SDA-Enhancing Azo Compounds for Illuminated Reaction Signal Detection
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Solution Overview
Problem
In illuminated reactions, especially those involving fluorescent or fluorogenic reactants, challenges arise from high background noise and photo-induced damage, which hinder the detection of specific events and reduce the accuracy of signal detection assays, particularly in single-molecule sequencing reactions.
Innovation Solution
The use of signal detection assay (SDA)-enhancing agents, which include compounds with an azo group of the formula Ra—N═N—Rb, where Ra and Rb comprise aromatic moieties and a hydrophilic moiety, to increase the signal-to-noise ratio (SNR) and provide photoprotection by reducing background noise and mitigating photo-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescent labeling groups are used to enable optical detection, then signal detectability is improved, but background noise increases and photo-induced damage occurs
Solution Approach 1:
The patent introduces an intermediary substance that mediates between the fluorescent label and the harmful effects. This intermediary absorbs or dissipates the harmful photo-induced energy while allowing the fluorescent signal to pass through, thereby reducing background noise and photodamage while maintaining signal detectability
Solution Approach 2:
The patent converts the harmful photo-induced energy that causes background noise and damage into a beneficial effect. By using substances that absorb this energy and re-emit it as useful fluorescent signal or dissipate it harmlessly, the previously harmful radiation becomes a controlled part of the detection process that enhances rather than degrades signal quality
2Reliability
If excess reactants are used to compensate for photo-induced damage, then detection reliability is improved, but reaction complexity and cost increase
Solution Approach 1:
The patent applies beforehand cushioning by introducing protective substances into the reaction mixture prior to illumination. These substances preemptively absorb or neutralize photo-induced damage before it can affect the reactants, thereby maintaining detection reliability without requiring excess reactants
3Measurement precision
If prolonged illumination is used to enhance signal intensity, then signal-to-noise ratio is improved, but photo-induced damage increases
Solution Approach 1:
The patent converts the harmful prolonged illumination into a beneficial effect by using substances that absorb the excess photo energy and re-emit it as useful fluorescent signal or dissipate it as harmless heat. This allows prolonged illumination to be used for enhancing signal-to-noise ratio while the previously harmful energy is transformed into a protective or useful mechanism
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
These agents enhance the detectability of signals by increasing the intensity of the optical signal and reducing background noise, while also protecting reaction components from photobleaching, thereby improving the accuracy and duration of data acquisition in illuminated reactions.
Implementation Method 1
The use of signal detection assay (SDA)-enhancing agents, which include compounds with an azo group of the formula Ra—N═N—Rb, where Ra and Rb comprise aromatic moieties and a hydrophilic moiety, to increase the signal-to-noise ratio (SNR) and provide photoprotection by reducing background noise
Implementation Method 2
These agents enhance the detectability of signals by increasing the intensity of the optical signal and reducing background noise, while also protecting reaction components from photobleaching, thereby improving the accuracy and duration of data acquisition in illuminated reactions
Implementation Method 3
The fluorescence detected in a fluorescence-based optical assay is the result of a three-stage process that occurs in the fluorophores or fluorescent dyes present in a reaction mixture. The first stage is excitation in which a photon with quantized energy from an external light source having a specific wavelength (e.g., from a laser) is supplied and absorbed by a fluorophore creating an excited electronic singlet state (S1′). The second stage is the excited-state lifetime in which the excited fluorophore undergoes several different changes to relax its energy to the lowest singlet state (S1). From the S1 state several possible mechanisms can occur in the third stage, fluorescence, in which a photon of energy (S1-S0) is emitted returning the fluorophore to its ground state.
Data Source
AI summary
Compositions, devices, systems and methods for increasing the signal to noise ratio (SNR) and/or enhancing photoprotection in an illuminated analytical reaction by addition of one or more signal detection assay (SDA)-enhancing agents to the reaction mixture.