δ13C and δD relationships among three n-alkyl compound classes (n-alkanoic acid, n-alkane and n-alkanol) of terrestrial higher plants

Yoshito Chikaraishi, Hiroshi Naraoka

Research output: Contribution to journalArticle

124 Citations (Scopus)

Abstract

Carbon (δ13C) and hydrogen (δD) isotopic compositions of long-chain n-alkanoic acids, n-alkanes and n-alkanols from plant leaves including C3 angiosperm, C3 gymnosperm, C4 and CAM plants were determined in order to clarify detailed isotopic relationships among the three classes of n-alkyl compounds in terrestrial higher plants. For all plant species, the three classes of n-alkyl compounds have a similar range of δ13C and δD values within a single species. However, most plants show a small but significant systematic difference in both δ13C and δD values with respect to biosynthetically corresponding carbon-numbered compounds. In general, n-alkane and n-alkanol are enriched in 13C (averaging 1.4 ± 1.1‰ and 1.3 ± 1.3‰, respectively) but depleted in D (25 ± 16‰ and 15 ± 12‰, respectively) relative to the corresponding carbon-numbered n-alkanoic acid. Moreover, the magnitude of the isotope difference is quite similar in all plants including different types of photosynthesis (C3, C4 and CAM). These results suggest that 13C- and D-discriminations occur at biosynthetic branching points during synthesis of n-alkanoic acid, n-alkane and n-alkanol from a common precursor, and that their fractionation mechanisms are common to all plant species. This systematic isotopic relationship between plant n-alkyl compounds will be useful to compare isotope records between different n-alkyl compounds in various geological samples.

Original languageEnglish
Pages (from-to)198-215
Number of pages18
JournalOrganic Geochemistry
Volume38
Issue number2
DOIs
Publication statusPublished - Feb 1 2007
Externally publishedYes

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Alkanes
Carboxylic acids
alkane
Carbon
Computer aided manufacturing
Isotopes
acid
Photosynthesis
Fractionation
Hydrogen
carbon
isotope
gymnosperm
Chemical analysis
angiosperm
alkyl compound
photosynthesis
isotopic composition
fractionation
hydrogen

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Cite this

δ13C and δD relationships among three n-alkyl compound classes (n-alkanoic acid, n-alkane and n-alkanol) of terrestrial higher plants. / Chikaraishi, Yoshito; Naraoka, Hiroshi.

In: Organic Geochemistry, Vol. 38, No. 2, 01.02.2007, p. 198-215.

Research output: Contribution to journalArticle

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