Reverse Transcriptase Mix Coloring for Reagent Volume Confirmation
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Solution Overview
Problem
Existing molecular biology techniques fail to accurately detect variations in fluid volumes during reagent transfer, leading to inconsistent reaction results due to unnoticed discrepancies in reagent amounts, which are often transparent and difficult to track visually.
Innovation Solution
A reverse transcriptase mixture containing a colored dye at concentrations that do not inhibit enzyme activity is used to visually confirm the transfer and volume of reagents by observing the dye's presence, allowing for accurate tracking of reagent addition and transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small volumes of reagent are pipetted during multi-pipetting or single pipetting, then the reaction setup can be completed, but variable volumes of reagent are picked up and inserted into reaction tubes, affecting reaction outcomes
Solution Approach 1:
The patent applies color changes by incorporating a colored dye into the reagent mixture. This allows visual detection of the reagent's presence and volume during pipetting operations. The color provides immediate feedback to the operator about whether the correct volume has been transferred, resolving the contradiction between completing reactions efficiently and ensuring precise reagent volumes.
2Measurement precision
If detection methods are implemented to monitor fluid-fill variations, then volume accuracy can be improved, but the detection process may negatively impact the reaction
Solution Approach 1:
The colored dye enables simple visual detection without complex instrumentation that could contaminate or interfere with the reaction. The detection method is passive and non-invasive, maintaining reaction reliability while providing sufficient volume verification.
Solution Approach 2:
The use of a simple colored dye represents a low-cost, disposable detection approach that does not require expensive or complex detection equipment. The dye serves its detection purpose and can be discarded with the reaction mixture, avoiding contamination risks associated with reusable detection devices.
3Ease of operation
If colored dye is added to the reverse transcriptase mixture for visual detection, then reagent transfer can be confirmed by eye, but the dye concentration must not inhibit reverse transcriptase activity
Solution Approach 1:
The patent applies parameter changes by carefully optimizing the dye concentration to a specific range that provides sufficient visual detectability while remaining below the threshold for enzyme inhibition. This parameter optimization resolves the contradiction between ease of visual detection and maintenance of enzyme activity.
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
The colored dye enables reliable visual confirmation of reagent volumes and additions, ensuring consistent reaction outcomes by providing a simple, non-inhibitory method for tracking fluid volumes without the need for optical devices.
Implementation Method 1
combining an aliquot of a primary mix, wherein the primary mix comprises or consists of (i) the reverse transcriptase mixture or (ii) the cDNA synthesis mix described herein, with a first receiving mix containing a template single strand nucleic acid (e.g. RNA), to produce a cDNA reaction mix; (b) incubating the cDNA reaction mix to produce a cDNA product
Data Source
AI summary
Provided herein is a reverse transcriptase mixture comprising a reverse transcriptase and a colored dye at a concentration in the range of 0.003%-1% (v/w). The colored dye may be visually observed during transfer of the mix from one vessel to another and addition of the mix to another mix can be confirmed by eye by observing the colored dye.