Development of Alditol Acetate Derivatives for the Determination of 15 N-Enriched Amino Sugars by Gas Chromatography-Combustion-Isotope Ratio Mass Spectrometry

Michaela Reay, Timothy Knowles, Davey Jones, Richard Evershed*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

2 Citations (Scopus)
94 Downloads (Pure)

Abstract

Amino sugars can be used as indices to evaluate the role of soil microorganisms in active nitrogen (N) cycling in soil. This paper details the assessment of the suitability of gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) for the analysis of 15 N-enriched amino sugars as alditol acetate derivatives prior to application of a novel 15 N stable isotope probing (SIP) approach to amino sugars. The efficient derivatization and cleanup of alditol acetate derivatives for GC was achieved using commercially available amino sugars, including glucosamine, mannosamine, galactosamine, and muramic acid, as laboratory standards. A VF-23ms stationary phase was found to produce optimal separations of all four compounds. The structure of the alditol acetate derivatives was confirmed using gas chromatography/mass spectrometry (GC/MS). For GC-C-IRMS determinations, implementation of a two-point normalization confirmed the optimal carrier gas flow rate to be 1.7 mL min -1 . Linearity of δ 15 N value determinations up to δ 15 N t of 469 ± 3.1‰ (where δ 15 N t is the independently measured δ 15 N value) was confirmed when 30 nmol N was injected on-column, with the direction of deviation from δ 15 N t at low sample amount dependent on the 15 N abundance of the analyte. Observed between- and within-run memory effects were significant (P < 0.007) when a highly enriched standard (469 ± 3.1‰) was run; therefore, analytical run order and variation in 15 N enrichment of analytes within the same sample must be considered. The investigated parameters have confirmed the isotopic robustness of alditol acetate derivatives of amino sugars for the GC-C-IRMS analysis of 15 N-enriched amino sugars in terms of linearity over an enrichment range (natural abundance to 469 ± 3.1‰) with on-column analyte amount over 30 nmol N.

Original languageEnglish
Pages (from-to)3397-3404
Number of pages8
JournalAnalytical Chemistry
Volume91
Issue number5
Early online date11 Feb 2019
DOIs
Publication statusPublished - 5 Mar 2019

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