Semiconductor Polymer Dot Transducers for Stable In Vivo Glucose Monitoring
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Solution Overview
Problem
Current methods for monitoring the concentration of fluid constituents, such as small molecules and proteins, in vivo are limited by poor sensitivity, specificity, and response speed, often requiring invasive procedures and suffering from issues like signal drift and interference from biological species.
Innovation Solution
The development of nanoparticle transducers, specifically using semiconductor polymer dots (Pdots) conjugated with enzymes like glucose oxidase, which catalyze reactions that change the concentration of reaction elements, thereby modulating fluorescence emission and allowing for precise measurement of analyte concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If electrochemical transducers are used for in vivo monitoring, then continuous monitoring capability is achieved, but signal drift and impaired response occur requiring frequent electrode replacement
Solution Approach 1:
The patent replaces electrochemical transducers with optical transducers that use fluorescence emission from semiconductor polymer dots. This substitution eliminates the signal drift and electrode degradation issues inherent in electrochemical systems, providing stable long-term monitoring without frequent replacement. The optical detection method does not suffer from the same biocompatibility and signal stability problems as implanted electrodes.
Solution Approach 2:
The patent changes the detection parameter from electrical signals to optical signals (fluorescence emission). By using fluorescence intensity or wavelength changes in response to analyte concentration, the system achieves stable, drift-free measurements over extended periods, resolving the reliability issue while maintaining continuous monitoring capability.
2Object-affected harmful factors
If Raman techniques are used for optical detection, then non-invasive measurement is achieved, but Raman signals from small molecules are weak and masked by biological species
Solution Approach 1:
The patent introduces semiconductor polymer dots as intermediary probe molecules that emit fluorescence when excited. These Pdots serve as mediators between the light source and the analyte, providing strong, distinct fluorescence signals that are not masked by biological species. The Pdot fluorescence acts as a bright intermediary signal that can be easily distinguished from background biological fluorescence.
Solution Approach 2:
The patent changes the detection signal from weak Raman scattering to strong fluorescence emission. Fluorescence provides signals that are orders of magnitude brighter than Raman signals, enabling sensitive detection of small molecules without being masked by overlapping biological signals. This parameter change from scattering to emission fundamentally improves detection sensitivity.
3Illumination intensity
If larger nanoparticles are used for detection, then signal intensity increases, but penetration and distribution in crowded cellular spaces is reduced
Solution Approach 1:
The patent optimizes the nanoparticle size parameter to achieve the desired balance. By controlling the Pdot size to be small (suitable for cellular penetration) while maintaining high fluorescence quantum yield, the system achieves both good tissue penetration and strong signal intensity. The parameter optimization of size versus brightness resolves the contradiction between penetration capability and signal strength.
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
These nanoparticle transducers provide sensitive and specific detection of analytes, enabling real-time monitoring of fluid constituents in vivo with improved response speed and accuracy, as demonstrated by successful glucose monitoring in mouse models.
Implementation Method 1
The chromophore emits fluorescence in an amount determined by a concentration of a reaction element of the plurality of reaction elements
Implementation Method 2
The enzyme is configured to catalyze a reaction. The reaction comprises a plurality of reaction elements, including one or more reactants and one or more products
Data Source
AI summary
The present disclosure provides nanoparticle transducers and methods of use thereof for the detection of analyte concentrations in a fluid. Nanoparticle transducers can comprise a nanoparticle, such as a Pdot, coupled to an enzyme that catalyzes a reaction with the analyte. The nanoparticle transducers further comprise chromophores that emit fluorescence that varies as a function of the concentration of one of the elements of the reaction. The nanoparticle transducer thus changes fluorescence as the analyte concentration changes, transforming analyte concentration values into fluorescence intensities. The measurement of these intensities provides a measurement of the analyte concentration. The nanoparticle transducers are biocompatible, allowing for use in vivo, for the monitoring of analyte blood concentrations such as blood glucose concentrations.