FCS Bleaching Threshold Control for Reliable Fluorescence Measurement
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Solution Overview
Problem
Existing fluorescence correlation spectroscopy (FCS) methods suffer from undesired bleaching effects due to immobile molecules, which are difficult to manage with user-dependent bleaching times or require complex mathematical filters, leading to inefficient and potentially falsified measurement results.
Innovation Solution
An FCS method that adapts excitation radiation parameters to the properties of fluorescent markers, continuously monitors intensity values during bleaching, and sets a threshold to initiate FCS measurement data acquisition, using a detector array to enhance sensitivity and automate bleaching management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If user-dependent bleaching times are used to bleach immobile molecules, then bleaching effects are reduced, but measurement time is unnecessarily lengthened and requires user experience
Solution Approach 1:
The system continuously monitors fluorescence intensity during the measurement process and uses this feedback to dynamically adjust the bleaching duration. The automated feedback mechanism eliminates the need for user experience in determining bleaching times while preventing unnecessary extension of measurement time through real-time intensity threshold detection.
Solution Approach 2:
The system performs self-adjustment by automatically detecting when sufficient bleaching has occurred through continuous intensity monitoring. The measurement system serves itself by autonomously determining the optimal bleaching duration without requiring external user intervention or experience-based timing.
2Object-affected harmful factors
If mathematical filters are used to remove bleaching effects from measurement data, then bleaching effects are reduced, but measurement data are changed and results may be falsified
Solution Approach 1:
The system performs bleaching as a preliminary action before acquiring FCS measurement data, rather than attempting to correct bleaching effects after data acquisition. By completing the bleaching process in advance and verifying its completion through intensity monitoring, the system prevents bleaching interference in the actual measurement data, maintaining result reliability.
3Object-affected harmful factors
If sufficient bleaching time buffer is selected to ensure complete bleaching, then bleaching effects are reduced, but FCS measurement process is unnecessarily lengthened
Solution Approach 1:
The system transitions from static, predetermined bleaching time buffers to dynamic, real-time bleaching monitoring. The bleaching duration is continuously adjusted based on actual fluorescence intensity changes, allowing the system to stop bleaching as soon as sufficient effect is achieved rather than relying on conservative time buffers, thereby improving measurement efficiency.
Solution Approach 2:
The system replaces the mechanical timing approach (fixed time buffers) with an optical detection approach (real-time intensity monitoring). By substituting temporal estimation with optical measurement, the system accurately determines when bleaching is sufficient without relying on excessive time buffers, improving productivity.
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
This approach improves the efficiency and standardization of FCS measurements by reducing unnecessary sample load and idle times, enhancing equipment utilization, and ensuring consistent data quality across different samples.
Implementation Method 1
The wavelength of the excitation radiation is chosen such that the sufficiently strongly illuminated molecules permanently lose their ability to emit fluorescence radiation, i.e. are bleached.
Implementation Method 2
Fluorescence radiation emitted due to the effect of the excitation radiation is detected as detection radiation
Data Source
AI summary
The invention relates to an FCS method in which a sample that is to be measured and has fluorescent markers is illuminated with excitation radiation over a bleaching time in order to bleach selected fluorescent markers; and after bleaching has been carried out over at least one measurement period, FCS measurement data of the sample are acquired by illuminating the sample with excitation radiation and by detecting detection radiation brought about by the excitation radiation. The invention is characterized in that during the bleaching time, intensity values of fluorescence radiation that has been brought about by the excitation radiation which is directed at the sample for bleaching purposes are continuously or repeatedly acquired and compared with a threshold value, and the acquisition of the FCS measurement data is started when the threshold value has been reached.