Abstract:
PURPOSE:It was the purpose of this study to develop a new oral drug delivery system for low molecular weight heparin (LMWH) providing an improved bioavailability and a prolonged therapeutic effect. METHODS:The permeation enhancing polycarbophil-cysteine conjugate (PCP-Cys) used in this study displayed 111.4 +/- 6.4 microM thiol groups per gram polymer. Permeation studies on freshly excised intestinal mucosa were performed in Ussing chambers demonstrating a 2-fold improved uptake of heparin as a result of the addition of 0.5% (w/v) PCP-Cys and the permeation mediator glutathione (GSH). RESULTS:Tablets containing PCP-Cys, GSH, and 279 IU of LMWH showed a sustained drug release over 4 h. To guarantee the swelling of the polymeric carrier matrix in the small intestine tablets were enteric coated. They were orally given to rats. For tablets being based on the thiomer/GSH system an absolute bioavailability of 19.9 +/- 9.3% (means +/- SD; n = 5) vs. intravenous injection could be achieved. whereas tablets comprising unmodified PCP did not lead to a significant (p < 0.01) heparin concentration in plasma. The permeation enhancing effect and subsequently a therapeutic heparin level was maintained for 24 h after a single dose. CONCLUSIONS:Because of the strong and prolonged lasting permeation enhancing effect of the thiomer/GSH system, the oral bioavailability of LMWH could be significantly improved. This new delivery system represents therefore a promising tool for the oral administration of heparin.
journal_name
Pharm Resjournal_title
Pharmaceutical researchauthors
Kast CE,Guggi D,Langoth N,Bernkop-Schnürch Adoi
10.1023/a:1023803706746subject
Has Abstractpub_date
2003-06-01 00:00:00pages
931-6issue
6eissn
0724-8741issn
1573-904Xjournal_volume
20pub_type
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journal_title:Pharmaceutical research
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更新日期:2017-03-01 00:00:00
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更新日期:2002-06-01 00:00:00
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journal_title:Pharmaceutical research
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更新日期:2003-04-01 00:00:00
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更新日期:2015-05-01 00:00:00
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更新日期:2000-08-01 00:00:00