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Biopharmaceutical Characterisation Of Insulin And Recombinant Human Growth Hormone Loaded Lipid Submicron Particles Produced By Supercritical Gas Micro-atomisation.
S. Salmaso, Sara Bersani, N. Elvassore, A. Bertucco, P. Caliceti
Published 2009 · Chemistry, Medicine
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Homogeneous dispersions of insulin and recombinant human growth hormone (rh-GH) in tristearin/phosphatidylcholine/PEG mixtures (1.3:1.3:0.25:0.15 w/w ratio) were processed by supercritical carbon dioxide gas micro-atomisation to produce protein-loaded lipid particles. The process yielded spherical particles, with a 197+/-94 nm mean diameter, and the insulin and rh-GH recovery in the final product was 57+/-8% and 48+/-5%, respectively. In vitro, the proteins were slowly released for about 70-80 h according to a diffusive mechanism. In vivo, the insulin and glucose profiles in plasma obtained by subcutaneous administration of a dose of particles containing 2 microg insulin to diabetic mice overlapped that obtained with 2 microg of insulin in solution. Administration of a dose of particles containing 5 microg insulin resulted in faster and longer glycaemia reduction. Oral administration of 20 and 50 microg insulin equivalent particles produced a significant hypoglycaemic effect. The glucose levels decreased since 2h after administration, reaching about 50% and 70% glucose reduction in 1-2h with the lower and higher dose, respectively. As compared to subcutaneous administration, the relative pharmacological bioavailability obtained with 20 and 50 microg equivalent insulin particles was 7.7% and 6.7%, respectively. Daily subcutaneous administration of 40 microg of rh-GH-loaded particles to hypophysectomised rats induced similar body weight increase as 40 microg rh-GH in solution. The daily oral administration of 400 microg rh-GH equivalent particles elicited a slight body weight increase, which corresponded to a relative pharmacological bioavailability of 3.4% compared to subcutaneous administration.
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