Density of Lyophilised Ophthalmic Lamellae2. Use of the Correlogram of Xerogel Density
Authors:
Z. Zatloukal
Authors‘ workplace:
Katedra farmaceutické technologie Farmaceutické fakulty Univerzity Karlovy, Hradec Králové
Published in:
Čes. slov. Farm., 1999; , 72-74
Category:
Overview
The paper examines the vacillation of the density of the foil lyophilised from hydrogel containing40 g/l of hydroxypropylmethylcellulose (HPMC 4000). Lamellae of a diameter of 0.55 cm were formedto estimate the density of cm 2 of xerogel. In comparison with traditional regressive methods, theuse of a two-dimensional correlogram is recommended. The most important finding is the achieve-ment of random vacillation of density in a distance of ca 2 cm in connection with stamping lamellaefrom the lyophilised foil. The findings make it possible to optimise the procedure of pouring hydrogelfor lyophilisation with a subsequent decrease in density vacillation of lyophilised ophthalmiclamellae.
Key words:
lyophilisation – hydroxypropylmethylcellulose – xerogel – density – correlogram
Labels
Pharmacy Clinical pharmacologyArticle was published in
Czech and Slovak Pharmacy
1999 Issue 2
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