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2012 | 121 | 2 | 485-490
Article title

Rehydration of CTMA Modified DNA Powders Observed by NMR

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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).
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EN
Publisher

Year
Volume
121
Issue
2
Pages
485-490
Physical description
Dates
published
2012-02
Contributors
author
  • Institute of Physics, Jagiellonian University, Kraków, Poland
author
  • Institute of Physics, Jagiellonian University, Kraków, Poland
author
  • Institute of Physics, Jagiellonian University, Kraków, Poland
author
  • Institute of Physics, Jagiellonian University, Kraków, Poland
author
  • AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
author
  • Institute of Physics, Jagiellonian University, Kraków, Poland
author
  • AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
author
  • Department of Chemistry and Technology of Polymers, Cracow Technical University, Kraków, Poland
  • Department of Chemistry and Technology of Polymers, Cracow Technical University, Kraków, Poland
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv121n269kz
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