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Medical journals
Kinetics of Hydration of Lyophilised Xerogel of Hydroxypropylmethylcellulose
KINETIKA HYDRATACE LYOFILIZOVANÉHO XEROGELU HYDROXYPROPYLMETYLCELULÓZY
Pomocí hydrofilní filtrační membrány je odhadnuta rychlost hydratace lyofilizovanýchočních lamel odstupňované hustoty 50 až 56 g/l ve vodě nebo vodném roztoku chloridusodného. Při nevýznamném vlivu hustoty je nelineární průběh hydratace ovlivněn převážnědifuzním mechanizmem vnikání vody do xerogelu při zachování jeho tvaru v časovémintervalu do 20 minut. V čase 10 minut je rychlost hydratace 19,9 mm/minzpomalena v přítomnosti chloridu sodného na 15,3 mm/min. Topřispívá k objasnění rozdílné rychlosti uvolňování léčivých látek z očníchlamel srovnatelné hustoty.
Klíčová slova:
xerogel – hydroxypropylmetylcelulóza – hydratace – kinetika
Authors: Z. Zatloukal
Authors‘ workplace: Katedra farmaceutické technologie Farmaceutické fakulty Univerzity Karlovy, Hradec Králové
Published in: Čes. slov. Farm., 1999; , 15-17
Category:
Overview
The rate of hydration of lyophilised ophthalmic lamellae of graded density of 50 to 56g/l in water or an aqueous solution of sodium chloride was estimated by means of ahydrophilic filtration membrane. With insignificant effect of density, the non-linearcourse of hydration is affected mainly by the diffusion mechanism of penetration of waterinto xerogel while preserving its shape in a time interval of to 20 minutes. In a periodof 10 minutes the rate of hydration of 19.9 mm/min isdecelerated to 15.3 mm/min in the presence of sodium chloride.This contributes to the elucidation of different rates of the release of activeingredients from ophthalmic lamellae of comparable density.
Key words:
xerogel – hydroxypropylmethylcellulose – hydration – kinetics
Labels
Pharmacy Clinical pharmacology
Article was published inCzech and Slovak Pharmacy
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