Abstract：
:In the present paper the interaction between lambda carrageenan, a natural sulphated polysaccharide, and diltiazem HCl, a Ca channel blocking agent, was studied. Dialysis equilibria were performed to quantify the binding capacity of lambda carrageenan for diltiazem. The relevance of the interaction to hydrophilic matrix systems was confirmed: a relationship was found between the binding capacity and the release profiles of matrix tablets containing a fixed amount of drug and different percentages of lambda carrageenan. Dialysis equilibria in buffered media showed that the interaction is quite insensitive to the pH of the medium (in the range 1.8-6.8), while it is reduced by increasing ionic strength; this behaviour is in line with the importance of ionic bonds in diltiazem-carrageenan interaction. On the basis of the calculated binding capacity, the complex was prepared, dried and milled. A preliminary characterization of the diltiazem-carrageenan complex in the solid state was effected by means of X-ray and DSC analysis. The amount of drug going into solution from the complex was not significantly affected by the pH of the medium (in the range 1.8-6.8), while it was increased by increasing ionic strength.
journal_name
Int J Pharmjournal_title
International journal of pharmaceuticsauthors
Bonferoni MC,Rossi S,Ferrari F,Bettinetti GP,Caramella Cdoi
10.1016/s0378-5173(00)00389-6keywords:
subject
Has Abstractpub_date
2000-05-10 00:00:00pages
207-16issue
2eissn
0378-5173issn
1873-3476pii
S0378517300003896journal_volume
200pub_type
杂志文章abstract：:The absorption enhancing effects of polyamidoamine (PAMAM) dendrimers with various concentrations and generations on the nasal absorption of fluorescein isothiocyanate-labeled dextran with an average molecular weight of 4400 (FD4) were initially studied in rats. PAMAM dendrimers with different generations improved the...
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pub_type： 临床试验,杂志文章,随机对照试验
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