Gamma Sterilization of Oxidoreductase Biosensor Membranes
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Solution Overview
Problem
Current methods for sterilizing biosensors with gamma irradiation often result in excessive loss of sensitivity, particularly in environments with high relative humidity, due to damage caused by radiation to membranes containing oxidoreductase enzymes like glucose oxidase.
Innovation Solution
A method involving irradiation of membranes with gamma radiation under vacuum at a relative humidity lower than the environment's humidity, using a desiccant to maintain a lower humidity within a sealed receptacle, thereby minimizing damage and preserving sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gamma irradiation is used to sterilize the biosensor, then sterilization is achieved, but the sensitivity of the biosensor is significantly reduced
Solution Approach 1:
The patent applies vacuum packaging to create an inert environment during gamma irradiation sterilization. The membrane containing the oxidoreductase enzyme is sealed in a vacuum package, eliminating oxygen and other reactive gases that would otherwise be present during sterilization. This inert environment protects the enzyme from radiation-induced damage while still allowing gamma rays to penetrate and sterilize the biosensor, thus resolving the contradiction between achieving sterilization and maintaining sensitivity.
2Reliability
If gamma irradiation is applied at high relative humidity, then sterilization is effective, but enzyme damage increases and sensitivity is lost
Solution Approach 1:
The patent changes the humidity parameter during gamma irradiation by using vacuum packaging. The vacuum environment reduces the relative humidity around the enzyme membrane during sterilization, creating conditions that are less damaging to the oxidoreductase enzyme while still effective for sterilization. This parameter change resolves the contradiction between sterilization effectiveness and enzyme activity preservation.
3Object-affected harmful factors
If conventional sterilization methods are used, then biological contaminants are eliminated, but the biosensor performance deteriorates
Solution Approach 1:
The patent uses vacuum packaging to create an inert atmosphere during sterilization, protecting the biosensor from damage while eliminating biological contaminants. The vacuum-sealed package isolates the enzyme membrane from harmful environmental factors during gamma irradiation, ensuring both sterilization and performance preservation.
Solution Approach 2:
The vacuum package acts as a protective cushion before the gamma irradiation process begins. By pre-sealing the membrane in a vacuum environment, the system prepares a protective barrier that cushions the enzyme against radiation damage during the subsequent sterilization process, thereby maintaining biosensor performance while achieving sterilization.
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
This approach significantly reduces the loss of sensitivity in biosensors, with about 85% of sensitivity retained after gamma irradiation when using this method compared to less than 60% when irradiated at matching environmental humidity.
Implementation Method 1
irradiating the membrane comprising an oxidoreductase enzyme with gamma radiation under vacuum
Implementation Method 2
irradiating the membrane comprising an oxidoreductase enzyme with gamma radiation under vacuum at a relative humidity lower than the relative humidity of the environment
Data Source
AI summary
A method for sterilizing a membrane comprising an oxidoreductase enzyme in an environment having a relative humidity, comprises: irradiating the membrane comprising an oxidoreductase enzyme with gamma radiation under vacuum at a relative humidity lower than the relative humidity of the environment. Associated biosensors are also described.