Cell Vitality Detection Using Electric-Field Fluorescence Response
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Solution Overview
Problem
Conventional methods for detecting cell vitality, such as culturing samples or using fluorescent dyes like Sytox®, require significant time delays and cannot differentiate between vital and non-vital cells effectively.
Innovation Solution
A method involving the application of an electric field across a sample containing fluorescent dyes that respond to membrane polarization changes, allowing rapid detection of vital cells by measuring fluorescence responses over time without electroporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional culturing methods are used to detect cell vitality, then reliable differentiation between vital and non-vital cells is achieved, but significant time delays occur (days before results are available)
Solution Approach 1:
The patent replaces the biological culturing process with a physical-electrical detection system. An electric field is applied to cells stained with fluorescent dyes, causing vital cells to exhibit characteristic fluorescence responses due to membrane polarization changes, while non-vital cells do not respond. This substitution of biological culturing with electro-optical detection achieves rapid results within seconds while maintaining reliable differentiation between cell states.
Solution Approach 2:
The patent changes the detection parameter from observing cell growth over days (culturing) to measuring fluorescence intensity responses to electric field application. By monitoring the dynamic fluorescence response of cells to applied electric fields, the system can rapidly distinguish vital cells (which show characteristic responses due to intact membrane polarization) from non-vital cells (which lack such responses), reducing detection time from days to seconds.
2Productivity
If high electric fields are applied to accelerate dye introduction, then detection speed increases, but electroporation of cells occurs which may damage cell membranes
Solution Approach 1:
The patent optimizes the electric field strength parameter to a specific range (10-1000 V/cm, preferably 50-500 V/cm) that is sufficient to accelerate dye uptake in vital cells through membrane polarization effects but remains below the threshold required to cause electroporation. This precise parameter control enables rapid detection while preserving cell membrane integrity and avoiding harmful effects.
Solution Approach 2:
The patent uses fluorescent dyes that copy or mimic the natural polarization state of cell membranes. The dyes respond to the electric field in the same way that the membrane potential itself would respond, allowing indirect measurement of membrane integrity and vitality without physically disrupting the membrane structure. This copying approach enables detection of membrane polarization effects without causing the actual membrane disruption that would occur at higher field strengths.
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 rapid and reliable differentiation between vital and non-vital cells in a sample, typically within seconds, using electric fields below 1 kV/cm to accelerate dye introduction selectively for vital cells.
Implementation Method 1
measuring a fluorescence response from the test volume over a period of time after applying the voltage
Implementation Method 2
a fluorescent dye that responds to a change in membrane polarization
Implementation Method 3
applying a voltage across the pair of electrodes to generate an electric field across the portion of the sample
Implementation Method 4
The electric field in typical applications may be less than 1 kV/cm. The aim in this case is not to open pores in the cell membrane, as with electroporation, but instead to preferentially accelerate introduction of the fluorescent dye for vital cells
Data Source
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AI summary
The disclosure relates to detecting cell vitality, i.e. determining whether cells are alive (vital) or dead (non-vital). Example embodiments disclosed include a method of detecting vitality of cells in a sample (101), comprising: providing a sample (101) comprising cells and a fluorescent dye; disposing a portion of the sample in a test volume (102) between a pair of electrodes; applying a voltage across the pair of electrodes to generate an electric field across the portion of the sample (101); illuminating the test volume; measuring a fluorescence response from the test volume over a period of time after applying the voltage across the pair of electrodes; and detecting cells in the sample to be vital dependent on a change in their fluorescence response over the period of time.