Abstract
The oral cavity, in particular the buccal mucosa, can be profitably employed for the administration of drugs intended for either local or systemic action. Conventional dosage forms are not able to assure therapeutic drug levels in the oral mucosa and in the systemic circulation; to obtain therapeutic action, it is required to develop oral mucoadhesive dosage forms, capable of withstanding the physiological removal action due to saliva and mechanical stresses and to prolong and improve the contact between the active substance and the mucosa. To achieve this aim, formulations intended for oral mucosal administration should contain mucoadhesive polymers as enabling excipients.
Several classes of polymers have been shown to possess pronounced adhesion properties when placed in contact with the oral mucosa. Their hydrophilic properties together with the capability to spread over the mucosal surface represent the main requirements to develop an intimate and prolonged contact with the mucosa. Good swelling properties are also important to favour the interpenetration between polymer and mucin chains. Furthermore, the ionic (cationic and anionic) charge density contributes to the formation of weak chemical bonds. Following the application of a dry or partially hydrated polymer, its hydration and the consequent mucus dehydration cause an increase in mucus cohesive properties which, in turn, promotes mucoadhesion. In summary, hydration, swelling and cohesive as well as rheological properties of the polymers are closely linked to their mucoadhesive properties.
This chapter focuses on the assessment of the mucoadhesive properties of materials, and the selection thereof, as based on a number of tests capable of evaluating the interplay of the above mechanisms depending also on the type of formulation/dosage form. Among mucoadhesive polymers, particular attention is paid to chitosans and hyaluronans, which are also endowed with absorption enhancement properties through the oral mucosa.
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Sandri, G., Rossi, S., Ferrari, F., Bonferoni, M., Caramella, C. (2015). Mucoadhesive Polymers as Enabling Excipients for Oral Mucosal Drug Delivery. In: Rathbone, M., Senel, S., Pather, I. (eds) Oral Mucosal Drug Delivery and Therapy. Advances in Delivery Science and Technology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-7558-4_4
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