Red-Shifted Rhodamine Fluorophores for Nonfluorescent-State Control
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Solution Overview
Problem
Existing far-red and near-infrared rhodamine dyes suffer from poor performance due to their propensity to adopt a nonfluorescent form, limiting their use in biological imaging where autofluorescence and scattering are minimized.
Innovation Solution
A general chemical modification for rhodamines that optimizes long-wavelength variants and enables facile functionalization with different chemical groups, allowing for the synthesis of cell- and tissue-permeable rhodamine labels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If far-red and near-infrared rhodamine dyes are used, then autofluorescence and scattering are minimized, but the dyes suffer from poor performance due to adopting a nonfluorescent form
Solution Approach 1:
The patent modifies the chemical structure of rhodamine dyes by changing parameters such as incorporating four-membered azetidine rings and adjusting substituent groups (e.g., at positions 3 and 6 of the xanthylium ring system). These structural parameter changes prevent the dyes from adopting nonfluorescent forms while maintaining their far-red and near-infrared emission properties, thus resolving the contradiction between minimizing autofluorescence/scattering and maintaining fluorescent performance.
Solution Approach 2:
The patent creates hybrid fluorescent structures by combining rhodamine core structures with azetidine rings and various functional groups. This composite approach allows the dye to simultaneously achieve far-red/NIR emission (minimizing autofluorescence and scattering) and maintain fluorescent performance by preventing nonfluorescent form adoption through the composite structural elements.
2Illumination intensity
If rhodamine dyes are optimized for short-wavelength applications, then brightness is improved, but the optimization strategies cannot be applied to far-red and NIR variants
Solution Approach 1:
The patent develops a universal optimization strategy based on incorporating four-membered azetidine rings and specific substituent patterns that can be applied across the entire rhodamine spectrum. This multi-functional approach allows the same structural modification principle to enhance brightness for short-wavelength dyes while simultaneously enabling far-red and NIR variants to maintain fluorescent performance, thus achieving adaptability across different wavelength ranges.
Solution Approach 2:
The patent establishes a general parameter change approach involving azetidine ring incorporation and substituent modification that can be systematically applied to optimize rhodamine dyes across different wavelength ranges. This parameter-based strategy enables universal optimization of brightness and fluorescent performance regardless of whether the dye is designed for short-wavelength or far-red/NIR applications.
3Reliability
If synthetic fluorophores are used, then brightness and photostability are improved, but the dyes suffer from poor performance in complex biological environments
Solution Approach 1:
The patent modifies the chemical parameters of synthetic rhodamine dyes by incorporating azetidine rings and functional groups that enhance their compatibility with complex biological environments. These parameter changes maintain the high photostability and brightness of synthetic fluorophores while preventing them from adopting nonfluorescent forms in biological systems, thus resolving the contradiction between photostability and biological environment performance.
Solution Approach 2:
The patent introduces functional groups and structural elements (such as azetidine rings and specific substituents) as intermediary components that mediate between the synthetic fluorophore structure and the complex biological environment. These intermediary elements enable the synthetic dye to maintain its photostability and brightness while adapting to biological conditions, preventing nonfluorescent form adoption.
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
Enhances the brightness and photostability of rhodamine fluorophores, enabling their use in complex biological environments for improved fluorescence imaging.
Implementation Method 1
fluorescence imaging using far-red or near-infrared (NIR) light is desirable due to less scattering and lower autofluorescence
Data Source
AI summary
A compound of the following structure is provided: