Conjugated Oligoelectrolyte Membrane Probes for Stable Cell Labelling
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Solution Overview
Problem
Flow cytometry faces challenges with weak fluorescence intensity, label degradation, limited fluorophore binding sites, signal overlap, and toxicity of existing fluorescence labels, particularly for bacterial cells, leading to inaccurate and toxic results.
Innovation Solution
Conjugated oligoelectrolytes (COEs) with tunable fluorescence properties are used as membrane probes, allowing selective targeting and enhanced fluorescence signals in cell membranes, overcoming issues of signal overlap and toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional fluorescence labels are used for cell labelling, then fluorescence detection can be achieved, but the fluorescence intensity is weak and the labels are degraded due to light exposure
Solution Approach 1:
The patent modifies the chemical structure of fluorescence labels by introducing rigidifying groups and cyclic structures into the molecular backbone. This structural parameter change increases the rigidity of the label, preventing photodegradation and maintaining fluorescence intensity over time, thereby resolving the contradiction between weak fluorescence intensity and label stability
Solution Approach 2:
The patent creates composite fluorescence labels by combining multiple functional moieties - including rigidifying groups, cyclic structures, and fluorescent chromophores - into a single integrated molecular structure. This composite approach enhances both the fluorescence intensity and the stability of the label against light-induced degradation
2Adaptability or versatility
If multiple fluorescence labels are used for cell analysis, then comprehensive cell characterization can be achieved, but signal overlap occurs causing confusing or uninterpretable results
Solution Approach 1:
The patent assigns different spectral properties to different fluorescence labels within the same system. Each label is designed with specific excitation and emission wavelengths, allowing simultaneous use of multiple labels without signal overlap. This local differentiation of spectral characteristics enables comprehensive cell characterization while maintaining clear signal resolution
Solution Approach 2:
The patent expands the detection dimension by utilizing the spectral dimension - differentiating labels not just by intensity but by their unique wavelength signatures. This dimensional expansion allows multiple labels to be used simultaneously without interference, as each label occupies a distinct position in the spectral domain
3Ease of operation
If conventional fluorescence labels are used, then cell labelling can be performed, but the labels are toxic to cells providing only a short working window
Solution Approach 1:
The patent replaces conventional toxic fluorescence labels with structurally modified labels that have reduced cytotoxicity. The new labels maintain their labelling functionality but are designed to be biocompatible, extending the working window from minutes to hours or days without compromising cell viability or labelling efficiency
4Measurement precision
If fluorescence labels are coupled with cell components, then specific cell targeting can be achieved, but the coupling is weak leading to label detachment
Solution Approach 1:
The patent divides the fluorescence label into modular components - a stable backbone structure and interchangeable targeting moieties. This segmentation allows the targeting component to be optimized for strong, specific binding to cell components while the backbone provides structural stability, preventing label detachment while maintaining targeting specificity
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
COEs provide robust and selective fluorescence labeling with improved signal-to-noise ratio, enabling accurate detection and analysis of cells and lipid vesicles without toxic effects.
Implementation Method 1
Flow cytometry utilizes a microfluidic system, in which individual cells or particles flow into a stream and are quickly passed through a laser light source, that is then being analyzed via fluorescence or light scattering
Data Source
AI summary
The present disclosure relates to compounds of Formula (I) and their methods of use thereof. The compounds of Formula (I) are conjugated oligoelectrolytes and are suitable for use as a membrane probe to label and/or detect cells and/or lipid vesicles and thus in flow cytometry applications. The present disclosure also relates to a flow system for detecting and/or quantifying cells and/or lipid vesicles.