Upconversion Paper Microfluidics for On-Site 17β-E2 Detection
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Solution Overview
Problem
Conventional methods for detecting 17β-estradiol (17β-E2) are expensive, complex, and lack the capability for rapid on-site quantitative analysis, which is crucial for medical diagnosis and food safety control.
Innovation Solution
A biosensing platform utilizing an upconversion luminescent paper-based microfluidic device and a portable detection device based on smartphone imaging, incorporating upconversion luminescent biosensors for in-situ sampling and target detection, involving the synthesis of core-shell-shell upconversion nanoparticles (UCNPs) and modification with DNA and a dye for specific recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods (HPLC, ELISA) are used, then detection accuracy is maintained, but device complexity and testing cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical detection systems (HPLC, ELISA) with a portable optical detection system based on upconversion luminescence. The core-shell-shell UCNPs convert infrared light to visible light, enabling detection using simple optical instruments like smartphones or handheld fluorometers, thus reducing device complexity while maintaining detection accuracy.
Solution Approach 2:
The patent changes the detection parameter from conventional methods to upconversion luminescence intensity. By using UCNPs with specific core-shell-shell structures and surface modifications, the detection relies on measuring the upconverted light intensity, which can be performed with portable devices, thereby simplifying the overall system while preserving measurement precision.
2Measurement precision
If conventional detection methods are used, then detection accuracy is maintained, but testing time and productivity decrease
Solution Approach 1:
The patent incorporates preliminary action through the pre-synthesis of core-shell-shell UCNPs with specific surface modifications (carboxyl groups) and the pre-preparation of aptamer-conjugated nanoparticles. These pre-modified UCNPs can directly bind to 17β-E2 targets without requiring complex sample preparation steps during actual testing, enabling rapid on-site detection while maintaining accuracy.
Solution Approach 2:
The patent substitutes time-consuming conventional detection procedures with rapid optical measurement of upconversion luminescence. The portable detection system allows for quick measurement of luminescence intensity changes, significantly reducing testing time and improving productivity compared to HPLC and ELISA methods.
3Measurement precision
If conventional detection methods are used, then detection capability is maintained, but ease of operation and portability decrease
Solution Approach 1:
The patent replaces complex operational procedures of HPLC and ELISA with simple optical measurement operations. The portable detection system requires only the insertion of a test strip or sample container into a handheld device, followed by automatic reading of upconversion luminescence signals, making the system easy to operate and suitable for field deployment.
Solution Approach 2:
The patent implements self-service through the use of aptamer-conjugated UCNPs that automatically bind to 17β-E2 targets without requiring skilled operators. The system performs sample preparation, target enrichment, and detection in a single integrated step, eliminating the need for complex manual procedures and skilled laboratory technicians.
4Measurement precision
If upconversion luminescent biosensors are used, then detection sensitivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by constructing core-shell-shell structured UCNPs with distinct functional layers: an inert core, a middle shell containing rare earth ions for upconversion, and an outer shell with surface groups for aptamer conjugation. This segmented structure allows independent optimization of each layer's properties while simplifying the overall manufacturing process through controlled deposition techniques.
Solution Approach 2:
The patent uses the nested doll principle in the core-shell-shell structure where the middle shell is nested within the outer shell, and the rare earth ion-doped shell is nested within the inert core. This nested architecture enables the integration of multiple functions (structural support, upconversion, surface modification) in a hierarchical manner, maintaining manufacturing feasibility while achieving high detection sensitivity.
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
Enables rapid, on-site quantitative detection of 17β-E2 with high sensitivity and specificity, achieving a detection range of 0.02-200 ng/ml and a limit of 0.012 ng/mL using fluorescence spectrometry, and 0.05-200 ng/ml with a smartphone, suitable for preliminary diagnosis and food safety monitoring.
Implementation Method 1
a biosensing platform for in-situ sampling and target detection based on upconversion luminescence
Implementation Method 2
achieving a detection range of 0.02-200 ng/ml and a limit of 0.012 ng/mL using fluorescence spectrometry
Data Source
AI summary
A biosensing platform for in-situ sampling and target detection based on upconversion luminescence, including: an upconversion luminescent paper-based microfluidic device, an upconversion luminescent biosensor, and a portable detection device based on smartphone imaging. The upconversion luminescent paper-based microfluidic device is configured to sample a to-be-detected substance in situ. The upconversion luminescent biosensor is configured to allow a target to specifically recognize the to-be-detected substance. The portable detection device is configured to detect a content of the to-be-detected substance. The upconversion luminescent biosensor is prepared as follows. (S1) An upconversion nanoparticle seed is prepared. (S2) Core-shell upconversion nanoparticles are prepared. (S3) Core-shell-shell upconversion nanoparticles (UCNPs) are prepared. (S4) The UCNPs is subjected to hydrophilic modification. (S5) The hydrophilically-modified UCNPs are modified with DNA. (S6) The DNA-modified particles obtained from step (S5) are modified with a dye. The to-be-detected substance is 17β-estradiol (17β-E2).