Electrochemical Reaction Fluidics With Stable Reference Voltage
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Solution Overview
Problem
Existing electrochemical detection systems face challenges such as unstable reference voltage, variability in reagent delivery, mixing of reagents, temperature fluctuations, and electrical interference, which affect the quality of signals, especially under low signal conditions.
Innovation Solution
The system provides a stable reference voltage through a reaction flow chamber using a fluid-fluid interface for electronic sensors, delivers reagents sequentially, and uses a floating gate ion-sensitive field-effect transistor array to reduce noise, while correlating time delays in output signals to locate analytes in microwells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reference electrode is used in conventional electrochemical detection systems, then reference voltage is provided to electronic sensors, but the reference voltage becomes unstable due to contact with multiple reagents and fluid potential changes
Solution Approach 1:
The system segments the sensor array into multiple independent blocks, each with its own local reference electrode and electrolyte reservoir. This segmentation isolates each reference electrode from the main reagent flow, preventing contamination and voltage instability while maintaining system functionality through modular architecture.
Solution Approach 2:
A bridge electrolyte solution acts as an intermediary between the reference electrode and the reaction environment. This bridge electrolyte provides a stable ionic pathway for voltage reference without exposing the reference electrode to varying reagents, thereby maintaining voltage stability while isolating the reference system from complex fluid dynamics.
2Productivity
If multiple reagents are delivered to microwells containing analytes, then chemical reactions can be performed, but reagent mixing and variable delivery amounts occur affecting signal quality
Solution Approach 1:
The system uses separate fluidic channels for delivering different reagents to microwells, preventing mixing before delivery. Each reagent stream is independently controlled and delivered sequentially or simultaneously without cross-contamination, ensuring precise delivery amounts and maintaining signal quality while enabling multiple reactions.
Solution Approach 2:
Reagents are delivered in periodic cycles with controlled timing and sequencing. The system alternates between delivering different reagents to different microwell groups, allowing reactions to proceed in a controlled temporal sequence that prevents mixing while maintaining high throughput through parallel processing.
3Measurement precision
If electronic sensors monitor reactions in microwells, then detection sensitivity is improved, but noise from electrical interference and temperature fluctuations increases
Solution Approach 1:
The sensor array is divided into independent blocks with localized reference electrodes, isolating each sensor's electrical environment from external interference. This segmentation reduces cumulative noise and allows independent optimization of each sensor's electrical shielding and temperature control.
Solution Approach 2:
The system incorporates real-time monitoring of temperature and electrical potential variations using the reference electrodes and associated sensors. This feedback information is used to compensate for environmental noise in the measured signals, maintaining high detection sensitivity despite external interference through active correction algorithms.
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 signal stability and accuracy by minimizing noise and interference, allowing for precise detection and monitoring of multiple reactions in parallel, particularly in applications like DNA sequencing.
Implementation Method 1
uses a floating gate ion-sensitive field-effect transistor array to reduce noise
Implementation Method 2
provides a stable reference voltage through a reaction flow chamber using a fluid-fluid interface for electronic sensors
Data Source
AI summary
An apparatus includes a reaction vessels coupled to an electronic sensor for monitoring a reaction product in the reaction vessel; a fluidics system for sequentially delivering a plurality of reagents to the reaction vessel, the fluidics system including a plurality of reagent reservoirs in fluidic communication via a plurality of flow paths with a fluidics circuit and to a common passage in fluidic communication between the fluidics circuit and the reaction vessel, a solution reservoir in fluidic communication with the common passage via a branch passage connected with the common passage at a junction between the fluidics circuit and the reaction vessel; and an electrode in contact with a solution within the branch passage, the electrode being in electrical communication with the reaction vessel through fluid extending from the branch passage and through the common passage, the electronic sensor generating an output signal depending on a voltage of the electrode.