Acridinium Compounds with Alkoxy Groups for Chemiluminescence
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Solution Overview
Problem
Current chemiluminescent acridinium compounds, particularly acridinium esters, face stability issues due to hydrolysis of the ester linkage, limiting their commercial utility and requiring stabilization strategies to maintain chemiluminescent activity.
Innovation Solution
The placement of electron-donating groups such as methoxy or alkoxy groups at specific positions on the acridinium ring, particularly C-2 and C-7, enhances the quantum yield and stability of acridinium compounds, leading to increased light output and water solubility, while maintaining low non-specific binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If acridinium esters are used as chemiluminescent labels, then light output is achieved, but stability is reduced due to hydrolysis of the ester linkage
Solution Approach 1:
The patent changes the chemical parameters of the acridinium compound by introducing electron-donating groups (such as alkoxy groups at C-2 and C-7 positions) and hydrophilic modifiers. These parameter changes simultaneously improve quantum yield (light output) and stability by preventing hydrolysis of the ester linkage, while also enhancing water solubility.
2Illumination intensity
If hydrophobic modifiers are used to increase light output, then quantum yield is improved, but water solubility is reduced
Solution Approach 1:
The patent applies local quality by introducing hydrophilic modifiers (such as polyethylene glycol chains) at specific locations on the acridinium molecule, particularly at the phenol ester linkage region. This localized modification enhances water solubility without compromising the quantum yield, allowing the compound to maintain both high light output and good aqueous solubility.
3Stability of the object's composition
If sterically stabilizing groups are added to improve stability, then hydrolytic stability is enhanced, but molecular complexity increases
Solution Approach 1:
The patent employs parameter changes by introducing electron-donating groups with specific electronic properties that stabilize the ester linkage through resonance effects. This approach achieves hydrolytic stability through electronic stabilization rather than purely steric hindrance, thereby reducing molecular complexity compared to traditional steric stabilization methods while maintaining enhanced stability.
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 enhanced quantum yield and hydrophilic nature of these compounds improve assay sensitivity by increasing light emission and reducing non-specific binding, making them more suitable for immunoassays and nucleic acid assays.
Implementation Method 1
chemiluminescent acridinium compounds with increased light output... chemiluminescence is triggered by alkaline peroxide... the overall light output, which can also be referred to as the chemiluminescence quantum yield
Implementation Method 2
the placement of electron-donating groups in the acridinium ring increases the amount of light that is emitted... electron-donating groups, such as methoxy or alkoxy groups at C-2 and C-7
Implementation Method 3
hydrophilic versions of these structures, which not only have increased light output but also have increased water solubility
Data Source
Figure 1A~1B
Figure 2A~2B
AI summary
The present invention relates to hydrophilic, high quantum yield acridinium compounds. It has been discovered that the placement of electron-donating groups in the acridinium ring system increases the amount of light that is emitted by the corresponding acridinium compound when its chemiluminescence is triggered by alkaline peroxide. More specifically, it has been found that the placement of one or two hydrophilic, alkoxy groups at the C-2 and/or C-7 position of the acridinium ring system of acridinium compounds increases their quantum yield and enhances the aqueous solubility of these compounds. The present hydrophilic, high quantum yield, acridinium compounds are useful chemiluminescent labels for improving the sensitivity of immunoassays.