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Nuclear Overhauser Enhancement (NOE)

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...

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Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

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Spin Dynamics and Ionic Strength Sensitivity in Nitroxide-Doped Micelles.

Christian A Totoiu¹, Arshiyan A Laaj¹, Nathanael P Kazmierczak¹

¹Division of Chemistry and Chemical Engineering, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, United States.

The Journal of Physical Chemistry Letters

|November 14, 2025

Summary

Molecular spin qubits in micelles show sensitivity to salt concentration, offering a new way to study biological interfaces. This quantum sensing approach reveals insights into chemical environments.

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Published on: August 18, 2012

Area of Science:

Molecular quantum information science
Quantum sensing
Biophysics

Background:

Paramagnetic spin qubits are promising for quantum sensing and probing biological systems.
Understanding relaxation and decoherence dynamics is crucial for correlating quantum observables with chemical parameters.

Purpose of the Study:

To investigate relaxation and decoherence dynamics of spin qubits near biological interfaces.
To assess the sensitivity of spin relaxation to ionic strength in a biological model system.

Main Methods:

Doping a nitroxide spin-labeled phospholipid into Triton X-100 micelles.
Measuring spin-lattice relaxation (T1) at low temperatures (5-80 K).
Varying KCl concentration (0-500 mM) to simulate physiological conditions.

Main Results:

The spin-lattice relaxation mechanism varied in micelles compared to nonmicelle controls.
Relaxation rates were sensitive to KCl concentration, decreasing with increasing salt.
T1 relaxometry showed significantly higher sensitivity (30%) to KCl compared to pyrene fluorescence (<1%).

Conclusions:

This study provides a proof-of-concept for investigating interfacial relaxation dynamics using spin qubits in biological systems.
Spin relaxation demonstrates sensitivity to ionic strength, offering a novel quantum observable for probing biological microenvironments.