Si-Rhodamine pH Probe Resolving Photobleaching and Measurement Accuracy
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Solution Overview
Problem
Conventional pH probes, particularly ratio type probes based on seminaphthorhodafluor or fluorescein skeletons, suffer from low fluorescence quantum yield, temperature and environment sensitivity, and susceptibility to photobleaching, making long-term imaging and accurate pH measurement within cells challenging.
Innovation Solution
Development of a pH probe using an Si-based rhodamine skeleton with a piperazine ring and electron-withdrawing groups, allowing for high fluorescence quantum yield and resistance to photobleaching, and adjustable pKa for visualization in various pH environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pH probes (seminaphthorhodafluor or fluorescein based) are used, then pH measurement capability is provided, but fluorescence quantum yield is low and photobleaching occurs
Solution Approach 1:
The patent changes the chemical structure parameters of the fluorescent probe by using an Si-based rhodamine skeleton instead of conventional seminaphthorhodafluor or fluorescein structures. This structural parameter change results in improved fluorescence quantum yield and enhanced resistance to photobleaching, directly resolving the contradiction between measurement capability and reliability.
Solution Approach 2:
The patent creates a composite fluorescent probe structure by combining the Si-based rhodamine skeleton with a piperazine ring and electron-withdrawing groups. This composite molecular structure achieves both high fluorescence quantum yield and photobleaching resistance while maintaining pH sensitivity for accurate measurement.
2Measurement precision
If conventional pH probes are used, then pH detection is enabled, but environmental sensitivity causes measurement errors
Solution Approach 1:
The patent modifies the chemical structure parameters by introducing a piperazine ring with electron-withdrawing groups onto the Si-based rhodamine skeleton. This structural modification reduces the probe's sensitivity to temperature and environmental factors while maintaining its pH response characteristics, thereby improving measurement accuracy in varying cellular conditions.
3Measurement precision
If ratio type pH probes are used, then quantitative pH measurement is achieved, but optical system complexity increases
Solution Approach 1:
The patent extracts the pH-sensitive functional group from the complex ratio-type probe structure and incorporates it into the Si-based rhodamine skeleton. This creates a simplified probe structure that maintains quantitative measurement capability through fluorescence intensity changes without requiring complex ratio measurement optical systems.
4Measurement precision
If fluorescent probe concentration changes occur, then cell physiological changes are detected, but false pH measurements result
Solution Approach 1:
The patent changes the chemical parameters of the probe by using the Si-based rhodamine skeleton with piperazine ring, which provides superior cellular stability. This prevents probe leakage and concentration changes during cell contraction, ensuring that fluorescence intensity changes reflect only pH variations and not probe quantity changes, thus resolving the contradiction between detecting physiological changes and maintaining measurement accuracy.
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 new pH probe enables high-accuracy, long-term imaging of pH environments within cells with improved resistance to photobleaching and environmental sensitivity, allowing for precise measurement across weakly acidic, neutral, and basic pH ranges.
Implementation Method 1
Fluorescence imaging uses a pH-sensitive fluorescent probe (abbreviated hereinafter as pH probe) based on an organic small-molecule fluorescent dye and a fluorescent protein. The pH probe has the characteristic of greatly changing fluorescence characteristics as the nearby pH changes.
Data Source
AI summary
Fluorescent probes and their salts have high fluorescence quantum yield and high resistance to photobleaching suitable for visualizing various pH environments within cells such as weakly basic, neutral, and weakly acidic environments. The fluorescent probes can have the following structure: