Vancomycin Aqueous Solution Stabilization
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Solution Overview
Problem
There is a need for aqueous solutions of glycopeptide antibiotics like vancomycin that possess improved long-term stability under normal use and storage conditions, suitable for administration throughout their stability period, as existing solutions face challenges with degradation and require stabilization methods.
Innovation Solution
The use of N-acetylated D-cysteine as a stabilizing agent in aqueous solutions of glycopeptide antibiotics, maintaining a pH between 4.0 and 7.0, which significantly reduces the formation of major degradation products compared to N-acetylated D-alanine, allowing for stable liquid formulations suitable for parenteral administration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vancomycin is formulated as an aqueous solution for liquid state storage, then ease of administration and convenience are improved, but stability of the active agent deteriorates rapidly
Solution Approach 1:
The patent introduces N-acetylated D-alanine as an intermediary stabilizing agent that mediates between the aqueous solution environment and vancomycin. This additive prevents degradation by forming protective interactions with the antibiotic, enabling long-term stability in liquid form without requiring freezing or freeze-drying.
Solution Approach 2:
The patent optimizes specific parameters including pH (maintained between 3-8 using buffers like phosphate or acetate), temperature (storage at refrigerated or ambient conditions), and concentration ratios of vancomycin to N-acetylated D-alanine. These parameter changes transform the unstable aqueous solution into a stable formulation suitable for long-term storage.
2Stability of the object's composition
If vancomycin is stored as a dry solid or frozen liquid preparation, then stability is improved, but complexity of storage and administration increases
Solution Approach 1:
The patent extracts the stabilization function from complex storage procedures (freezing, freeze-drying) and implements it through a simple chemical additive (N-acetylated D-alanine) in the formulation itself. This allows the medication to be stored as a simple liquid at refrigerated or ambient temperatures without special equipment or procedures.
3Stability of the object's composition
If conventional stabilizing agents are used in vancomycin solutions, then some stability is achieved, but degradation products still form significantly compared to N-acetylated D-cysteine
Solution Approach 1:
The patent changes the chemical identity of the stabilizing agent from conventional options (such as N-acetylated D-alanine) to N-acetylated D-cysteine. This specific chemical substitution provides superior stabilization, significantly reducing the formation of degradation products like VANC-[61-Carboxy]-antichloro and VANC-[61-Carboxy]-synchloro while maintaining compatibility and safety.
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 solutions stabilized with N-acetylated D-cysteine demonstrate improved stability over three months, with reduced degradation products, enabling the glycopeptide antibiotics to remain effective and stable for extended periods without the need for reconstitution or freeze-drying, making them suitable for ready-to-use IV formulations.
Implementation Method 1
N-acetylated D-cysteine as a stabilizing agent in aqueous solutions of glycopeptide antibiotics, maintaining a pH between 4.0 and 7.0, which significantly reduces the formation of major degradation products
Implementation Method 2
maintaining a pH between 4.0 and 7.0, which significantly reduces the formation of major degradation products
Data Source
AI summary
The present invention relates to an aqueous solution comprising glycopeptide antibiotics, selected from the group consisting of vancomycin, telavancin, oritavancin, teicoplanin, dalbavancin and mixtures thereof, especially vancomycin, and N-acetylated D-cysteine (D-aCys), the solution having a pH of from about 4.0 to 7.0 and preferably being present in a suitable container with air as headspace. The invention relates further to the use of such an aqueous solution as a medicament, especially for use in the treatment of bacterial infections, and a method for stabilizing glycopeptide antibiotics, especially vancomycin.