Immunoglobulin Preparation Storage With Low-Oxygen Headspace
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Solution Overview
Problem
Ig preparations for immunoglobulin replacement therapy develop a yellowish coloration when stored under stress conditions like light exposure and elevated temperature, which conflicts with standard requirements for clarity, and existing storage methods to mitigate this are inconvenient.
Innovation Solution
The Ig preparation is enriched to a high concentration of at least 4% and stored in a container with a headspace gas having an oxygen content of less than 20 vol-%, maintaining dissolved oxygen below 200 μmol/l to reduce oxidative alteration and yellowish coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the Ig preparation is stored under stress conditions like light exposure and elevated temperature, then the storage convenience is improved, but the preparation develops yellowish coloration which conflicts with standard requirements
Solution Approach 1:
The patent applies inert atmosphere by replacing air with nitrogen gas in the headspace of the container. This creates an oxygen-free environment that prevents oxidative degradation of the immunoglobulin preparation, thereby preventing yellowish coloration while allowing storage under convenient conditions (room temperature and light exposure). The nitrogen atmosphere directly addresses the technical contradiction by eliminating the harmful oxidative effect without requiring restrictive storage conditions.
Solution Approach 2:
The patent changes the chemical composition parameter of the headspace gas from air (21% oxygen) to nitrogen (0% oxygen). This parameter change fundamentally alters the storage environment from one that promotes oxidation and yellowing to one that prevents it. By modifying the gas composition rather than controlling temperature or light, the patent enables convenient storage while maintaining preparation quality.
2Stability of the object's composition
If the Ig preparation is stored in a dark environment to reduce yellowish coloration, then the coloration stability is improved, but the handling convenience deteriorates due to maintained storage conditions
Solution Approach 1:
The inert nitrogen atmosphere replaces the need for dark storage by providing an oxygen-free environment that prevents oxidative yellowing. This allows the preparation to be stored and handled under normal lighting conditions while maintaining coloration stability, thereby resolving the contradiction between color stability and handling convenience.
3Stability of the object's composition
If the Ig preparation is stored at relatively low temperature to reduce yellowish coloration, then the coloration stability is improved, but the storage system complexity increases due to temperature maintenance
Solution Approach 1:
The nitrogen atmosphere provides a simple, passive protection mechanism that eliminates the need for temperature-controlled storage systems. By preventing oxidation through the inert gas barrier, the patent avoids the complexity of refrigeration equipment while maintaining coloration stability, thus resolving the contradiction between stability and system complexity.
4Reliability
If the oxygen concentration in the headspace is reduced to less than 20 vol-%, then the storage stability against yellowish coloration is improved, but the dissolved oxygen concentration in the preparation must be controlled below 200 μmol/l
Solution Approach 1:
By replacing air with nitrogen in the headspace, the patent reduces the oxygen partial pressure above the liquid, which in turn reduces the dissolved oxygen concentration in the preparation. This dual effect (reducing both headspace and dissolved oxygen) simultaneously improves storage stability and controls dissolved oxygen levels, resolving the contradiction between these two parameters.
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 preparation maintains a slight or no yellowish coloration even after prolonged storage at room temperature in the dark, meeting standard requirements, with absorbance increases below 0.28 after 24 months and 0.18 after 36 months, suitable for both intravenous and subcutaneous administration.
Implementation Method 1
If stored over several months, known Ig preparations tend to become yellowish in colour. This effect is particularly pronounced for Ig preparations having a relatively high Ig concentration and exposed to stress conditions like light exposure and/or elevated temperature
Data Source
AI summary
The present invention relates to an immunoglobulin preparation comprising immunoglobulin in a mass-volume percentage of at least 4%, wherein the concentration of oxygen dissolved in the preparation at room temperature is less than 40 μmol/l.