Cyanine Dye Structural Design for Aqueous Fluorescence Stability
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Solution Overview
Problem
Current fluorescent dyes used in biotechnology for immunohistochemistry face challenges in providing strong fluorescence in aqueous solutions, stability across various pH conditions, and minimizing photobleaching, while also needing to avoid overlapping with the fluorescence range of biomolecules, which limits their effectiveness in simultaneous analysis of multiple markers.
Innovation Solution
A fluorescent compound represented by Chemical Formula 1, which allows for simultaneous staining of multiple markers, is developed, featuring specific structural parameters that enhance fluorescence intensity, stability, and minimize photobleaching, enabling effective analysis of proteins, DNA, RNA, and antibodies in immunohistochemistry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional fluorescent dyes are used in aqueous solutions for immunohistochemistry, then fluorescence intensity is reduced, but using alternative dyes may improve intensity yet compromise stability or increase photobleaching
Solution Approach 1:
The patent modifies the chemical structure of cyanine dyes by introducing specific substituents (such as sulfur-containing groups and aromatic rings) at defined positions in the polymethine chain, thereby changing the physical and chemical parameters of the dye to achieve enhanced fluorescence intensity while maintaining stability and resistance to photobleaching in aqueous environments
Solution Approach 2:
The invention creates composite fluorescent dye structures by combining cyanine chromophores with additional functional groups and substituents, forming a composite molecular structure that integrates multiple properties: high fluorescence intensity, aqueous stability, and photobleaching resistance, thereby resolving the contradiction between intensity and reliability
2Adaptability or versatility
If multiple conventional fluorescent dyes are used for simultaneous marker detection, then wavelength overlap with biomolecule fluorescence occurs, but using dyes in different wavelength regions may avoid overlap yet reduce detection sensitivity
Solution Approach 1:
The patent segments the fluorescence detection spectrum into multiple distinct wavelength regions by developing cyanine dye derivatives with different polymethine chain lengths and substituents, each emitting at specific wavelengths (e.g., 500-550 nm, 550-600 nm, 600-650 nm, 650-700 nm), allowing simultaneous detection of multiple markers without spectral overlap while maintaining high detection sensitivity in each region
Solution Approach 2:
The invention applies local quality by optimizing specific regions of the electromagnetic spectrum for different dye variants, where each dye is tailored to emit in a specific wavelength window with high intensity, thereby enabling multi-marker detection with optimal sensitivity in each spectral region without interference from biomolecule autofluorescence
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 compound enables detailed and effective analysis of biomaterials by providing strong fluorescence, stability, and reduced photobleaching, allowing for the simultaneous detection of multiple markers on a single slide, improving diagnostic capabilities in immunohistochemistry.
Implementation Method 1
the fluorescent compound of chemical formula 1... emit strong fluorescence... excitation and fluorescence wavelengths suitable for fluorescence equipment
Data Source
AI summary
Provided is a fluorescent compound for labeling a biomaterial having the following Chemical Formula 1:In Chemical Formula 1 above,n is an integer of 1 to 6,X1 and X2 are the same as or different from each other, and each independently selected from H, —SO3− and —SO3H,R1 and R2 are the same as each other or each independently selected from C1-7 alkyl, substituted or unsubstituted C8-20 alkyl, —(CH2)m1SO3−, —(CH2)m2SO3H, andm1 is an integer of 1 to 7,m2 is an integer of 1 to 7,p1 is an integer of 1 to 10,q1 is an integer of 0 to 10,r1 is an integer of 1 to 10, andY1 is selected from H, —OH, halogen ando1 is an integer of 1 to 10.