Exogenous Control Microorganism with pH Indicator for PCR Validation
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Solution Overview
Problem
Current PCR kits lack effective controls for the nucleic acid extraction and amplification steps, particularly in non-specialized laboratories, leading to potential manipulation errors and difficulties in validating the correct progression of reaction steps, especially in agro-food and environmental diagnostics.
Innovation Solution
Incorporating an exogenous extraction and amplification control microorganism with a control DNA sequence, combined with a pH color indicator, to visually validate the extraction and amplification processes, ensuring correct handling and reaction progression without interfering with the enzymatic reaction or detection methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an exogenous control microorganism with control DNA sequence is incorporated to validate extraction and amplification steps, then the reliability of detection is improved, but the device complexity increases
Solution Approach 1:
The patent combines the exogenous control microorganism with the pH color indicator into a single integrated system. The control microorganism cells contain the control DNA sequence and are lyophilized with the pH indicator, allowing dual functionality (extraction validation + visual monitoring) in one component rather than separate controls
Solution Approach 2:
The exogenous control microorganism serves multiple functions: it validates the extraction step by releasing control DNA, validates the amplification step by producing detectable amplification products, and when combined with the pH indicator, also enables visual monitoring of reaction progression. This multi-functional approach reduces the need for separate control mechanisms
2Ease of operation
If a pH color indicator is used to visually validate reaction steps, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The pH color indicator is merged with the exogenous control microorganism in a lyophilized combination. This integration means the visual monitoring system is not an add-on but a combined feature, reducing overall kit complexity despite the added functionality
Solution Approach 2:
The patent utilizes pH-induced color changes of the indicator to provide visual feedback about reaction progression. The color transition from acid form to base form (or vice versa) allows operators to monitor extraction and amplification steps without complex instrumentation, enhancing ease of operation
3Measurement precision
If multiple separate controls are used to validate different reaction steps, then the measurement precision is improved, but the loss of time increases
Solution Approach 1:
The exogenous control microorganism is prepared in advance with the control DNA sequence incorporated into its genome. The cells are lyophilized with the pH indicator ready for use, so no additional preparation is needed during the test. The control is designed to work simultaneously with the target detection, eliminating sequential control steps
Solution Approach 2:
Multiple validation functions (extraction control, amplification control, visual monitoring) are merged into a single exogenous control system rather than using separate controls for each step. This consolidation allows all validations to occur in parallel during the same reaction time
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 solution provides a reliable method for validating each step of the PCR process, reducing errors and ensuring accurate detection of target microorganisms by visually confirming the correct progression of extraction and amplification through color changes of the pH indicator, while maintaining non-toxicity and stability across various temperatures.
Implementation Method 1
a colored pH indicator
Data Source
Figure 1
AI summary
The invention relates to kits and methods for detecting a microorganism in a sample comprising an exogenous control for extraction and amplification as well as a colored pH indicator.