Trometamol Stabilization of Thermally Unstable Eye Drops
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Solution Overview
Problem
Thermally unstable medicaments in eye drops, such as tafluprost and isopropropyl unoprostone, degrade when storage temperatures rise, leading to reduced drug efficacy and potential turbidity or suspended matter, and existing methods do not effectively prevent this degradation outside of cold storage.
Innovation Solution
Adding trometamol to the eye drop, adjusting the pH to a range of 4 to 8, effectively stabilizes tafluprost or isopropyl unoprostone by preventing thermal hydrolysis of the ester bond, using a water-soluble organic amine with a hydroxy group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the storage temperature is increased during distribution or storage, then the ease of operation is improved, but the stability of the medicament composition deteriorates due to thermal degradation
Solution Approach 1:
Trometamol acts as an intermediary substance that mediates between the thermally unstable medicament and the thermal environment. It forms a protective interaction with the medicament (particularly with ester bonds) to prevent thermal hydrolysis and degradation, allowing the eye drop to be stored at higher temperatures without compromising medicament stability.
Solution Approach 2:
The invention changes the chemical environment parameters of the eye drop formulation by introducing trometamol, which alters the pH and chemical reactivity parameters. This creates a more stable chemical environment that resists thermal degradation, enabling storage at temperatures above refrigeration conditions while maintaining medicament integrity.
2Stability of the object's composition
If cold storage is used to prevent medicament degradation, then the stability of the medicament composition is improved, but the ease of operation deteriorates due to storage restrictions
Solution Approach 1:
The invention replaces the need for expensive and restrictive cold chain storage infrastructure with a simple chemical stabilizer (trometamol) that can be incorporated into the formulation itself. This eliminates the need for continuous refrigeration, making the product accessible in settings without cold storage capabilities.
Solution Approach 2:
The eye drop formulation becomes self-stabilizing through the inclusion of trometamol, which provides intrinsic protection against thermal degradation. The formulation protects itself without requiring external cold storage conditions, enabling autonomous stability maintenance across various storage environments.
3Ease of operation
If water-soluble organic amine is added as a buffer, then the ease of operation is improved, but the stability of the medicament composition may deteriorate due to unwanted side effects
Solution Approach 1:
The invention applies the buffering function locally to where it is most needed - in the immediate chemical environment of the thermally unstable medicament. Trometamol is positioned to specifically protect the medicament from thermal hydrolysis through localized chemical interaction, rather than providing general bulk buffering.
Solution Approach 2:
The invention optimizes the pH parameter within a specific range (4-8) to achieve maximum stabilizing effect while minimizing unwanted side effects. This parameter optimization ensures that the organic amine provides thermal protection without causing precipitation, turbidity, or other adverse reactions.
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 method significantly reduces the degradation of tafluprost or isopropyl unoprostone, as demonstrated by a heat stability test showing higher residual ratios compared to traditional buffer systems, ensuring a stable eye drop composition even at elevated temperatures.
Implementation Method 1
the thermally unstable medicament has an ester bond and a tendency to be thermally hydrolyzed
Implementation Method 2
adjusting the pH of the eye drop in the range of from 4 to 8
Data Source
AI summary
The present invention provides a method for preventing the degradation of a thermally unstable medicament in an eye drop containing the medicament thereby to stabilize the eye drop. By adding an organic amine to an eye drop containing a thermally unstable medicament, the degradation of the medicament in the eye drop can be effectively prevented, and therefore the eye drop can be stably stored.