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Related Concept Videos

Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...

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Related Experiment Video

Updated: Jun 11, 2026

Microfluidic Mixers for Studying Protein Folding
12:42

Microfluidic Mixers for Studying Protein Folding

Published on: April 10, 2012

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Rapid droplet-based mixing for single-molecule spectroscopy.

Tianjin Yang1, Karin J Buholzer2, Andrea Sottini2

  • 1Department of Biochemistry, University of Zurich, Zurich, Switzerland. t.yang@bioc.uzh.ch.

Nature Methods
|September 25, 2023
PubMed
Summary

This study introduces droplet-based microfluidic mixing for single-molecule spectroscopy, overcoming limitations of existing systems for studying biomolecular mechanisms. The new method effectively analyzes binding kinetics of surface-adhesive proteins on millisecond timescales.

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Area of Science:

  • Biophysics
  • Chemical Engineering
  • Molecular Biology

Background:

  • Single-molecule spectroscopy is crucial for understanding biomolecular mechanisms.
  • Existing microfluidic rapid-mixing systems face limitations with surface-adhesive molecules, flow dispersion, and fabrication complexity.

Purpose of the Study:

  • To develop an improved microfluidic mixing technique for single-molecule spectroscopy.
  • To overcome the limitations of current methods, particularly for surface-adhesive biomolecules.

Main Methods:

  • Introduction of a novel droplet-based microfluidic mixing system.
  • Application of the system to single-molecule spectroscopy experiments.
  • Demonstration with binding kinetics of surface-adhesive proteins.

Main Results:

  • The droplet-based system effectively overcomes limitations of previous microfluidic methods.
  • Robust functionality demonstrated for analyzing binding kinetics.
  • Successful measurement on the millisecond timescale, even for highly surface-adhesive proteins.

Conclusions:

  • Droplet-based microfluidic mixing offers a versatile solution for single-molecule spectroscopy.
  • This technique expands the applicability of single-molecule studies to challenging biomolecular systems.
  • Enables precise kinetic analysis of surface-adherent biomolecular interactions.