Development of a physiologically relevant dripping analytical method using simulated nasal mucus for nasal spray...

Area of Science:

• Pharmaceutical Sciences
• Biomedical Engineering

Background:

• Current nasal spray formulation testing lacks physiological relevance, particularly regarding mucus interactions.
• Existing methods do not account for variations in nasal mucus due to disease states.

Purpose of the Study:

• To investigate the impact of nasal mucus on nasal spray formulation dripping behavior.
• To develop an improved, physiologically relevant in vitro analytical method for characterizing nasal spray dripping.

Main Methods:

• Developed an in vitro test method using simulated nasal mucus (healthy and diseased states) on a C18 Thin Layer Chromatography (TLC) substrate.
• Evaluated factors including mucus amount, application, drying times, and formulation compatibility.
• Assessed dripping behavior of nasal formulations (1-3.5% Avicel) actuated onto coated TLC plates, measuring drip after vertical repositioning.

Main Results:

• The developed method generated reproducible results for nasal formulation dripping behavior.
• Provided critical data on formulation compatibility with nasal mucus across different disease states.
• Demonstrated the influence of mucus viscosity and type on formulation performance.

Conclusions:

• The new in vitro method offers enhanced physiological relevance for nasal spray characterization.
• Aids in optimizing nasal spray formulation development by considering mucus interactions.
• Facilitates better physical characterization of nasal sprays for diverse patient populations.