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Medical journals
Density of Lyophilised Ophthalmic Lamellae
Hustota lyofilizovaných očních lamel
Je sledován vliv koncentrace hydroxypropylmetylcelulózy (HPMC 4000) 20–60 g/l v hydrogelu na hustotu lyofilizovaného xerogelu. Z lyofilizovaných fólií byly ražením získány lamely o průměru 5,5 mm a odhadnuta jejich hustota. S poklesem koncentrace HPMC 4000 v hydrogelu klesá hustota lamel na hodnoty v rozmezí 50–55 g/l. Jsou diskutovány příčiny tohoto jevu a jeho důsledky pro optimalizaci technologie lyofilizovaných očních lamel.
Klíčová slova:
hydroxypropylmetylcelulóza – hydrogel – lyofilizace – hustota xerogelu
Authors: Z. Zatloukal
Authors‘ workplace: Katedra farmaceutické technologie Farmaceutické fakulty Univerzity Karlovy, Hradec Králové
Published in: Čes. slov. Farm., 1998; , 276-278
Category:
Overview
The present paper examines the effect of the concentration of hydroxypropylmethylcellulose (HPMC 4000) 20–60 g/l in hydrogel on the density of lyophilised xerogel. Lamellae of a diameter of 5.5 mm were obtained by stamping from lyophilised foils and their density was estimated. With decreasing HPMC 4000 concentration in hydrogel, the density of lamellae decreases to values within 50–55 g/l. The causes of this phenomenon and its consequences for optimisation of technology of lyophilised ophthalmic lamellae are discussed.
Key words:
hydroxypropylmethylcellulose – hydrogel – lyophilisation – xerogel density
Labels
Pharmacy Clinical pharmacology
Article was published inCzech and Slovak Pharmacy
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