Vecuronium Bromide Aqueous Formulation Stability
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Solution Overview
Problem
Current aqueous solutions of vecuronium bromide are not stable enough for long-term use, necessitating the production and fresh preparation of lyophilisates, which is complex and costly, especially in emergency settings like ambulances.
Innovation Solution
A stable aqueous solution of vecuronium bromide is achieved by using an amino acid with an isoelectric point greater than 7, such as arginine, combined with an acid like aspartic acid to adjust the pH to a range of 3 to 5, creating a stable and durable preparation that eliminates the need for lyophilisates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vecuronium bromide is formulated as an aqueous solution, then ease of administration is improved, but stability deteriorates rapidly (decomposes very quickly)
Solution Approach 1:
Amino acids with isoelectric point greater than 7 (arginine, lysine, or histidine) are introduced as intermediary substances that interact with vecuronium bromide to form stable complexes. These amino acids act as mediators between the drug and the aqueous environment, preventing decomposition while maintaining solubility and ease of administration.
Solution Approach 2:
The pH of the aqueous solution is adjusted to a specific range (3-5) using appropriate buffers or acids. This parameter change creates optimal conditions for the amino acid-drug interaction, maximizing stability while preserving the therapeutic efficacy and administrability of the solution.
2Stability of the object's composition
If lyophilisates are produced to improve stability, then stability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts and eliminates the need for lyophilization by introducing amino acids and pH adjustment directly into the aqueous formulation process. This removes the complex freeze-drying step while achieving comparable or superior stability through chemical stabilization mechanisms.
Solution Approach 2:
By changing the formulation parameters (adding amino acids with specific isoelectric points and adjusting pH to 3-5), the solution achieves long-term stability without requiring the phase transition and dehydration processes of lyophilization, thereby simplifying the manufacturing process.
3Stability of the object's composition
If lyophilisates are used to ensure stability, then stability is improved, but loss of time increases due to fresh preparation requirement
Solution Approach 1:
The amino acids and pH-adjusting agents are incorporated into the aqueous solution during manufacturing, performing the stabilization action in advance. This preliminary action ensures the solution remains stable during storage and transport, eliminating the need for fresh preparation before administration.
4Ease of manufacture
If conventional aqueous solutions are used, then ease of manufacture is improved, but productivity deteriorates due to limited shelf life
Solution Approach 1:
The amino acid stabilization system maintains continuous protective action against decomposition throughout the shelf life of the product. This continuous stabilization enables the solution to remain effective for extended periods, significantly improving productivity by allowing bulk manufacturing and storage without frequent repreduction.
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 resulting solution is highly stable, maintaining over 95% active ingredient content for up to 12 months, allowing for the creation of ready-to-use, long-lasting pharmaceutical preparations that can be stored for extended periods.
Implementation Method 1
using an amino acid with an isoelectric point greater than 7... These amino acids are preferably present in the aqueous preparation in a concentration of approximately 0.05 to 0.2 mol/liter
Implementation Method 2
at least one acid to adjust the pH to a value in the range of about 3 to 5 in the aqueous solution... The acid used to adjust the pH to a value in the range from 3 to 5 is an amino acid with an isoelectric point less than 3.5 and an organic acid
Data Source
AI summary
Aqueous pharmaceutical preparation comprises a vecuronium bromide as a pharmaceutically active component, an amino acid with an isoelectric point greater than 7 and at least an acid to adjust the pH value to 3-5. An independent claim is included for the preparation of the aqueous pharmaceutical preparation comprising providing an amino acid with an isoelectric point greater than 7 and dissolving under agitation; providing an acid for adjusting the pH value to 3-5 and agitating for dissolution; providing an vecuronium bromide and agitating for dissolution; and optionally providing an acid for adjusting the pH value to 3-5.