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Updated: Mar 25, 2026

Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
Published on: August 28, 2015
Polyester-based microparticles of different hydrophobicity: the patterns of lipophilic drug entrapment and release
Viktor Korzhikov1, Ilia Averianov2, Evgeniia Litvinchuk2
1a Institute of Chemistry , Saint-Petersburg State University , St. Petersburg , Russia ;
Abstract:
The paper is devoted to the investigation of the effect of polyester hydrophobicity and ability for crystallisation on lipophilic drug loading and release from microparticles fabricated on the base of these polymers. Poly(l-lactic acid), poly(d, l-lactic acid) and poly (lactic acid-co-glycolic acid) were synthesised by ring-opening polymerisation using stannous octoate as catalyst, while poly(caprolactone) (PCL) and poly(ω-pentadecalactone) (PPDL) formation was catalysed by lipase. The particles were formed via single emulsion evaporation/diffusion method. The particles obtained were studied using SEM, XRD and DSC methods. The degradation of particles based on different polyesters, entrapment and release of a model hydrophobic drug (risperidone®) were thoroughly studied. The effect of particles hydrophobicity and crystallinity on these parameters was of most interest. The drug entrapment is greater for the hydrophobic polymers. Drug release was more rapid from crystalline particles (PLLA, PCL, PPDL), than from amorphous PDLLA and PLGA ones.
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