Hydration effect on the intrinsic magnetism of natural deoxyribonucleic acid as studied by EMR spectroscopy and SQUID measurements

Young Wan Kwon, Hoon Lee Chang, Eui Doo Do, Dong Hoon Choi, Jung Il Jin, Sung Kang Jun, Eui Kwan Koh

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The hydration effect on the intrinsic magnetism of natural salmon double-strand DNA was explored using electron magnetic resonance (EMR) spectroscopy and superconducting quantum interference device (SQUID) magnetic measurements. We learned from this study that the magnetic properties of DNA are roughly classified into two distinct groups depending on their water content: One group is of higher water content in the range of 2.6-24 water molecules per nucleotide (wpn), where all the EMR parameters and SQUID susceptibilities are dominated by spin species experiencing quasi one-dimensional diffusive motion and are independent of the water content. The other group is of lower water content in the range of 1.4-0.5 wpn. In this group, the magnetic properties are most probably dominated by cyclotron motion of spin species along the helical π-way, which is possible when the momentum scattering time (τk) is long enough not only to satisfy the cyclotron resonance condition (ωcτk > 1) but also to induce a constructive interference between the neighboring double helices. The same effect is reflected in the S-shaped magnetization-magnetic field strength (M-H) curves superimposed with the linear background obtained by SQUID measurements, which leads to larger susceptibilities at 1000 G when compared with the values at 10,000 G. In particular, we propose that the spin-orbital coupling and Faraday's mutual inductive effect can be utilized to interpret the dimensional crossover of spin motions from quasi 1D in the hydrate state to 3D in the dry state of dsDNA.

Original languageEnglish
Pages (from-to)1233-1242
Number of pages10
JournalBulletin of the Korean Chemical Society
Volume29
Issue number6
Publication statusPublished - 2008 Jun 20

Fingerprint

Electron resonance
Magnetic resonance spectroscopy
Electron spectroscopy
SQUIDs
Magnetism
Hydration
Water content
DNA
Magnetic properties
Nucleotides
Cyclotron resonance
Molecules
Water
Magnetic variables measurement
Cyclotrons
Magnetic resonance
Hydrates
Magnetization
Momentum
Scattering

Keywords

  • Electron magnetic resonance
  • Hydration effect
  • Intrinsic magnetism
  • Natural DNA
  • SQUID

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Hydration effect on the intrinsic magnetism of natural deoxyribonucleic acid as studied by EMR spectroscopy and SQUID measurements. / Kwon, Young Wan; Chang, Hoon Lee; Do, Eui Doo; Choi, Dong Hoon; Jin, Jung Il; Jun, Sung Kang; Koh, Eui Kwan.

In: Bulletin of the Korean Chemical Society, Vol. 29, No. 6, 20.06.2008, p. 1233-1242.

Research output: Contribution to journalArticle

Kwon, Young Wan ; Chang, Hoon Lee ; Do, Eui Doo ; Choi, Dong Hoon ; Jin, Jung Il ; Jun, Sung Kang ; Koh, Eui Kwan. / Hydration effect on the intrinsic magnetism of natural deoxyribonucleic acid as studied by EMR spectroscopy and SQUID measurements. In: Bulletin of the Korean Chemical Society. 2008 ; Vol. 29, No. 6. pp. 1233-1242.
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