Amide-Substituted Xanthene Dyes for Reduced Aggregation
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Solution Overview
Problem
Phosphonate-substituted xanthene dyes, particularly rhodamines, rhodols, and fluoresceins, face challenges with undesired side reactions due to the activation of the 3-carboxy group, leading to reduced formation of target mono-activated dyes and aggregation issues in biological samples.
Innovation Solution
Substituting the 3-carboxy group with a 3-amido group in phosphonate-substituted xanthene dyes to prevent undesired side reactions and enhance aqueous solubility, while maintaining conjugation capability and hydrophilicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phosphonate-substituted xanthene dyes with 3-carboxy group are used, then conjugation capability is provided, but undesired side reactions occur due to activation of the 3-carboxy group
Solution Approach 1:
The patent removes the problematic 3-carboxy group from the dye molecule and replaces it with a 3-amido group. This extraction of the harmful functional group eliminates the undesired side reactions while the amido group provides alternative functionality. The carboxy group is completely taken out rather than modified, solving the reliability issue.
Solution Approach 2:
The patent changes the chemical parameter of the substituent at the 3-position from carboxy (-COOH) to amido (-CONR2). This parameter change transforms the reactive carboxy group into a more stable amido group that does not undergo undesired side reactions, while still maintaining the ability to provide conjugation capability through the phosphonate groups.
2Ease of operation
If phosphonate-substituted xanthene dyes are used, then hydrophilicity is improved, but aggregation occurs in biological samples
Solution Approach 1:
The patent applies different functional groups at different positions of the xanthene molecule to achieve localized functions. The phosphonate groups at one position provide hydrophilicity and prevent aggregation, while the 3-amido group at another position provides stability and prevents side reactions. This local differentiation of functional properties solves both contradictions.
Solution Approach 2:
The patent creates a composite molecular structure combining phosphonate groups with amido-substituted xanthene core. This composite structure integrates the hydrophilic properties of phosphonate groups with the stability of amido groups, achieving both improved solubility and reduced aggregation in biological samples.
3Productivity
If 3-carboxy group is activated for conjugation, then conjugation capability is enhanced, but formation of target mono-activated dyes is reduced due to side reactions
Solution Approach 1:
The patent uses the 3-amido group as an intermediary that prevents direct activation of the carboxy group. By replacing the carboxy group with amido, the molecule avoids the side reaction pathway entirely while the phosphonate groups serve as the primary conjugation sites, achieving high selectivity for mono-activation.
Data Source
AI summary
The present invention provides amide-substituted xanthene fluorescent dyes and reagent for the introduction of phosphonate or sulfo groups into the fluorescent dyes.