Quantification of deuterium isotopomers of tree-ring cellulose using nuclear magnetic resonance.

Betson, Tatiana R (author): Umeå universitet,Institutionen för medicinsk kemi och biofysik

Augusti, Angela (author): Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)

Schleucher, Jürgen (author): Umeå universitet,Institutionen för medicinsk kemi och biofysik

(creator_code:org_t)

2006-11-16
2006
English.
In: Analytical Chemistry. - : American Chemical Society (ACS). - 0003-2700 .- 1520-6882. ; 78:24, s. 8406-8411

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

Stable isotopes in tree rings are important tools for reconstruction of past climate. Deuterium (D) is of particular interest since it may contain climate signals and report on tree physiology. Measurements of the D/H ratio of tree-ring cellulose have proven difficult to interpret, presumably because the D/H ratio of the whole molecule blends the abundances of the seven D isotopomers of cellulose. Here we present a method to measure the abundance of the D isotopomers of tree-ring cellulose by nuclear magnetic resonance spectroscopy (NMR). The method transforms tree-ring cellulose into a glucose derivative that gives highly resolved, quantifiable deuterium NMR spectra. General guidelines for measurement of D isotopomers by NMR are described. The transformation was optimized for yield and did not alter the original D isotopomer abundances, thus, conserving the original signals recorded in wood cellulose. In the tree-ring samples tested, the abundances of D isotopomers varied by approximately ±10% (2% standard error). This large variability can only be caused by biochemistry processes and shows that more information is present in D isotopomer abundances, compared to the D/H ratio. Therefore, measurements of the D isotopomer distribution of tree rings may be used to obtain information on long-term adaptations to environmental changes and past climate change.

By the author/editor: Betson, Tatiana ...; Augusti, Angela; Schleucher, Jürg ...

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