Rehydration of CTMA Modified DNA Powders Observed by NMR

• Authors: H. Harańczyk , J. Kobierski , D. Zalitacz , P. Nowak , A. Romanowicz , M. Marzec , J. Nizioł , E. Hebda , J. Pielichowski
• Languages of publication: EN

Abstracts

EN

The rehydration of salmon sperm deoxyribonucleic acid (DNA) and cetyltrimethylammonium chloride (C_{19}H_{42}ClN) complexes was observed using hydration kinetics, sorption isotherm, and high power proton relaxometry (at 30 MHz). The hydration kinetics shows (i) a very tightly bound water not removed by incubation over silica gel (A_0^{h} = 0.061 ± 0.004), (ii) a tightly bound water saturating at A_1^{h} = 0.039 ± 0.011, with the hydration time t_1^{h} = (1.04 ± 0.21) h, a loosely bound water fraction (iii) with the hydration time t_2^{h} = (19.1 ± 3.2) h and the contribution progressively increasing with the air humidity. For the hydration at p/p_0 = 100%, after t_0 = (152.6 ± 2.5) h of incubation the swelling process begins. The swelling time was t_3^{h} = (12.5 ± 5.4) h, and the swelling amplitude A_3^{h} = 0.140 ± 0.016. The sorption isotherm is sigmoidal in form and is fitted by the Dent model with the mass of water saturating primary binding sites Δ M/m_0 = 0.102 ± 0.021. Proton free induction decay is a superposition of the immobilized proton signal (Gaussian, with T_{2S}* ≈ 30 μs) and two liquid signal components coming from tightly bound (T_{2 L_1}* ≈ 100 μs) and loosely bound water fraction with the amplitude proportional to the mass of water added (T_{2 L_2}* ≈ 1000 μs).

Keywords

EN

82.56.Na

Discipline

• 82.56.Na: Relaxation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 2
• Pages: 485-490

Dates

published

2012-02

Contributors

author

H. Harańczyk

• Institute of Physics, Jagiellonian University, Kraków, Poland

author

J. Kobierski

• Institute of Physics, Jagiellonian University, Kraków, Poland

author

D. Zalitacz

• Institute of Physics, Jagiellonian University, Kraków, Poland

author

P. Nowak

• Institute of Physics, Jagiellonian University, Kraków, Poland

author

A. Romanowicz

• AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland

author

M. Marzec

• Institute of Physics, Jagiellonian University, Kraków, Poland

author

J. Nizioł

• AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland

author

E. Hebda

• Department of Chemistry and Technology of Polymers, Cracow Technical University, Kraków, Poland

author

J. Pielichowski

• Department of Chemistry and Technology of Polymers, Cracow Technical University, Kraków, Poland

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Identifiers

DOI

10.12693/APhysPolA.121.485