Blotless Cryo-TEM Sample Preparation via Hydrophilic Porous Material Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cryogenic transmission electron microscopy (cryo-TEM) sample preparation methods, particularly blotting-based techniques, suffer from poor repeatability, significant sample waste, and prolonged sample preparation times, which hinder high-throughput imaging and result in inefficient use of valuable biomacromolecule samples.
Innovation Solution
A blotless technique involving a hydrophilic porous material that is loaded with a fluidic sample and brought into contact with a hydrophilic TEM substrate, allowing sample transfer and vitrification without excess volume removal, utilizing a synchronized motion to plunge the substrate into a cryogen for efficient sample preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If blotting-based techniques are used for cryo-TEM sample preparation, then sample volume can be reduced, but repeatability deteriorates and sample waste increases
Solution Approach 1:
The invention extracts and removes the blotting step from the traditional cryo-TEM sample preparation workflow. By eliminating the blotting process, the method avoids the repeatability issues and sample waste associated with manual or automated blotting, while still achieving appropriate sample volume reduction through direct vitrification of the applied sample
Solution Approach 2:
The invention performs preliminary optimization of sample application parameters (volume, speed, temperature) before vitrification. By optimizing these parameters in advance and using automated dispensing, the method ensures consistent sample volumes are applied to each grid, eliminating the need for subsequent blotting and improving repeatability
2Quantity of substance
If blotting-based techniques are used for cryo-TEM sample preparation, then sample volume can be controlled, but preparation time increases
Solution Approach 1:
The invention removes the time-consuming blotting step from the sample preparation workflow. By directly applying the optimized sample volume and proceeding to vitrification without intermediate blotting, the method significantly reduces preparation time while maintaining control over sample volume through automated dispensing parameters
Solution Approach 2:
The invention creates a continuous workflow where sample application and vitrification are performed in sequence without interruption or intermediate steps. The automated system maintains continuous operation from sample dispensing through grid plunging, eliminating idle time and manual intervention associated with traditional blotting methods
3Ease of manufacture
If traditional blotting methods are used, then sample can be prepared for imaging, but sample waste increases significantly
Solution Approach 1:
The invention extracts and eliminates the blotting process that causes significant sample waste. By removing this step, the method preserves valuable biomacromolecule samples while still achieving proper sample thickness for imaging through optimized application parameters and direct vitrification
Solution Approach 2:
The invention changes the critical parameters of sample application (volume, dispensing speed, temperature, humidity) to optimize the amount of sample used. By precisely controlling these parameters, the method achieves appropriate sample thickness for imaging with minimal sample consumption, eliminating the excessive sample removal required by blotting
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 method reduces sample waste, enhances repeatability, and minimizes preparation time, enabling more efficient cryo-TEM imaging with improved sample quality and throughput.
Implementation Method 1
introducing a fluid sample into the porous material where the sample wicks into the porous material and into contact and across the surface of the substrate
Implementation Method 2
plunging the substrate into a liquid cryogen for sample vitrification
Data Source
AI summary
A method includes introducing a fluidic sample into the void volume and onto the surface of a porous material, bringing the porous material into contact with a hydrophilic substrate compatible with a cryogenic Transmission Electron Microscope, separating the porous material from the substrate, and transferring a portion of the sample from the porous material to the substrate between their contact and separation.