Microfluidic Calorimeter Nanohole Array Temperature Detection
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Solution Overview
Problem
Current calorimetry methods in pharmaceutical research face limitations such as inadequate sensitivity, high protein requirements, long experiment times, and challenges with compounds of poor solubility, leading to inefficient drug development and potential loss of promising compounds.
Innovation Solution
A microfluidic calorimetry system utilizing stationary laminar flow and nanohole arrays in a metal film to detect temperature changes, allowing for precise measurement of enthalpy, entropy, and other thermodynamic parameters with reduced reagent volumes and improved experimental throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calorimetry methods are used, then detailed thermodynamic information can be obtained, but the amount of protein required is large (0.5mg to 5mg)
Solution Approach 1:
The invention segments the measurement process by using multiple discrete temperature sensors positioned at different locations within the calorimeter chamber. This segmentation allows for localized temperature monitoring that increases measurement precision while reducing the total protein amount needed, as the segmented sensing approach is more efficient at detecting thermal changes from smaller samples.
Solution Approach 2:
The invention transitions from bulk temperature measurement to spatially-resolved temperature mapping by implementing an array of temperature sensors at known positions. This dimensional approach to temperature detection enhances the information obtained per unit of protein, thereby reducing the required protein amount while maintaining detailed thermodynamic characterization.
2Measurement precision
If traditional calorimetry methods are used, then thermodynamic properties can be measured, but experiment run times are long (60 to 90 minutes)
Solution Approach 1:
The invention implements continuous temperature monitoring through multiple discrete sensors that simultaneously track thermal changes throughout the reaction. This continuous, parallel measurement approach eliminates the need for sequential measurements, thereby maintaining high measurement precision while dramatically reducing experiment run times.
Solution Approach 2:
By segmenting the temperature detection into multiple simultaneous measurement points rather than a single sequential measurement, the system obtains complete thermodynamic data faster, reducing the time required while maintaining measurement precision.
3Measurement precision
If traditional calorimetry methods are used, then binding interactions can be analyzed, but throughput is low due to sequential controls
Solution Approach 1:
The invention segments the control and measurement functions into multiple independent sensor channels that operate simultaneously. This segmentation allows parallel acquisition of control data and experimental data, eliminating the need for sequential control runs and thereby increasing throughput while maintaining the precision needed for binding interaction analysis.
4Measurement precision
If traditional calorimetry methods are used, then reaction thermodynamics can be measured, but sensitivity is inadequate for low enthalpy changes
Solution Approach 1:
The invention divides the temperature detection function into multiple discrete sensors distributed throughout the measurement chamber. This segmentation increases the overall sensitivity by distributing the detection burden across multiple independent measurement points, allowing for more reliable detection of small enthalpy changes while maintaining measurement precision.
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 sensitive and efficient calorimetry measurements with reduced reagent amounts, enhancing drug development by allowing earlier analysis of compounds and reducing the need for additional synthetic chemistry, thereby optimizing compound selection.
Implementation Method 1
Extraordinary optical transmission, a physical phenomenon, related to surface plasmon resonance, can be harnessed to produce an apparatus for determining temperature change of a chemical reaction occurring in microfluidic laminar flow.
Implementation Method 2
Extraordinary optical transmission, a physical phenomenon, related to surface plasmon resonance, can be harnessed to produce an apparatus for determining temperature change of a chemical reaction occurring in microfluidic laminar flow.
Implementation Method 3
since the reaction and diffusion regions are stationary in space, which implies that the heat released at a location along the channel should remain constant for the duration of the test, the collected data can be integrated over time to reduce noise and error in the data.
Data Source
Figure 1~2
Figure 3
Figure 4a~4b
AI summary
Apparatus and method for measuring the enthalpy of reactions. A dose (bolus) of a reactant is injected into a micro-fluidic device (106) where the dose reacts with a second fluid. Calorimetry measurements are made via changes in the extraordinary optical transmission through an array of nano-holes (114).