfactant (1%) and process variables like homogenization Speed as 5000 Rotations per minute for 15 mins.><20 %) like Lovastatin in the form of NLC carrier and also to optimize the formulation to select perfect variables for the formulation. The Nanostructures lipid carrier was formulated using Hot Homogenization technique with some optimization by utilizing 23 factorial design with the heal of response like in-vitro drug release, % Entrapment Efficiency (EE%), % drug Content (%DC), Zeta potential (Zp), Polydispersity Index (PI) and Particle Size (PS) for 12 hours. The kinetic studies of in-vitro drug release was performed and the parameters of the drug in different kinetic models like higuchi kinetic, zero order, first order, peppas models were evaluated. Invitro release kinetics studies show that optimized formulation NLC (N3) obeys Super Case II kinetics transport mechanism i.e., release of drug through reduction of attractive forces between Lipid chains and Zero order release kinetics for controlled drug delivery. Hence Nanostructure lipid carrier shows a good control and predetermined rate of drug release of Lovastatin. From the obtained outcome, N3 formulation was concluded as an optimized formulation with selected formulation variables like Solid Lipid: Liquid Lipid ratio (6:4), Span 80 as Surfactant (1%) and process variables like homogenization Speed as 5000 Rotations per minute for 15 mins.


2020 ◽  
Vol 18 (28) ◽  
pp. 5473-5480
Author(s):  
Yongfang Liao ◽  
Zizhen Ye ◽  
Meng Qian ◽  
Xing Wang ◽  
Yuda Guo ◽  
...  

Light-controlled NO hybrids with pseudo-zero-order release kinetics were developed based on the benzothienoazepine scaffold bearing cationic groups for antimicrobial applications.


Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1769 ◽  
Author(s):  
Fabrizio Fina ◽  
Alvaro Goyanes ◽  
Martin Rowland ◽  
Simon Gaisford ◽  
Abdul W. Basit

Zero-order release formulations are designed to release a drug at a constant rate over a prolonged time, thus reducing systemic side effects and improving patience adherence to the therapy. Such formulations are traditionally complex to manufacture, requiring multiple steps. In this work, fused deposition modeling (FDM) 3D printing was explored to prepare on-demand printlets (3D printed tablets). The design includes a prolonged release core surrounded by an insoluble shell able to provide zero-order release profiles. The effect of drug loading (10, 25, and 40% w/w paracetamol) on the mechanical and physical properties of the hot melt extruded filaments and 3D printed formulations was evaluated. Two different shell 3D designs (6 mm and 8 mm diameter apertures) together with three different core infills (100, 50, and 25%) were prepared. The formulations showed a range of zero-order release profiles spanning 16 to 48 h. The work has shown that with simple formulation design modifications, it is possible to print extended release formulations with tunable, zero-order release kinetics. Moreover, by using different infill percentages, the dose contained in the printlet can be infinitely adjusted, providing an additive manufacturing route for personalizing medicines to a patient.


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