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- W1507833081 abstract "Objectives The objectives of this study were to develop an intranasal insulin gel using Carbopol homogenization rather than neutralization and to examine the effectiveness of the gel compared with a subcutaneous injection. Methods Four factors, namely the molecular weight of polyethylene glycol (PEG), the concentration of Carbopol, the temperature of preparation and the type of absorption enhancer, were evaluated for their effect on viscosity and in-vitro insulin release. Bioavailability of insulin from selected formulations was compared with an intranasal solution and subcutaneous injection in rabbits. Key findings Increasing the molecular weight of PEG and Carbopol concentration increased the gel viscosity and changed the release mechanism from diffusion to case II transport. Applying heat during preparation resulted in a lower viscosity gel and increased the in-vitro insulin release. Among the two enhancers studied, sodium deoxycholate resulted in a higher viscosity gel than Tween 80. In vivo, the intranasal gel showed a stronger and longer hypoglycaemic effect with 1.7- and 3.1-fold higher maximum decrease in blood glucose level and area above the curve, respectively, compared with the subcutaneous injection. Conclusions The homogenized Carbopol intranasal gel could be an efficient noninvasive way for insulin delivery but selection of gel components and method of preparation are critical for achieving the most desired effect." @default.
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- W1507833081 date "2010-06-29" @default.
- W1507833081 modified "2023-10-16" @default.
- W1507833081 title "Enhancement of the intranasal delivery of insulin via a novel mucoadhesive Carbopol gel" @default.
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- W1507833081 doi "https://doi.org/10.1211/jpp.62.07.0007" @default.
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