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Formulation and in vivo evaluation of Floating Microspheres of Misoprostal
Author(s) -
vanitha kondi,
Varma Mohan,
Alluri Ramesh
Publication year - 2012
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.26.1_supplement.848.7
Subject(s) - sodium bicarbonate , in vivo , ulcer index , oral administration , chemistry , ethanol , microsphere , pharmacology , chromatography , dosage form , stomach , gastric mucosa , medicine , biochemistry , microbiology and biotechnology , chemical engineering , engineering , biology
Prostaglandin (PG) has been reported to be an important protective and acid‐suppressive factor in the gastric mucosa. The objective of the study was to develop and evaluate a stomach specific drug delivery system for controlled release of Misoprostal a PE analogue for gastric ulcer induced NSAIDs. Floating microspheres were prepared by emulsification‐solvent evaporation method using ethylcellulose as a polymer, carbopol as mucoadhesive polymer. Ulcers were induced by the oral administration of absolute ethanol (5 ml/kg) to 24 h fasted Wistar male rats (n =8), weighing 200 g. Sodium bicarbonate solution, misoprostal solution and drug‐loaded microspheres were tested. Formulations were administered orally 1 h before the administration of ethanol. Prior to the oral administration, rats were anesthetized with ethylic ether. After 2 h of ethanol administration, animals were sacrificed; the stomachs were removed, opened along the greater curvature and examined for lesion measurements. Ulcer indexes (UI) were calculated. The in vivo evaluation showed that ulcer index values were 0.61 ± 0.14 for the sodium bicarbonate solution, 0.58 ±0.18 for the misoprostal and 0.11 ± .06 for the misoprostal‐loaded microspheres. The Kruskal‐Wallis test detected statistical differences (p =0.002) between the ulcer indexes. The multiple analyses (Student‐Newman‐Keuls) showed that the misoprostal loaded micro particles presented a gastric ulcer index statistically lower than the sodium bicarbonate solution (p = 0.001) and the misoprostal solution (p = 0.021). The percentages of ulceration inhibition were 31 and 75% after the administration of misoprostal solution and microspheres, respectively. In conclusion, the in vivo evaluation showed that the microspheres presented ulcer index lower than the solutions, showing that misoprostal‐loaded microparticles were efficient in protecting the stomach against ulcer formation.