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Updated: Jun 23, 2026

A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

Published on: September 10, 2014

Chiral-Induced Spin Selectivity Modulated Time-Correlated Single-Photon Counting for DNA Hybridization Detection.

Neeraj Bangruwa¹, Mayank Tiwari¹, Ankur Shandilya²

¹Department of Physics and Astrophysics, University of Delhi, New Delhi 110007, India.

The Journal of Physical Chemistry Letters

|February 23, 2024

Summary

This summary is machine-generated.

The chiral-induced spin selectivity effect enhances DNA hybridization detection using quantum dots. This method shows a significant difference in excited-state lifetimes for hybridized DNA under magnetic fields.

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Area of Science:

Molecular Biophysics
Quantum Chemistry
Spectroscopy

Background:

Chiral-induced spin selectivity (CISS) effect influences electron spin dynamics in chiral molecules.
Quantum dots (QDs) are sensitive optical probes for molecular interactions.
DNA hybridization detection is crucial for diagnostics and molecular biology.

Purpose of the Study:

To investigate the application of the CISS effect in time-correlated single-photon counting (TCSPC) for DNA hybridization detection.
To explore magnetic field-dependent Fourier transform infrared (FTIR) spectroscopy for dsDNA detection.

Main Methods:

Utilizing quantum dots attached to DNA strands for TCSPC measurements.
Applying external magnetic fields to observe changes in QD excited-state lifetimes.
Employing FTIR spectroscopy under magnetic field conditions to analyze dsDNA presence.

Main Results:

Observed a significant variation in QD excited-state lifetimes with applied magnetic field direction for hybridized DNA.
Demonstrated a 130-fold increase in the difference of nonradiative decay lifetime for dsDNA compared to single-strand DNA.
Established magnetic field-dependent FTIR spectroscopy as a viable method for dsDNA detection.

Conclusions:

The CISS effect, combined with TCSPC and QDs, offers a sensitive method for detecting DNA hybridization.
Magnetic field modulation provides a novel approach for enhancing spectroscopic detection of dsDNA.