Hypochlorous Acid Dry Eye Formulations With Buffered Stability
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Solution Overview
Problem
Hypochlorous acid, a gentle yet effective preservative, is incompatible with most demulcents and degrades rapidly in solution, limiting its use in over-the-counter dry eye formulations, leading to potential side effects from alternative preservatives.
Innovation Solution
A dry eye composition comprising 50 to 350 ppm of hypochlorous acid, polyvinylpyrrolidone as a primary demulcent, and an aqueous vehicle with specific osmolality and pH, along with optional secondary demulcents, stabilizes hypochlorous acid and provides antimicrobial protection without irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hypochlorous acid is used as a preservative in dry eye formulations, then antimicrobial protection is improved, but stability deteriorates due to rapid degradation when paired with demulcents
Solution Approach 1:
The patent introduces a buffer system (phosphate, citrate, or acetate buffer at pH 3.5-6.5) as an intermediary component that mediates between hypochlorous acid and demulcents. The buffer maintains optimal pH conditions that stabilize hypochlorous acid while allowing demulcents to function, thereby resolving the incompatibility issue and enabling long-term stability without sacrificing antimicrobial efficacy
Solution Approach 2:
The patent optimizes the concentration of hypochlorous acid to a specific range (50-350 ppm) and controls pH within 3.5-6.5 through buffering agents. By adjusting these critical parameters, the formulation achieves both stability and antimicrobial protection, transforming an unstable combination into a stable, effective dry eye formulation
2Stability of the object's composition
If alternative preservatives are used instead of hypochlorous acid, then stability is improved, but harmful factors increase due to potential irritation and inflammation
Solution Approach 1:
The patent employs hypochlorous acid at low concentrations (50-350 ppm) as a gentle, short-acting preservative that provides adequate protection without the cumulative irritation associated with traditional preservatives. The low dosage and buffered formulation allow for safe, prolonged use while maintaining ocular comfort
Solution Approach 2:
By controlling pH within the physiological range (3.5-6.5) and using buffered formulations, the patent reduces the irritating effects of hypochlorous acid while maintaining its preservative efficacy. This parameter optimization eliminates the harmful side effects associated with alternative preservatives
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively lubricates and protects the eye surface, preventing bacterial growth while maintaining stability and safety for long-term use, reducing discomfort and potential eye damage.
Implementation Method 1
Hypochlorous acid is a gentle yet highly effective preservative that can be safely applied to the ocular area
Implementation Method 2
These eye drops primarily contain compounds known as demulcents, which create a protective film over the eye's surface, slowing the evaporation of the existing tear film
Implementation Method 3
The pH of the composition is adjusted with the inorganic and organic buffers to be in the range of 3.5 to about 6.5
Implementation Method 4
the osmolality of the dry eye composition is in the range of 80 to about 320 mOsm/kg
Data Source
AI summary
A dry eye composition containing hypochlorous acid and a demulcent. The demulcent can be polyvinylpyrrolidoe with a molecular weight of 30-50 kDa. The composition can be applied to the surface of the eye with a dropper device or a spray dispenser. Critically, hypochlorous acid is stable in the dry eye composition and maintains its effectiveness at preventing microbial growth.