Development and characterization of biodegradable nanospheres as delivery systems of anti-ischemic adenosine derivatives.

Abstract:

:We report a preliminary study concerning the encapsulation modalities in nanoparticles of the anti-ischemic drug N6-cyclopentyladenosine (CPA) and its pro-drug 5'-octanoyl-CPA (Oct-CPA). The release of these compounds and the related pro-drug stability effects in human whole blood have been tested. Moreover, the influence of the delivery systems on CPA interaction toward human adenosine A1 receptor has been analysed. The nanospheres were prepared by nanoprecipitation or double emulsion solvent evaporation method using poly(lactic acid) and recovered by gel filtration or ultracentrifugation or dialysis. Free and encapsulated Oct-CPA was incubated in fresh blood and its stability was analysed with HPLC. Quite spherical nanoparticles with mean diameters ranging between 210+/-50 and 390+/-90 nm were obtained. No encapsulation occurred when CPA was used. Satisfactory results concerning drug content (0.1-1.1% w/w) and encapsulation efficiency (6-56%) were achieved when Oct-CPA was employed. The controlled release of the pro-drug was achieved, being released within a range of 1-4 h, or very slowly, depending on nanoparticle preparations. The hydrolysis rate of Oct-CPA in human whole blood appeared stabilized in human whole blood with modalities related to the release patterns. The presence of all nanoparticle preparations did not interfere with CPA interaction at its action site.

journal_name

Biomaterials

journal_title

Biomaterials

authors

Dalpiaz A,Leo E,Vitali F,Pavan B,Scatturin A,Bortolotti F,Manfredini S,Durini E,Forni F,Brina B,Vandelli MA

doi

10.1016/j.biomaterials.2004.04.033

keywords:

subject

Has Abstract

pub_date

2005-04-01 00:00:00

pages

1299-306

issue

11

eissn

0142-9612

issn

1878-5905

pii

S0142961204003783

journal_volume

26

pub_type

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