Studies on improved corneal permeability to bunazosin.

Area of Science:

• Ophthalmology
• Pharmaceutics
• Corneal Physiology

Background:

• Corneal permeability is crucial for topical drug delivery.
• Understanding factors influencing drug penetration is essential for effective ophthalmic formulations.
• Bunazosin is a drug candidate requiring optimized corneal delivery.

Purpose of the Study:

• To investigate factors affecting corneal permeability to bunazosin.
• To elucidate the role of caprylic acid in enhancing bunazosin corneal penetration.
• To determine the mechanism by which caprylic acid influences bunazosin permeability.

Main Methods:

• In vitro assessment of corneal permeability using bunazosin.
• Investigation of pH effects on corneal permeability.
• Evaluation of caprylic acid and capric acid effects on permeability and partition.
• Analysis of protein-bunazosin interactions.

Main Results:

• Corneal permeability to bunazosin increased with pH.
• Caprylic acid significantly enhanced bunazosin permeability and partition, with maximal effect at a 1:1 molar ratio.
• Caprylic acid did not affect the permeability of non-ionic compounds like methylparaben.
• Corneal pretreatment with caprylic acid did not alter permeability.
• Protein-bunazosin interaction remained unaffected by caprylic acid.

Conclusions:

• The enhancement of corneal permeability to bunazosin by caprylic acid is primarily due to increased partition into the corneal membrane.
• The mechanism is specific to bunazosin and not a general effect on corneal tissue or non-ionic molecules.
• pH is a significant factor influencing bunazosin corneal permeability.