Deep dehydration of Umbilicaria aprina thalli observed by proton NMR and sorption isotherm
Abstract The initial stages of Umbilicaria aprina Nyl. hydration (starting from the hydration level Δ m / m 0 = 0.048 ± 0.004) were observed using hydration kinetics, sorption isotherm and proton NMR. The thalli were hydrated from gaseous phase. The total saturation hydration level obtained at the r...
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crcambridgeupr:10.1017/s0954102008001363 2024-03-03T08:39:25+00:00 Deep dehydration of Umbilicaria aprina thalli observed by proton NMR and sorption isotherm Harańczyk, H. Bacior, M. Olech, M.A. 2008 http://dx.doi.org/10.1017/s0954102008001363 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102008001363 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 20, issue 6, page 527-535 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2008 crcambridgeupr https://doi.org/10.1017/s0954102008001363 2024-02-08T08:49:33Z Abstract The initial stages of Umbilicaria aprina Nyl. hydration (starting from the hydration level Δ m / m 0 = 0.048 ± 0.004) were observed using hydration kinetics, sorption isotherm and proton NMR. The thalli were hydrated from gaseous phase. The total saturation hydration level obtained at the relative humidity p/p 0 = 100% was Δ m/m 0 = 0.848 ± 0.009. The hydration courses revealed i) a fraction of very tightly bound water (Δ m/m 0 = 0.054 ± 0.011, short hydration time constant, t hyd ), ii) a fraction of tightly bound water [Δ m/m 0 = 0.051 ± 0.038, t hyd = (4.7 ± 2.6) h], and iii) a loosely bound water pool [t hyd = (31.0 ± 1.9) h] for higher values of target humidity. The sorption isotherm of U. aprina was fitted well using Dent model. The relative mass of water saturating primary binding sites was Δ M/m 0 = 0.054, which is close to the water fractions. Proton FIDs detected (i + ii) the immobilized tightly bound water fraction, L 1 , and iii) the mobile, loosely bound water pool L 2 . The hydration dependence of the proton liquid signal suggests the presence of a significant contribution from a water soluble solid fraction in the thallus. Sorption isotherm fitted to NMR data showed the absence of ‘sealed’ water fraction trapped in pores of the thallus. Article in Journal/Newspaper Antarctic Science Cambridge University Press Dent ENVELOPE(140.050,140.050,-66.649,-66.649) Antarctic Science 20 6 527 535 |
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Cambridge University Press |
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English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
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Geology Ecology, Evolution, Behavior and Systematics Oceanography Harańczyk, H. Bacior, M. Olech, M.A. Deep dehydration of Umbilicaria aprina thalli observed by proton NMR and sorption isotherm |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract The initial stages of Umbilicaria aprina Nyl. hydration (starting from the hydration level Δ m / m 0 = 0.048 ± 0.004) were observed using hydration kinetics, sorption isotherm and proton NMR. The thalli were hydrated from gaseous phase. The total saturation hydration level obtained at the relative humidity p/p 0 = 100% was Δ m/m 0 = 0.848 ± 0.009. The hydration courses revealed i) a fraction of very tightly bound water (Δ m/m 0 = 0.054 ± 0.011, short hydration time constant, t hyd ), ii) a fraction of tightly bound water [Δ m/m 0 = 0.051 ± 0.038, t hyd = (4.7 ± 2.6) h], and iii) a loosely bound water pool [t hyd = (31.0 ± 1.9) h] for higher values of target humidity. The sorption isotherm of U. aprina was fitted well using Dent model. The relative mass of water saturating primary binding sites was Δ M/m 0 = 0.054, which is close to the water fractions. Proton FIDs detected (i + ii) the immobilized tightly bound water fraction, L 1 , and iii) the mobile, loosely bound water pool L 2 . The hydration dependence of the proton liquid signal suggests the presence of a significant contribution from a water soluble solid fraction in the thallus. Sorption isotherm fitted to NMR data showed the absence of ‘sealed’ water fraction trapped in pores of the thallus. |
format |
Article in Journal/Newspaper |
author |
Harańczyk, H. Bacior, M. Olech, M.A. |
author_facet |
Harańczyk, H. Bacior, M. Olech, M.A. |
author_sort |
Harańczyk, H. |
title |
Deep dehydration of Umbilicaria aprina thalli observed by proton NMR and sorption isotherm |
title_short |
Deep dehydration of Umbilicaria aprina thalli observed by proton NMR and sorption isotherm |
title_full |
Deep dehydration of Umbilicaria aprina thalli observed by proton NMR and sorption isotherm |
title_fullStr |
Deep dehydration of Umbilicaria aprina thalli observed by proton NMR and sorption isotherm |
title_full_unstemmed |
Deep dehydration of Umbilicaria aprina thalli observed by proton NMR and sorption isotherm |
title_sort |
deep dehydration of umbilicaria aprina thalli observed by proton nmr and sorption isotherm |
publisher |
Cambridge University Press (CUP) |
publishDate |
2008 |
url |
http://dx.doi.org/10.1017/s0954102008001363 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102008001363 |
long_lat |
ENVELOPE(140.050,140.050,-66.649,-66.649) |
geographic |
Dent |
geographic_facet |
Dent |
genre |
Antarctic Science |
genre_facet |
Antarctic Science |
op_source |
Antarctic Science volume 20, issue 6, page 527-535 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102008001363 |
container_title |
Antarctic Science |
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20 |
container_issue |
6 |
container_start_page |
527 |
op_container_end_page |
535 |
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1792494943423430656 |