In situ Gelling Polymers for Ophthalmic Drops
In situ gelující polymery pro oční kapky
Jednou z možností jak optimalizovat biodostupnost léčiv po topické oční aplikaci je prodloužení doby kontaktu přípravku s oční tkání. Nejobvyklejší cestou k dosažení tohoto cíle je zvýšení viskozity přípravku přídavkem vhodné pomocné látky. Kromě hydrogelů a mukoadhezivních látek jsou k tomuto účelu v současnosti využívány také polymery, které vykazují fázovou změnu „sol-gel“. K této tzv. gelaci in situ dochází ve velmi krátkém čase po kontaktu s oční tkání vlivem změny teploty, pH nebo interakcí s fyziologickými ionty. Tato práce je zaměřena na přehled in situ gelujících polymerních látek, které jsou studovány v souvislosti s využitím v oční aplikaci.
Klíčová slova:
oční kapky – gelace in situ – polymery – polysacharidy
Authors:
Z. Šklubalová
Authors‘ workplace:
Katedra farmaceutické technologie Farmaceutické fakulty Univerzity Karlovy, Hradec Králové
Published in:
Čes. slov. Farm., 2005; 54, 4-10
Category:
Review Articles
Overview
One of the possibilities of how to optimize bioavailability of drugs after topical ophthalmic administration is prolongation of the period of contact of the preparation with the eye tissue. The most usual way of achieving this gaol is an increase in the viscosity of the preparation by an addition of a suitable auxiliary substance. At present besides hydrogels and mucoadhesive substances, also polymers which produce the sol-gel phase change are employed for this purpose. This so-called in situ gelation takes place in a very short period of time after contact with the eye tissue due to a change in temperature, pH, or interaction with physiological ions. The present paper aims to survey in situ gelling polymeric substances, which are examined in relation to their use in ophthalmic administration.
Key words:
ophthalmic drops – gelation in situ – polymers – polysaccharides
Labels
Pharmacy Clinical pharmacologyArticle was published in
Czech and Slovak Pharmacy
2005 Issue 1
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