Enhancing Stability in Biological Fluids: The Role of Ion-Induced Water Structuring in Artificial Tears

Area of Science:

• Ophthalmology
• Biophysics
• Materials Science

Background:

• Biological fluid stability is crucial for physiological function; compromised tear stability can cause vision impairment and dry eye disease (DED).
• Artificial tears (ATs) are a common treatment for DED, but their molecular stabilization mechanisms are not fully understood.

Purpose of the Study:

• To investigate how electrolyte ions in ATs affect water structure and influence ATs film stability.
• To elucidate the molecular mechanisms underlying ATs' efficacy in stabilizing the tear film.

Main Methods:

• In situ observation of evaporation thermodynamics and hydration states.
• Analysis of the impact of specific ions (e.g., magnesium) and anions on water structure and stability.
• In vivo experiments to assess the therapeutic effects in dry eye conditions.

Main Results:

• Anions induce ordered, strong hydration, significantly enhancing ATs film stability.
• Magnesium ions alter water molecule arrangements, affecting evaporation and overall stability.
• In vivo studies confirm that strong hydration anion buffers effectively reduce dryness and inflammation in DED.

Conclusions:

• Electrolyte ions, particularly anions, play a key role in stabilizing artificial tears by structuring water molecules.
• Understanding these molecular interactions enables personalized DED treatments and broader applications in biological fluid stabilization.