What are polymeric microparticles?

Polymeric microparticles are usually formed by a polymer matrix in which a smaller amount of an active compound can be immobilized. With respect to the distribution of the active compound, two different categories of microparticles can be distinguished: “microspheres” and “microcapsules” (Fig. 1).

Which polymer is used in drug delivery?

Among the synthetic and biodegradable polymers, aliphatic polyesters such as poly (glycolic acid), poly (lactic acid), poly (caprolactone) and polydioxanone, are most commonly used and applied to drug delivery systems.

What is microparticles in pharmacy?

Microparticles are successful delivery systems that encapsulate both water-insoluble and sparingly water-soluble agents to elicit their efficacy with a great potential attributed to their unique properties: particle size, shape, structure, drug loading, entrapment efficiency, porosity, and release profile.

Why are microparticles used in large molecule formulations?

Microparticle-based formulations can increase the stability of drugs, enzymes to be delivered and released in a sustained manner at the target site (deeper layers of lungs).

What is the main advantage of polymer in polymeric nanoparticle?

Most important advantages offered by the polymeric nanoparticles include the following: (1) provide controlled release to the desired site, (2) provide stability to labile molecules (e.g., proteins), and (3) provide ability to modify surfaces with ligands for stealth and targeted drug delivery purposes [30].

How do you make polymeric nanoparticles?

However, there are various methods used for the preparation of polymeric nanoparticles such as desolvation, dialysis, ionic gelation, nanoprecipitation, solvent evaporation, salting out, spray drying and supercritical fluid.

How are polymers used in drug delivery system?

Polymers have played an integral role in the advancement of drug delivery technology by providing controlled release of therapeutic agents in constant doses over long periods, cyclic dosage, and tunable release of both hydrophilic and hydrophobic drugs.

What is a benefit of using polymers for drug delivery?

There are several advantages of polymer acting as an inert carrier to which a drug can be conjugated, for example, the polymer improves the pharmacokinetic and pharmacodynamic properties of biopharmaceuticals through various ways, such as, increases the plasma half-life, decreases the immmunogenicity, boost stability …

What is the difference between nanoparticles and microparticles?

Nanoparticles are polymeric particles in the nanometer size range whereas microparticles are particles in the micrometre size range. These particles have been shown to enhance the delivery of certain drugs across a number of natural and artificial membranes.

What are microparticles made of?

Microparticles (MP) are small (less than 1 micrometer, about the size of a bacterium) phospholipid vesicles that are shed from a variety of cell types including platelets, leukocytes, and endothelial cells.

What are polymer nanocomposites used for?

Abstract Polymer nanocomposites (PNC) have attracted significant research and industrial interests due to their promising potential for versatile applications ranging from packaging, remediation, energy storage, electromagnetic (EM) absorption, sensing and actuation, transportation and safety, defense systems, thermal …

What system is used by nanotechnology for drug delivery?

Nano-carrier system (NCS) encapsulates or adsorbs a drug, a therapeutic foreign gene molecule on its surface, and also couples a specific targeting molecule to the surface of the nano-carrier and then binds to a cell surface-specific receptor through a targeting molecule.

Are microparticles a promising approach for controlled and site specific drug delivery?

Thus, microparticles are found to be a promising approach for controlled and site specific drug delivery, which minimize dosage frequency and improve patient compliance. 1.1. Signs and symptoms of ulcerative colitis

What is microparticulate system?

Among all, microparticulate system is one of the best approaches for controlled drug delivery in specific site of inflammation. Microparticles are small free flowing particles consisting of natural or synthetic polymers having particle diameter ranging from 1 to 1000 μm.

What are the particulate carrier systems used for targeted drug delivery to colon?

There is wide range of particulate carrier system used for targeted drug delivery to colon, which mainly includes microparticles, microcapsules, nanoparticles, nanocapsules to overcome the disadvantages of conventional drug delivery systems like increased risk of systemic adverse drug reactions.

What are the different approaches to colonic drug delivery?

There are different approaches which have been studied over the last decade, including prodrugs, polymeric approach, time released system, pH sensitive system, which show the site specific drug delivery to colon.