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Aminated gelatin microspheres (AGMS) was investigated as a nasal drug delivery system for peptide drugs. The in vitro drug release from microspheres was evaluated using a fluorescein-labeled insulin (RITC-insulin) and FITC-dextran with a molecular weight of 4.4 kDa (FD-4) as model drugs. RITC-insulin release from AGMS was significantly slower than from native gelatin microspheres (GMS), with a cumulate...
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