qPCR Fluorescence Correction via Bubble Volume Quotient
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Solution Overview
Problem
Conventional qPCR methods face inaccuracies and fluctuations due to baseline drift, thermal noise, reagent concentration fluctuations, and bubble formation in the reaction chamber, leading to incorrect sigmoidal curve fitting and CT value determination.
Innovation Solution
The method involves determining reaction efficiency after each PCR cycle by imaging the reaction chamber and calculating a bubble volume quotient to correct fluorescence intensity values, resulting in an idealized qPCR curve that accounts for varying amplification factors, thereby improving curve evaluation and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple parallel measurements are carried out to improve accuracy through averaging, then measurement precision improves, but loss of time increases
Solution Approach 1:
The patent applies preliminary action by performing baseline correction and reaction efficiency determination at the beginning of the measurement process. The system determines reaction efficiency from early cycles and uses this information to correct subsequent intensity values, thereby achieving accurate single-measurement evaluation without requiring multiple parallel measurements for averaging.
2Measurement precision
If conventional qPCR methods are used without correction, then device complexity remains low, but measurement precision deteriorates due to artifacts
Solution Approach 1:
The patent implements feedback by using the determined reaction efficiency to continuously correct intensity values throughout the qPCR process. The system monitors the actual amplification efficiency and feeds this information back into the calculation of corrected intensity values for each cycle, improving measurement precision while maintaining relatively simple device architecture.
Solution Approach 2:
The patent replaces complex mechanical or procedural corrections with a computational approach. Instead of physically adjusting the system or performing multiple measurements, the invention uses mathematical correction of intensity values based on determined reaction efficiency, substituting mechanical complexity with algorithmic processing.
3Measurement precision
If reaction efficiency variations are not corrected, then ease of operation is maintained, but measurement precision deteriorates
Solution Approach 1:
The patent applies self-service by enabling the system to automatically determine its own reaction efficiency from the measurement data and use this information to correct its own intensity values. The qPCR system performs self-diagnosis and self-correction without requiring external intervention or complex manual adjustments, thereby maintaining ease of operation while improving precision.
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 enhances the accuracy of qPCR curve analysis by correcting for reaction efficiency variations, reducing the impact of bubbles and other artifacts, and allows for more precise determination of the CT value and starting concentration of DNA strands.
Implementation Method 1
at least some of the nucleotides are provided with fluorescent molecules which, upon binding to the individual strand of the DNA strand segment to be detected, activate a fluorescence property
Data Source
AI summary
The disclosure relates to a method for operating a quantitative polymerase chain reaction (qPCR) method, having the following steps: cyclically carrying out qPCR cycles; measuring the fluorescence in each qPCR cycle in order to obtain a qPCR curve of intensity values; determining the reaction efficiency (η) for each cycle; correcting the intensity value of each cycle on the basis of the reaction efficiency (η) determined for the cycle in question in order to obtain a corrected qPCR curve; and operating the qPCR method on the basis of the corrected qPCR curve.