What is the mechanism of drug release?
There are many mechanisms by which the drug release can be controlled in a system: dissolution, diffusion, osmosis, partitioning, swelling, erosion, and targeting. They are dependent on the particular application and may act simultaneously or at different stages of a process of delivery.
What are the characteristics of diffusion controlled release system?
What are the characteristics of Matrix diffusion-controlled release systems? Explanation: In this system, the drug is dispersed into an insoluble matrix of a rigid nonswellable hydrophobic material or swellable hydrophilic material. Materials such as insoluble plastic PVC and fatty acids are used as rigid matrix.
How does drug delivery work and describe in brief its mechanism?
Targeted drug delivery is a means of delivering a drug in a way that considerably enhances the concentration of that drug in particular parts of the body relative to others. The mechanism by which a drug is targeted can be broadly divided into two types; a) passive targeting, b) active targeting (Figure 2).
What is drug release kinetics?
“It is a process by which a drug leaves a drug product. & is subjected to ADME & eventually becoming. available for pharmacological action.” It involves the study of drug release rate, dissolution. /diffusion/erosion studies and the study of factors.
What is diffusion controlled drug release?
In diffusion controlled release systems, drugs are trapped in and released via diffusion through inert water-insoluble polymeric membranes (reservoir systems) or polymeric matrices (monolithic systems) [4, 7 – 9].
What is korsmeyer Peppas model?
Korsmeyer-Peppas was a simple model known as “Power law” describing drug release from a polymeric system. Korsmeyer-Peppas model (1) describe some release mechanisms simultaneously such as the diffusion of water into the matrix, swelling of the matrix and dissolution of the matrix [12].
What is Higuchi model in drug release?
Simplified Higuchi model describes the release of drugs from insoluble matrix as a square root of time dependent process based on Fickian diffusion Equation. Q = KH t1/ 2. The data obtained were plotted as cumulative percentage drug release versus square root of time.
What is fickian and non fickian diffusion?
The main difference between Fickian and Non Fickian Diffusion is the presence or absence of boundaries; there are no boundaries in Fickian diffusion whereas non Fickian diffusion has a sharp boundary separating the highly swollen region from a dry, glassy region.
What is drug release?
“Drug release” refers to the process in which drug solutes migrate from the initial position in the polymeric system to the polymer’s outer surface and then to the release medium [1].
What is drug release kinetic?
What’s the difference between first order and zero order elimination?
First order kinetics occur when a constant proportion of the drug is eliminated per unit time. Zero order: a constant amount of drug is eliminated per unit time.