What are Thermoreversible gels?
Thermoreversible gels are formed from a solution of a biopolymer or a synthetic polymer by a change of tem- perature. If the temperature change is reversed the gel changes its state back to that of the solution (sol).
What polymers are 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.
Which polymer is mostly used in pharmaceutical formulation?
The most common carriers for polymer therapeutics are HPMA (polymer-drug) and PEG (polymer-protein), but other systems studied include poly(glutamic acid), PEI, dextran, dextrin, chitosans, poly(l-lysine), and poly(aspartamides) as polymeric carriers (92).
What type of polymer would you use to attach a hydrophobic drug?
hydrogels
PEG-based polymers have been widely used to prepare covalently crosslinked hydrogels with hydrophobic domains.
What is the example of gel?
Some of the examples of gels are curd, cheese, butter, etc. Emulsion: These are the type of colloidal solution in which both the dispersed phase and the dispersed medium are in their liquid state. Some of the examples of emulsion are milk, cold cream, oil in water, etc.
Why are polymers used in medicine?
Polymers used for vascular prostheses or good blood flow include poly (ethylene terephthalate) fibers, expanded polytetrafluoroethylene foams, segmented porous polyurethanes, and microporous silicone rubber. Polymers are also used to oxygenate blood and should be made sure that they operate without blood damage.
What are polymers in pharmacy?
Pharmaceutical Polymers are the heart of Pharmaceutical formulations either in conventional and novel drug delivery system. The drug release is sustaining, extending, modifying, controlling and targeting based on the use of polymer in different dosage forms and drug delivery system.
Why are polymers used in pharmaceutical industry?
What are some hydrophobic materials?
Hydrophobic materials in biology are substances that do not dissolve in water, repel water, or are themselves repelled by water molecules. Examples include greases, waxes, steroids, alkanes, and fats.
What are examples of lipophilic drugs?
Pharmacokinetics – Part 2: Lipophilic and Hydrophilic drugs – YouTube
What is polymer gel used for?
To date, these gels have been proposed as various applications including soft actuators (artificial muscle), drug delivery systems, purification or separation systems, regenerative medicine, biosensors, shape memory materials, molecular recognition systems, etc.
What are the types of gels?
Gel types
- Chromium (III)-carboxylate/acrylamide-polymer gels.
- Chromium (VI) redox gels.
- Aluminum crosslinked gels.
- Gels crosslinked with an organic crosslinker.
- Biopolymer gels.
- Monomer gels.
- Polymer self-induced gels.
- Inorganic gels.
Which polymer is popularly used in cosmetic surgeries?
The plastics most widely used in surgical implants are polytetrafluoroethylene, polypropylene, saturated aromatic polyesters, and polysiloxanes.
What are some uses of polymers?
Polymers are used in almost every area of modern living. Grocery bags, soda and water bottles, textile fibers, phones, computers, food packaging, auto parts, and toys all contain polymers. Even more-sophisticated technology uses polymers.
How are polymers used in pharmaceuticals?
In the pharmaceutical industry, polymers are used to improve and control the delivery of medications, coating materials, binders, drug carriers, protective agents, and taste masking agents (Shinde et al., 2017).
What are applications and uses of polymers?
Clothing, floor coverings, garbage disposal bags, and packaging are other polymer applications. Automobile parts, windshields for fighter planes, pipes, tanks, packing materials, insulation, wood substitutes, adhesives, matrix for composites, and elastomers are all polymer applications used in the industrial market.
What is the most hydrophobic material?
The level of hydrophobicity is determined by the contact angle made between a liquid-vapour surface and a solid surface. This is denoted as ϴY in the image below. One of the most hydrophobic surfaces in everyday use is Teflon.
What is super hydrophobic material?
Ultrahydrophobic (or superhydrophobic) surfaces are highly hydrophobic, i.e., extremely difficult to wet. The contact angles of a water droplet on an ultrahydrophobic material exceed 150°. This is also referred to as the lotus effect, after the superhydrophobic leaves of the lotus plant.
What are lipophilic substances?
Definition: Lipophilic or ‘lipid-loving’ molecules are attracted to lipids. A substance is lipophilic if it is able to dissolve much more easily in lipid (a class of oily organic compounds) than in water. Source: GreenFacts.
Is aspirin lipophilic or hydrophilic?
Aspirin and salicylic acid are hydrophobic compounds.
How many types of polymer gel are there?
Polymer gels can be classified into two types: chemical and physical gels. Chemical gels are covalently crosslinked network polymers swollen in a large amount of solvent and are generally thermally irreversible.
What is Carbopol gel?
Carbopol® (Carbomer)
In the cosmetic industry, Carbopol is used as a thickener in lotions, creams and gels. It is also used to stabilize, suspend, and control the release of pharmaceutical products. At low concentrations, suspensions flow easily with a slippery feel.
What are the five kinds of gels?
How polymers are used in surgery?
High polymers are used in medicine, surgery, or artificial organs in three ways: 1) to construct complete artificial replacements for human organs, 2) to repair, sustain, or augment function of normal organs, and 3) to provide a biochemical function.
Which material is used in plastic surgery?
Plastic surgery gets its name from the Greek word ‘plastikos’ meaning malleable or mouldable and not because it involves the use of plastic. The materials that are used as implants during plastic surgery are silicone, Gore-Tex and Medpor with silicone being the most common.