Superabsorbent Polymer Biosensor Material for Stable Analyte Detection
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Solution Overview
Problem
Existing absorbent articles with biosensing capabilities face challenges such as variable analyte concentration, unpredictable fluid flow, dilution of reaction components, complexity and cost of manufacture, and instability of hydrogel-based sensing systems, which affect the accuracy and durability of analyte detection.
Innovation Solution
The use of dry superabsorbent polymer (SAP) particles pre-loaded with reaction components that absorb and react with sample liquid to detect analytes, providing a controlled sample chamber for accurate and stable detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogel-based sensing systems are used for analyte detection, then sensing capability is provided, but stability and lifetime are poor
Solution Approach 1:
The patent changes the physical state parameter of the sensing system from hydrogel (wet) to superabsorbent polymer (dry), which fundamentally alters the stability and lifetime characteristics. The dry SAP particles provide long-term stability while maintaining sensing capability upon liquid contact.
2Reliability
If separate test strips or discrete detection devices are attached to absorbent articles, then analyte detection capability is provided, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the absorbent function and detection function into a single integrated component. The SAP particles serve dual purposes: absorbing bodily fluid and providing the sensing environment for analyte detection, eliminating the need for separate test strips or detection devices.
Solution Approach 2:
The SAP particles are designed to perform multiple functions simultaneously: fluid absorption, reaction component delivery, and analyte detection. This multi-functionality reduces overall device complexity while maintaining detection capability.
3Reliability
If reaction components are placed in absorbent articles for analyte detection, then detection function is provided, but variable fluid flow and dilution affect measurement precision
Solution Approach 1:
The patent creates localized detection zones within the SAP particle structure. The reaction components are contained within or on the SAP particles, creating controlled local environments for analyte detection that are isolated from the effects of variable fluid flow and dilution in the bulk absorbent article.
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 allows for reliable, cost-effective, and stable detection of analytes in absorbent articles by ensuring consistent reaction conditions and minimizing manufacturing complexity, while maintaining accuracy over time.
Implementation Method 1
dry superabsorbent polymer (SAP) configured to receive a sample liquid; upon insult of sample liquid, the dry superabsorbent polymer absorbs sample liquid
Data Source
AI summary
The invention relates to an absorbent sensing material for interrogation of sample liquid to detect analyte, comprising: dry superabsorbent polymer (SAP) configured to receive a sample liquid; the absorbent material comprising, within the dry superabsorbent polymer, at least one dry reaction component for detecting and for signalling the presence of 5 analyte; wherein, upon insult of sample liquid, the dry superabsorbent polymer absorbs sample liquid, the at least one dry reaction component dissolves and, if analyte is present in the sample liquid, its presence is detected and signalled. The invention also relates to use of the absorbent sensing material, absorbent articles and methods of manufactures of absorbent articles and test sensors such as test strips.