Microfluidic Chip for Time-Resolved Cryo-EM Sampling
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Solution Overview
Problem
Current methods for time-resolved Cryo-EM sampling face challenges in achieving fast mixing, accurate droplet generation, and low sample consumption while maintaining high time resolution, with existing approaches consuming large sample volumes and lacking control over droplet dimensions and reaction timing.
Innovation Solution
A microfluidic chip with a droplet-on-demand system for fast mixing and controlled droplet generation, combined with a plunger module for rapid vitrification, allowing for low sample consumption and precise control over reaction delay times, enabling millisecond time-resolution sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If rapid mixing and droplet spraying are used for time-resolved Cryo-EM sampling, then time resolution is improved, but sample consumption increases
Solution Approach 1:
The continuous flow system is segmented into discrete droplets that are generated on-demand and sprayed onto the grid. This segmentation allows precise control over the amount of sample deposited while maintaining rapid sampling rates, resolving the contradiction between fast time resolution and excessive sample consumption.
Solution Approach 2:
The system uses periodic droplet generation and spraying cycles to achieve time-resolved sampling. By controlling the frequency and timing of droplet ejection, the system captures temporal dynamics of biological processes while minimizing total sample usage compared to continuous spraying methods.
2Productivity
If automated droplet generation is used, then sampling speed is improved, but control over droplet dimensions deteriorates
Solution Approach 1:
The automated droplet generation system incorporates feedback control mechanisms that monitor droplet formation and adjust parameters in real-time to maintain consistent droplet dimensions. This feedback loop enables high-speed automated sampling while preserving precise control over droplet size and uniformity.
Solution Approach 2:
The system replaces manual mechanical droplet handling with an automated piezoelectric or electrostatic droplet generation mechanism. This substitution enables precise electronic control over droplet formation, size, and timing, achieving both high sampling speed and accurate dimension control that cannot be obtained through manual methods.
3Loss of time
If fast mixing is implemented, then reaction timing control is improved, but device complexity increases
Solution Approach 1:
The system merges the mixing function and droplet generation function into a single integrated microfluidic device. By combining these operations in one compact unit with integrated channels and chambers, the system achieves fast mixing and precise reaction timing control without the complexity of separate, coordinated systems.
Solution Approach 2:
The device uses three-dimensional microfluidic channel designs and vertical layering of functional components to achieve fast mixing through enhanced fluid dynamics. This dimensional optimization allows rapid reaction initiation and timing control while keeping the device footprint compact and manageable, avoiding the complexity of large-scale systems.
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 solution enables efficient preparation of Cryo-EM samples with minimal protein amounts, achieving high-resolution structural analysis by combining fast mixing, controlled droplet generation, and rapid vitrification, thereby improving the time-resolution and reducing sample consumption.
Implementation Method 1
mixing of said aqueous solutions within said droplets while flowing through the oil continuous phase in the channel in the chip
Implementation Method 2
droplet-on-demand generation of airborne droplets from the mixed aqueous solutions in the nozzle of the chip
Implementation Method 3
the cryo-EM sample is prepared by rapid plunge freezing of the grid in cryogen (usually liquid ethane) after a specified reaction delay time
Data Source
AI summary
The present invention relates to the field of time-resolved protein sampling, more specifically for use in structural biology, even more specifically for structural analysis of proteins by Cryogenic-electron microscopy (Cryo-EM). The invention provides for methods and devices for preparing vitrified samples for transmission electron microscopy at millisecond time-resolution using a microfluidics-based integrated device. More specifically, the sampling means and methods combine fast mixing with a tunable droplet-on-demand generation to control droplet formation, spraying and sampling velocity, resulting in a sampling method requiring very limited protein amounts.