Abstract
The aim of this study was to formulate salbutamol sulfate (SS), a model drug, as mucoadhesive in situ gelling inserts having a high potential as nasal drug delivery system bypassing the first-pass metabolism. In situ gelling inserts, each containing 1.4% SS and 2% gel-forming polymer, hydroxypropyl methylcellulose (HPMC), carboxymethylcellulose sodium (CMC Na), sodium alginate (AL), and chitosan (CH) were prepared. The inserts were investigated for their different physicochemical properties. The weight of inserts was 16–27 mg, drug content was 3.9–4.2 mg, thickness ranged between 15 and 28 μm and surface pH was 5–7. Cumulative drug released from the inserts exhibited extended release for more than 10 h following the decreasing order: CH > AL > CMC Na > HPMC. The drug release from CMC Na and AL inserts followed zero-order kinetics while HPMC and CH inserts exhibited non-Fickian diffusion mechanism. The inserts exhibited different water uptake (7–23%) with the smallest values for CH. Differential scanning calorimetry study pointed out possible interaction of SS and oppositely charged anionic polymers (CMC Na and AL). The mucoadhesive in situ gelling inserts exhibited satisfactory mucoadhesive and extended drug release characteristics. The inserts could be used for nasal delivery of SS over about 12 h; bypassing the hepatic first-pass metabolism without potential irritation.
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Farid, R.M., Etman, M.A., Nada, A.H. et al. Formulation and In Vitro Evaluation of Salbutamol Sulphate In Situ Gelling Nasal Inserts. AAPS PharmSciTech 14, 712–718 (2013). https://doi.org/10.1208/s12249-013-9956-y
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DOI: https://doi.org/10.1208/s12249-013-9956-y