Confocal Microscope Polarization Analysis for Single Particles
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Solution Overview
Problem
Current optical analysis techniques using confocal microscopes struggle to detect and analyze the polarization characteristics of light-emitting particles at concentrations below the levels required for statistical significance, limiting the detection of individual particles and their characteristics in sample solutions.
Innovation Solution
An optical analysis device and method that uses a confocal or multiphoton microscope with a moving light detection region to individually detect and analyze the polarized light components of light-emitting particles, allowing for the computation of polarization characteristics without the need for statistical processing of fluorescence intensity fluctuations, even at low concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If statistical processing of fluorescence intensity fluctuations is used (FCS, FIDA), then measurement precision is improved, but the concentration of light-emitting particles must be above a certain threshold to achieve statistical significance
Solution Approach 1:
The invention segments the measurement approach by detecting individual particle events separately rather than relying on statistical aggregation. Each particle's fluorescence intensity fluctuation is recorded as a discrete event, and the autocorrelation function is computed from these segmented data points, allowing precise measurement even at low concentrations where traditional statistical methods fail.
Solution Approach 2:
The invention introduces dynamic scanning of the detection region through the sample solution. By moving the detection volume dynamically and recording particle passage events over time, the system accumulates sufficient statistical information without requiring high instantaneous concentration. This dynamic approach transforms the measurement from a static concentration-dependent process to a time-integrated event-counting process.
2Reliability
If conventional optical analysis techniques are used, then detection capability is maintained, but sample volume and measurement time are excessive
Solution Approach 1:
The invention implements continuous scanning of the detection region through the sample solution throughout the measurement process. This continuous action allows the system to accumulate particle detection data continuously over time, improving detection reliability while reducing the total measurement time required compared to conventional batch analysis methods.
Solution Approach 2:
The invention replaces traditional mechanical sample handling and bulk measurement approaches with optical field-based detection. By using confocal microscopy to detect individual fluorescent particles in their natural state within the solution, the system eliminates the need for mechanical sample concentration or bulk processing, significantly reducing measurement time while maintaining detection capability.
3Measurement precision
If high concentration of light-emitting particles is used, then statistical significance is achieved, but the ability to detect individual particles and their polarization characteristics is lost
Solution Approach 1:
The invention segments the detection process to identify and analyze individual particle events separately. By detecting each particle's passage through the confocal volume as a discrete event and recording its fluorescence intensity fluctuations and polarization characteristics independently, the system maintains the ability to detect individual particles even when they are sparsely distributed in the solution.
Solution Approach 2:
The invention uses dynamic detection and tracking of individual particles as they pass through the scanning confocal volume. By continuously monitoring and recording the temporal profile of fluorescence intensity and polarization for each detected particle event, the system captures individual particle characteristics without requiring high concentration, thus resolving the contradiction between statistical significance and individual particle detection.
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
Enables the detection and analysis of polarization characteristics of light-emitting particles at significantly lower concentrations than traditional methods, allowing for precise identification and analysis of particles in small sample volumes with reduced sample requirements and measurement time.
Implementation Method 1
a particle to which an arbitrary light-emitting label has been attached, and the light emitted from a light-emitting particle may be fluorescence, phosphorescence, etc. emitted with excitation light radiation
Implementation Method 2
by dividing detected fluorescence into polarized light components and analyzing in two channels, it has been also possible to obtain the polarization characteristics of a target molecule
Data Source
AI summary
There is provided an optical analysis technique which observes a polarization characteristic of a light-emitting particle using the scanning molecule counting method using an optical measurement with a confocal microscope or a multiphoton microscope. In the inventive optical analysis technique, the light detection region is irradiated with excitation light consisting of predetermined polarized light component(s) and the intensity of at least one polarized light component of the light from the light detection region is detected with moving the position of the light detection region of the optical system in a sample solution; a signal of each light-emitting particle is detected individually in the intensity of at least one polarized light component; and based on the intensity of at least one polarized light component of the signal of the detected light-emitting particle, the polarization characteristic value of the light-emitting particle is computed.