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Related Experiment Video

Updated: Jun 18, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Detection and quantification of DNA adsorbed on solid surfaces by using liquid crystals.

Chih-Hsin Chen1, Kun-Lin Yang

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576, Singapore.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 8, 2009
PubMed
Summary

This study introduces a novel label-free DNA detection method using liquid crystals (LCs). This technique requires minimal sample volume (<1 microL) and detects DNA via optical texture changes, offering a sensitive alternative to conventional spectrometry.

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Materials Science

Background:

  • Conventional DNA detection methods like UV-vis and fluorescence spectrometry typically require large sample volumes (>1 microL).
  • There is a need for sensitive, low-volume DNA quantification techniques suitable for various applications.

Purpose of the Study:

  • To develop and demonstrate a label-free, liquid-crystal (LC)-based DNA quantification method.
  • To characterize the performance of this new method in terms of sensitivity and sample volume requirements.

Main Methods:

  • Utilized surface-immobilized DNA to disrupt the orientation of liquid crystals (LCs).
  • Observed changes in LC optical textures, visible to the naked eye, for DNA detection.
  • Employed buffers containing divalent cations (e.g., calcium, magnesium) for successful detection.

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Last Updated: Jun 18, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Quantitative Detection of DNA-Protein Crosslinks and Their Post-Translational Modifications
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Quantitative Detection of DNA-Protein Crosslinks and Their Post-Translational Modifications

Published on: April 21, 2023

Main Results:

  • Achieved a limit of detection of approximately 4 microg/mL DNA.
  • Required only 10 nL of DNA solution, enabling detection of as little as 40 pg of DNA.
  • Demonstrated a label-free detection principle based on DNA-induced disruption of LC orientations.

Conclusions:

  • The developed LC-based method offers a sensitive and low-volume alternative for DNA quantification.
  • The method is simple to apply and shows potential for integration with lab-on-a-chip devices.
  • Divalent cations are essential for the successful operation of this LC-based DNA detection system.