Mitomycin C Freeze-Drying Process for Stability and Rapid Reconstitution
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Solution Overview
Problem
Current freeze-dried pharmaceutical compositions of mitomycin C have short shelf life due to instability and form harmful degradation products, and they require lengthy reconstitution times, limiting their practical application.
Innovation Solution
A process involving the freeze-drying of mitomycin C solutions with specific organic solvents like tert-butanol and water, which maintains stability and purity, allowing for rapid reconstitution into high-concentration solutions with minimal degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If mitomycin C is prepared as a lyophilisate using conventional methods, then it can be stored as a dry powder, but the shelf life is limited to at most two years due to high instability and degradation
Solution Approach 1:
The patent changes the chemical parameters of the lyophilisation solution by specifying precise concentrations of mitomycin C (0.1-10 mg/ml), organic solvent (10-50 vol.-%), and buffer components. These parameter optimizations stabilize the mitomycin C during freeze-drying, preventing degradation and extending shelf life while maintaining reliability.
Solution Approach 2:
The patent creates a composite lyophilisation solution combining mitomycin C with specific organic solvents (tert-butanol, ethanol, isopropanol), buffers (phosphate, citrate, acetate), and stabilizers (mannitol, sorbitol, sucrose). This composite formulation protects mitomycin C from degradation during freeze-drying and storage, resolving the contradiction between shelf life and stability.
2Duration of action of stationary object
If mitomycin C is prepared as dry powder, then shelf life is extended to about four years, but dust is formed during preparation causing health-endangering contamination
Solution Approach 1:
The patent introduces an intermediary lyophilisation solution containing mitomycin C dissolved in organic solvent and buffer, which serves as a stable intermediate form. This solution can be stored for extended periods and only requires reconstitution before use, eliminating the need for dry powder handling and preventing dust formation while maintaining long shelf life.
3Duration of action of stationary object
If dry powders are used, then shelf life is longer, but the dissolution time is excessively long
Solution Approach 1:
The patent performs preliminary action by pre-dissolving mitomycin C in the lyophilisation solution before freeze-drying. The resulting lyophilisate contains pre-formed stable complexes that rapidly reconstitute upon contact with solvent, reducing reconstitution time while maintaining extended shelf life compared to conventional dry powders.
4Duration of action of stationary object
If conventional lyophilisates are used, then they can be stored, but the reconstitution yields low concentration solutions due to poor solubility
Solution Approach 1:
The patent changes the solvent system parameters by incorporating organic solvents (tert-butanol, ethanol, isopropanol) in optimized concentrations (10-50 vol.-%) alongside aqueous buffers. This modified solvent composition increases mitomycin C solubility, enabling reconstitution to higher concentrations (up to 10 mg/ml or more) while maintaining shelf life stability.
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 process results in a stable and pure freeze-dried composition that can be rapidly reconstituted into high-concentration solutions, extending shelf life and reducing reconstitution time, thereby improving the practicality and safety of mitomycin C administration.
Implementation Method 1
a process involving the freeze-drying of mitomycin C solutions with specific organic solvents like tert-butanol and water
Implementation Method 2
A process involving the freeze-drying of mitomycin C solutions with specific organic solvents like tert-butanol and water, which maintains stability and purity
Data Source
AI summary
A process is described for the preparation of freeze-dried pharmaceutical compositions of mitomycin C, which are characterized by high stability and can be rapidly reconstituted to form solutions.