Automated Isothermal Titration Microcalorimeter for Reduced Protein Consumption
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Solution Overview
Problem
Current isothermal titration calorimetry (ITC) systems face limitations in throughput and require significant operator skill and preparation time, especially due to the need for high protein amounts and complex manual handling procedures.
Innovation Solution
An automated isothermal titration micro calorimetry system with reduced cell volume, parallel washing and refilling capabilities, and automated sample handling, which significantly reduces the time required for each titration experiment and allows for unattended operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual handling procedures are used in conventional ITC systems, then operator control and flexibility are maintained, but significant operator skill and preparation time are required
Solution Approach 1:
The system performs automatic sample handling, cell filling, and titration operations without requiring manual intervention. The automated pipetting system fills cells and injects titrant automatically, eliminating the need for operator skill in delicate filling operations and manual needle placement
Solution Approach 2:
Manual mechanical operations are replaced with an automated mechanical system. The automated pipetting system with motorized control replaces manual pipette filling and needle insertion, converting operator-dependent manual operations into automated mechanical processes
2Reliability
If conventional ITC systems are used, then reliable binding data results are obtained, but the amount of protein required is high (0.1 mg to 1.0 mg)
Solution Approach 1:
The system divides the measurement process into multiple sequential titration injections, where small volumes of titrant are added step-by-step to the sample cell. This segmentation allows accurate measurement of binding events with progressively smaller total protein amounts required
Solution Approach 2:
The system changes the measurement parameters by using automated precise volume delivery and improved heat flow detection sensitivity, enabling reliable binding data acquisition with lower protein concentrations while maintaining measurement accuracy
3Reliability
If conventional ITC systems are used, then complete titration measurements can be performed, but the throughput is limited due to the time required for each measurement
Solution Approach 1:
The automated system performs continuous titration injections without interruption between steps. The motorized pipetting system automatically sequences multiple injections in rapid succession, eliminating idle time between manual operations and maintaining continuous measurement action
Solution Approach 2:
The system prepares and loads multiple titrant volumes in advance into the automated pipetting system before beginning the titration series. This preliminary preparation eliminates setup time between injections and enables rapid sequential measurements, increasing overall throughput
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 automated system achieves higher throughput, reduces the amount of protein needed for experiments, and enables the evaluation of a large number of samples, making it suitable for screening-type experiments and improving the efficiency of drug discovery processes.
Implementation Method 1
Microcalorimeters are typically two cell instruments in which properties of a dilute solution of test substance in an aqueous buffer in a sample cell are continuously compared to an equal quantity of aqueous buffer in a reference cell. Measured differences between the properties of the two cells, such as temperature or heat flow, are attributed to the presence of the test substance in the sample cell.
Implementation Method 2
One type of microcalorimeter is an isothermal titration calorimeter. The isothermal titration calorimeter (ITC) is a differential device, but operates at a fixed temperature and pressure while the liquid in the sample cell is continuously stirred.
Data Source
AI summary
Automated isothermal titration micro calorimetry (ITC) system comprising a micro calorimeter with a sample cell and a reference cell, the sample cell is accessible via a sample cell stem and the reference cell is accessible via a reference cell stem. The system further comprises an automatic pipette assembly comprising a syringe with a titration needle arranged to be inserted into the sample cell for supplying titrant, the pipette assembly comprises an activator for driving a plunger in the syringe, a pipette translation unit supporting the pipette assembly and being arranged to place pipette in position for titration, washing and filling operations, a wash station for the titrant needle, and a cell preparation unit arranged to perform operations for replacing the sample liquid in the sample cell when the pipette is placed in another position than the position for titration.