Hydrogen Peroxide Indicator Composition for Clear Vapor Detection
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Solution Overview
Problem
Existing sterilization indicators for hydrogen peroxide vapor phase sterilization processes struggle with visual discernibility of color change, making it difficult to determine if the sterilization process has been effectively completed.
Innovation Solution
An indicator article comprising a substrate with an indicator composition containing a catalyst selected from metal oxides, metal sulfides, noble metals, or carbon allotropes, which undergoes a visually detectable optical property change upon exposure to hydrogen peroxide vapor, facilitating easy visual detection of sterilization completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sterilization indicators are used for hydrogen peroxide vapor phase sterilization, then the sterilization process can be monitored, but the color change is difficult to discern visually
Solution Approach 1:
The patent employs indicator compounds that undergo distinct color changes when exposed to hydrogen peroxide vapor. The indicator composition is formulated to produce a visually detectable color transition, enabling clear visual confirmation of sterilization exposure. This directly addresses the difficulty in discerning color changes by using indicators with high-contrast, easily observable color transformations.
2Measurement precision
If enzymatic components are used in the indicator composition, then the detection sensitivity may be improved, but the complexity of the indicator formulation increases
Solution Approach 1:
The patent extracts and eliminates enzymatic components from the indicator formulation, achieving detection sensitivity through non-enzymatic means. The indicator composition relies on chemical compounds and catalysts that can detect hydrogen peroxide without requiring enzymes, thereby simplifying the formulation while maintaining detection capability.
Solution Approach 2:
The patent introduces catalysts as intermediary substances that facilitate the detection reaction between hydrogen peroxide and the indicator compound. These catalysts (such as metal oxides, noble metals, or carbon allotropes) mediate the chemical reaction to produce the color change, providing an alternative to enzymatic mediation that reduces formulation complexity.
3Duration of action of stationary object
If the indicator composition uses stable materials, then the shelf life is improved, but the visual detectability of the color change may be reduced
Solution Approach 1:
The patent carefully selects and formulates indicator compounds with specific optical properties that remain stable during storage but change dramatically when exposed to hydrogen peroxide. The composition parameters (concentration, pH, formulation) are optimized to ensure the indicator maintains its initial state during shelf life while producing a strong, detectable color change upon sterilization exposure.
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 indicator article provides a simple and effective means to visually confirm exposure to hydrogen peroxide vapor sterilization, ensuring reliable detection of sterilization without requiring enzymatic components and maintaining optical properties under ambient lighting conditions.
Implementation Method 1
The indicator composition comprises at least one indicator compound and at least one catalyst, wherein the catalyst is selected from the group consisting of a metal oxide, a metal sulfide, a noble metal, an alloy of noble metals, an allotrope of carbon, and combinations thereof
Implementation Method 2
A visually detectable change in the optical property of the indicator composition is associated with a presence of hydrogen peroxide
Implementation Method 3
The reaction product of hydrogen peroxide and an indicator composition comprising at least one indicator compound; and at least one catalyst
Data Source
AI summary
The disclosed hydrogen peroxide indicator includes a substrate on which is disposed an indicator composition that includes at least one of a select group of indicator compounds and a catalyst. As a result of contact with hydrogen peroxide, the indicator composition changes color, even from colorless to having a visually observable color, thereby providing an indication of the presence of hydrogen peroxide.