Tetraphenylethene Fluorescent Sensor for Selective Glucose Detection
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Solution Overview
Problem
Current fluorescent sensors face challenges in selectively detecting glucose due to their limited selectivity, as they often bind more strongly to other structurally similar saccharides like fructose, galactose, and mannose, making it difficult to distinguish glucose in biological samples.
Innovation Solution
Development of a tetraphenylethene (TPE)-based fluorescent sensor, specifically the bis(boronic acid)-functionalized TPE derivative (TPEDB), which utilizes the aggregation-induced emission (AIE) mechanism to enhance fluorescence specifically in the presence of glucose, while remaining unaffected by other monosaccharides, allowing for selective glucose detection and pH monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phenylboronic acid (PBA) units are attached to a fluorophoric molecule to form a fluorescent sensor, then the sensor can detect glucose through photoinduced electron transfer, but the selectivity for glucose is limited because PBA has stronger affinity to other saccharides (Fru, Gal, Man) than to Glu
Solution Approach 1:
The patent divides the sensing function into two independent modules: (1) a fluorophoric molecule that provides fluorescence emission, and (2) a separate PBA unit that provides glucose binding capability. This segmentation allows each module to be optimized independently, with the PBA unit specifically designed for glucose recognition while the fluorophore provides detection capability, thereby improving glucose selectivity without compromising other saccharide binding affinities.
Solution Approach 2:
The patent introduces a water-soluble polymer chain as an intermediary component between the PBA unit and the fluorophoric molecule. This polymer chain acts as a spacer that prevents direct steric interference between the PBA binding site and the fluorophore, allowing the PBA unit to selectively bind glucose while the fluorophore remains available for fluorescence detection, thus resolving the selectivity issue.
2Measurement precision
If TPE-based fluorescent sensor is used to achieve high sensitivity and low background noise, then the sensor can effectively detect glucose, but the sensor must be designed to distinguish glucose from structurally similar monosaccharides which remains a challenging task
Solution Approach 1:
The patent applies local quality by creating a specific binding pocket environment around the PBA unit that is locally optimized for glucose recognition. The water-soluble polymer chain creates a hydrophilic microenvironment that preferentially accommodates glucose molecules, while the PBA unit provides specific chemical recognition. This localized optimization enables high sensitivity detection while maintaining discrimination capability against other monosaccharides.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the molecular structure of the PBA unit and the polymer chain to optimize the binding constants and fluorescence emission characteristics. By tuning the hydrophobicity, charge distribution, and spatial arrangement of the PBA unit relative to the fluorophore, the sensor achieves optimal glucose detection sensitivity while maintaining selectivity through controlled changes in molecular parameters.
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
TPEDB effectively boosts emission by nearly 5.4-fold when glucose reaches 5.0 mM, demonstrating high selectivity for glucose over other monosaccharides and can be used to monitor glucose levels in biological samples, including urine, and serves as a pH indicator in alkaline media.
Implementation Method 1
it has been recently discovered that a group of nonemissive fluorogenic molecules, such as TPE, are induced to fluoresce efficiently by aggregate formation, so called an 'abnormal' phenomenon of aggregation-induced emission (AIE)
Implementation Method 2
the boronic acid groups on TPEDB can react with diols on D-Glu to produce highly emissive oligomers
Implementation Method 3
A photoinduced electron transfer process was utilized to incite an FL turn-on response to the Glu binding
Data Source
AI summary
A method of detecting the presence or absence of saccharide or saccharide level in a biological or artificial sample comprising contacting the sample with a water-soluble tetraphenylethene-cored probe having multiple functionalities of boronic acid and aggregation induced emission (AIE) characteristics, and detecting fluorescence. A method for detecting pH in a sample solution with a certain pH value comprising contacting the sample solution with a water-soluble tetraphenylethene-cored probe having multiple functionalities of boronic acid and aggregation induced emission (AIE) characteristics, and detecting fluorescence.