The drug release from doxorubicin (DXR)-gelatin nanoparticle conjugates was evaluated by means of a dynamic dialysis technique. The study was carried out in absence and in presence of a proteolytic enzyme (trypsin) able to degrade the carrier. In a preliminary study the apparent permeability constant (K-cv) of the drug through the dialysis bag was evaluated in several media. On the basis of this screening, a saline solution (NaCl 0.9%, w/v) resulted appropriate to carry out the dialysis study since, in this medium, the K-cv did not depend on the drug concentration in the donor solution. In absence of the enzyme only a little fraction (from 9 to 13%, w/w of the drug content) was released from nanoparticles. This fraction was considered as the evidence of the free drug fraction. After the addition of trypsin, the diffusion of a further drug fraction was observed. This fraction is probably due to a fraction of the DXR-peptide conjugates characterised by a molecular weight lower than membrane cut-off (3500 Da). (C) 1999 Elsevier Science B.V. All rights reserved.
|Anno di pubblicazione:||1999|
|Titolo:||Dynamic dialysis for the drug release evaluation from doxorubicin-gelatin nanoparticle conjugates|
|Autore/i:||E. Leo; R. Cameroni; F. Forni|
|Codice identificativo ISI:||WOS:000079645800003|
|Codice identificativo Scopus:||2-s2.0-0032998057|
|Tipologia||Articolo su rivista|
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