Azacyanine Dye Structures for Stable, Soluble In Vivo Imaging
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Solution Overview
Problem
Existing cyanine dyes used for in vivo imaging lack chemical stability, thermal stability, and photostability, and often have issues with aqueous solubility and charge modification, limiting their effectiveness in biomedical applications such as disease diagnosis and prognosis.
Innovation Solution
Development of azacyanine dyes with specific structural modifications, including the incorporation of aza moieties in indolenium heterocycles and methine chains, to enhance chemical and thermal stability, and the introduction of physiochemistry modifying groups to improve solubility and bioconjugation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cyanine dyes are used for in vivo imaging, then fluorescence imaging capability is achieved, but chemical stability and thermal stability are insufficient
Solution Approach 1:
The patent modifies the chemical structure of cyanine dyes by incorporating aza moieties (nitrogen-containing groups) into the indolenium heterocycles and methine chains. This structural parameter change enhances both chemical stability and thermal stability while preserving the fluorescence imaging capability. The aza substitution alters the electronic properties and bonding strength of the dye molecules, making them more stable under physiological conditions.
2Quantity of substance
If traditional cyanine dyes are used, then fluorescence emission is achieved, but aqueous solubility is poor
Solution Approach 1:
The patent introduces physiochemistry modifying groups at specific positions on the cyanine dye structure. These local modifications include adding hydrophilic substituents to the heterocyclic rings or methine chains, which locally increase water solubility without compromising the overall conjugated system responsible for fluorescence. This allows the dye to maintain its optical properties while improving solubility in aqueous biological environments.
3Reliability
If traditional cyanine dyes are used, then imaging capability is achieved, but photostability is insufficient
Solution Approach 1:
The patent creates a composite molecular structure by combining the cyanine chromophore with aza moieties and physiochemistry modifying groups. This composite structure enhances photostability through the increased rigidity and reduced flexibility of the aza-containing framework, which resists photo-induced degradation. The modified structure maintains the desired fluorescence properties while being more resistant to photobleaching during imaging procedures.
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 azacyanine dyes exhibit improved stability and solubility, enabling effective in vivo imaging and bioconjugation, facilitating disease diagnosis and prognosis through enhanced imaging capabilities.
Implementation Method 1
Fluorescent dyes form the building blocks of many reagents that are used in a myriad of bioanalytical applications... The molecules are able to absorb light energy and emit light of a different colour.
Data Source
AI summary
The application provides fluorescent dyes, which are cyanine dyes that incorporate additional aza moieties in the indolenium heterocycles and/or in the methine chains connecting them. Symmetrical and unsymmetrical chemically reactive azacyanine dyes are described for conjugation, as well as their bioconjugates for in-vitro and in-vivo assays and fluorescence imaging.