STED Microscopy Luminophore Protection Against Bleaching
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Solution Overview
Problem
Existing methods for spatially high-resolution imaging of samples with luminophores, such as STED and GSD microscopy, suffer from significant photochemical bleaching due to high-intensity luminescence deactivation light, while RESOLFT methods compromise on spatial resolution and contrast.
Innovation Solution
A method that combines STED scanning fluorescence light microscopy with an additional step of exposing the sample to excitation-preventing light before luminescence excitation, converting the luminophore into a protective state that shields it from electronic excitations, allowing for high spatial resolution and contrast without substantial bleaching risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-intensity luminescence deactivation light is used to achieve high spatial resolution in STED microscopy, then spatial resolution is improved, but luminophore bleaching increases significantly
Solution Approach 1:
The patent applies preliminary action by exposing the sample to excitation-preventing light before luminescence excitation. This pre-treatment converts the luminophore into a protected state that prevents subsequent excitation and deactivation cycles, thereby preventing bleaching before it can occur while still allowing the desired imaging to proceed in protected regions
Solution Approach 2:
The patent introduces an intermediary mechanism by using a protected state as an intermediate condition between the ground state and the excited state. The excitation-preventing light creates this intermediate protected state that acts as a buffer, preventing the luminophore from entering the excited state and subsequently avoiding the harmful deactivation process that causes bleaching
2Manufacturing precision
If high-intensity luminescence deactivation light is used to narrow the local minimum, then spatial resolution is improved, but photochemical load on the luminophore increases
Solution Approach 1:
The excitation-preventing light is applied in advance to convert luminophores into the protected state before the high-intensity deactivation light is applied. This preliminary protection reduces the photochemical load by preventing the luminophore from entering excited states that would otherwise be subjected to intense deactivation light
Solution Approach 2:
The patent converts the potentially harmful effect of excitation-preventing light (which could reduce signal intensity) into a benefit by using it to create a protected state that selectively protects luminophores in specific spatial regions. The light that would normally cause damage is instead used to create a protective condition that enables high-resolution imaging with reduced overall photochemical load
3Object-affected harmful factors
If excitation-preventing light is used to protect luminophore, then bleaching risk is reduced, but additional light exposure is required
Solution Approach 1:
The patent merges the excitation-preventing light exposure with the existing STED imaging sequence by integrating it as a preliminary step. Rather than adding completely separate procedures, the excitation prevention is combined with the luminescence excitation and deactivation steps into a unified multi-step sequence that achieves both protection and imaging in a coordinated manner
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 method achieves high spatial resolution and contrast similar to STED while significantly reducing the risk of luminophore bleaching, by using excitation-preventing light to protect the luminophore from high-intensity excitation and de-excitation light, even with less sharp intensity distributions.
Implementation Method 1
The sample is exposed to excitation-preventing light before luminescence excitation, which converts the luminophore into a protected state that prevents electronic excitation by subsequent light
Implementation Method 2
The sample is exposed to luminescence excitation light in a measurement area, which excites the luminophore from an excitable electronic ground state to an excited luminescent state
Implementation Method 3
the sample is exposed to an intensity distribution of luminescence deactivation light having a local minimum in the measurement area, which returns the luminophore from the excited luminescent state to the excitable electronic ground state
Data Source
Figure 1(a)~1(d)
Figure 2
AI summary
In a method for the spatially high-resolved imaging of a structure (2) of a sample (3) that has a luminophore (1), the sample (3) is subjected to luminescence excitation light (7) in a measurement range (5), which luminescence excitation light(7) excites the luminophore (1) from an excitable electronic basic state into an excited luminescent state. The sample (3) is subjected to a intensity distribution of luminescence damping light (8) in the measurement range (5), the intensity distribution having a local minimum (9), and the luminescence damping light returning the luminophore (1) from the excited luminescent state into the excitable electronic basic state. Luminescence light (10) emitted from the measurement range (5) is recorded and is assigned to the position of the local minimum (9) in the sample (3). Prior to being subjected to the luminescent excitation light (7), the sample (3) is subjected to an intensity distribution of excitation prevention light (4) in the measurement range (5), which excitation prevention light transfers the luminophore (1) from the excitable electronic basic state into a protected state, in which the luminophore (1) is protected against electronic excitations from the luminescence excitation light (7) and the luminescence damping light (8). The intensity distribution of the excitation prevention light (4) has a local minimum (6), which overlaps with the local minimum (9) of the intensity distribution of the luminescence damping light (8).