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Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline

Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline

Published on: January 5, 2017

Sub-millisecond time-resolved SAXS using a continuous-flow mixer and X-ray microbeam.

Rita Graceffa¹, R Paul Nobrega, Raul A Barrea

¹BioCAT, CSRRI and Department BCS, Illinois Institute of Technology, 3101 South Dearborn, Chicago, IL 60616, USA.

Journal of Synchrotron Radiation

|October 15, 2013

Summary

This study introduces micro-small-angle X-ray scattering (micro-SAXS) combined with microfluidics for sub-millisecond resolution studies of dynamic molecular processes. The new apparatus enables detailed investigation of rapid structural changes in soft matter, like protein folding.

Keywords:

micro-SAXS protein folding time-resolved

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Area of Science:

Soft matter physics
Biophysics
Materials science

Background:

Small-angle X-ray scattering (SAXS) is crucial for nanoscale structure analysis in soft matter.
Microfluidics enables studying native biological samples and dynamic processes.
Previous time resolution was limited by X-ray beam size.

Purpose of the Study:

To develop a micro-SAXS system with microfluidics for sub-millisecond time-resolved studies.
To overcome limitations of X-ray beam size in SAXS experiments.
To investigate rapid molecular dynamics and reaction kinetics.

Main Methods:

Development of a Kirkpatrick-Baez mirror-based microbeam system for SAXS.
Integration with microfluidic turbulent flow mixers for continuous sample delivery.
High-duty-cycle scanning and microsecond time-resolution data acquisition.

Main Results:

Successful development of a micro-SAXS instrument at the BioCAT beamline 18ID.
Demonstrated capability for studying rapid structural dynamics, exemplified by cytochrome c folding.
Detailed description of the instrument, mixer, and data analysis software.

Conclusions:

The developed micro-SAXS system offers unprecedented time resolution for soft matter studies.
This technique is a powerful tool for investigating dynamic processes at the molecular level.
Future applications include real-time analysis of complex biological and material systems.