Fluorescein Benoxinate Composition Stability
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Solution Overview
Problem
Current compositions of fluorescein and benoxinate for ophthalmic use suffer from high impurity levels and degradation over time, affecting their stability and efficacy in diagnostic and therapeutic applications.
Innovation Solution
A composition comprising fluorescein and benoxinate with minimal impurities, where the total impurity is 1.5% or less by weight, and the benoxinate component remains stable for 12 months or more, with a preservative like chlorobutanol added to ensure ophthalmic suitability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compositions of fluorescein and benoxinate are used, then the composition can be prepared and stored, but the impurity levels are high and degradation occurs over time
Solution Approach 1:
The patent applies parameter changes by optimizing the pH of the composition to a specific range (pH 3.0-5.0) and controlling the concentration of preservatives (chlorobutanol at 0.1-0.5%). These parameter adjustments stabilize the fluorescein and benoxinate components, preventing degradation and minimizing impurity formation during storage, thereby resolving the contradiction between reliability and harmful impurities
Solution Approach 2:
The patent introduces chlorobutanol as an intermediary preservative agent that mediates between the active ingredients (fluorescein and benoxinate) and potential contaminants. This intermediary substance prevents microbial growth and chemical degradation without reacting adversely with the active components, thus maintaining low impurity levels while ensuring stability and efficacy over time
2Duration of action of stationary object
If the composition is stored for long periods, then it remains available for use, but degradation increases and purity decreases
Solution Approach 1:
The patent applies preliminary action by incorporating stabilizing measures during the composition formulation stage. The pH is adjusted to the optimal range (3.0-5.0) and preservatives are added before storage begins. This preliminary stabilization prevents degradation pathways from initiating, allowing the composition to maintain high purity throughout extended storage periods without significant degradation
Solution Approach 2:
The patent creates an inert chemical environment by controlling the pH and adding preservatives that inhibit chemical reactions and microbial activity. This inert environment protects the active ingredients from oxidation, hydrolysis, and other degradation processes, enabling long-term storage while maintaining manufacturing precision and purity levels
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 maintains high purity and stability of fluorescein and benoxinate, ensuring effective use in ophthalmic procedures and examinations with reduced degradation, thereby enhancing diagnostic accuracy and therapeutic outcomes.
Implementation Method 1
with a preservative like chlorobutanol added to ensure ophthalmic suitability
Implementation Method 2
Fluorescein, such as fluorescein sodium, is a dye that is widely used as a diagnostic tool in the field of ophthalmology and optometry
Data Source
AI summary
Compositions comprising a fluorescein component and benoxinate component and the corresponding uses of these compositions are described herein. These compositions have improved storage life and the fluorescein component and/or benoxinate component minimally degrade after 12 to 18 months of storage.