What are mucoadhesive polymers?
Mucoadhesive polymers are water-soluble and water insoluble polymers. Mucoadhesive polymers that adhere to the mucin-epithelial surface can be conveniently divided into three broad classes: • Polymers that become sticky when placed in water and owe their mucoadhesion to stickiness.
Is span 80 used as mucoadhesive polymer?
Span 80 was found to have a significant influence on the percentage of mucoadhesion observed (i.e. percentage of microspheres adhered and remained on the gastric mucous layer), particles size and drug entrapment efficiency.
What is mucoadhesive property?
Molecules that can present mucoadhesive properties are molecules with hydrogen bond building groups, high molecular weight, flexible chains, and surface active properties. It is perceived that increase in adhesion force is associated with the degree of penetration of polymer chains.
Is HPMC natural mucoadhesive polymer?
The possible explanation for this observation is that the mucoadhesive polymer (HPMC) used in preparing nanoparticles helps in adhering them due to their inherent chemical nature. Being a hydrophilic polymer, HPMC provides rapid swelling of the nanoparticles, which also contributes to higher mucoadhesion.
Which substance is used as mucoadhesive?
PAA and NaCMC possess excellent mucoadhesive characteristics due to the formation of strong hydrogen bonding interactions with mucin. Polycarbophil (Noveon) and Carbomers (Carbopol), PAA derivatives have been studied extensively as mucoadhesive platforms for drug delivery to the GI tract.
What is the example of natural mucoadhesive polymer?
They are biocompatible without any side effect, Various Natural polymers for example Guar gum, Okara gum, Locust bean gum, Pectin, Amylose, Chitosan, Alginate, Xanthan gum, are used in various pharmaceutical formulations.
Is used as mucoadhesive polymer?
The mucoadhesive polymers used for the ocular delivery include thiolated poly(acrylic acid), poloxamer, celluloseacetoph- thalate, methyl cellulose, hydroxy ethyl cellulose, poly(amidoamine) dendrimers, poly(dimethyl siloxane) and poly(vinyl pyrrolidone) [55–57].
Which one of the following is example of natural mucoadhesive polymer?
Various natural polymers which can be used in mucoadhesive buccal films are chitosan, sodium alginate, tragacanth, gelatin and guar gum etc.
What is mucoadhesive gel?
Semisolid mucoadhesive dosage forms, such as gels (or ointments), that represent excellent formulations for several routes of administration, such as topical, vaginal and rectal, may therefore be considered efficient as drug delivery systems in the buccal cavity, covered by a mucus layer: mucoadhesive gels are easily …
What is hydroxyl methylcellulose?
Hydroxypropyl methylcellulose (HPMC) belongs to the group of cellulose ethers in which hydroxyl groups have been substituted with one or more of the three hydroxyl groups present in the cellulose ring (Fig. HPMC is also soluble in polar organic solvents, making it possible to use both aqueous and nonaqueous solvents.
Which of the substance is used as mucoadhesive?
Anionic polymers are the most widely employed mucoadhesive polymers within pharmaceutical formulation due to their high mucoadhesive functionality and low toxicity. Typical examples include poly (acrylic acid) (PAA) and its weakly cross-linked derivatives and sodium carboxymethylcellulose (NaCMC).
Mucoadhesive polymers. Mucoadhesive polymers should present some characteristics which facilitate the interactions with mucins. First, polymers should present suitable chain flexibility at the pH and ionic strength of the mucus.
What is mucoadhesion and how is it formed?
Mucoadhesion is the result of multiple steps of interaction between a mucoadhesive polymer and mucins. Even though several theories were developed to comprehensively explain this phenomenon [8], [9], it is preferable to divide the process of mucoadhesive bond formation in two main events [7].
What is polypoly(acrylic acid) (PAA) mucoadhesive?
Poly(acrylic acid) (PAA) possesses excellent mucoadhesive characteristics due to the ability of the carboxylic groups to form strong hydrogen bonds with the oligosaccharide chains of mucin. The physical entanglement between the polymer and mucus layers also plays an important role in promoting mucoadhesion.
What are the mechanisms of mucoadhesion between polymers and mucin?
Various mechanisms of mucoadhesion or bioadhesion between polymer and mucin such as H bonding, electrostatic interactions, di-sulfide linkage, van Der Waals attraction etc have been evidenced. Researches are focused to enrich such interaction between the mucous layer and the delivery platform by modifying the system.
