Microfluidic UV Quantification for In Situ DNA/RNA Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional UV spectrophotometry for nucleic acid quantitation requires sample transfer to a dedicated spectrophotometer, is prone to contamination, and is influenced by factors like buffer salts and pH changes, making it cumbersome and inaccurate for dilute samples.
Innovation Solution
Microfluidic apparatuses with integrated UV measurement regions and microfluidic driver apparatuses that allow in situ quantification of polynucleotides, correcting for reagent and temperature variations, and enabling automated control of biochemical processes to standardize and optimize RNA/DNA production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional UV spectrophotometry is used for nucleic acid quantitation, then measurement capability is provided, but sample transfer is required which increases contamination risk and operational complexity
Solution Approach 1:
The patent integrates the UV spectrophotometer directly into the microfluidic device, merging the measurement function with the sample processing platform. This eliminates the need for manual sample transfer between separate devices, reducing contamination risk while maintaining quantitation accuracy.
Solution Approach 2:
The microfluidic device serves multiple functions: it performs biochemical reactions, houses multiple samples, and includes an integrated UV spectrophotometer for quantitation. This multi-functionality eliminates the need for separate measurement equipment and manual sample handling.
2Measurement precision
If traditional UV spectrophotometry is used, then nucleic acid concentration can be measured, but minimum sample volumes of 1-75 μL are required which is problematic for dilute samples
Solution Approach 1:
The device nests multiple micro-scale sample chambers within a single integrated platform, allowing multiple small-volume samples to be processed simultaneously. This nesting approach enables accurate measurement of dilute samples in volumes far smaller than the traditional 1-75 μL requirement.
Solution Approach 2:
The patent changes the measurement parameters by using an integrated optical system with enhanced sensitivity that can accurately quantify nucleic acids in sub-microliter volumes. This parameter change allows precise concentration determination even in highly dilute samples with volumes much smaller than traditional requirements.
3Measurement precision
If UV spectrophotometry is used for quantitation, then nucleic acid concentration is measured, but contamination from proteins, RNA, and buffer salts falsely elevates concentration estimations
Solution Approach 1:
The patent extracts the measurement function into a dedicated integrated UV spectrophotometer within the microfluidic device, allowing for controlled measurement conditions. This extraction enables selective quantitation of nucleic acids while minimizing interference from contaminants through integrated sample preparation and measurement protocols.
Solution Approach 2:
The integrated microfluidic system acts as an intermediary between sample preparation and measurement, providing a controlled environment that separates nucleic acid quantitation from contaminating substances. The system enables selective detection while minimizing false elevations from proteins, RNA, and buffer salts.
4Measurement precision
If fluorescent probes are used as an alternative to spectrophotometry, then measurement capability is provided, but further sample handling and labeling are required which increases cost and complexity
Solution Approach 1:
The patent replaces the complex fluorescent probe labeling mechanism with a direct UV spectrophotometric measurement system. This substitution eliminates the need for fluorescent labeling chemistry and associated sample handling steps, reducing both device complexity and operational complexity while maintaining detection capability.
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
Enables accurate, automated, and efficient quantification of RNA/DNA concentrations within microfluidic cartridges, reducing manual handling and contamination risks, and allowing for real-time process control and standardization of therapeutic polynucleotide production.
Implementation Method 1
UV light is passed through the sample at a specified path length, and the absorbance of the sample at specific wavelengths is measured. Absorbance at 260 nm (A260) is often used to measure nucleic acid. Nucleic acids (e.g., DNA or RNA) contain conjugated double bonds in their purine and pyrimidine rings that have a specific absorption peak at about 260 nm.
Data Source
AI summary
Microfluidic apparatuses (e.g., systems, devices, etc.) and methods for microfluidic provide detection of polynucleotide concentration. These apparatuses may include removable, single-use or reusable microfluidic members that may include one or more channels, chambers and/or substrates for performing microfluidic maneuvers and are adapted for detection of polynucleotide concentration. For example, the microfluidic member may be a microfluidic cartridge that may be inserted, held and/or seated in a microfluidic driver apparatus that may oversee and control operations within one or more cartridges based in part on the detected concentration of polynucleotide.