Cyclodextrin Rotaxane Biosensor Simplifies Xenon MRI Probe Synthesis
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Solution Overview
Problem
Conventional supramolecular hosts for xenon in hyperpolarized xenon-129 magnetic resonance imaging (HP Xe MRI) biosensors are difficult and cumbersome to synthesize and functionalize, limiting their availability for in vivo imaging.
Innovation Solution
A supramolecular complex comprising a macrocycle host with a hydrophobic cavity and an axle functionalized with an affinity tag, where the axle is threaded through the macrocycle cavity, allowing for reversible xenon encapsulation and detection, using cyclodextrin-based rotaxane-type biosensors that are simpler to synthesize and more efficient for imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional supramolecular hosts (cryptophane-A, cucurbit[6]uril) are used for xenon encapsulation, then xenon binding capability is achieved, but synthesis complexity and manufacturing difficulty increase significantly
Solution Approach 1:
The supramolecular host is divided into two separate components: a macrocycle host and an axle/bar. The macrocycle host contains the hydrophobic cavity for xenon binding, while the axle carries the affinity tag for target recognition. These components self-assemble through non-covalent interactions, avoiding complex covalent synthesis of fully functionalized cages while maintaining both xenon binding and target specificity.
Solution Approach 2:
The axle acts as an intermediary component that connects the macrocycle host to the affinity tag. This modular design allows independent optimization of each component's function and simplifies synthesis, as the axle can be separately synthesized and then assembled with the macrocycle through supramolecular interactions rather than requiring complex covalent bonding.
2Reliability
If conventional supramolecular hosts are used, then xenon encapsulation is achieved, but functionalization for specific target detection becomes cumbersome
Solution Approach 1:
The functional components are segmented into separate modules: the macrocycle host handles xenon encapsulation while the axle handles target recognition through its affinity tag. This separation allows independent functionalization of each component without affecting the other, simplifying the overall functionalization process.
Solution Approach 2:
The macrocycle host serves as a universal platform for xenon binding that can be combined with different affinity tags on the axle to detect various targets. This modular design allows the same macrocycle structure to be used across multiple applications by simply changing the affinity tag component.
3Measurement precision
If traditional xenon cages are used for biosensing, then detection sensitivity is achieved, but availability for in vivo imaging is limited due to synthesis difficulties
Solution Approach 1:
By segmenting the biosensor into a macrocycle host and an axle component, the synthesis pathway is simplified and made more scalable. This enables production of sufficient quantities for in vivo imaging applications while preserving the detection sensitivity through maintained xenon binding capability in the macrocycle host.
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 cyclodextrin-based rotaxane-type biosensors enable efficient detection of xenon by HyperCEST, achieving signal enhancements comparable to traditional xenon cages, with simpler synthesis and higher yields, facilitating in vivo imaging applications.
Implementation Method 1
a macrocycle host having a hydrophobic cavity... the Xe will be reversibly encapsulated by the xenon cage in a traditional host-guest interaction
Implementation Method 2
The Hyperpolarized Chemical Exchange Saturation Transfer (hyperCEST) pulse sequence is a scheme for amplifying HP Xe NMR signals by taking advantage of the continual diffusion of Xe atoms in and out of a Xe-encapsulating cage molecule
Implementation Method 3
The binding component is an affinity tag or antibody that binds to a specific analyte or biochemical receptor
Data Source
AI summary
The invention provides a novel method for synthesizing hyperpolarized xenon-129 (HP Xe) biosensors by using pseudo-rotaxane structures of gamma-cyclodextrin. These supramolecular complexes form novel ternary structures in the presence of HP Xe which can be detected via 129Xe MR spectroscopy and imaging techniques. The rotaxane-type complex can be tagged with an affinity label for detecting a target in a biological subject.