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• W2016499224 abstract "Semisolid phospholipid dispersions of vesicular morphology, so-called vesicular phospholipid gels (VPGs), were prepared by high-pressure homogenisation and tested in vitro for their suitability as implantable sustained release system for the decapeptide cetrorelix, a potent LH-RH antagonist. The VPGs contained 300-500 mg/g egg phosphatidylcholine (E80) and 0.5-10 mg/g cetrorelix acetate (CXA). The in vitro release experiments showed a wide variability of the system in release, ranging from complete release within less than 24 h (0.5mg/g CXA; 400 mg/g E80) to a predicted 80% sustained release over 3 months (8.6 mg/g CXA; 280 mg/g E80). Erosion of the phospholipid matrix, i.e. release of phospholipid vesicles was found to be the main release mechanism, following zero order or first order kinetics depending on the composition of the VPG. CXA-concentration dependent drug-drug or drug-lipid interactions are assumed to be responsible for the change in release kinetics and the decrease of CXA release at high concentrations of the peptide. Multivariate analysis revealed that both lipid concentration and peptide concentration and also the interactions between the two factors are significant factors for the release rate of the peptide. In summary: based on the presented in vitro release data sustained release of therapeutically relevant CXA doses over up to 6 weeks appears feasible. VPGs are thus considered as a promising new approach for the sustained release of peptide hormones." @default.
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• W2016499224 date "2005-04-01" @default.
• W2016499224 modified "2023-10-14" @default.
• W2016499224 title "Development and in vitro evaluation of a liposome based implant formulation for the decapeptide cetrorelix" @default.
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• W2016499224 doi "https://doi.org/10.1016/j.ejpb.2004.10.005" @default.
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