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Gas-Assisted Annular Microsprayer for Sample Preparation for Time-Resolved Cryo-Electron Microscopy.

Zonghuan Lu1, David Barnard2, Tanvir R Shaikh3

  • 1Center for Integrated Electronics, Rensselaer Polytechnic Institute, Troy, NY 12180.

Journal of Micromechanics and Microengineering : Structures, Devices, and Systems
|December 23, 2014
PubMed
Summary
This summary is machine-generated.

A novel microfluidic sprayer enables rapid sample preparation for time-resolved cryo electron microscopy (TRCEM). This method optimizes droplet size for efficient freezing, significantly reducing sample consumption and data collection time.

Keywords:
Microfluidicscryo EMmicrodropletmicronozzlemicrospraymonolithic devicetime-resolved TEM

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Area of Science:

  • Structural Biology
  • Biophysics
  • Microfluidics

Background:

  • Time-resolved cryo electron microscopy (TRCEM) is crucial for studying transient biomolecular structures.
  • Microfluidic devices offer potential for improved TRCEM sample preparation, but sample transfer remains a challenge.
  • Optimizing droplet size for cryo-electron microscopy (EM) grids is critical for thin ice film formation and data quality.

Purpose of the Study:

  • To develop an advanced microfluidic device for efficient TRCEM sample preparation.
  • To address the challenge of transferring samples from microfluidic devices to EM grids.
  • To achieve optimized droplet size for cryo-EM grid preparation.

Main Methods:

  • Development of a novel monolithic 3D annular gas-assisted microfluidic sprayer using 3D MEMS fabrication.
  • Characterization of microspray droplet size and density.
  • Evaluation of ice film quality and data collection efficiency on EM grids.

Main Results:

  • The developed microsprayer produced dense, consistent sprays with an average droplet size of 6-9 μm.
  • Achieved droplet density of 12-18 per grid window and >50% data collectible thin ice region.
  • Collected ~800-1000 high-quality micrographs in 6-8 hours, comparable to conventional methods but significantly faster.

Conclusions:

  • The novel microfluidic sprayer effectively prepares samples for TRCEM, meeting critical droplet size requirements.
  • This technology drastically reduces sample volume and accelerates the data collection process.
  • The method offers a significant advancement for structural studies of biomacromolecular complexes.